Withumsmith+Brown, PC
Princeton, NJ Doing business as Withumsmith & Brown PC
- UEI
- C5LDKJ8KEC59
- CAGE
- 4QH99
- Primary NAICS
- 541211 Offices of Certified Public Accountants
- SAM.gov registration
- Active through
Company facts
- Self-certified in SAM.gov
- Entity structure
- Corporate Entity (Not Tax Exempt)
- NAICS codes registered in SAM.gov
- SAM.gov registration date
- Physical address
- 506 Carnegie Center Dr #400, Princeton, NJ 08540, USA
- Website
- withum.com
- Founded
- 1974
- Employees
- 1K-5K
- Estimated annual revenue
- $500M-$1B
- Industry
-
- Financials
- Diversified Financial Services
- Accounting
- SIC code
- 87 Engineering & Management Services
- Profiles
Registration and certifications come from SAM.gov and the SBA; company details from public web sources. Updated .
Recent federal awards
| Award | Agency | Obligated | Awarded |
|---|---|---|---|
| Expert witness services are required for litigation of case by IRS chief counsel- financial accounting. | Internal Revenue Service | $1,302,214 | |
| Expert witness services in accordance with the statement of work in regard to united states (lehman) v. State of nevada,… | Civil Rights Division | $2,549 | |
| Litigative consultant services as per the attached statement of work case name: US VS. United states territory of guam… | Civil Rights Division | $36,561 | |
| FY2021 - investigative support - withum - kupu labor cost: $49,900.72 travel cost: 0 | Office of Procurement Services | $49,901 | |
| Withum, smith & brown FY2021 investigative support - withum - city year | Corporation for National and Community Service | $49,797 |
About Withumsmith+Brown, PC
Withumsmith+Brown, PC, a for-profit Subchapter S corporation based in Princeton, New Jersey, delivers expert witness testimony, litigation consulting, investigative support, and audit services to federal agencies as a prime contractor across 71 awards with no set-aside designations. The firm operates entirely on full-and-open competition and does not subcontract.
Withumsmith+Brown specializes in financial accounting and litigation support for federal counsel offices and inspector general organizations. Recent representative work includes a $1.34 million definitive contract awarded by the Internal Revenue Service Chief Counsel (effective through January 2031) for expert witness services in federal litigation matters involving financial accounting, structured as a labor-hour engagement with performance in Princeton; a $2,549 purchase order from the Department of Justice Civil Rights Division for expert witness services in United States v. State of Nevada (NVPERS case), completed July 2025; a $36.6 thousand purchase order from DOJ Civil Rights Division for litigative consultant services in a Guam case (completed April 2023); and a $49.9 thousand task order under the Corporation for National and Community Service's Kupu Labor Cost BPA for investigative support and audit services (completed March 2023).
Customer concentration is heavily weighted toward inspector general and oversight functions. The National Science Foundation Office of the Inspector General dominates the footprint with 25 awards valued at $16.7 million combined potential (52% of total dollars), while the Department of Labor Office of Inspector General contributes 10 awards ($2.7 million). The top five customer entities account for 72% of awards by count and 96% of combined potential value by dollars. Withumsmith+Brown sits on the GSA Multiple Award Schedule with 43 task orders ($19.8 million) and the Professional Services Schedule with 22 task orders ($3.5 million), anchoring its revenue vehicle to civilian and OIG procurement channels. Award activity has been sparse and intermittent — three awards in 2021, one in 2022, one in 2024, and one in 2026 — with only one award (valued at $150 thousand) reaching ultimate completion within the next twenty-four months, indicating minimal near-term recompete exposure. The primary NAICS framing reflects audit and accounting services (44 awards under Mortgage and Nonmortgage Loan Brokers NAICS, 11 under All Other Professional, Scientific, and Technical Services), with PSC coding concentrated on auditing support (50 awards) and professional and legal support services (20 awards combined).
Contract vehicles
Quick answers
What is Withumsmith+Brown, PC's UEI?
Withumsmith+Brown, PC's Unique Entity ID (UEI) in SAM.gov is C5LDKJ8KEC59.
What is Withumsmith+Brown, PC's CAGE code?
Withumsmith+Brown, PC's CAGE code is 4QH99.
What is Withumsmith+Brown, PC's primary NAICS code?
Withumsmith+Brown, PC's primary NAICS code is 541211 (Offices of Certified Public Accountants).
Where is Withumsmith+Brown, PC located?
Withumsmith+Brown, PC's physical address in SAM.gov is 506 Carnegie Center Dr #400, Princeton, NJ 08540, USA.
Is Withumsmith+Brown, PC registered in SAM.gov?
Yes. Withumsmith+Brown, PC's SAM.gov registration is active through August 27, 2027.
Which contract vehicles does Withumsmith+Brown, PC hold?
Withumsmith+Brown, PC holds a place on 2 federal contract vehicles, including MAS and PSS.
What is Withumsmith+Brown, PC's most recent federal award?
Withumsmith+Brown, PC's most recent federal contract award is Expert witness services are required for litigation of case by IRS chief counsel- financial accounting (2023H226C00008), from Internal Revenue Service, on January 20, 2026.
On GovTribe
See Withumsmith+Brown, PC's full federal record
- Federal contract awards
- IDV awards
- Contract vehicles
- Funding analysis by agency, NAICS and set-aside
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