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Sullivan & Cromwell LLP

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John L. Hardiman

Work +1-212-558-4000
Sullivan & Cromwell LLP


John Hardiman has practiced in Sullivan & Cromwell’s litigation department for over 30 years, handling a wide array of litigation, arbitration and regulatory matters. Mr. Hardiman has led the Firm’s Merger and Acquisition-related litigation for a number of years, working on many high stakes contests for corporate control. He also has extensive experience handling regulatory investigations for the Firm’s broker-dealer and corporate clients, as well as standard commercial litigation. For further information on his practice, please visit S&C's website:

United States: Dispute resolution

International arbitration

Within: International arbitration

Headline work for Sullivan & Cromwell LLP included successfully obtaining a $814.9m arbitration award on behalf of BlackBerry in an arbitration against Qualcomm, and representing Centerra Gold in a UNCITRAL arbitration against the Kyrgyz Republic and national mining company relating to disputes over a mining concession. Department head Joseph Neuhaus is ‘outstanding’, and John Hardiman and special counsel Thomas Walsh are also noted. Named individuals are based in New York.

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M&A litigation: defense

Within: M&A litigation: defense

Sullivan & Cromwell LLP plays a prominent role in some of the most high-profile hostile takeover cases and shareholder class and derivative actions in the US, and represents clients in industries as diverse as telecoms, energy and healthcare. Brian Frawley in New York leads the M&A litigation team along with John Hardiman and Los Angeles-based Robert Sacks. Sacks successfully defended AT&T in the appeal of a shareholder class action settlement arising from its acquisition of Leap Wireless International in 2013. Frawley’s highlights included the successful representation of former members of the board of Solera, with the dismissal with prejudice of claims of breach of fiduciary duty relating to its $6.5bn sale to Vista Equity Partners. He also defeated a putative class action for Columbia Pipeline Group that challenged its spin-off from NiSource Inc. Michael Steinberg in Los Angeles helped Volcano Corporation secure its motion to dismiss claims filed by former shareholders of Philips Holding USA.

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