Merger control in United States

Arnold & Porter

Arnold & Porter remains a destination practice for high-stakes merger clearances, representing major clients such as AbbVie, AT&T, and Thermo Fisher in securing agency clearance for high-value deals, as well as handling government investigations, Second Request proceedings, and merger litigation. Alongside ongoing transactions such as Fitbit’s acquisition by Google, the firm has also secured new high-profile mandates, with practice co-head Debbie Feinstein representing Bertelsmann in its $2.2bn acquisition of Simon & Schuster, which is facing a Second Request by the FTC. Feinstein is vastly experienced in merger control, regularly advising on major successful clearances, and leads the team alongside Jonathan Gleklen , who combines merger expertise with a strong record in government investigations. The practice was further bolstered at senior level with the arrival of Andre Geverola from the DOJ, adding significant expertise in antitrust litigation and governmental issues. Michael Bernstein is a key name for contentious mergers and associated government investigations, while New York’s Scott Lent handles merger litigation for a variety of blue-chip clients. Associate Francesca Pisano is noted for her expertise in HSR filings and growing profile in large-scale merger clearances. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Debbie Feinstein; Jonathan Gleklen

Other key lawyers:

Andre Geverola

Key clients



AMC Entertainment


Bristol-Myers Squibb

Boston Scientific




Thermo Fisher

Work highlights

  • Representing Bertelsmann in its pending $2.175 billion acquisition of book publisher Simon & Schuster.
  • Advising Fitbit, Inc. on its $2.1 billion sale to Google.
  • Representing News Corp in its $349 million acquisition of the Books & Media segment of Houghton Mifflin Harcourt.

Cleary Gottlieb Steen & Hamilton

Cleary Gottlieb Steen & Hamilton remains a go-to for cross-border merger matters, advising a wide range of major US and multinational clients on multi-jurisdictional clearance proceedings, with extensive European expertise both within the firm’s US and global offices. as well as a notable capability in handling Chinese merger reviews. The team has a strong record in securing unconditional clearance for highly scrutinized mergers, including Google’s $2.1bn acquisition of Fitbit, as well as representing clients throughout contentious FTC and DOJ proceedings, including merger litigation. A deep senior bench includes a number of former DOJ and FTC officials, with George Cary and Mark Leddy both deeply experienced antitrust advisors with extensive records of government service. Bruce Hoffman is a highly-regarded global merger counsel who enjoys high-level relations with a wide range of global antitrust enforcers, while Brian Byrne  has particular expertise in cross-border European-domiciled matters, having previously worked at the firm’s Brussels office. Jeremy Calsyn  has a strong record in litigation, as does former Deputy Assistant Attorney General Dave Gelfand. Daniel Culley offers US and European expertise, and played a key role in the litigation for T-Mobile’s acquisition of Sprint, while Elaine Ewing  is a go-to merger counsel to multinational businesses, and Kenneth Reinker handles complex merger investigations and litigation. Mark Nelson departed for an in-house position. All named lawyers are primarily based in Washington DC.

Other key lawyers:

George Cary; Bruce Hoffman; Brian Byrne; David Gelfand; Elaine Ewing; Daniel Culley; Kenneth Reinker


‘Highly skilled in navigating through complex merger procedures, business minded, and excellent legal expertise’

Key clients

T-Mobile USA


Juul Labs, Inc.

Allied Universal Topco LLC

Molson Coors Beverage Company

Tech Data Corp

Fox Corp

Softbank Group

Work highlights

  • Represented T-Mobile and parent company Deutsche Telekom in its merger with Sprint Corporation for a combined enterprise value of $146 billion.
  • Represented Alstom in in obtaining merger clearance for its €15 billion combination with Siemens’ Mobility Business.
  • Represented Google in merger reviews conducted by the U.S. Department of Justice and the European Commission in its acquisition of Fitbit Inc. for $7.35 per share in cash, representing a total equity value of approximately $2.1 billion.

Latham & Watkins LLP

Latham & Watkins LLP combines an active domestic merger control practice, handling a large proportion of HSR filings, with a leading global platform, handling complex, multi-jurisdictional merger proceedings for blue-chip clients across a variety of industries. The firm has been active in the tech space, advising the likes of NVIDIA and AMD, while the highly-regarded Michael G. Egge  has continued his strong record, representing GRAIL in the FTC challenge to its $8bn acquisition by Illumina. The team’s cross-border expertise is considerable, with US-based practitioners working closely with the firm’s European and UK offices, regularly handling proceedings before the European Commission, CMA, and global antitrust regulators as well as FTC and DOJ challenges. Amanda Reeves  leads the team, and is known for her combination of global merger expertise and work on high-profile litigation relating to contested transactions, currently representing MGM throughout the global review of its acquisition by Amazon. San Francisco’s Kelly Fayne was promoted to partner in January 2021 in recognition of her growing profile in the market, playing an increasingly key role in major global deals including the MGM transaction and AMD’s purchase of Xilinx, while Farrell J. Malone is noted for his international expertise. Ian Conner joined the firm in March 2021, having previously served as Director of the Bureau of Competition at the FTC, further deepening the firm’s governmental expertise, while private equity-focused Katherine Rocco arrived from Kirkland & Ellis LLP in April 2022. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Amanda Reeves

Other key lawyers:

Michael G. Egge; Ian Conner; Kelly Fayne; Farrell J. Malone; Katherine Rocco

Key clients


MGM Holdings, Inc.

Advanced Micro Devices (AMD)

NVIDIA Corporation

Nestle USA, Inc.


Aon plc.


Siemens Healthineers AG

The Carlyle Group and Workforce LogIQ

Neenah Enterprises / GoldenTree Asset Management

United States Sugar Corporation




Skadden, Arps, Slate, Meagher & Flom LLP

The team at Skadden, Arps, Slate, Meagher & Flom LLP handles complex global approvals for mergers and joint ventures, with capabilities ranging from HSR filings and compliance issues, clearances proceedings before the DOJ and FTC, including investigations and formal challenges, and merger-related litigation before US and European courts. The firm, in collaboration with its global offices, is also adept in guiding cross-border deals through multi-jurisdictional merger control processes, having regularly dealt with cases before the European Commission and China’s MOFCOM. Areas of strength for the team include highly scrutinised sectors such as semiconductors, automotives, chemicals, pharma, with major deals closed in all these areas despite heavy regulatory oversight. Washington DC-based Steven Sunshine leads the team, with a strong record in high-value multijurisdictional merger clearances, alongside New York’s Clifford Aronson, who has also handled a wide range of merger reviews in key industries, alongside responding to government investigations.

Practice head(s):

Steven Sunshine; Clifford Aronson

Weil, Gotshal & Manges LLP

Weil, Gotshal & Manges LLP offers a destination merger and antitrust practice, working with top clients including Microsoft, Walgreens, and Johnson & Johnson on high-value strategic mergers, often bet-the-company deals with significant multijurisdictional elements and facing significant regulatory scrutiny. The team offers a deep and focused bench with significant in-house agency expertise, with practice head Steven Newborn a former head of the FTC Mergers I Division with a strong reputation in complex merger proceedings, while Jeffrey Perry , Steven Bernstein , and Michael Moiseyev also held senior FTC positions. The firm has capabilities in key industry sectors including energy, technology, and pharma, and also regularly works with many of the wider firm’s private equity clients on strategic buyouts. Brianne Kucerik continues to establish herself as a top-level practitioner, handling a number of major deals facing DOJ and FTC oversight, and notably cleared MGM’s purchase of The Cosmopolitan casino for $1.6bn, while John Scribner has a strong record in the pharma and tech sectors, regularly advising Sanofi on transactions. Jeff White has seen a prolific 2021, particularly on behalf of major private equity funds and portfolio companies in various industries, while Vadim Brusser  was promoted to partner in January 2021 and heads up the firm’s HSR and merger regulatory practice, handling all aspects of global pre-merger issues. All lawyers mentioned are in Washington DC.

Practice head(s):

Steven Newborn

Other key lawyers:

Jeffrey Perry; Mike Moiseyev; Steven Bernstein; Brianne Kucerik; Jeff White; John Scribner; Vadim Brusser


‘Incredibly knowledgeable and commercially savvy. Always able to distill a lot of information into business friendly advice.’

‘Steve Newborn – commercial, intelligent, thoughtful and pragmatic. Steve has seen it all and brings an enormous breadth of experience and perspective to every matter. A pleasure to work with.’

Key clients

BASF Corporation

Booking Holdings

Brookfield Asset Management

Charles River Laboratories


Johnson & Johnson

Kinder Morgan

Microsoft Corporation


The Sherwin-Williams Company

Walgreens Boots Alliance

Work highlights

  • Advised Microsoft in the antitrust aspects of its $7.5 billion acquisition of ZeniMax Media, Inc.
  • Represented Maxim Integrated Products, Inc. as its global antitrust counsel in the company’s $21 billion sale to Analog Devices, Inc. The transaction valued the combined enterprise at over $68 billion.
  • Advised Charles River Laboratories in the antitrust aspects of its approximately $875 million acquisition of Cognate BioServices, Inc. and in the antitrust aspects of its approximately $292.5 million acquisition of Vigene Biosciences.

Baker Botts L.L.P.

Baker Botts L.L.P. maintained its successful record across complex merger processes, including Second Request proceedings and litigation, working prolifically on behalf of clients in the private equity, tech, and industrials sectors. The team includes a number of former senior FTC and DOJ officials, and offers significant expertise in regulatory strategy and enforcement response, both within the US and when facing international antitrust agencies. The practice was further bolstered in 2021 with the arrival of former Antitrust Division Chief of Staff Taylor Owings, and the promotion of Jody Boudreault to partner, in recognition of her strong work in the healthcare sector. John Taladay oversees the team alongside former acting FTC Chair Maureen Ohlhausen, a vastly experienced antitrust practitioner with extensive first-hand knowledge of the merger review process. Mark Botti handles high-level cases in key sectors such as healthcare, financial services, and tech, including major litigation before the FTC and DOJ, while Paul Cuomo is a standout name for multi-jurisdictional merger processes, and regularly handles antitrust clearances for Liberty Media. Jeffrey Oliver also advises on global proceedings, and is strong in the oil and gas and heavy industrials spaces. Senior associate Matthew Adler is an emerging player in the team, co-ordinating complex clearance proceedings, including several cross-border deals for Liberty. All lawyers mentioned are in Washington DC.

Practice head(s):

John Taladay; Maureen Ohlhausen

Other key lawyers:

Mark Botti; Paul Cuomo; Jeffrey Oliver; Taylor Owings; Matthew Adler; Jody Boudreault


‘The firm has deep experience with our company and others. It takes into account our approach to risk. Very responsive. Practical and not academic. Coordinates complex projects and ensures timely filings – both HSR and responses to requests for information.’

