Peterson Sullivan LLP
Peterson Sullivan LLP is a Seattle-based accounting firm providing audit, tax, and advisory services to mid-market and enterprise business clients in the Pacific Northwest; since November 2019 it has operated as part of BDO USA.
- Company typePrivate
- Founded1953
- HeadquartersAnchorage, United States
- Headcount101–250
- GTM typeB2B
- OfferingServices
What Peterson Sullivan LLP does
Peterson Sullivan LLP is a Pacific Northwest professional services firm founded in 1953, historically headquartered in Seattle and operating as the seventh-largest accounting firm in the Puget Sound region. The firm delivers three core service lines — Audit & Assurance, Tax, and Advisory — spanning audit services, accounting advisory, employee benefit plan audits, outsourced finance and accounting, technology risk assurance, corporate and international tax, partnership tax, state and local tax, transfer pricing, M&A and transaction advisory, valuation, forensics, and turnaround and restructuring. Customers are primarily mid-market and enterprise business clients requiring comprehensive financial reporting, compliance, and transaction support; the firm does not disclose customer names or concentration.
The firm was acquired by BDO USA effective November 1, 2019, with partners and professionals joining BDO's national network while continuing to serve clients under the BDO brand. Post-integration, Peterson Sullivan's service surface expanded materially to include BDO Digital (AI, cybersecurity, cloud, data analytics, ERP), Industry Specialty Consulting (government contracting, life sciences), and a full Sustainability / ESG practice. The business model is engagement-based professional services billing; pricing is not publicly disclosed and is likely quote-driven based on engagement scope and complexity. Distribution is direct, relationship-driven client delivery supplemented by cross-referrals within the BDO USA network and alliance partners. The firm is recognized as one of Washington's Best Workplaces (Puget Sound Business Journal) and one of the nation's Best Accounting Firms to Work For (Accounting Today), supporting a talent-driven competitive position in a competitive regional labor market.
Peterson Sullivan LLP firmographics
Firmographics- Name
- Peterson Sullivan LLP
- Legal name
- Peterson Sullivan LLP
- Website
- https://pscpa.com
- Company type
- Private
- Founded year
- 1953
- Operating status
- Acquired
- Headcount range
- 101–250 employees
- Short description
- Peterson Sullivan LLP is a Seattle-based accounting firm providing audit, tax, and advisory services to mid-market and enterprise business clients in the Pacific Northwest; since November 2019 it has operated as part of BDO USA.
- Ownership category
- akta.pro rank
Where Peterson Sullivan LLP is headquartered
LocationHeadquarters
- HQ city
- Anchorage
- HQ country
- United States
- HQ region
- North America
Offices1 record
Markets served
Peterson Sullivan LLP business model
Business model- GTM type
- B2B
- Offering type
- Services
- Cost components
- Personnel, Operations, Technology or R&D, Marketing or Sales
Revenue model
- Audit & Assurance Services: Provides audit services, accounting standards & reporting matters, accounting advisory, employee benefit plan audits, outsourced finance and accounting, and technology risk assurance.
- Tax Services: Provides corporate tax, international tax, partnership tax, private client services, state & local tax, tax risk, transfer pricing, and tax transaction advisory services.
- Advisory Services: Provides forensics and investigations, insurance risk & recovery, investment banking, management consulting, M&A and transaction advisory, people strategy, privacy & data protection, risk & resilience, turnaround & restructuring, and valuation & capital market analysis.
Go-to-market motion1 record
Distribution channels2 records
Marketing channels4 records
Peterson Sullivan LLP product offering
Product offeringCore offering
Peterson Sullivan LLP is a professional services firm providing audit and assurance, tax, and advisory services to business clients in the Pacific Northwest region. The firm joined BDO USA effective November 1, 2019, and operates as part of the BDO network while continuing to serve clients in the Seattle/Puget Sound area. Service offerings span corporate and individual tax compliance, financial statement audits, employee benefit plan audits, M&A advisory, management consulting, forensics, valuation, and risk advisory.
Product overview
Peterson Sullivan LLP is a professional services firm offering a unified portfolio of accounting, tax, and advisory services. The firm's core offerings are organized into three main service lines: Audit & Assurance Services (covering audit services, accounting advisory, employee benefit plan audits, outsourced finance and accounting, and technology risk assurance), Tax Services (covering corporate tax, international tax, partnership tax, state and local tax, transfer pricing, and tax automation), and Advisory Services (covering M&A advisory, management consulting, forensics, risk advisory, and valuation). These services work together to provide clients with comprehensive financial and business advisory support. Peterson Sullivan joined BDO USA effective November 1, 2019, strengthening BDO's presence in the Pacific Northwest.
Differentiator
Problem solved
Functional benefit
Products and services
- Audit & Assurance Services Comprehensive audit and assurance services including audit services, accounting standards and reporting matters, accounting advisory outsourcing, employee benefit plan audits, outsourced finance and accounting, technology risk assurance, risk advisory, and third party attestation, delivered to mid-market and enterprise organizations in the Pacific Northwest.
- Tax Services Full-spectrum tax services covering business incentives and tax credits, corporate tax, global employer services, income tax accounting, international tax, partnership tax, private client services, state and local tax, tax automation and innovation, tax risk services, tax transaction advisory, and transfer pricing.
