Top 100 Contractors in NAICS 561611: Investigation and Personal Background Check Services, FY2024

Name: Top 100 Contractors in NAICS 561611: Investigation and Personal Background Check Services, FY2024
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2023 – Sep 30, 2024 Code page on GovTribe

The top 10 won 79% of FY2024 NAICS 561611 contract dollars

Contract obligations: $730,220,737 Net of deobligations, by contracts coded NAICS 561611
Contractors: 298 Parent companies with an obligation
Largest contractor: CACI International Inc. $216 million, 26.2% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	CACI International Inc. 3 awardees, including Caci, Inc. - Federal Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$216,347,431	26.2%	Rank history: #1 in FY2021, #2 in FY2022, #2 in FY2023 and #2 in FY2025; up 1 since FY2023.
2	Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency) DHS (Department of Homeland Security)	$131,093,431	15.9%	Rank history: not on the FY2021–FY2023 lists and #1 in FY2025; new.
3	HP Enterprise Services LLC Through Peraton Risk Decision Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency)	$94,629,315	11.5%	Rank history: #7 in FY2021, #1 in FY2022, #1 in FY2023 and not on the FY2025 list; down 2 since FY2023.
4	Arctic Slope Regional Corporation Through Asrc Federal Professional Services, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$79,854,812	9.7%	Rank history: not on the FY2021–FY2022 lists, #5 in FY2023 and #5 in FY2025; up 1 since FY2023.
5	Professional Risk Management, Inc. Top agencies DOJ (Department of Justice)	$30,105,741	3.6%	Rank history: #13 in FY2021, #10 in FY2022, #8 in FY2023 and #4 in FY2025; up 3 since FY2023.
6	Protection Strategies Inc. Top agencies HHS (Department of Health and Human Services) DHS (Department of Homeland Security) DOJ (Department of Justice)	$25,283,624	3.1%	Rank history: #5 in FY2021, #4 in FY2022, #3 in FY2023 and #7 in FY2025; down 3 since FY2023.
7	Equifax Workforce Solutions LLC Top agencies SSA (Social Security Administration) DCSA (Defense Counterintelligence and Security Agency) DOS (Department of State)	$24,941,160	3.0%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2025; new.
8	Madison Associates Inc. Top agencies DOJ (Department of Justice) HHS (Department of Health and Human Services) DODIG (Department of Defense Inspector General)	$21,865,584	2.6%	Rank history: #12 in FY2021, #9 in FY2022, #7 in FY2023 and #3 in FY2025; down 1 since FY2023.
9	Iworks Corp 2 awardees Top agencies DCSA (Defense Counterintelligence and Security Agency)	$14,158,675	1.7%	Rank history: #9 in FY2021, #8 in FY2022, #9 in FY2023 and #9 in FY2025; unchanged since FY2023.
10	Constellis, LLC Through Omniplex World Services Corporation Top agencies DHS (Department of Homeland Security) SSA (Social Security Administration)	$11,036,334	1.3%	Rank history: not on the FY2021–FY2023 lists and #10 in FY2025; new.
11	Five Stones Intelligence Inc. 2 awardees Top agencies DOJ (Department of Justice)	$10,207,932	1.2%	Rank history: #16 in FY2021, #12 in FY2022, #11 in FY2023 and #13 in FY2025; unchanged since FY2023.
12	Coventbridge (USA) LLC Top agencies USDA (Department of Agriculture)	$9,922,947	1.2%	Rank history: not on the FY2021–FY2023 lists and #12 in FY2025; new.
13	EAP Consultants, LLC Top agencies SSA (Social Security Administration) DHS (Department of Homeland Security) USDA (Department of Agriculture)	$8,549,958	1.0%	Rank history: #18 in FY2021, #16 in FY2022, #14 in FY2023 and #21 in FY2025; up 1 since FY2023.
14	The Ross Agency, Inc. Top agencies VA (Department of Veterans Affairs)	$6,200,595	0.8%	Rank history: #27 in FY2021, #26 in FY2022, #20 in FY2023 and #16 in FY2025; up 6 since FY2023.