‘ Quick and valuable advice from all. Paul Cuomo can advise on any competition issue with a worldwide view and pull in regional or subject matter expertise as needed.’

Key clients


American Industrial Partners, LLC (AIP, LLC)

A.O. Smith


Caterpillar Inc.

CenterPoint Energy


Conversant Wireless Licensing SARL

Eagle Materials



Georgia-Pacific LLC (GP Wood Products LLC)




HollyFrontier Corp

Irico Display Devices Co., Ltd.

JSW Steel (USA) Inc. / JSW Steel USA Ohio, Inc.

Koninklijke Philips N.V., Philips North America LLC, Philips Taiwan, Limited and Philips do Brasil Ltda.

Liberty Media Corporation

Magellan Midstream Partners LP

Masco Corporation

McDermott International, Inc.

National Association of Boards of Pharmacy

Olin Corporation


QVC, Inc.

Royal Dutch Shell


Sandoz, Inc.

SSW Partner LP

Sun Pharmaceuticals / Taro Pharmaceuticals

UnitedHealth Group Incorporated

Waste Management, Inc.

Westlake Chemical Corporation

Zydus Pharmaceutical, Inc.

Work highlights

  • Advising CenterPoint Energy in the $2.15 billion sale of its Arkansas and Oklahoma natural gas businesses to Summit Utilities, Inc.
  • Advising SSW Partners LP on the purchase of Veoneer Inc.
  • Representing AIP’s in all antitrust matters relating to its transactional pipeline.

Cravath, Swaine & Moore LLP

Cravath, Swaine & Moore LLP remains highly active in merger clearances, working in close collaboration with the firm’s dominant M&A practice on HSR filings, FTC and DOJ investigations, including Second Requests, and contentious merger review proceedings. The ‘results-oriented‘ team has seen success in several of its major ongoing transactions, including representing Mylan in its completed merger with Upjohn to form Viatris, and Illumina in its $8bn acquisition of GRAIL, and is also acting on major new transactions including Afterpay’s purchase by Square, and AerCap’s acquisition of GE Capital Aviation Services from General Electric. This reflects the firm’s broad blue-chip client base and capabilities in a range of highly scrutinised market sectors, including pharma, tech, and utilities. Practice head Christine Varney is former Assistant Attorney General at the DOJ Antitrust Division, offering vast expertise in review processes for high-stakes, multijurisdictional mergers, alongside a strong record in merger litigation. Maggie Segall continues to establish herself at the top table, playing a key role in the ongoing AerCap and Afterpay mandates, and is increasingly sought-after by major clients for complex and heavily scrutinised deals. All lawyers are in New York.

Practice head(s):

Christine Varney

Other key lawyers:

Maggie Segall; Richard Hall


‘Among the very best at steering a merger through the review process. They are sophisticated and keen advocates. And have a highly diverse team.’

‘Christine Varney is a board level, sophisticated antitrust attorney. She sees the full picture and helps clients through their toughest issues. Maggie Segal is truly one of the finest antitrust attorneys I’ve worked with.’

‘Excellent team, with the partner Richard Hall, very much on top on both the clients and his team.’

‘The Cravath team is unique in it’s ability to develop holistic, strategic, long-term relationships with clients. They truly get to know the business at a deeper level, which makes transactional work not only more effective and successful, but more efficient and economical.’

‘The individuals I work with at Cravath are an extension of my internal team. They are even providing value when they are not engaged in a specific transaction, either through keeping an eye out for great talent, advising on industry issues that may impact our business, or potential deals that may be of interest or may impact our strategy.’

‘Antitrust is an area where many claim to have expertise but only a few firms really shine. Cravath is one of those few.’

‘Christine Varney is a deep subject matter expert, long-time practitioner, and a force to be reckoned with. She is terrific with executive leadership and boards – a clear and confident communicator and strategist.’

Key clients

AmerisourceBergen Corporation

AerCap Holdings N.V.

Afterpay Limited

Centrica plc

GW Pharmaceuticals plc

Illumina, Inc.

International Business Machines Corporation (IBM)

Just Eat N.V.

National Grid plc

Swvl Inc.

Prosus N.V.

Scientific Games Corporation

Work highlights

  • Represented Mylan N.V. on antitrust issues in connection with its $50billion combination with Upjohn, Pfizer Inc.’s off-patent branded and generic established medicines business, to form Viatris Inc.
  • Representing AerCap Holdings N.V. on antitrust issues in connection with its pending $30 billion acquisition of GE Capital Aviation Services from General Electric.
  • Represented Illumina, Inc. on antitrust issues in connection with its $8 billion acquisition of GRAIL, Inc.

Davis Polk & Wardwell LLP

Davis Polk & Wardwell LLP works closely with its active corporate practice on antitrust clearances for US and cross-border transactions, acting for buyers, sellers and financial advisers in M&A and joint ventures merger processes, including complex multijurisdictional arrangements and investigations by the FTC and DOJ. The firm acts in a range of industries, including pharma, oil and gas, telecoms, and financial services, and has considerable in-house agency expertise, allowing the firm to respond to evolving regulatory scrutiny across key sectors. The practice is led by the highly experienced Arthur Burke, who remains active at the top of the market, recently advising Taboola on its merger with Outbrain, while senior practitioner Ronan Harty is also an authority on merger clearance issues, including large-scale strategic and cross-border arrangements. Howard Shelanski is another key name, and is advising IHS Markit on the large-scale merger with S&P Global, valued at $44bn, a deal that up-and-coming counsel Suzanne Munck af Rosenschold is also playing a key role in. All lawyers mentioned are in New York.

Jones Day

Jones Day has a standout global operation, combining a strong presence in multiple US commercial centres with its global platform, and regularly handling complex cross-border mergers, most notably closing Bombardier Transportation’s sale to Alstom in January 2021. The firm represents major companies in a number of industries including aerospace, heavy industrials, and tech, while also regularly advises on private equity-backed strategics, an emerging area in the market. The team handles HSR filings, FTC and DOJ investigations and review processes, and is also active in merger litigation, with standout practitioner Michael Knight part of a team representing Axon against the FTC’s challenge to its acquisition of VieVu. The US practice is led by Craig Waldman, an active merger counsel with standout involvements during 2021 in the tech, private equity, and transportation sectors, most notably working with the Duchossois Group on the sale of the Chamberlain Group to Blackstone for $5bn. The highly-praised Ryan Thomas has been active in complex merger proceedings in a variety of sectors, and Houston’s Bruce McDonald is noted for his expertise in energy, tech, and telecoms work, advising clients on government merger investigations and reviews. Kenneth Field remains a key name for healthcare work, with great knowledge of hospital mergers and FTC challenges, while Aimee DeFilippo led on Eaton’s successful acquisition by Danfoss. In San Francisco, former FTC official Lin Kahn specializes in investigations and litigation. Lawyers are in Washington DC unless otherwise stated. Paula Render  retired from the firm.

Practice head(s):

Craig Waldman

Other key lawyers:

Michael Knight; Ryan Thomas; Bruce McDonald; Kenneth Field; Aimee DeFilippo; Lin Kahn


‘They are very responsive, commercial and pragmatic.’

‘They work hard to understand our business and come up with commercial and pragmatic advice and solutions. Craig Waldman is a stand-out partner and is a pleasure to work with.’

‘Jones Day has an exceptional merger control team. Their broad global footprint and experience obviously helps, but it is their highly skilled and practical attorneys that sets them apart.’

‘The entire team is excellent, but I would particularly single out Ryan Thomas as exceptional. Not only does he have strong expertise in both the US and globally, but he is very pragmatic, and exceptional at coordinating and driving a broad, multi-faceted global regulatory process. Simply put, he gets things done, and done well!’

‘Deep experience in merger control involving global transactions. Extraordinary commitment to client service and perseverance to address challenges.’

‘Ryan Thomas was able to identify the key issues, explain them clearly, and define how they should be addressed to achieve our objectives.’

‘The team is helpful and practical. They keep me updated as needed and generally pick up the phone to explain an issue, sparing me the 3-page email exchanges that are so frustrating when you’re busy and trying to get a deal closed!’

Key clients

Avanti Markets, Inc.

Axon Enterprise, Inc.

Bombardier Inc..

Cleveland-Cliffs, Inc.

Conagra Brands, Inc.

Cooper Tire & Rubber Company

Eaton Corporation

Parker-Hannifin Corporation

Sanofi-Aventis U.S. LLC, Sanofi-Aventis Puerto Rico, Inc.

SHV Energy

The Duchossois Group, Inc.

The Riverside Company

Work highlights

  • Advised Eaton on the sale of its hydraulics business to Danfoss A/S for USD 3.3 billion.
  • Represented aerospace and rail equipment company Bombardier Inc. in the €7.45 billion sale of its Bombardier Transportation railroad rolling stock and signalling business to Alstom.
  • Advised Parker-Hannifin Corporation on its proposed $8.8 billion acquisition of Meggitt, plc, a leading provider of aerospace and defense motion and control technologies.

Kirkland & Ellis LLP

Kirkland & Ellis LLP is heavily active in merger clearances, successfully securing approvals for its highly acquisitive corporate and private equity clients, including such major funds as Blackstone, KKR, and Bain Capital, handling a large proportion of HSR filings alongside more contentious merger proceedings such as Second Requests and DOJ investigations. Alongside its strong domestic presence, the firm also regularly handles cross-border clearances, appearing before the European Commission and other global enforcers, and collaborating with its international offices on complex multijurisdictional matters. Key names in the team include the vastly experienced Matthew Reilly, a fixture in FTC and DOJ merger proceedings on behalf of a wide range of blue-chip clients and New York-based Ian John, who notably represented Ahold Delhaize in the clearance of its acquisition of Fresh Direct. Marin Boney has strong expertise in the software and technology space, handling approvals and investigations for M&A and joint ventures. The team expanded significantly during 2021, with Andrea Agathoklis Murino and Matthew Wheatley arriving from Goodwin in January and March respectively, Jill Ross joining the New York office from Dechert LLP in May, and media and entertainment specialist Scott Scheele arriving from the Antitrust Division in December. Lawyers are in Washington DC unless otherwise stated.

Other key lawyers:

Matthew Reilly; Ian John; Marin Boney; Andrea Agathoklis Murino; Matthew Wheatley; Jill Ross; Scott Scheele

Key clients

Ahold Delhaize

Ares Management Corporation

Bain Capital Private Equity

BC Partners-backed Intelsat

Blackstone Inc.

Clearlake Capital

E2open Parent Holdings, Inc.

