Five people standing and raising hands
Top 200 firms 2018
2018 Best Firm for Equity Leadership
On the List Largest Accounting Firms 2018
Best of the best firms 2018
On the List Largest Accounting Firms 2018
CalCPM Member
CalCPM Member


A Bay Area accounting firm going strong since 1976, we offer sophisticated, big firm resources with a regional firm’s team ownership and responsiveness. From start-up to exit strategy, we will guide you through your entire Business Development Life Cycle.

Our CPA firm was built on the core philosophy of providing the highest quality of service and building lifelong relationships with our clients, employees and the communities we serve in the Bay Area and San Diego. When you work with us, you will see how our values are embedded in everything we do – and how they enhance your experience and our performance.

As OUM continually assesses how to best assist clients, we joined forces with a consortium of other value-driven CPA firms throughout the U.S. As an independent member of BDO Alliance USA, we have access to national and international resources, technical expertise, specialized knowledge, high caliber training, and the latest technical and reporting developments.

A testament to the firm’s accounting prowess, OUM has consistently been ranked among the top CPA firms in the Bay Area. OUM has been included in the San Francisco Business Times’ ranking of the “Top 25 Largest Bay Area Accounting Firms” and Inside Public Accounting’s list of the “Top 200 Accounting Firms in the Nation.”

The Accounting & Financial Women’s Alliance and its Accounting MOVE (Money, Opportunity, Vital supports, and Entrepreneurship) Project releases an annual report on female leadership and gender equity at CPA firms and OUM has been awarded “Best Firm for Women” 3 years in a row!

Our clients choose us for our unique combination of intensive partner and manager involvement, industry focused teams, and the breadth of services of a national network (through our affiliation with BDO) with the personal attention of a boutique firm.

Your needs are owned and addressed by an entire team, not just one main contact, so you are always provided with the highest level of service, and never have to educate someone about what you do.


  • Deep resources with an established national/international network
  • Streamlined, accessible organizational structure
  • Fewer conflicts and hierarchies than those inherent in larger firms. This translates into swift resolutions of important issues or questions. You deal directly with the decision makers.


  • High partner-to-staff ratio
  • Direct access to highly technical, experienced service teams


  • Swift responsiveness and hands-on, service-oriented philosophy
  • Open and candid communication