15	Ho-Chunk Shared Services Company Top agencies USAF (Department of the Air Force)	$6,178,777	0.7%	Rank history: not on the FY2021–FY2022 lists, #21 in FY2023 and not on the FY2025 list; up 6 since FY2023.
16	Olgoonik Innovations, LLC Top agencies DOS (Department of State)	$6,097,040	0.7%	Rank history: not on the FY2021–FY2023 lists and #8 in FY2025; new.
17	Nemean Solutions LLC Top agencies Army (Department of the Army)	$5,565,112	0.7%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2023 and #23 in FY2025; up 13 since FY2023.
18	Blocktrace LLC Top agencies Treasury (Department of the Treasury)	$5,335,476	0.6%	Rank history: not on the FY2021–FY2023 lists and #19 in FY2025; new.
19	Capital Center for Credibility Assessment Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$5,324,255	0.6%	Rank history: #11 in FY2021, #7 in FY2022, #12 in FY2023 and #14 in FY2025; down 7 since FY2023.
20	Anasec, Inc. Top agencies DHS (Department of Homeland Security)	$4,964,983	0.6%	Rank history: #15 in FY2021, #27 in FY2022, #22 in FY2023 and #15 in FY2025; up 2 since FY2023.
21	Potomac River Group, LLC Top agencies DOJ (Department of Justice)	$3,665,075	0.4%	Rank history: #17 in FY2021, #18 in FY2022, #16 in FY2023 and #39 in FY2025; down 5 since FY2023.
22	Vertical Screen, Inc. Through Fieldprint Inc. Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice) Navy (Department of the Navy)	$3,329,189	0.4%	Rank history: #28 in FY2021, #20 in FY2022, #15 in FY2023 and not on the FY2025 list; down 7 since FY2023.
23	Chenega Defense & Aerospace Solutions, LLC Top agencies Treasury (Department of the Treasury)	$2,999,352	0.4%	Rank history: not on the FY2021–FY2022 lists, #33 in FY2023 and #22 in FY2025; up 10 since FY2023.
24	Information Systems & Networks Corporation Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$2,888,098	0.3%	Rank history: #22 in FY2021, #17 in FY2022, #18 in FY2023 and #11 in FY2025; down 6 since FY2023.
25	DNI Emerging Technologies, LLC Top agencies HHS (Department of Health and Human Services)	$2,391,377	0.3%	Rank history: not on the FY2021–FY2022 lists, #29 in FY2023 and #26 in FY2025; up 4 since FY2023.
26	Government Retirement & Benefits, Inc. Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) Commerce (Department of Commerce)	$2,339,494	0.3%	Rank history: #38 in FY2021, #32 in FY2022, #34 in FY2023 and #27 in FY2025; up 8 since FY2023.
27	Crossroads Mediation Services, Inc. Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation) DOS (Department of State)	$2,299,327	0.3%	Rank history: #29 in FY2021, #29 in FY2022, #31 in FY2023 and #29 in FY2025; up 4 since FY2023.
28	Potomac Management Solutions LLC Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) Commerce (Department of Commerce)	$1,987,950	0.2%	Rank history: #48 in FY2021, #31 in FY2022, #25 in FY2023 and #38 in FY2025; down 3 since FY2023.
29	Chainalysis Government Solutions LLC Top agencies Treasury (Department of the Treasury)	$1,984,185	0.2%	Rank history: not on the FY2021–FY2023 lists and #54 in FY2025; new.
30	The Washington Center for Internships and Academic Seminars Top agencies HHS (Department of Health and Human Services) GSA (General Services Administration) Treasury (Department of the Treasury)	$1,948,097	0.2%	Rank history: #26 in FY2021, #30 in FY2022, #26 in FY2023 and not on the FY2025 list; down 4 since FY2023.
31	Gant Global Services (GGS) Inc. Top agencies VA (Department of Veterans Affairs) HUD (Department of Housing and Urban Development)	$1,888,244	0.2%	Rank history: not on the FY2021–FY2022 lists, #39 in FY2023 and #51 in FY2025; up 8 since FY2023.