Francisco Partners



Kinderhook Industries



Owl Rock Capital Group

Prince International

Radiology Partners


Tenet Healthcare

Vista Equity Partners

Paul, Weiss, Rifkind, Wharton & Garrison LLP

Paul, Weiss, Rifkind, Wharton & Garrison LLP remains active across a wide range of complex, high-value mergers, regularly securing clearance for big-ticket transactions in the face of FTC and DOJ scrutiny, as well as shepherding deals through multijurisdictional antitrust authorities. The firm’s expertise encompasses HSR filings and merger reviews, through to regulatory investigations and legal challenges, including associated litigation, with notably capabilities in the tech sector, which faces increasing regulatory scrutiny. The firm combines ‘hired gun’ mandates with regular transactional work for major market names including Elanco, Mastercard, and Apollo Global Management. The team includes a number of highly experienced antitrust practitioners with past DOJ and FTC experience, including former Principal Deputy Assistant Attorney General Andrew C. Finch, who co-leads the team and is an expert in merger reviews and investigations. Co-chair Aidan Synnott is a prolific merger counsel, and represented Conair in its sale by affiliates of American Securities LLC. All lawyers are based in New York unless otherwise stated. Washington DC-based Rick Rule left to found his own firm in March 2022.

Practice head(s):

Andrew C. Finch

Other key lawyers:

Aidan Synott

Simpson Thacher & Bartlett LLP

Simpson Thacher & Bartlett LLP is prolific in merger clearance work, handling a large pipeline of DOJ and FTC filings for corporate and private equity clients, with regular work on behalf of the likes of Blackstone, KKR, and Refinitiv, for whom the firm closed its sale to LSE Group for an estimated $27bn. Alongside its volume of work, the practice is also noted for its involvement in complex merger challenges and investigations, including multijurisdictional approvals processes, with a successful record in clearing Second Requests and other government investigations, as well as representing clients in merger litigation. The team is co-led from Washington DC by Sara Razi, a former senior FTC official with extensive knowledge of agency strategy, who advises on complex merger clearances and investigations in heavily scrutinised industries such as telecoms, media, and healthcare. New York’s Peter Guryan also heads up the team, and is noted for his work on challenging international merger clearances, recently representing TCF Bank in its $22bn merger with Huntington Bank, as well as leading on the Refinitiv deal. DC-based merger review specialist Preston Miller was promoted to partner in 2021, and offers extensive experience obtaining regulatory clearances from domestic and international competition authorities.

Practice head(s):

Peter Guryan; Sara Razi

Other key lawyers:

Preston Miller


‘The team worked together in a coordinated, efficient fashion across the several jurisdictions in which filings were made for our global transaction. They accurately anticipated the issues to be addressed and pro-actively prepared for and effectively addressed them. They also calibrated their engagement with the management team according to the management team’s preferences and were very effective in presentations to our board of directors.’

‘The Simpson Thacher lawyers on our matter were very capable and operated as a genuine team. Each had his own expertise but all knew the strategy and tactics involved across all of the jurisdictions in play so that our objectives could be achieved most effectively and efficiently.’

‘The depth of experience clearly makes this team valuable.’

‘I work primarily with Sara Razi. I appreciate that the depth of her experience along with her ability to quickly understand and access a transaction and break it down for the business team.’

‘The Simpson Thacher team is fantastic, having great strength in both the US and the EU. What sets the Simpson Thacher team apart is their ability to be both thorough and practical. They don’t look to make a mountain out of a mole hill. Rather, they tend to staff relatively lean and aim to get deep into the subject matter. They also are very pleasant to work with.’

‘Peter Guryan – it’s impossible to say too many positive things about Peter. He tends to lead on many of the transactions that raise the most challenging antitrust issues. He works extremely well and efficiently, managing his team in New York as well as coordinating global counsel. He is always calm and collected. Peter is extremely bright and business friendly. And finally, Peter is always available; he is highly responsive.

Sara has particular strength on media and technology matters. She is excellent to deal with – a really strong team player.’

Key clients


BorgWarner Inc.

Buckeye Partners, L.P.

Change Healthcare

CSL Limited

Dell Technologies

Ferro Corporation


L3Harris Technologies

ODP Corporation


Tradeweb Markets

Work highlights

  • Advising Refinitiv’s on its $27 billion acquisition by London Stock Exchange Group.
  • Representing Change Healthcare in its announced $13.8 billion acquisition by UnitedHealth Group.
  • Representing TCF Bank in its $22 billion merger with Huntington Bank.

White & Case LLP

White & Case LLP advises on a high volume of merger filings, with a particular specialism in multi-jurisdictional review proceedings, in line with the firm’s global M&A and private equity practices. The team is also adept in handling high-value and complex arrangements in a variety of sectors, such as energy, technology, and infrastructure, defending contested mergers against FTC and DOJ scrutiny, and has a strong record in SPAC deals, alongside a growing portfolio of major global tech clients. Practice head George Paul is a ‘top antitrust lawyer‘ and remains active on top-tier deals, representing Golden Nugget Online Gaming in its $1.56bn sale to DraftKings, as well as a regular counsel to the likes of Facebook and ExxonMobil. ‘Absolute starRebecca Farrington represents clients in government investigations and challenges, regularly defending proposed mergers against the FTC and DOJ, and was lead counsel to DIC and Sun Chemical on its purchase of BASF’s pigment business, which included regulatory approvals in 11 jurisdictions. Former FTC official Anna Kertesz specializes in merger investigations, and advised GlobalWafers on its $4.5bn acquisition of Silitronic, a major deal in the highly scrutinised semiconductor industry. Senior associate Heather Greenfield handles HSR filings, merger investigations, and judicial challenges, notably acting for Hertz in all HSR filings throughout its high-profile bankruptcy, while counsel Tamer Nagy remains a key name for Middle East-domiciled work. Senior associate Daniel Rosenthal played a key role on the BIC deal, and is a regular contributor to thought leadership on merger issues. All lawyers mentioned are in Washington DC.

Practice head(s):

George Paul

Other key lawyers:

Rebecca Farrington; Anna Kertesz; Heather Greenfield; Tamer Nagy; Daniel Rosenthal


‘Rebecca Farrington- smart, organized, easy to work with.’

‘Heather Greenfield-dedicated, sharp, calm.’

‘They are very proactive and have a large team so their time response is excellent.’

‘They are very focus on the issues and place deep attention to details. George Paul is a leader and knows very well how to discuss issues with authority. He is very convincing and his social skills helps him to get results other probably will not.’

‘The possibility to reach highly qualified lawyers by phone on a continuous basis to get a tailored and down-to-earth opinions is really appreciated.’

‘The team is professional and knowledgeable’

‘The team is very collaborative. I really feel like everyone on the team is an expert in their field, and I can trust them.’

‘The individuals on the team are one of a kind. In particular, Heather Greenfield is incredibly bright, and always find solutions to unique problems. She is detail-oriented and very quick to respond.’

Key clients

DIC & Sun Chemical


Golden Nugget Online Gaming, Inc.

GlobalWafers Co. Ltd

Smiths Group plc.

Exxon Mobil Corp.


Kobalt Music Group Ltd.

Avon Rubber

Novasep Process SAS

Grupo Verzatec

DP World




PQ Corporation

Azelis Americas

Work highlights

  • Represented DIC Corporation and Sun Chemical through its $1.15 billion acquisition of BASF’s global pigments business.
  • Representing Taiwan’s GlobalWafers Co., a global leader in semiconductor technology, as regulatory counsel, in its $4.5 billion acquisition of Germany’s Siltronic AG.
  • Representing Golden Nugget Online Gaming, Inc., a leading online gaming company on its $1.56 billion sale to DraftKings Inc.

Debevoise & Plimpton LLP

Debevoise & Plimpton LLP offers significant contentious expertise to its merger clients, handling HSR filings, government investigations, and merger litigation for a wide range of corporates and private equity funds. The practice is adept in shepherding strategic acquisitions, PE-backed buyouts, and joint ventures through FTC and DOJ scrutiny, and enjoys productive relationships with regulatory agencies in the US and beyond. Areas of expertise for the firm include financial services, consumer products, technology, and manufacturing, with standout clearances in 2021 including Cornerstone’s $1bn sale of its IMP business to Nucor Insulated Panel Group, led by practice co-head Michael Schaper  in New York. Washington DC-based Ted Hassi also co-leads the team, and is active on behalf of top clients including Toyota and Verizon, particularly in merger litigation. New York’s Erica Weisgerber is active in merger control work, with specialism in pre-merger coordination, while DC-based senior associate Leah Martin is also a key contributor, acting for clients such as Toyota and CD&R.

Practice head(s):

Michael Schaper; Ted Hassi

Other key lawyers:

Erica Weisberger; Leah Martin

Key clients

Peabody Energy Corporation

Arcesium LLC

Clayton Dubilier & Rice and Portfolio Companies

Toyota Motor Sales, U.S.A. and Toyota Canada, Inc.

Armando Kellum

GoDaddy, Inc.

Gogo, Inc.

DBS Bank Ltd.

The Bank of Yokohama Ltd

Ardagh Group

Discovery Communications

Schneider Electric

TPG Capital

Cornerstone Building Brands

Domtar Corporation

Assurant Inc.

Massachusetts Mutual Life Insurance Company


The Jockey Club

Albertsons Companies, Inc.


Great American Outdoors Sports Group

TPG Capital, Welsh Carson Anderson & Stowe and Kindred Healthcare LifePoint

Artera Services


Dechert LLP

Dechert LLP advises clients throughout complex merger review processes, including FTC and DOJ challenges and consent orders, as well as representing in merger litigation. Alongside its existing strength in healthcare, the firm also regularly advises clients in retail, energy, and private equity, as well as handling cross-border merger proceedings in collaboration with its global platform. Former FTC assistant director Mike Cowie specializes in government investigations and challenges in the health care and life sciences space, and now co-heads the team alongside Philadelphia-based Steven Bizar. James A Fishkin handles reviews and merger litigation, and is particularly strong in the retail sector, while up-and-coming Rani Habash advises clients throughout pre-merger risk assessments, negotiations with counterparties, and DOJ and FTC investigations, with notable clients including CVS Health and Aetna. Counsel Gregory Luib is also noted for his representation of clients in FTC and DOJ merger investigations. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Steven Bizar; Mike Cowie

Other key lawyers:

James A Fishkin; Rani Habash; Gregory Luib

Key clients

CVS Health

Court Square Capital/Getaroom

DTE Energy

Henry Crown, Inc.

Jacksons Foods Stores

One Equity Partners

Work highlights

  • Advised Jacksons Food Stores on its purchase of 63 fuel outlets and convenience stores required as part of a FTC consent decree resolving competitive concerns related to 7-Eleven, Inc.’s $21 billion acquisition of Speedway from Marathon Petroleum Corp.
  • Advising Court Square Capital Partners on its sale of Getaroom, a leading B2B hotel accommodations distributor, to Booking Holdings, the parent company of Priceline, Kayak, and other travel brands.
  • Representing Ritchie Bros. Auctioneers in its agreement to acquire Euro Auctions, a provider of heavy equipment auctions with onsite and online bidding under the brands Euro Auctions and Yoder & Frey globally.

