Peterson Sullivan is a leading local public accounting and business advisory firm based in Seattle, Washington. We are ranked among the top 10 largest CPA firms in the Puget Sound region, with close to 200 professionals and support staff.

We serve clients in many industries including dealerships, nonprofit, real estate, construction, hospitality, financial services, technology, life sciences and professional services – providing assurance, tax, business valuations and litigation support services. For over 65 years, Peterson Sullivan has helped clients maximize their value. Our values of integrity, respect, commitment, and expertise are key to a successful client relationship and relevant in all aspects of our business.

Decisions are made at the local level, so clients never have to wait for an answer from a remote city with no direct involvement with their account. This type of client commitment means faster response to the problems you are facing and more direct investment in the success of your organization.

Our clients include small, closely held companies and partnerships, nonprofits, and small-middle market public companies with revenues exceeding $350 million operating in many states. These companies have realized the benefit of working with a local firm that shares their values, is responsive to their needs, and has the depth of experience and resources that will help them grow.