Covering an array of industries, including finance, hedge funds, and technology companies, Katten‘s securities litigation defense team is spearheaded by Bruce Vanyo and Michael Diver. Vanyo’s expertise is utilized across the firm’s New York and Los Angeles offices. Diver co-chairs the New York office and frequently works in Chicago, representing public companies and their individual officers and directors in regulatory matters and civil litigation, with a particular expertise in Securities and Exchange Commission (SEC) investigations. Richard Zelichov joined the team in Los Angeles in February 2026 from DLA Piper.
Legal 500 Editorial commentary
Testimonials
Collated independently by Legal 500 research team.
- ‘We use Katten for a piece of litigation, high stakes and contentious. They are very good.’
- ‘Bruce Vanyo is a really good negotiator and an actual human being as well.’
- ‘Christina Costley is really tough and smart.’
Key clients
- Aeva Technologies
- Barclays Capital Inc.
- BioAge Labs, Inc
- BioNTech, SE
- BMO Capital Markets Corp.
- CIBC World Markets Inc. (CIBC – Canadian Imperial Bank of Commerce)
- Coupa Software, Inc.
- Flywire Corporation
- HAP Trading, LLC
- Inotiv, Inc.
- Lime Trading Corp.
- Macquarie Futures USA, Inc.
Work highlights
Representing TuSimple in litigation related to SINA’s USD 2.6 billion going-private transaction.
Representing John Clendening in connection with several high-profile securities class actions arising out of Silicon Valley Bank's collapse in March 2023.
Representing Natera and certain current and former officers and directors in a securities class action lawsuit pending in the US District Court for the Western District of Texas.
Lawyers
Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Practice head
Bruce Vanyo; Michael Diver
Other key lawyers
Michael Lohnes; Gideon Caine; Kevin Broughel; Jonathan Rotenberg; Sarah Eichenberger; Richard Zelichov