Freshfields Bruckhaus Deringer LLP

Freshfields Bruckhaus Deringer LLP continues to develop its profile within the US merger control market, working with its active West Coast and New York-based M&A teams, alongside its global antitrust offering, on a wide range of major global deals, most notably advising LSE on the final approval of its $27bn acquisition of Refinitiv. The team is also strong on domestic deals, working with major clients including Cargill and Verizon on merger control filings, and supporting them through government investigations and regulatory reviews of transactions, as well as conducting risk assessments for non-public transactions. The team offers a number of former DOJ and FTC officials, with practice head Julie Elmer a former DOJ prosecutor, while Mary Lehner has counseled two FTC Chairs, and played a key role in the unconditional approval of AstraZeneca’s $39 billion acquisition of Alexion. Meghan Rissmiller is a prolific merger control counsel, currently working with Aerojet Rocketdyne on its sale to Lockheed Martin, while counsel Jan Rybnicek is noted for his strategic advice on the antitrust implications of proposed mergers. All lawyers mentioned are in Washington DC.

Practice head(s):

Julie Elmer

Other key lawyers:

Mary Lehner; Meghan Rissmiller; Jan Rybincek; Justin Stewart-Teitelbaum


‘A very strong team in the US which is seamlessly integrated into Freshfield’s leading international practice makes this the “go-to” choice for complex international transactions.’

‘With Meghan Rissmiller, Freshfields has added impressive talent to an already outstanding team of rising professionals, including Justin Stewart-Teitelbaum.’

‘Highly strategic team with also very strong technical skills.’

‘Mary Lehner is a highly strategic antitrust lawyer that thinks through creative ways to get the deal done.’

‘Our experience with Freshfields showed a lot of hands on experience with the matter we were dealing with along with an understanding of the practical business concerns. They worked well with our local firm to manage costs and divisions of labor.’

‘Justin Stewart-Teitelbaum was highly knowledgeable about antitrust legal matters as well as the processes and procedures of government agencies overseeing these areas. His previous experience within the federal government was invaluable. In addition, his soft skills and clear communications were helpful with outside parties and our internal stakeholders.’

‘Mary Lehner is knowledgeable and responsive. She also has good knowledge of how the agencies in Washington work.’

‘The team has a lot of practical experience from within FTC/DOJ and is able to advise on likely approach from the government institutions. They have a really deep knowledge of our business and are commercial in their outlook.’

Key clients




Johnson & Johnson

United Airlines

Verizon Communications

Aerojet Rocketdyne








Work highlights

  • Advised AstraZeneca on its $39 billion acquisition of Alexion Pharmaceuticals, Inc.
  • Advised LSEG on its US$27 billion acquisition of Refinitiv.
  • Advised Verizon on the global antitrust and foreign investment aspects of the $5 billion sale of Verizon Media Group to Apollo Global Management.

Fried, Frank, Harris, Shriver & Jacobson LLP

The team at Fried, Frank, Harris, Shriver & Jacobson LLP focuses on securing clearance for business-critical, often global deals facing significant regulatory scrutiny, including FTC Second Requests, DOJ oversight, and formal legal challenges, with a successful record in successfully closing deals without facing litigation. Led by former Deputy Assistant Attorney General Barry Nigro, who divides his time between New York and Washington DC, the team is adept in handling the rapidly shifting regulatory landscape, including changes to both horizontal and vertical merger guidelines, best reflected in its ongoing representation of ProQuest in the FTC Second Request to its acquisition by Clarivate, issued following the change in leadership at the FTC under the Biden administration. Nathaniel Asker is another key name within the team, handling FTC and DOJ oversight of high-value deals for clients such as CVC Capital Partners, for whom he secured clearance for their $640m sale of Kount to Equifax, and Blackrock. Senior counsel Aleksandr Livshits continues to bolster his growing reputation within the space, handling complex cross-border merger investigations and representing a diverse range of corporate clients before antitrust authorities. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Barry Nigro

Other key lawyers:

Nathaniel Asker; Aleksandr Livshits


‘Barry Nigro is fabulous.’

‘No one compares to Barry Nigro in terms of goodwill and getting the benefit of the doubt at the enforcement authorities. He’s also a top analyst that figures out quickly what’s important and focuses energies there.’

‘The firm is well qualified to handle any aspect of the array of issues that may arise in the antitrust field. The firm communicates well about topics as they arise and the years of experience shows in the advice and long range perspective provided.’

‘Barry Nigro’s years of experience make his counsel and perspective, particularly seeing what is coming down the road, exceptional.’

‘Offer practical advice and solutions and are very humble and client-focused. Understand our business and our objectives and provide solutions to achieve them.’

Key clients



Novelis Corporation



Landmark Media Enterprises

Jacobs Engineering

Goldman Sachs


AEA Investors


Sinclair Broadcast Group, Inc.

Becton, Dickinson and Company (new client to practice)

Jacob Holm

Blue Yonder

Constellation Affiliated Partners / RedBird Capital Partners

Extended Stay America

Mettler-Toledo International Inc.

Work highlights

  • Advised ProQuest in its pending $5.3 billion acquisition by Clarivate plc.
  • Advised Permira in its acquisition of McAfee Corp., as a member of a consortium that includes Advent International Corporation, Crosspoint Capital partners, Canada Pension Plan Investment Board, GIC Private Limited, and a wholly owned subsidiary of the Abu Dhabi Investment Authority, valued at more than $14 billion.
  • Advised Blue Yonder and selling shareholders New Mountain Capital and Blackstone in the $8.5 billion sale of Blue Yonder to Panasonic Corporation.

Gibson, Dunn & Crutcher LLP

Gibson, Dunn & Crutcher LLP represents clients in a broad range of merger control cases, handling merger filings and clearance proceedings through to DOJ and FTC investigations and legal challenges, as well as representing in merger litigation brought by state authorities. The practice has notable strength in media and entertainment, and is also active in other sectors including energy, pharma, and technology, as well as regularly working on behalf of private equity clients in merger proceedings. A notable win for the team during 2021 was winning DOJ approval for Stone Canyon’s acquisition of Morton Salt for $3.2bn, following a lengthy investigation, a matter led by standout performer Adam Di Vincenzo. The practice is led by San Francisco-based Rachel Brass alongside Stephen Weissman, with both highly experienced in representing clients before the FTC and DOJ in high-stakes merger investigations, as well as in litigation. Los Angeles’ Daniel Swanson is a key name, enjoying productive relationships with top clients including Apple and Panasonic, as well as regularly handling cross-border cases before the European Commission, while Scott Hammond has a strong record in the financial services sector. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Rachel Brass; Stephen Weissman

Other key lawyers:

Adam Di Vincenzo; Scott Hammond; Daniel Swanson

Key clients





Merck & Co., Inc.

Jimmy John’s

Barnes & Noble Education, Barnes & Noble College Booksellers

Kraft and Mondelez

Smithfield Foods



Goodwin updated its practice with the April 2021 arrival of practice co-heads Andrew Lacy and Arman Oruc from Simpson Thacher & Bartlett LLP and an in-house position respectively, based out of the firm’s Washington DC and Los Angeles offices. This bolsters a team that combines a prolific record in HSR filings and merger review processes for M&A and private equity investments with a strong record in more contentious merger clearances, including DOJ challenges and most notably FTC Second Requests. The firm retains a strong specialism in tech and life sciences deals, with standout involvements during 2021 including its role as a co-counsel to Slack in its $27.7bn sale to Salesforce, and its representation of Nimbus Therapeutics in Second Request proceedings. DC’s Paul Jin  is another key name in the team, handling a wide range of transactions, alongside risk advisory work and support in contentious merger proceedings. Also in DC, Kara Kuritz specialized in HSR filings in a previous role at the DOJ, and continues to advise clients on notifications, both pre-merger and throughout the process.

Practice head(s):

Andrew Lacy; Arman Oruc

Other key lawyers:

Paul Jin; Kara Kuritz


‘Arman Oruc is a first class antitrust lawyer, who clearly stood above the army of other antitrust attorneys involved in our transaction. He is measured in his communication, has a strong understanding of the big picture, logically designs and articulates his case, and can go deep into the clinical science to support his legal case.’

Key clients



KIND North America

Nimbus Therapeutics

Slack Technologies

TA Associates

Trillium Therapeutics Inc.

Virtusa Corporation


Work highlights

  • Representing life sciences company Nimbus Therapeutics in a multi-faceted antitrust matter involving both a Second Request issued by the Federal Trade Commission and the related antitrust litigation in the Southern District of New York against Bristol-Myers Squibb (BMS) and Celgene Corp.
  • Advised Slack in its $27.7 billion sale to Salesforce.
  • Advising Trillium Therapeutics in its definitive agreement under which Pfizer will acquire Trillium.

Hogan Lovells US LLP

Hogan Lovells US LLP leverages its global platform, advising on major global merger clearances, including multijurisdictional filings and complex US merger review proceedings, including FTC Second Requests and DOJ challenges. The team has standout capabilities in the TMT and life sciences space, with key clients including IBM and UnitedHealth, with a standout involvement being its representation of IBM in the multijurisdictional approval of its acquisition of Red Hat. In line with its sector expertise, the team regularly handles mergers with significant intellectual property elements, with practice head Logan Breed  a regular contributor to thought leadership on the intersection between IP and antitrust issues, while also remaining active in large-scale merger review processes for top tech and life sciences clients. Other key names in the team include life sciences specialist Leigh Oliver, who took the lead on Albert Einstein’s merger with Thomas Jefferson University, defending the transaction against an FTC injunction, and Robert Leibenluft , who formerly headed the FTC Health Care Division and focuses heavily on the space. The practice can also call upon the vast experience of former FTC Chairwoman Edith Ramirez, whose areas of strength include cybersecurity and Second Request proceedings. All lawyers mentioned are in Washington DC.

Practice head(s):

Logan Breed

Other key lawyers:

Leigh Oliver; Robert Leibenluft; Edith Ramirez


This team is proactive, hands on and as expert as any team that I have ever worked with in the past. They are creative in their solutioning of situations and leverage their vast expertise on a global basis to enable the client to engage constructively. I also appreciate that they staff appropriately and thoughtfully and are readily available to provide timely advice. This is truly a stellar team.’

‘Logan Breed is top notch – he is a consummate professional and exceptionally knowledgeable in this field.’

‘The firm helped us with an on-again off-again merger that required FTC approval and the Hogan Lovells team seamlessly picked up our file each time with no loss (or very little loss) of momentum upon each iteration of the deal. For perspective, this deal took years not weeks or months and the Hogan Lovells team remained mostly constant throughout, which was a benefit to us and a credit to the firm.’

