NAICS codes › 561611
NAICS 561611 — Investigation Services: federal contracts
4 open federal contract opportunities classified under NAICS 561611 (Investigation Services) on SAM.gov, refreshed nightly.
Open solicitations
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- USPS EEO Final Agency Decision Services - September 2026 Solicitation
- Request for Information - DCSA Personnel Vetting (PV) Fieldwork Services Requirement
- Forensic Polygraph services
- Field, Background-Investigative Services (Multiple Award)
Who buys NAICS 561611
| Agency | Obligations, 24 mo | Actions |
|---|---|---|
| Department of Homeland Security (DHS) | $355.5M | 341 |
| Department of Defense (DoD) | $80.2M | 115 |
| Department of Justice (DOJ) | $37.5M | 87 |
| Department of Health and Human Services (HHS) | $26.8M | 38 |
| Social Security Administration (SSA) | $23.4M | 7 |
| Department of Veterans Affairs (VA) | $22.1M | 17 |
| Department of Agriculture (USDA) | $13.0M | 14 |
| Department of the Treasury | $10.9M | 8 |
| Department of Commerce (DOC) | $2.0M | 17 |
| General Services Administration (GSA) | $1.6M | 8 |
Who wins NAICS 561611 work
| Contractor | Obligations, 24 mo | Awards |
|---|---|---|
| CACI, INC. - FEDERAL | $94.3M | 3 |
| PERATON RISK DECISION INC. | $67.8M | 4 |
| ASRC FEDERAL ADMINISTRATIVE SERVICES, LLC | $42.3M | 1 |
| PROTECTION STRATEGIES INC | $30.1M | 4 |
| OMNIPLEX WORLD SERVICES CORPORATION | $28.0M | 5 |
| EQUIFAX WORKFORCE SOLUTIONS LLC | $19.3M | 10 |
| CAPGEMINI GOVERNMENT SOLUTIONS LLC | $19.3M | 2 |
| CADUCEUS INC. | $14.0M | 2 |
| CAPITAL CENTER FOR CREDIBILITY ASSESSMENT CORPORATION | $13.9M | 26 |
| COMPUTER EVIDENCE SPECIALISTS, LLC | $13.7M | 25 |
NAICS 561611 contracts expiring in the next 18 months
237 contracts worth $2.5B. The largest:
| Incumbent | Buyer | What | Value | Ends | Est. solicitation | Record |
|---|---|---|---|---|---|---|
| PERATON RISK DECISION INC. | Defense Counterintelligence and Security Agency | 561611 Investigation and Personal Background Check Services | $874.4M | 31 March 2027 | Now / imminent | Details |
| CACI, INC. - FEDERAL | Defense Counterintelligence and Security Agency | 561611 Investigation and Personal Background Check Services | $861.5M | 31 March 2027 | Now / imminent | Details |
| CACI, INC. - FEDERAL | U.S. Customs and Border Protection | 561611 Investigation and Personal Background Check Services | $52.9M | 31 January 2027 | Now / imminent | Details |
| PROFESSIONAL RISK MANAGEMENT, INC. | FBI | 561611 Investigation and Personal Background Check Services | $51.6M | 30 September 2027 | ~Q2 2027 | Details |
| ASRC FEDERAL ADMINISTRATIVE SERVICES, LLC | Defense Counterintelligence and Security Agency | 561611 Investigation and Personal Background Check Services | $42.3M | 31 October 2026 | Now / imminent | Details |
| CACI, INC. - FEDERAL | U.S. Secret Service | 561611 Investigation and Personal Background Check Services | $41.3M (2 orders) | 28 February 2027 | Now / imminent | Details |
| FIVE STONES INTELLIGENCE, INC. | Bureau of Alcohol, Tobacco, Firearms and Explosives Acquisition and Property Management Division | 561611 Investigation and Personal Background Check Services | $38.3M | 30 September 2027 | ~Q2 2027 | Details |
| PROFESSIONAL RISK MANAGEMENT, INC. | Drug Enforcement Administration | 561611 Investigation and Personal Background Check Services | $37.6M | 30 September 2027 | ~Q2 2027 | Details |
| PERATON RISK DECISION INC. | U.S. Customs and Border Protection | 561611 Investigation and Personal Background Check Services | $37.1M | 31 January 2027 | Now / imminent | Details |
| OMNIPLEX WORLD SERVICES CORPORATION | U.S. Citizenship and Immigration Services | 561611 Investigation and Personal Background Check Services | $33.2M | 18 May 2027 | ~Q4 2026 | Details |
Every expiring NAICS 561611 contract →
Contracts and task orders from USASpending.gov (FPDS) whose period of performance ends within 18 months, valued at $25K or more, excluding IDIQ ceilings and government-owned, contractor-operated facility contracts. Co-terminous orders from the same vendor, agency, NAICS and PSC ending in the same month are grouped. The solicitation date is an estimate (about six months before the contract ends): FedSift does not know whether a follow-on has been posted, so check SAM.gov.
Open solicitations by set-aside
| Set-aside | Open |
|---|---|
| Unrestricted (full and open) | 2 |
| 8(a) | 1 |
| Small business | 1 |
From the set-aside SAM.gov declares on each open notice.
Who counts as small under this code
FedSift does not hold the SBA size standard for NAICS 561611. Check SBA's table of size standards before relying on small-business status.
Each solicitation carries exactly one NAICS code, and that code — not a related one in the same family — decides who counts as small.
One code, chosen by the contracting officer, decides who counts as small. A related code in the same family does not qualify you, and the assignment itself can be appealed to SBA OHA.
Source: FAR 19.102, current as of 07 August 2026 · eCFR.
Is NAICS 561611 work a fit for your company?
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DoD (5,697) · VA (339) · DHS (148) · USDA (118) · DOI (111) · DOE (102) · HHS (88) · DOJ (78) · GSA (77) · NASA (75) · State Department (64) · DOT (54) · DOC (31) · Treasury (20) · EPA (16) · Postal Service (7) · Administrative Office of the US Courts (6) · Millennium Challenge Corporation (5) · NSF (5) · United States Government Publishing Office (5) · Federal Deposit Insurance Corporation (4) · HUD (4) · Export-Import Bank of the US (3) · Library of Congress (3)
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