About Us

OUM & Co. was formed in 1976, when Roger Odenberg and James Ullakko left an international accounting firm to establish their own tax practice. John Muranishi, Paul Ainslie, and Chris Millias joined OUM shortly thereafter, to expand the tax practice and add an assurance and advisory practice. The rest, as they say, is history.

OUM is one of the leading CPA firms in California, with offices in San Francisco, San Ramon and the San Diego area. We have over 80 professional staff and many of our partners and senior managers were previously partners and managers at Big 4 firms. Since 2000, the San Francisco Business Times has included OUM in their annual ranking of the "Top 25 Largest Bay Area Accounting Firms." We have also been included in Inside Public Accounting's annual list of the "Top 200 Accounting Firms in the Nation."

In 2004, our firm became an independent member of the BDO Alliance USA, a nationwide association of independently owned local and regional accounting, consulting and service firms with similar client service goals. Our membership in the BDO Alliance USA affords us access to national and international resources, technical experience, specialized knowledge, quality assurance, high caliber training, and the latest technical and reporting developments.

Our firm has been registered with the Public Company Accounting Oversight Board (PCAOB) since its inception. The PCAOB examines our assurance work papers at least every three years. We currently serve thirteen publicly-traded companies. The AICPA also examines our assurance work papers every three years, and has always issued unqualified opinions on our non-public assurance practice, most recently in November 2014.