‘The Hogan Lovells lawyers were often asked by our management team to make predictions as to how the FTC would react to the filings made (in terms of timing for an FTC response as well as the substance of an FTC response) and the Hogan Lovells’ predictions rang true in almost all circumstances. Given the dependability of their advice, we were able to make accurate and informed business decisions that helped our deal gain FTC approval and later proceed to closing.’

Key clients

PPG Industries Inc.


UnitedHealth Group

Tops Market


Albert Einstein Health System




Work highlights

  • Advising Kustomer, a CRM software SaaS provider, on the cross-jurisdictional regulatory aspects of its $1bn acquisition by Facebook.
  • Advised Albert Einstein Health Network in the successful defense of its merger with Thomas Jefferson University from preliminary injunction challenge by the FTC.
  • Advising UnitedHealth Group on the planned $13bn merger of its Optum division with Change Healthcare.

Linklaters LLP

With strength in the pharma, healthcare, and financial services sectors, the team at Linklaters LLP is adept in handling sensitive merger reviews, particularly for pharma clients including Novartis, Takeda, and Bayer, including regulatory investigations of deals through to related litigation. The firm also shows great strength in cross-border merger reviews, working closely with its international teams to secure clearance from European and other key antitrust regulators. This capability was demonstrated by the firm’s successful representation of Grandvision in its takeover by EssilorLuxottica, which was ultimately cleared after investigations by US and EU authorities, as well as several countries in Latin America and Asia. Practice head Tom McGrath led the team on that matter, and remains a strong choice for global merger clearances, especially within the healthcare industry. Douglas Tween is an accomplished litigator and handles enforcement proceedings, while Antonia Sherman continues to bolster her profile within the merger space, handling HSR filings as well as multijurisdictional merger processes, particularly within Latin America. John Eichlin focuses on advising clients on antitrust and foreign investment issues for cross-border mergers. All lawyers mentioned are in New York.

Practice head(s):

Tom McGrath

Other key lawyers:

Douglas Tween; Antonia Sherman; John Eichlin


Linklaters has a fantastic merger control team spanning the globe that is able to provide timely, practical and informed advice across all jurisdictions in a seamless manner. They work extremely effectively as a team to deliver concise and thoughtful global advice and clients benefit from the fact that they are very well informed on market practice across all jurisdictions.’

‘Antonia Sherman is a standout on a fantastic team – she is smart, wonderful to deal with, highly responsive and practical. She has a wealth of knowledge on this subject and is able to leverage her colleagues’ expertise in jurisdictions globally. She is an invaluable advisor to our team.’

‘They are knowledgeable and hard working.’

Key clients

Qiagen N.V.


Société Générale ; SG Americas Securities, LLC

Covestro AG

G4S plc

Strides Pharma Inc.

Kelkoo Group

Bayer AG

Qatar Investment Authority (“QIA”)

Dialog Semiconductor plc




Tate & Lyle

Work highlights

  • Advised GrandVision in EssilorLuxottica’s $8.5bn high-profile takeover creating a leading global eyecare and eyewear company.
  • Avised Bayer AG on the $7.6bn sale of its worldwide animal health business to Elanco Animal Health.
  • Representing generic pharma manufacturer Strides Pharma, Inc. in connection with a series of actions consolidated under the In Re Generic Pharmaceuticals Pricing Antitrust Litigation.

McDermott Will & Emery LLP

McDermott Will & Emery LLP has long-standing strength in the healthcare antitrust space, handling numerous hospital mergers alongside clearances for other deals in the sector, combining this with merger control advice in a wide range of other sectors, with the team often brought in to specifically handle antitrust elements of deals, including standard filings through to merger challenges and litigation against the DOJ and FTC. The firm also handles merger arbitrage matters, working with hedge funds and other investor clients to identify potential transactions that will survive regulatory oversight. A notable representation during 2021 was that of Constellation Brands in its sale of 34 wine and spirit brands to EJ Gallo, for an estimated $1.7bn, a transaction facing an FTC Second Request and ongoing remedy negotiations. The team is led by Raymond Jacobsen, who has a strong record in defending complex mergers, and is currently representing Lockheed Martin in its proposed acquisition of Aerodyne. Joel Grosberg is also active in the merger space, handling clearance applications and litigation for deals in a wide range of sectors, including technology, chemicals, and life sciences. Katharine O’Connor in Chicago focuses her practice on merger defense, representing clients before regulatory agencies, judges, and juries. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Raymond Jacobsen

Other key lawyers:

Joel Grosberg; Katharine O’Connor

Key clients

Allscripts Healthcare Solutions, Inc.

Constellation Brands

Amneal / Impax Laboratories

Lockheed Martin

Premier Inc.


NGK Insulators, Inc.

Treehouse Foods, Inc.

Ballad Health

Main Line Health


Baxter Healthcare

Southern Illinois Healthcare

Permanente Medical Group

Allscripts Healthcare Solutions, Inc.

TreeHouse Foods, Inc.

Geisinger Health

Lake Health

Cedars Sinai Health System

US Anesthesia Partners

Motorola Mobility LLC

Honey Bum

Work highlights

  • Represented Constellation Brands in E&J Gallo’s $1.7B acquisition of 34 wine and spirit brands from Constellation.
  • Representing Lockheed Martin in connection with its $5 billion acquisition of Aerojet Rocketdyne.
  • Represented TreeHouse Foods as buyer in the purchase of the majority of pasta brands from Spanish corporation Ebro’s Riviana Foods.

Morgan, Lewis & Bockius LLP

Morgan, Lewis & Bockius LLP is known for its expertise in HSR filings, prolifically advising clients, including private equity investors and corporates, on notifications and HSR-related issues, as well as regularly filing merger notifications in non-US jurisdictions on behalf of notable international clients including Pfizer. The team is also known for its broader work on the HSR Act, working with the FTC on rule changes, particularly within the pharma sector. The antitrust practice works both in tandem with its corporate and private equity teams on approving the firm’s pipeline of deals, as well as regularly being instructed as specialist antitrust counsel for complex multijurisdictional transactions. The practice is led by New York-based Harry Robins , who focuses on securing clearance before the FTC and DOJ for corporate and private equity transactions and joint ventures, and is an authority on premerger notification issues. Washington DC’s Jonathan Rich defends mergers before US and international antitrust authorities, with expertise in a variety of industry sectors, while New York’s David Brenneman is an active HSR advisor, and counsels clients on agency strategy. DC-based Ryan Kantor has a strong focus on the healthcare sector.

Practice head(s):

Harry Robins

Other key lawyers:

Jonathan Rich; David Brenneman; Ryan Kantor

Key clients

Digital Colony Partners

EQT Partners


Hitachi Metals

Intercontinental Exchange

Merck & Co. Inc.

Perrigo Company plc

Pfizer Inc.

Platinum Equity


Realogy Holdings, Inc.

Rite Aid

Securus Technologies Inc.

Sun Capital Partners Inc.

Takeda Pharmaceutical

Teleflex Incorporated

Zoetis Inc.

Work highlights

  • Advised Pfizer in the combination of Pfizer’s Upjohn Business and Mylan N.V. to form Viatris.
  • Advised Intercontinental Exchange Inc. in the acquisition Ellie Mae from private equity firm Thoma Bravo L.P.

Morrison Foerster

Morrison Foerster has continued to grow its profile in merger work on both coasts, combining its longstanding strength in tech sector deals with growing involvement in other highly-scrutinised sectors, including labour markets, energy, and pharma. The team welcomed Alex Okuliar as co-chair in March 2021, who arrived after serving as Deputy Assistant Attorney General for Civil Enforcement in the DOJ, and brings significant expertise in regulatory reviews of transactions by both the DOJ and FTC, currently representing ShowingTime in the Second Request relating to its purchase by Zillow, alongside up-and-coming partner Megan Gerking. Co-chair Jeff Jaeckel combines merger control advice with strong capabilities in contentious work, regularly representing public and private companies in merger-related litigation, and is continuing to represent SoftBank and Arm in Arm’s $40bn purchase by Nvidia. David Shaw is another recent addition to the team, arriving from the Antitrust Division in January 2021, and offering notable expertise in state attorney general investigations of transactions, as well as federal merger investigations. Vishal Mehta is noted for his work on digital platforms, and has represented a wide range of clients in FTC and DOJ merger proceedings. All lawyers mentioned are in Washington DC.

Practice head(s):

Jeff Jaeckel; Alex Okuliar

Other key lawyers:

Megan Gerking; Vishal Mehta; Mary Kaiser


The team is responsive and creative. We have had a long relationship with the Mofo team, and this has built a lot of trust as well as a lot of understanding. They have a good sense of the business’s goals and preferences, and this puts the team in an excellent position to be a partner in creative problem solving as well as issue spotting.’

‘Jeff Jaeckel and Mary Kaiser both know our company well, and go out of their way to make themselves available to talk through any antitrust issue we might face or question we might have, whether it is big or small. They make great sounding boards, and excellent partners in creative problem solving.’

‘Knows our firm very well. Is able to give excellent advice based on industry knowledge and our objectives.’

‘Jeff Jaeckel is irreplaceable. Excellent technical knowledge, superb judgment, and ability to quickly get under the hood of a new industry to understand market dynamics.’

‘The MoFo team is incredibly responsive, practical and agile. The team is impressively strong in the areas of media, entertainment and technology.’

‘I always get a response from MoFo within minutes of reaching out, weekdays and weekends. As a General Counsel, the comfort in knowing that someone is “on it” is priceless, helping me to manage by CEO, Board and other internal stakeholders. The lawyers are upbeat, friendly and great oral and written communicators.’

‘The team provides very practical advice, is extremely efficient and responsive.’

‘Jeff Jaeckel is an incredible resource. He is incredibly knowledgeable, but also provides very practical advice and is an excellent communicator.’

Key clients

Arm Limited

Axalta Coating Systems



DSP Group, Inc.

Ethos Capital

Kindred Biosciences

Kyowa Kirin Co., Ltd.


Santen Pharmaceutical Co.




Southwest Gas


Work highlights

  • Represented, Inc., a leading property technology company for the residential real estate industry, in its $500 million acquisition by Zillow Group, Inc.
  • Representing SoftBank Group Corp., SoftBank Vision Fund, and Arm Ltd. in the $40 billion sale of Arm to U.S. chip company NVIDIA.
  • Representing Southwest Gas in connection with its proposed acquisition of Quester Pipeline for approximately $2 billion and Carl Icahn’s unsolicited tender offer to acquire 100% of the outstanding shares of Southwest Gas for approximately $4.2 billion.

