David C. Mahaffey

David C. Mahaffey

Mutual Funds Law Securities Regulation
Recognized Since Recognized in Best Lawyers since 2009

About David

David is the managing partner of the Washington, D.C. office, as well as the co-leader of the Investment Management Group. Prior to joining Sullivan & Worcester, David was Special Counsel in the Washington, D.C. office of Gibson, Dunn & Crutcher. He previously served as Assistant General Counsel for Legislation and Investment Company and Adviser Regulation at the Securities and Exchange Commission and as Counsel to SEC Commissioner Aulana Peters.

David is the managing partner of the Washington, D.C. office, as well as the co-leader of the Investment Management Group. Prior to joining Sullivan & Worcester, David was Special Counsel in the Washington, D.C. office of Gibson, Dunn & Crutcher. He previously served as Assistant General Counsel for Legislation and Investment Company and Adviser Regulation at the Securities and Exchange Commission and as Counsel to SEC Commissioner Aulana Peters.

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Reviews

4.4 / 5

0 Reviews

1,005 Profile Views

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Amara Okonkwo

Jan 05, 2026

Exceptional responsiveness and clear communication throughout our case

I was facing a complex mutual fund compliance issue that required immediate attention. David Mahaffey was incredibly responsive from our first consultation. He always returned my calls and emails with...

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Henrik Johansson

Jan 05, 2026

Unparalleled expertise in securities regulation matters

Our investment firm needed guidance on navigating new SEC regulations affecting our mutual fund offerings. David's deep knowledge was immediately apparent - his background at the SEC gave him insights...

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Yuki Nakamura

Jan 05, 2026

Secured favorable settlement in mutual fund dispute

Our company was involved in a contentious mutual fund fee dispute that threatened significant financial exposure. David Mahaffey negotiated a settlement that exceeded our expectations. Through careful...

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Fatima Al-Rashid

Jan 05, 2026

Compassionate guidance during a difficult regulatory investigation

When our family office faced an SEC investigation regarding investment adviser regulations, I was overwhelmed with anxiety. David showed remarkable compassion while providing expert legal defense. He...

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Diego Alvarez

Jan 05, 2026

Professionalism that enhances your firm's reputation

As general counsel for a financial institution, I've worked with many securities attorneys. David Mahaffey stands out for his impeccable professionalism. His reputation in the mutual funds law communi...