32	Fieldprint Inc. Top agencies Treasury (Department of the Treasury) DHS (Department of Homeland Security) DOJ (Department of Justice)	$1,816,103	0.2%	Rank history: not on the FY2021 list, #90 in FY2022, not on the FY2023 list and #20 in FY2025; returned.
33	Omniplex World Services Corp Top agencies DHS (Department of Homeland Security)	$1,574,739	0.2%	Rank history: not on the FY2021 list, #24 in FY2022, #4 in FY2023 and not on the FY2025 list; down 29 since FY2023.
34	S.j. Bashen, Inc. Top agencies DHS (Department of Homeland Security) DECA (Defense Commissary Agency) DOI (Department of the Interior)	$1,529,891	0.2%	Rank history: #42 in FY2021, #38 in FY2022, #28 in FY2023 and #25 in FY2025; down 6 since FY2023.
35	David Jones CPA PC Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) DNFSB (Defense Nuclear Facilities Safety Board)	$1,485,954	0.2%	Rank history: not on the FY2021–FY2022 lists, #47 in FY2023 and #33 in FY2025; up 12 since FY2023.
36	Sierra Tahoe Investigations Top agencies VA (Department of Veterans Affairs)	$1,348,357	0.2%	Rank history: #39 in FY2021, #57 in FY2022, #45 in FY2023 and #30 in FY2025; up 9 since FY2023.
37	Amentum Services, Inc. Top agencies Army (Department of the Army)	$1,339,574	0.2%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
38	Computer Evidence Specialists, LLC Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$1,335,264	0.2%	Rank history: #45 in FY2021, #55 in FY2022, #49 in FY2023 and #18 in FY2025; up 11 since FY2023.
39	Martin Miser Cody & Associates LLC Top agencies VA (Department of Veterans Affairs)	$1,186,425	0.1%	Rank history: #40 in FY2021, #47 in FY2022, #46 in FY2023 and #36 in FY2025; up 7 since FY2023.
40	HR Anew Inc. Top agencies DHS (Department of Homeland Security)	$1,029,661	0.1%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023 and #49 in FY2025; up 22 since FY2023.
41	The Ravens Group, Inc. Top agencies VA (Department of Veterans Affairs)	$1,022,143	0.1%	Rank history: #46 in FY2021, #52 in FY2022, #51 in FY2023 and #32 in FY2025; up 10 since FY2023.
42	Whooster Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) USDA (Department of Agriculture)	$1,000,450	0.1%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2023 and #47 in FY2025; up 11 since FY2023.
43	The Law Offices of Stuart L. Plotnick, LLC Top agencies USDA (Department of Agriculture) Commerce (Department of Commerce) EOP (Executive Office of the President)	$937,211	0.1%	Rank history: #36 in FY2021, #37 in FY2022, #38 in FY2023 and not on the FY2025 list; down 5 since FY2023.
44	County of Geauga Through Geauga County Of Top agencies SSA (Social Security Administration)	$856,598	0.1%	Rank history: #52 in FY2021, #44 in FY2022, #43 in FY2023 and not on the FY2025 list; down 1 since FY2023.
45	Immersive Concepts L.L.C. Top agencies GAO (Government Accountability Office)	$835,723	0.1%	Rank history: not on the FY2021–FY2023 lists and #43 in FY2025; new.
46	Advanced EEO Solutions LLC Top agencies Navy (Department of the Navy) DOT (Department of Transportation) DOJ (Department of Justice)	$821,461	0.1%	Rank history: not on the FY2021 list, #84 in FY2022, #63 in FY2023 and #48 in FY2025; up 17 since FY2023.
47	Professionally Written, L.L.C. Top agencies DHS (Department of Homeland Security)	$818,317	0.1%	Rank history: not on the FY2021 list, #83 in FY2022, #94 in FY2023 and #78 in FY2025; up 47 since FY2023.