Shearman & Sterling LLP

Shearman & Sterling LLP handles high-stakes mergers for clients in a number of industries, with notable capabilities in the technology, media & entertainment, chemicals, and minerals sectors, among others. The firm has integrated expertise across merger filings, investigations, and litigation, and also works with clients on regulatory analyses before mergers are put before antitrust authorities. Alongside in-house DOJ and FTC expertise across its bench, the firm also engages regularly with European and UK competition bodies, allowing it to handle cross-border proceedings effectively. The practice is overseen by New York’s Jessica Delbaum, whose work encompasses HSR compliance and filings through to international merger defense proceedings before the DOJ and FTC, alongside Washington DC-based David Higbee, a former high-level DOJ official with strong expertise across government investigations, merger reviews and civil litigation matters for clients in a diverse range of sectors. ‘Persuasive advocate’ Ben Gris was formerly Assistant Director of Trade and Competition at the FTC, and is noted for his focus on merger investigations and litigation.

Practice head(s):

Jessica Delbaum; David Higbee

Other key lawyers:

Ben Gris


‘The team goes to great lengths to really understand the client, the issues, and provide fulsome advice that is grounded and practical.’

‘David Higbee and his team are great partners who make themselves available to their clients. They have a great bedside manner that makes them really effective counsel.’

‘They are very smart, experienced, responsive, pragmatic and they are strong advocates before they are regulators.’

‘Ben Gris’s experience gained from spending many years as a regulator at the FTC allows him to provide an invaluable perspective. He is always thinking several steps ahead. He’s a brilliant strategist and a persuasive advocate.’

Key clients





Texas Instruments Incorporated



Glatfelter Corporation


Work highlights

  • Representing JetBlue Airways Corp in connection with its entry into a strategic alliance with American Airlines Group.
  • Representing ViacomCBS in the defense of the sale of Simon & Schuster to Penguin Random House in the face of a Second Request and a DOJ suit to block the transaction.
  • Represented Bunge Limited in the Second Request investigation of its sale of 35 U.S. interior elevators to Zen-Noh Grain Corporation.

Vinson & Elkins LLP

Vinson & Elkins LLP bases its global merger practice out of Washington DC and has a prolific record in HSR filings, as well as handling merger reviews and investigatory processes before the FTC, DOJ, and international competition regulators. The team also has a considerable presence in Texas and California, and marries the firm’s traditional strength in the energy sector with a growing record in tech sector work, evidenced by the firm’s successful clearance of Google’s acquisition of Fitbit. Elsewhere, the firm has continued to work on behalf of major international names such as Hitachi alongside top energy clients such as Chevron, Noble Energy, and Parsley, for whom the firm advised on its sale to Pioneer Natural Resources. Darren Tucker leads the team, bringing in-house FTC experise to merger clearance proceedings for deals in the technology, energy and pharma sectors, leading on the unconditional Google-Fitbit clearance while Hill Wellford specializes in government investigations and HSR filings. Counsel David Smith‘s expertise includes international merger reviews and associated litigation, as well as advising on intellectual property elements of contested mergers. All lawyers mentioned are in Washington DC.

Practice head(s):

Darren Tucker

Other key lawyers:

Hill Wellford; David Smith

Key clients

AirTran Airways

HeartBrand Holdings, Inc.


Huntsman International

Phadia US Inc.

Southwest Airlines, Inc.

Magellan Crude Oil Pipeline Company, L.P.

AK Steel Corporation, et. Al – railroad MDL

Google LLC


Wanhua Chemical (America) Co., Ltd.


Calumet Specialty Products

Maxell, Ltd. And Maxell Corporation of America


Switchback II Corporation

Enable Midstream Partners, LP

Group 1 Automotive, Inc.

ioneer Lrd.

The Sinclair Companies

Liberty Oilfield Services Inc.


Direct Energy

Noble Energy, Inc.

Plains All American

Chevron Phillips Chemical Co.

Vida Capital, Inc.

Work highlights

  • Represented Google in its $2.1 billion acquisition of Fitbit, Inc.
  • Advised Noble Energy, Inc. in a definitive agreement with Chevron Corporation under which Chevron will acquire all of the outstanding shares of Noble Energy in an all-stock transaction valued at $13 billion.
  • Represented Parsley Energy in its $4.5 billion sale to Pioneer Natural Resources.

Akin Gump Strauss Hauer & Feld LLP

Akin Gump Strauss Hauer & Feld LLP focuses on securing merger clearance for complex, multi-stage transactions, including those requiring regulatory and antitrust clearance in multiple jurisdictions. The practice handles merger review and investigations by the DOJ and FTC, and also litigates effectively, notably representing Peabody Energy in the FTC’s case against its merger with Arch, a high-level involvement for accomplished antitrust litigator Gorav Jindal. Areas of strength for the firm include energy, financial services, electronics, and retail. Practice head Corey Roush  has litigated before the DOJ and FTC, and continues to lead on high-value deal clearances, representing 7-Eleven in securing FTC clearance for its $21bn acquisition Speedway, as well as notably securing clearance without a Second Request for Kingston Technology’s sale of its HyperX division to HP. Former FTC official Haidee L. Schwartz offers significant insight to clients on the agency’s strategies as well as providing support on merger clearances and investigations. Counsel Brian Rafkin joined from Dechert LLP in June 2021 and specializes in defending companies in litigated merger challenges. All attorneys mentioned are in Washington DC.

Practice head(s):

Corey Roush

Other key lawyers:

Gorav Jindal; Haidee L. Schwartz; Brian Rafkin

Key clients

7-Eleven, Inc.

Peabody Energy Corp.

Services Group, Inc.

US Concrete, Inc.

Kingston Technology Company, Inc.

MNG Enterprises, Inc.

Work highlights

  • Represented 7-Eleven in its $21 billion acquisition of Speedway from Marathon.
  • Advising Services Group, Inc. in its $240 million sale to Superior Plus Propane, a subsidiary of Superior Plus Corp.
  • Represented US Concrete in the company’s $1.3 billion sale to Vulcan Materials.

Axinn Veltrop & Harkrider

Axinn Veltrop & Harkrider advises on global merger proceedings for major clients in a variety of industries, with notable representations including those of Dell, Stanley Black & Decker, and Tyson Foods. The firm has a strong record in large-scale mergers of equals or market rivals, and also offers extensive in-house DOJ and FTC experience to clients facing merger reviews and government investigations. The practice is led by the vastly experienced pair of New York-based John Harkrider and Washington DC’s Michael Keeley, who have both advised on a large number of successful merger clearances, as well as representing in litigation against the DOJ Antitrust Division. New York’s Lisl Dunlop also combines merger clearance and litigation expertise, recently representing Tufts Health Plan in its $8bn combination with Harvard Pilgrim Health Care, while California-based Daniel Bitton is known for his work on behalf of major technology clients such as Google.

Practice head(s):

John Harkrider; Michael Keeley

Other key lawyers:

Lisl Dunlop; Daniel Bitton

Key clients


Thermo Fisher Scientific

Stanley Black & Decker

Tyson Foods


McKesson Corporation

Dell Technologies

Tufts Health Plan

Thales Group (France)

Cummins Inc.


Tyler Technologies

Sunrun Inc.

Columbia Care

Work highlights

  • Representing Google in the Texas-led State Attorney General complaint against Google’s ad technology business.
  • Represented Thermo Fisher Scientific in its proposed $12.5 billion acquisition of Qiagen.
  • Representing Stanley Black & Decker in its $1.6 billion acquisition of the remaining 80% stake in MTD Holdings Inc. and its $375 million acquisition of Excel Industries.

Clifford Chance

Clifford Chance has continued to expand its merger control offering, with counsel and HSR specialist Tarica Chambliss joining the Washington DC-based practice in April 2021 from a governmental role. The team combines a strong deal flow, advising a number of repeat clients on antitrust clearances, as well as offering expertise in more contentious proceedings, including merger investigations and challenges by the DOJ and FTC. In a significant development, the firm is currently representing General Electric in proceedings relating to  the sale of its GE Capital Aviation Services to AerCap. Notably, the firm includes a number of former DOJ officials who are able to advise clients on emerging trends within antitrust law, with practice co-head Sharis Pozen a former acting Assistant Attorney General, while Peter Mucchetti is a former head of the DOJ’s Healthcare and Consumer Products Section, and maintains strong expertise in those sectors. Timothy Cornell co-leads the team, and advises on merger clearances as well as representing clients in regulatory reviews. John Friel represents corporate and financial services clients, with particular strength in litigation and cross-border matters.

Practice head(s):

Timothy Cornell; Sharis Pozen

Other key lawyers:

Tarica Chambliss; John Friel; Peter Mucchetti


‘Sharis Pozen and Peter Mucchetti have deep knowledge and contemporary understanding of the laws and the agencies.’

‘Great industry knowledge on a global scale.’

Key clients

General Electric

Philip Morris International (PMI)





Epic Games




CVC Capital Partners

Partners Group


E+I Engineering Group


Deutsche Bank

ICBC Standard Bank

BMO Capital Markets Corp.

Institute of International Finance


Work highlights

  • Advising General Electric on AerCap’s acquisition of GE Capital Aviation Services business.
  • Advising Philip Morris International on responding to third-party document and deposition subpoenas issued by the U.S. Federal Trade Commission.
  • Representing Epic Games in global litigation and antitrust authority investigations.

Hughes Hubbard & Reed LLP

Hughes Hubbard & Reed LLP handles the full range of merger-related issues, including clearance filings, regulatory reviews and investigations, and representing clients against DOJ and FTC challenges. The firm has strong international expertise, including knowledge of antitrust regulations in China and Europe, and also offers a strong specialism to clients in the pharmaceutical, electronics, media & entertainment, and financial services industries. The Washington DC-based team is led by William J. Kolasky, a former deputy assistant Attorney General at the DOJ Antitrust Division, who has a successful record in merger clearances. Robert B. Bell is another key name, and combines merger control advice with regular work in government investigations. Philip Giordano continues to be active, and is currently representing ANI Pharmaceuticals in its high-profile pending acquisition of Novitium Pharma.

Practice head(s):

William J. Kolasky

Other key lawyers:

Robert B. Bell; Philip Giordano; Kirstin Millay


‘I have worked with the HHR antitrust DC team on a number of matters involving M&A, JVs and cooperation agreements. They are highly skillful in antitrust law with real experts in their team.’

‘Philip Giordano and Robert Bell stand out for their experience with antitrust matters and excellent technical skills as competition lawyers. Very responsive, team players and with a commercial and strategic approach.’

‘HHR is an excellent merger control practice. I have collaborated with HHR on a number of high-profile mergers, including the acquisition of Sotheby’s. They are highly responsive and have excellent FTC and DOJ contacts. Many of their antitrust attorney’s are ex Government.’

‘Partners Robert Bell and Philip Giordano are leaders in their field. Kirstin Millay is definite star of the future. They combine excellent client management skills with breadth of knowledge.’

