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 more than 160 professionals and support staff.

We serve clients in many industries including technology, life sciences, nonprofit, real estate, construction, hospitality & consumer products, manufacturing, professional services, financial services, and vehicle dealerships – providing tax, assurance, tax, consulting, business valuations, outsourced accounting, and IT Risk services to name a few from our extensive service menu.

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 closely-held companies and partnerships, nonprofits, and middle market public companies. 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.