48	County of ST Louis Through ST. Louis County, Missouri Top agencies SSA (Social Security Administration)	$667,604	0.1%	Rank history: #55 in FY2021, #48 in FY2022, #48 in FY2023 and #46 in FY2025; unchanged since FY2023.
49	Business Decisions Information Inc. Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$559,426	0.1%	Rank history: not on the FY2021 list, #53 in FY2022, #73 in FY2023 and #59 in FY2025; up 24 since FY2023.
50	Adept Services, Inc. Top agencies DOJ (Department of Justice)	$543,141	0.1%	Rank history: #41 in FY2021, #45 in FY2022, #40 in FY2023 and #44 in FY2025; down 10 since FY2023.
51	Platinum Business Services, LLC Top agencies HHS (Department of Health and Human Services)	$531,827	0.1%	Rank history: #63 in FY2021, #62 in FY2022, #50 in FY2023 and not on the FY2025 list; down 1 since FY2023.
52	Skopenow Inc. Top agencies USAF (Department of the Air Force) DOJ (Department of Justice) DHS (Department of Homeland Security)	$531,500	0.1%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2023 and #53 in FY2025; up 4 since FY2023.
53	Key Bridge Foundation for Education and Research Top agencies DOJ (Department of Justice)	$526,676	0.1%	Rank history: #64 in FY2021, #63 in FY2022, #41 in FY2023 and #50 in FY2025; down 12 since FY2023.
54	Venesco LLC Top agencies Navy (Department of the Navy)	$524,169	0.1%	Rank history: #57 in FY2021, #50 in FY2022, not on the FY2023 list and not on the FY2025 list; returned.
55	PAE Professional Services LLC Top agencies DOE (Department of Energy)	$508,657	0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
56	Harris County Top agencies SSA (Social Security Administration)	$505,616	0.1%	Rank history: #77 in FY2021, #67 in FY2022, #44 in FY2023 and #60 in FY2025; down 12 since FY2023.
57	Inroads, Inc. Top agencies Treasury (Department of the Treasury) EXIM (Export Import Bank of the US) HHS (Department of Health and Human Services)	$469,157	0.1%	Rank history: #82 in FY2021, not on the FY2022 list, #67 in FY2023 and not on the FY2025 list; up 10 since FY2023.
58	Chenega Naswik International LLC Top agencies Navy (Department of the Navy)	$457,960	0.1%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2025; new.
59	Relx Inc. 2 awardees, including Lexisnexis Risk Solutions Inc. Top agencies Treasury (Department of the Treasury) DHS (Department of Homeland Security) DOE (Department of Energy)	$437,726	0.1%	Rank history: not on the FY2021–FY2023 lists and #87 in FY2025; new.
60	Strativia LLC Top agencies CNCS (Corporation for National and Community Service)	$380,779	<0.1%	Rank history: #60 in FY2021, #56 in FY2022, #58 in FY2023 and not on the FY2025 list; down 2 since FY2023.
61	Resolution Services, L.l.c Top agencies Commerce (Department of Commerce) DHS (Department of Homeland Security) DOJ (Department of Justice)	$374,380	<0.1%	Rank history: #49 in FY2021, #59 in FY2022, #54 in FY2023 and #64 in FY2025; down 7 since FY2023.
62	Icris, LLC Top agencies Commerce (Department of Commerce) USDA (Department of Agriculture) Navy (Department of the Navy)	$368,619	<0.1%	Rank history: #56 in FY2021, #60 in FY2022, #83 in FY2023 and #56 in FY2025; up 21 since FY2023.
63	Serco Inc Top agencies DLA (Defense Logistics Agency)	$355,303	<0.1%	Rank history: not on the FY2021–FY2022 lists, #72 in FY2023 and not on the FY2025 list; up 9 since FY2023.
64	Madison County Prosecutor Top agencies SSA (Social Security Administration)	$308,117	<0.1%	Rank history: not on the FY2021–FY2023 lists and #57 in FY2025; new.
