LAWYER PROFILE
Rita-Anne O'Neill

Rita-Anne O'Neill

USA 2026

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Ranked in 1 practice area

About

Provided by Sullivan & Cromwell LLP

Practice Areas

M&A, Private Equity.

Career

Rita O’Neill is a partner in S&C’s Los Angeles office, a member of the Firm’s M&A Group and co-head of the Firm’s Global Private Equity Group. A leader in strategic and Private Equity M&A, Rita’s ability to seamlessly transition between strategic M&A and Private Equity makes her a go-to advisor for highly complex transactions and competitive auction processes—particularly for clients eager to capitalize on current market disruptions—including taking private undervalued public companies by sponsors, as well as executing strategic minority investments.

Over the course of her career, Rita has been sought out by leading global clients within a variety of industries, including consumer and retail, financial services, healthcare and life sciences, industrials, semiconductors, telecommunications and transportation. Recent clients include Ares Management, Crescent Capital, FTX, Grupo México Infraestructura, Lion Capital, Oaktree Capital, Ontario Teachers’ Pension Plan, TPG Angelo Gordon and Wren House Infrastructure, among others.

Rita is chair of the ABA M&A Committee. She is the former chair of the ABA’s Acquisition of Public Companies Subcommittee, its Market Trends Subcommittee and its Deal Points Study on Carveout Transactions. Rita is a member of S&C’s Women’s Initiative Committee and is the co-founder and co-chair of a national Women in M&A Network (WiMA), a network of senior women dealmakers. Rita is co-chair of the Tulane Corporate Law Institute and the Cambridge Forum on US Private Equity, and regularly participates on panels and guest teaches classes at law schools related to substantive M&A topics. She is a member of the Boston College Law School Dean’s Advisory Board.

Rita has been named a “Top Woman in Dealmaking” by The Deal twice and was named among the most influential Women in Mid-Market M&A by Mergers & Acquisitions. She was also shortlisted for “Private Equity Lawyer of the Year” by Euromoney Women in Business Law Awards. She has also been recognized by the Los Angeles Business Journal as one of the “Most Influential Private Equity Investors and Advisors” and as one of the “Women Making a Difference” in Los Angeles.

Before earning her JD from Boston College Law School, Rita graduated from Wellesley College with a B.A. Following law school, she clerked for the Honorable Norman H. Stahl on the Court of Appeals for the First Circuit.

Professional Memberships

ABA M&A Committee (Chair); Women in M&A Network (WiMA) (Co-Founder and Co-Chair); Tulane Corporate Law Institute (Co-Chair); Cambridge Forum on US Private Equity (Co-Chair); Boston College Law School Dean’s Advisory Board (Member)

Chambers Review

Provided by Chambers

Chambers Guide to the USA

Private Equity: Buyouts - California

Band 2
Band 2

Individual Editorial
Rita-Anne O'Neill is a seasoned practitioner who serves as co-head of the firm's global private equity group. She frequently acts on behalf of private equity firms in M&A and securities transactions.

Strengths

Provided by Chambers

  • Rita is always available, responsive and able to provide a quick but thoughtful initial perspective and simultaneously mobilize a team. She is terrific.

    Private Equity: BuyoutsChambers Guide to the USA
  • Rita provides world-class guidance, advice and leadership.

    Private Equity: BuyoutsChambers Guide to the USA
  • She's technically very good and very loyal and protective of her clients.

    Private Equity: BuyoutsChambers Guide to the USA

Ranked Individuals at Sullivan & Cromwell LLP (144)

California

California: Los Angeles & Surrounds

California: San Francisco, Silicon Valley & Surrou

District of Columbia

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