When Fortune 500 companies, financial institutions, and high net-worth individuals face complex financial disputes, Stephen Ascher relentlessly pursues their goals. Stephen is a first-chair trial lawyer, regularly representing both plaintiffs and defendants. His clients gain better advice thanks to his extensive experience on both sides of the “v.”
Co-Chair of Jenner & Block’s Investor and Securities Litigation Practice, Stephen began his career as a white-collar criminal defense lawyer at a small firm where he learned to think strategically and creatively, addressing an unusually broad variety of situations and challenges. He gains a deep understanding of his clients’ businesses, enabling him to communicate with companies in their industry-specific language, and then simplify and explain these concepts to judges, arbitrators, and juries. Using keen quantitative skills, Stephen is particularly effective when cross-examining traders, accountants, and other witnesses with technical expertise.
Stephen takes on the big cases with extraordinary complexity and sophistication. While representing a major asset manager in a dispute with AIG concerning interest rate swaps, he led one of the largest solvency analyses in history, helping to secure a $600 million gain for the client. He has led numerous teams in matters where his client achieved a 9-digit recovery. For defendants, he has frequently developed novel defenses that resulted in dismissals.
Litigation requires a rare combination of aggression and judgment. Aggression, to pursue arguments and avenues relentlessly. And the judgment to know which are the most likely to be successful.
Representative Matters
- Leading the representation of Microsoft and Activision in highly publicized breach of fiduciary duty litigation arising out of Microsoft’s $70 billion acquisition of Activision.
- Tried a theft of trade secrets claim against a Fortune 500 pharma company on behalf of a major biotech company. After a 3-week trial, proved that client trade secrets had been misappropriated.
- Represented institutional investors in numerous claims arising out of “built to fail” CDOs after the 2008 financial crisis. Clients recovered hundreds of millions of dollars in settlements.
- Successfully guided one of the largest cannabis companies in the United States in several arbitrations and lawsuits related to dealings with minority investors and their securities offerings.
- Represented several world-class hedge funds and trading firms in nine-figure disputes concerning derivatives, structured finance transactions, and trade secrets.
- Represented major real estate companies in disputes with other market participants and borrowers.
- Regularly represents Fortune 500 and other significant companies in securities litigation.
Credentials
Service / Recognition
Overview
When Fortune 500 companies, financial institutions, and high net-worth individuals face complex financial disputes, Stephen Ascher relentlessly pursues their goals. Stephen is a first-chair trial lawyer, regularly representing both plaintiffs and defendants. His clients gain better advice thanks to his extensive experience on both sides of the “v.”
Co-Chair of Jenner & Block’s Investor and Securities Litigation Practice, Stephen began his career as a white-collar criminal defense lawyer at a small firm where he learned to think strategically and creatively, addressing an unusually broad variety of situations and challenges. He gains a deep understanding of his clients’ businesses, enabling him to communicate with companies in their industry-specific language, and then simplify and explain these concepts to judges, arbitrators, and juries. Using keen quantitative skills, Stephen is particularly effective when cross-examining traders, accountants, and other witnesses with technical expertise.
Stephen takes on the big cases with extraordinary complexity and sophistication. While representing a major asset manager in a dispute with AIG concerning interest rate swaps, he led one of the largest solvency analyses in history, helping to secure a $600 million gain for the client. He has led numerous teams in matters where his client achieved a 9-digit recovery. For defendants, he has frequently developed novel defenses that resulted in dismissals.
Litigation requires a rare combination of aggression and judgment. Aggression, to pursue arguments and avenues relentlessly. And the judgment to know which are the most likely to be successful.
Areas of Focus
Representative Matters
- Leading the representation of Microsoft and Activision in highly publicized breach of fiduciary duty litigation arising out of Microsoft’s $70 billion acquisition of Activision.
- Tried a theft of trade secrets claim against a Fortune 500 pharma company on behalf of a major biotech company. After a 3-week trial, proved that client trade secrets had been misappropriated.
- Represented institutional investors in numerous claims arising out of “built to fail” CDOs after the 2008 financial crisis. Clients recovered hundreds of millions of dollars in settlements.
- Successfully guided one of the largest cannabis companies in the United States in several arbitrations and lawsuits related to dealings with minority investors and their securities offerings.
- Represented several world-class hedge funds and trading firms in nine-figure disputes concerning derivatives, structured finance transactions, and trade secrets.
- Represented major real estate companies in disputes with other market participants and borrowers.
- Regularly represents Fortune 500 and other significant companies in securities litigation.
Credentials
Admissions
- New York, 1993
Education
- Harvard Law School, JD, cum laude, 1991
- Harvard College, BA, magna cum laude, 1988
Court Admissions
- US Supreme Court, 2000
- US Court of Appeals, Second Circuit, 2005
- US Court of Appeals, Eleventh Circuit, 2004
- US District Court, Eastern District of New York, 1993
- US District Court, Southern District of New York, 1993
Clerkships
- Hon. Jesse E. Eschbach, US Court of Appeals, Seventh Circuit, 1991-1992
Service / Recognition
Awards
- Chambers USA, Litigation: Securities (New York), 2021-2025
- New York Metro Super Lawyers, 2008-2022, in Securities Litigation, Criminal Defense: White Collar, and General Litigation.
- Legal 500, Dispute Resolution, Securities Litigation - Defense, 2016-2021; Cannabis, 2021
- Leaders League, Litigation & Competition Directory, Securities Litigation, 2018
- The Best Lawyers in America, Litigation-Banking and Finance, 2026
Service to the Bar
- American Bar Association, Securities Litigation Committee, Member
- Association of the Bar of the City of New York, Member
- New York State Bar Association, White-Collar Criminal Defense Committee, Member, 2007-2010
- New York State Bar Association, Hedge Fund and Capital Markets Litigation, Co-Chair, 2013