65	Information Discovery Services, LLC Top agencies HHS (Department of Health and Human Services) SEC (Securities and Exchange Commission) SSA (Social Security Administration)	$284,547	<0.1%	Rank history: #58 in FY2021, #61 in FY2022, #59 in FY2023 and #35 in FY2025; down 6 since FY2023.
66	Kentech Consulting Inc. Top agencies DOJ (Department of Justice) SEC (Securities and Exchange Commission)	$201,248	<0.1%	Rank history: #47 in FY2021, #68 in FY2022, #75 in FY2023 and #62 in FY2025; up 9 since FY2023.
67	Brandon Spears LLC Top agencies DOJ (Department of Justice)	$158,252	<0.1%	Rank history: not on the FY2021 list, #94 in FY2022, #92 in FY2023 and #68 in FY2025; up 25 since FY2023.
68	Coolahan Corey Top agencies DOJ (Department of Justice)	$154,621	<0.1%	Rank history: #98 in FY2021, #78 in FY2022, #90 in FY2023 and #66 in FY2025; up 22 since FY2023.
69	Expert Resolutions, LLC Top agencies DOJ (Department of Justice)	$151,816	<0.1%	Rank history: #97 in FY2021, #98 in FY2022, #93 in FY2023 and #69 in FY2025; up 24 since FY2023.
70	Jbcn Investigations LLC Top agencies DOJ (Department of Justice)	$146,258	<0.1%	Rank history: not on the FY2021 list, #95 in FY2022, #91 in FY2023 and not on the FY2025 list; up 21 since FY2023.
71	Guare Dean Top agencies DOJ (Department of Justice)	$144,000	<0.1%	Rank history: #87 in FY2021, #89 in FY2022, #79 in FY2023 and #65 in FY2025; up 8 since FY2023.
72	City of Chicago Top agencies SSA (Social Security Administration)	$141,729	<0.1%	Rank history: not on the FY2021–FY2023 lists and #58 in FY2025; new.
73	Mind Your Business Inc Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$137,488	<0.1%	Rank history: not on the FY2021–FY2022 lists, #76 in FY2023 and #70 in FY2025; up 3 since FY2023.
74	JP Investigative Associates LLC Top agencies DOJ (Department of Justice)	$132,568	<0.1%	Rank history: #96 in FY2021, #77 in FY2022, #84 in FY2023 and #67 in FY2025; up 10 since FY2023.
75	Morales & Associates LLC Top agencies USDA (Department of Agriculture)	$128,800	<0.1%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2025; up 65 since FY2023.
76	Hanson Raymond L Top agencies DOJ (Department of Justice)	$127,605	<0.1%	Rank history: not on the FY2021 list, #87 in FY2022, not on the FY2023 list and #76 in FY2025; up 152 since FY2023.
77	Darnall Kenneth J Top agencies DOJ (Department of Justice)	$125,401	<0.1%	Rank history: #94 in FY2021, #97 in FY2022, #89 in FY2023 and #73 in FY2025; up 12 since FY2023.
78	Integra FEC LLC Top agencies SEC (Securities and Exchange Commission)	$123,880	<0.1%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2023 and not on the FY2025 list; down 14 since FY2023.
79	WCD Integrity Solutions LLC Top agencies DOJ (Department of Justice)	$121,800	<0.1%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2023 and #79 in FY2025; up 8 since FY2023.
80	Kent Carter Investigations, LLC Top agencies DOJ (Department of Justice)	$116,000	<0.1%	Rank history: not on the FY2021–FY2022 lists, #86 in FY2023 and #81 in FY2025; up 6 since FY2023.
81	Dgs, LLC Top agencies DOJ (Department of Justice)	$114,764	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 23 since FY2023.
82	Esposito Christopher Top agencies DOJ (Department of Justice)	$104,358	<0.1%	Rank history: not on the FY2021–FY2022 lists, #78 in FY2023 and #83 in FY2025; down 4 since FY2023.