Key clients

ANI Pharmaceuticals

JD Sports Fashion

Greenbriar Equity Group

Platinum Equity

Wipro Limited



Kensington Capital Acquisition Corp. II


Tao Group Hospitality

ION Investment Group

Geller & Co.

Work highlights

  • Represented global information technology company Wipro in its acquisition of British tech consultancy firm Capco for $1.45 billion.
  • Represented U.S. private equity firm Platinum Equity in a strategic partnership with rental equipment provider Nesco Holdings Inc. in the acquisition of heavy equipment solutions provider Custom Truck One Source for $1.475 billion.
  • Represented Greenbriar Equity Group and Nordco in Greenbriar’s sale of the railroad maintenance equipment supplier to Wabtec Corp for $400 million.

O'Melveny & Myers LLP

O’Melveny & Myers LLP represents clients in merger filings and complex regulatory investigations, acting as both HSR counsel to corporate clients and as a destination practice for high-profile merger investigations by the DOJ and FTC. The team has particularly strength in handling FTC Second Requests, and is also representing Penguin Random House in the high-profile DOJ challenge to its $2.18bn acquisition of Simon & Schuster from ViacomCBS. The team is led by Courtney Dyer, who has a successful record in defending mergers against government challenge, including proceedings for clients in the technology, healthcare, and life sciences sectors. Katrina Robson is also a standout figure for merger litigation, having defended a number of high-profile, business critical combinations before federal courts. Former DOJ official Julia Schiller rejoined the firm in February 2021, and has extensive experience in merger review proceedings and investigations. All lawyers mentioned are in Washington DC.

Practice head(s):

Katrina Robson; Courtney Dyer

Other key lawyers:

Julia Schiller

Key clients

Tractor Supply Co.

Asiana Airlines

Sportsman’s Warehouse

Seidler Equity Partners

Penguin Random House

Charles Schwab

DL Chemical

Genius Sports

Quest Diagnostics

Norsk Hydro

Work highlights

  • Representing leading outdoor sporting goods retailer Sportsman’s Warehouse in its acquisition by the Great American Outdoors Group- the FTC is conducting a Second Request review.
  • Representing Penguin Random House in the U.S. Department of Justice challenge of its proposed acquisition of Simon & Schuster.
  • Representing Tractor Supply Company in the FTC’s Second Request review of the company’s proposed $297 million acquisition of Orscheln Farm and Home.

Orrick, Herrington & Sutcliffe LLP

Orrick, Herrington & Sutcliffe LLP remains active on behalf of major clients including Microsoft, Zynga, and Clover Health, representing them throughout merger control processes for major strategic acquisitions, mergers, and investments, including DOJ and FTC reviews and challenges. The firm is strong in regulated industries including technology, energy, and healthcare, working with a number of companies in each sector. The team is led from Washington DC by Jay Jurata, who spearheads the firm’s relationship with Microsoft alongside maintaining an active merger practice. James Tierney previously headed the DOJ’s Networks and Technology Enforcement Section and retains a strong focus on tech sector transactions, as does highly-rated younger partner Amy Ray, who has recently advised on deals for Zynga and Microsoft.

Practice head(s):

Jay Jurata

Other key lawyers:

James Tierney; Amy Ray

Key clients

Microsoft Corporation

Fisker, Inc.

Zynga Inc.


Clover Health

Dave Inc.

Aria Energy

Green Dot Corporation

Superior Plus US Holdings

Novitium Pharma LLC

Work highlights

  • Advising developer Zynga on the antitrust aspects of its $250 million all- cash acquisition of Chartboost.
  • Advising Superior Plus on the antitrust aspects of its wholly-owned subsidiaries’ agreement to acquire the equity interests of Kamps Propane, High Country Propane, Pick Up Propane, Kiva Energy, Competitive Capital and Propane Construction and Meter Services for $240 million.
  • Advising Novitium Pharma in its $163.5 million acquisition by ANI Pharmaceuticals.

Paul Hastings LLP

Paul Hastings LLP advises clients in a broad range of industries, including healthcare, electronics, technology, and financial services, with a successful record in securing clearance for highly scrutinised mergers, from initial filing through to DOJ and FTC challenges. The firm has advised on a number of Second Requests for the likes of Samsung, American Airlines, and Dodge Data, and also co-ordinates global merger filings and responses to regulatory investigations by international antitrust authorities. The team is now led by the experienced pair of Gary Zanfagna,  a February 2021 arrival who was formerly chief antitrust counsel at Honeywell and a veteran of high-stakes merger proceedings, and Michael Murray, who arrived from the Antitrust Division in August 2021 and has great expertise in merger litigation. The ‘knowledgeable, responsiveMichael Wise remains a key name for complex merger clearances, and advised Francisco Partners on a strategic carve-out for Raytheon, which faced multi-jurisdictional merger and foreign investment challenges. New York-based senior associate Noah Pinegar is noted for his role in agency-led investigations and litigation, having formerly served at the FTC. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Gary Zanfagna

Other key lawyers:

Michael Murray; Michael Wise; Noah Pinegar


‘Best-in-class knowledge of the constantly evolving antitrust environment. The team is always on top of the latest developments and ahead of the curve in anticipating changes.’

‘Mike Wise is knowledgeable, responsive, and attentive to detail. Despite juggling dozens of transactions at once, he always remains intimately familiar with the details of your deal.’

‘Michael Wise has a detailed understanding of the field and an ability to see around corners.’

Key clients

Samsung Electronics

Francisco Partners

Canopy Growth

Symphony Technology Group

GI Partners

Teleperformance Group

LG Chem

Mitsubishi Corp.

Madison Industries


Boehringer Ingelheim

Maersk Line

Work highlights

  • Represented Goldman Sachs in the FTC investigation and suit to block Altria Group, Inc.’s acquisition of a 35% stake in JUUL Labs for $12.8 billion.
  • Represented Moody’s Corporation in its $2 billion agreement to acquire RMS.
  • Represented Francisco Partners in its acquisition of Forcepoint from Raytheon Technologies.

Sheppard, Mullin, Richter & Hampton LLP

Sheppard, Mullin, Richter & Hampton LLP has a prolific merger control practice, focusing primarily on mid-market M&A. Primarily handling HSR filings, the team is also able to advise clients through merger review and challenge proceedings, including regulatory and CFIUS issues. The firm is particularly known for its work in the healthcare space, with Washington DC-based practice co-head Bevin Newman an expert in advising on national and state-level healthcare transactions, including vertical combinations and innovative strategic alliances. Elsewhere, the firm has also advised on a number of crypto-related mergers, demonstrating expertise in this developing industry space. In Century City, co-head David Garcia combines merger control advice with an active litigation practice, representing clients before the DOJ and FTC in merger-related cases. The DC office was bolstered by the arrival of John Carroll from King & Spalding LLP in early 2021, a former FTC official with experience in merger litigation and media industry transactions.

Practice head(s):

Bevin Newman; David Garcia

Other key lawyers:

John Carroll

Key clients

U.S. Brick

Blue Shield of California



Doosan Corporation

SKOUT Solutions

Work highlights

  • Representing U.S. Brick in the purchase of certain assets being divested by Meridian and General Shale.
  • Represented BitGo Inc. in its acquisition by bitcoin-focused firm Galaxy Digital Holdings Ltd. for $1.2 billion.
  • Represented Extend in its $260M Series C funding round led by SoftBank Vision Fund 2.

Willkie Farr & Gallagher LLP

Willkie Farr & Gallagher LLP is expanding its antitrust offering in line with the firm’s expansion, with recently-opened offices in Chicago and Los Angeles alongside a broadly developing practice on the West Coast. The firm is now providing antitrust counsel to major tech clients such as Samsung, as well as continuing to provide strategic merger advice to its broad range of private equity and corporate clients. Notable clearances secured in 2021 include Time Manufacturing’s acquisition of the Ruthmann Group, a multi-jurisdictional merger that saw practice head William Rooney, a highly experienced advisor and successful litigator on antitrust issues, working with the firm’s London and Frankfurt offices. This cross-border expertise is another key selling point for the firm, combined with its increased geographical spread across the United States. Wesley Powell also plays a key role in merger reviews and regulatory investigations, as well as handling merger-related litigation, while practice co-head Jeffrey Korn handles merger clearances before US and European enforcement agencies. Counsel Agathe Richard also plays a key role in cross-border merger review work, assisting Rooney in Arkema’s successful clearance of its $1.36bn divestment of its PMMA business to Trinseo. All lawyers mentioned are in New York.

Practice head(s):

William Rooney; Jeffrey Korn

Other key lawyers:

Wesley Powell; Agathe Richard


‘Bill Rooney is an experienced attorney with a detailed understanding of the ins and outs of the field.’

Key clients


Akorn, Inc.

Apax Partners and other equity holders

Appriss Insights


FFL Partners and its portfolio companies

Frontline Road Safety

Genesis Park Acquisition Corp.

Highline Aftermarket

PAI Partners


Scientific Games Corporation

Teva Pharmaceutical Industries Ltd.

Thycotic, a portfolio company of Insight Partners

Time Manufacturing

Versant Health

Zurich Insurance Group and subsidiary Farmers Group, Inc.

Work highlights

  • Advised Time Manufacturing, a portfolio company of the Sterling Group, on all antitrust aspects related to the acquisition of the Ruthmann Group.
  • Represented Arkema in the proposed divestment of its polymethyl methacrylate business to Trinseo.
  • Representing Teva in an appeal pending before the General Court arising out of a prohibition decision by the European Commission in connection with a settlement of a patent infringement action between Teva and Cephalon regarding the pharmaceutical, modafinil case.


WilmerHale advises clients throughout complex merger review proceedings, including DOJ and FTC challenges, and offers integrated expertise in HSR compliance and contentious issues, including merger litigation. The firm works in highly scrutinised sectors such as energy and technology, and notably advised Baker Hughes on its joint venture with Akastor, which was cleared after several regulatory reviews. Key partner Leon Greenfield advised Danaher on its $9.6bn acquisition of Aldevron, reflecting his expertise in complex cross-border arrangements requiring multijurisdictional approval, while dual US and German-qualified Hartmut Schneider has remained active across a broad range of sectors, and offers bespoke expertise in intellectual property issues relating to mergers. The team is overseen by experienced antitrust litigator Thomas Mueller, while San Francisco-based Nana Wilberforce was promoted to partner in January 2022, and regularly assists clients facing merger investigations. Lawyers are in Washington DC unless otherwise stated.

Practice head(s):

Thomas Mueller

Other key lawyers:

Leon Greenfield; Hartmut Schneider; Nana Wilberforce

Key clients

Baker Hughes Inc.

Uber Technologies, Inc.