- Advisory Services Strategic advisory services including forensics and investigations, insurance risk and recovery, investment banking and capital raising, management consulting, M&A and transaction advisory, people strategy and solutions, privacy and data protection, risk and resilience, turnaround and restructuring, and valuation and capital market analysis.
Companies that use Peterson Sullivan LLP
Customer profileSegments2 records
Ideal customer profiles1 record
Peterson Sullivan LLP technology and API
TechnologyTechnology focussed No
API detail
- Has API
- No
- API docs
- API detail
Core technology
AI maturity
App detail
Peterson Sullivan LLP partnerships and signals
Strategic signalPartnerships
One partnership is on record.
- BDO USAcorePeterson Sullivan LLP joined BDO USA effective November 1, 2019. The partnership expands BDO's Pacific Northwest practice and enhances the firm's assurance, tax, and advisory practices. Peterson Sullivan continues to operate under the same service model that clients have known, now backed by BDO's resources and national network.
Scale indicators2 records
Recent moves5 records
Expansion highlights5 records
Peterson Sullivan LLP competitors and assessment
Company assessmentDirect peers
- Moss Adams LLP: Headquartered in Seattle, Moss Adams is the largest Pacific Northwest-based accounting and business advisory firm and the most direct competitor to the historical Peterson Sullivan footprint in the PNW mid-market.
- Clark Nuber PS: Bellevue-based CPA and advisory firm serving closely comparable Pacific Northwest mid-market clients with audit, tax, and business advisory — overlapping service mix and target customer base.
- Grant Thornton LLP: National mid-tier accounting firm delivering audit, tax, and advisory services — direct comparable on scale, service portfolio, and mid-market positioning.
- RSM US LLP: Leading U.S. mid-tier professional services firm providing audit, tax, and consulting to middle-market companies — competing head-to-head for the same mid-market client profile.
- Baker Tilly US LLP: Top-tier U.S. mid-market accounting and advisory firm with comparable three-pillar service offering (audit, tax, advisory) targeting similar mid-market and closely held business clients.
- Plante Moran PLLC: Large U.S. mid-tier accounting and advisory firm with a comparable service model focused on privately held and middle-market organizations.
- Crowe LLP: National mid-tier public accounting and advisory firm with audit, tax, and consulting practices — closely comparable in target client and service breadth.
Broad incumbents
- Deloitte LLP: One of the Big 4 global professional services networks offering audit, tax, and advisory at massive scale — sets the upper-bound competitive benchmark for capability and pricing.
- BDO USA: Parent firm since the November 1, 2019 acquisition, BDO USA is the U.S. member of BDO International and provides the same full-spectrum audit, tax, and advisory services at significantly larger national and global scale.
Regional players
- Larson Gross PLLC: Pacific Northwest-based CPA firm headquartered in Washington State serving SMB and mid-market clients — a smaller-scale regional peer with similar geographic concentration.
Market position
Strengths3 records
Weaknesses3 records
Competitive moat3 records
Key risks4 records
Key highlights5 records
Customer concentration
Peterson Sullivan LLP social profiles
Digital presencePeterson Sullivan LLP financial estimates
Financial estimateRevenue estimate
Valuation estimate
Peterson Sullivan LLP leadership team
Management profileNumber of profiles
Profiles3 records
Peterson Sullivan LLP funding detail
Funding detailFunding overview
Funding rounds
Investors
Funding detail is available on the Subscription and Enterprise plan.Contact sales →
Peterson Sullivan LLP M&A and investment
M&A and investmentM&A
Investments
M&A and investment is available on the Subscription and Enterprise plan.Contact sales →
Frequently asked questions about Peterson Sullivan LLP
What does Peterson Sullivan LLP do?
Peterson Sullivan LLP is a professional services firm providing audit and assurance, tax, and advisory services to business clients in the Pacific Northwest region. The firm joined BDO USA effective November 1, 2019, and operates as part of the BDO network while continuing to serve clients in the Seattle/Puget Sound area. Service offerings span corporate and individual tax compliance, financial statement audits, employee benefit plan audits, M&A advisory, management consulting, forensics, valuation, and risk advisory.
Is Peterson Sullivan LLP a public or private company?
Peterson Sullivan LLP is a private company. It is classified as corporate owned and is currently acquired.
When was Peterson Sullivan LLP founded?
Peterson Sullivan LLP was founded in 1953. It employs 101 to 250 people.
Where is Peterson Sullivan LLP based?
Peterson Sullivan LLP is headquartered in Anchorage, United States, in the North America region.
How does Peterson Sullivan LLP make money?
Three revenue lines are on record. Audit & Assurance Services are the primary driver. The others are tax Services and advisory Services.
Who are Peterson Sullivan LLP's main competitors?
Direct peers on record are Moss Adams LLP, Clark Nuber PS, Grant Thornton LLP, RSM US LLP, Baker Tilly US LLP, Plante Moran PLLC and Crowe LLP. Broad incumbents are Deloitte LLP and BDO USA. Larson Gross PLLC is listed as a regional player.
Does Peterson Sullivan LLP have an API?
No public API is recorded for Peterson Sullivan LLP.