83	Dubois Michelle Top agencies DOJ (Department of Justice)	$103,878	<0.1%	Rank history: not on the FY2021–FY2022 lists, #82 in FY2023 and not on the FY2025 list; down 1 since FY2023.
84	Enumclaw General Information Top agencies DOI (Department of the Interior)	$100,781	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
85	Planning, Inc. Top agencies Treasury (Department of the Treasury)	$94,588	<0.1%	Rank history: #73 in FY2021, #80 in FY2022, #81 in FY2023 and not on the FY2025 list; down 4 since FY2023.
86	Equifax Inc. Through Equifax Workforce Solutions LLC Top agencies DOJ (Department of Justice) DOS (Department of State)	$92,739	<0.1%	Rank history: #14 in FY2021, #15 in FY2022, #10 in FY2023 and not on the FY2025 list; down 76 since FY2023.
87	National Law Enforcement Telecommunication System (Nlets), Inc. Top agencies DHS (Department of Homeland Security)	$88,268	<0.1%	Rank history: not on the FY2021–FY2023 lists and #80 in FY2025; up 14 since FY2023.
88	Echelon Services, LLC Top agencies Army (Department of the Army)	$87,536	<0.1%	Rank history: not on the FY2021–FY2023 lists and #74 in FY2025; new.
89	Biometrics4All, LLC Top agencies Peace Corps USDA (Department of Agriculture) SBA (Small Business Administration)	$81,442	<0.1%	Rank history: #93 in FY2021, not on the FY2022–FY2023 lists and not on the FY2025 list; up 159 since FY2023.
90	Synergy America, Inc. Top agencies DOJ (Department of Justice)	$81,053	<0.1%	Rank history: not on the FY2021–FY2023 lists and #82 in FY2025; up 13 since FY2023.
91	Elizabeth H Turner Top agencies DOJ (Department of Justice)	$70,125	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 18 since FY2023.
92	Gotham Dynamics Inc. Top agencies DOJ (Department of Justice) Peace Corps	$68,866	<0.1%	Rank history: not on the FY2021–FY2023 lists and #92 in FY2025; up 36 since FY2023.
93	Consultores De Datos Del Caribe SRL Top agencies DHS (Department of Homeland Security)	$67,802	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 32 since FY2023.
94	Forensic Psychology Consultants LLC Top agencies DHS (Department of Homeland Security)	$63,000	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 188 since FY2023.
95	Blue Arbor Inc. Top agencies DOJ (Department of Justice)	$62,500	<0.1%	Rank history: #86 in FY2021, #93 in FY2022, not on the FY2023 list and not on the FY2025 list; up 12 since FY2023.
96	AL. Dept. of Public Health Through Alabama State Law Enforcement Agency Top agencies NASA (National Aeronautics and Space Administration)	$60,800	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; up 154 since FY2023.
97	Engineering Systems Inc. Top agencies DHS (Department of Homeland Security)	$59,800	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
98	New TECH Solutions, Inc. Top agencies DOS (Department of State)	$58,767	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
99	ASI Apex Surveillance and Investigation, Inc. Top agencies SEC (Securities and Exchange Commission)	$52,450	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.
100	FEI Behavioral Health, Inc. Top agencies VA (Department of Veterans Affairs)	$51,039	<0.1%	Rank history: not on the FY2021–FY2023 lists and not on the FY2025 list; new.

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100 of 298 contractors listed here. See the rest on GovTribe.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $826 million obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2024 ran Oct 1, 2023 – Sep 30, 2024. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2023. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2023 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 NAICS 561611 contractors in FY2024?

1. CACI International Inc. ($216M), 2. Peraton Risk Decision Inc. ($131M), 3. HP Enterprise Services LLC ($94.6M), 4. Arctic Slope Regional Corporation ($79.9M), 5. Professional Risk Management, Inc. ($30.1M), 6. Protection Strategies Inc. ($25.3M), 7. Equifax Workforce Solutions LLC ($24.9M), 8. Madison Associates Inc. ($21.9M), 9. Iworks Corp ($14.2M), 10. Constellis, LLC ($11M).

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