Danaher Corporation

Work highlights

  • Advised Baker Hughes Company in connection with its Subsea Drilling Services joint venture with Akastor.
  • Represented Uber Technologies in its acquisition of Cornershop, a grocery delivery firm, in a transaction valued at $1.4 billion overall.
  • Advised Danaher on the planned acquisition of Aldevron LLC for $9.6bn.

Allen & Overy LLP

Allen & Overy LLP strengthened its merger control offering, particularly in the tech sector, with the arrival of practice co-head Noah Brumfield in August 2021 from White & Case LLP. Brumfield has strong expertise in global merger review proceedings, and is currently leading on Globalwafers’ $5.4bn takeover of Silitronic, which includes approvals in Europe, Asia, and the United States. The firm broadly focuses on multi-jurisdictional matters, as well as advising clients on HSR filings, compliance and due diligence issues, and also handles FTC, DOJ, and state attorney general investigations into deals. Elaine Johnston co-leads the team, and has great experience in co-ordinating merger reviews across a broad range of sectors including oil and gas, financial services, and healthcare, alongside a strong niche in handling regulatory approvals for strategic privat equity-backed transactions. All lawyers mentioned are in Washington DC.

Practice head(s):

Elaine Johnston; Noah Brumfield

Other key lawyers:

Puja Patel


‘Very approachable, friendly team with a commercial approach but in-depth knowledge.’

‘Elaine Johnston is an excellent partner for in-house counsel with great insights on the law and the regulators, combined with a practical, commercial approach.’

‘Very experienced, efficient advisors.’

‘Noah Brumfield is a valued advisor because he knows our business extremely well and can provide prompt and actionable counsel when needed.’

‘Full-service firm capped with excellent lawyers in all legal areas.’

‘Noah Brumfield is an outstanding antitrust lawyer who deeply understands clients’ business and can provide clients with practical legal advice. Especially in merger control, we appreciate comprehensive and practical advice from Noah Brumfield.’

Key clients

WillScot Corporation



Experian plc

Imperial Brands

Pacific Equity Partners


First American



Associated British Foods





Baker McKenzie LLP

Baker McKenzie LLP forms part of the firm’s global antitrust offering, working seamlessly with international offerings on cross-border merger clearances within the US, both on behalf of US and foreign businesses. The team represents clients throughout merger proceedings and investigations, and is able to offer in-house DOJ and FTC experience to clients facing contentious processes. Major clients for the firm include Bayer, Nielsen, and Unilever, reflecting its broad jurisdictional and sector expertise. Mark Hamer is the firm’s global antitrust chair, and has advised many of the firm’s major international clients on merger control proceedings for business-critical deals. He leads the team alongside North America head Creighton Macy, who is also active in cross-border merger filings, as well as contentious proceedings for clients in a diverse range of industries. All lawyers mentioned are in Washington DC.

Practice head(s):

Mark Hamer; Creighton Macy


‘Highly qualified group with global practice. The breadth of their practice has been a significant benefit in our transactions, which tends to require counsel in multiple jurisdictions.’

Key clients


Bayer AG

Chr. Hansen

Environmental Data Resources


LaFargeHolcim Ltd.


NHK Spring



Quest Diagnostics

Sika AG


Zen-Noh Grain Corporation (ZGC)

Work highlights

  • Represented Informa in its strategic acquisition of Novantas.
  • Advised Zen-Noh Grain Corporation on the successful closing of its acquisition of approved assets from Bunge North America, Inc.
  • Represented Medicrea in its acquisition by Medtronic.

Cahill Gordon & Reindel LLP

Cahill Gordon & Reindel LLP advises a range of domestic and international clients, including private equity funds, and major names in retail and aviation, on merger control proceedings, with a focus on securing prompt clearance for strategic acquisitions. The firm also has a notable stable of financial services clients, and advises on competition aspects of cross-border financings, private equity investments, and capital markets transactions. The team is led from New York by Elai Katz , an experienced antitrust practitioner who takes the lead on the firm’s financial services relationships, and handles merger control issues for both corporate transactions and financing. Lauren Rackow is also increasing her profile on the financials services side, building relationships with several of the firm’s major clients.

Practice head(s):

Elai Katz

Other key lawyers:

Lauren Rackow


‘Effective, no nonsense and low ego advice from the team led by Elai Katz. Note that the team strengthened by recent promotion of Lauren Rackow. Low ego means probably less of a public profile than other louder competitors in the NY antitrust bar, but that isn’t a reflection of quality or client satisfaction.’

‘It is a pleasure working with Elai Katz and Lauren Rackow!’

Key clients


American Express

Arch Capital Group


Deutsche Bank

ICON plc

JP Morgan Securities

Morgan Stanley


S&P Global


Wells Fargo

Work highlights

  • Represented ICON plc in securing approvals around the world for its $12 billion acquisition of PRA Health.
  • Advised Arch Capital Group Ltd in its multi-party acquisition of Watford Holdings Ltd.

Cooley LLP

Cooley LLP has strong specialisms in the technology and life sciences sectors, working with a wide range of growth and innovation clients on merger reviews for business-critical deals, as well as transactions relating to the rollout and development of new products, particularly within the life sciences space. Alongside routine filings, the team is noted for its ability to secure clearance for deals subject to intense regulatory scrutiny by US, European, and other global authorities. In a high-profile representation, the firm acted for Horizon Therapeutics before the FTC in its $3bn acquisition of Viela, a major win for practice head Jacqueline Grise, who has an outstanding record across merger clearances and investigations in the tech and pharma spaces. Howard Morse is known for his work in the tech, pharma, and telecoms industries, and regularly handles contested mergers, including associated litigation. Megan Browdie handles merger reviews and contentious proceedings on behalf of global technology companies, and also notably represented meditech client One Medical in its $2.1 billion acquisition of Iora. All lawyers mentioned are in Washington DC.

Practice head(s):

Jacqueline Grise

Other key lawyers:

Howard Morse; Megan Browdie

Key clients

Horizon Therapeutics

Baylis Medical

1Life Healthcare

Meredith Corporation

Intersect ENT


Meredith Corporation and Gray Television

ZOLL Medical

Google, LLC


Work highlights

  • Represented Horizon Therapeutics before the FTC on its agreement to acquire Viela Bio.
  • Representing Baylis Medical before the FTC on its agreement to sell its cardiology business to Boston Scientific for an upfront payment of $1.75 billion.
  • Represented Meredith Corporation in its sale to to Gray Television for $2.8 billion.

King & Spalding LLP

King & Spalding LLP offers strong regulatory agency expertise, with a team including several former DOJ and FTC officials, and has continued to develop its profile within merger control, winning several new mandates including that of Quikrete Holding, whom it advised on the second request for its merger with Forterra. The firm is able to handle routine case filings as well as more complex deals, including second request investigations and judicial oversight proceedings, and is adept in successfully shepherding regulated industry mergers through investigatory hurdles. The team, which has a strong presence on both coasts, is led by Norm Armstrong and Jeffrey Spigel, both highly experienced practitioners with successful records in merger control cases, who regularly appear before the DOJ and FTC in merger investigations. Senior associate Chris Yook has a particular focus on cross-border M&A filings. Lawyers mentioned are in Washington DC.

Practice head(s):

Norm Armstrong; Jeff Spigel

Other key lawyers:

Chris Yook


Very knowledgeable.’

‘Excellent firm with a wealth of knowledge and experience.’

‘Norm Armstrong is excellent. He is the reason this case was resolved. His experience and knowledge is superior and was markedly notable in viewing an comparing other counsel from other firms involved in the matter. Antitrust is Norm’s lane. He is also a man of integrity. I appreciated his style and sense of humor.’

Key clients


Delta Airlines

BASF Corporation

The Coca-Cola Company

Xerox Corporation

Porsche Cars North America

The Home Depot


Peloton Interactive, Inc.


Acuity Brands Lighting, Inc.


Evangelical Community Hospital


Deutsche Bank

H.I.G. Capital

Huntington Ingalls Industries

HD Supply

Ochsner Health System

Mueller Water Products, Inc.


Starwood Energy Group

Tenet Healthcare

Under Armour

Hunter Douglas

Quikrete Holdings, Inc.

Westrock Company

Queen’s Health System

Viserion Grain, LLC

Work highlights

  • Advising Quikrete Holdings, Inc. on a Second Request regarding its proposed $2.74 billion acquisition of Forterra Inc.
  • Representing Mailchimp in merger control aspects of its $12 billion acquisition by Mountain View.
  • Represented Tenet Healthcare in its sale of its Saint Francis healthcare system in the greater Memphis area to Methodist Le Bonheur Healthcare.

Ropes & Gray LLP

Ropes & Gray LLP advises on a number of domestic and international merger clearances, including major deals in the healthcare and life sciences spaces. The team works in conjunction with its global offices on complex cross-border arrangements, and also maintains an active domestic HSR practice, regularly representing high-profile private equity clients such as Bain Capital in their antitrust filings. The antitrust team is led by Mark Popofsky in Washington DC, while Boston-based counsel Deirdre Johnson takes the lead on merger control work, advising prolifically on HSR filings and merger control proceedings for the firm’s multinational corporate and private equity clients, most notably advising Advent International on its $2.7bn acquisition of Nielsen Global Connect.

Practice head(s):

Mark Popofsky

Other key lawyers:

Deirdre Johnson


‘Ropes & Gray has a team-centric culture that distinguishes it from peers. The partners are responsive and knowledgeable, while associates are given significant responsibility and rise to the challenge.’

‘All of the individuals we worked with have been extremely personable, while maintaining professionalism. They were very supportive of our management team and led us through a process that was new to many on our side. Each member of the Ropes & Gray team that worked with us was well-versed in the matter, and worked efficiently and effectively.’

‘Deidre Johnson is extremely knowledgeable, commercial and responsive. She is a great resource to whom we can introduce potential transaction partners (and their counsel) to help everyone focus in on the jurisdictions and issues most likely to be relevant before going down a rabbit hole with all the possibilities.’

Key clients

Google Inc.

Baring Private Equity Asia Inc.

Harvard Pilgrim Health Care

Wright Medical Group

UniQure BioPharma

State Street Bank and Trust Company and Currenex, Inc.

TPG Capital, LP

Charter Communications

Acceleron Pharma

Heartland Dental LLC

HIG Capital LLC

Berkshire Partners

Advent International Corporation

Charlesbank Capital Partners LLC

Bain Capital LP

Mallinckrodt Pharmaceuticals, plc

Party City Holdings Inc.

The Capital Group

Work highlights

  • Advised Wright Medical on the antitrust aspects of its acquisition by Stryker Corporation.
  • Representing uniQure N.V., an investigational gene therapy company, on an agreement to license exclusively to CSL Behring worldwide rights to its pipeline gene therapy for Hemophilia B.
  • Advised Acceleron Pharma before US and foreign authorities in its major $11.5 billion sale to Merck & Co.