• Accountants - Certified Public
601 California St., Ste. 1800
San Francisco, CA 94108
(415) 434-3744
  • About

    OUM & Co. LLP was formed in 1976 and is a leading accounting & business advisory firm in California, with offices in San Francisco and San Diego. Our firm is listed as a Top 25 Bay Area firm, and recognized as one of the Top 200 firms in the U.S. by INSIDE Public Accounting and we have over eighty professionals, many of whom are experienced partners and managers (formerly with Big 4 firms). We offer solutions to our clients with timely communication, lower overhead costs compared to the Big 4, and the continuity of a seasoned and highly experienced professional staff.

    We provide high quality assurance, tax and advisory services, and are committed to building lifelong relationships with our clients, employees and the communities we serve. We foster diverse ideas and encourage our people to bring their authentic self to work in a collaborative and fun environment. Our expertise is focused on biotech, specialty pharma, diagnostic and medical device sectors industry. Did you know that we are one of the top assurance and tax firms for Life Sciences in California?

    From hundreds of BDO Alliance USA member firms, we are one of six selected as IPA's Best of the Best firms in the nation by Inside Public Accounting for 2018. Get to know us, and see what we stand for.


    Audit, tax, & advisory services to public (SEC) & private companies in the life sciences, technology, real estate, private equity/investment fund and manufacturing industries among others.