Top 100 Contractors in PSC B: Special Studies/Analysis, Not R&D, Jul 2025–Jun 2026

Name: Top 100 Contractors in PSC B: Special Studies/Analysis, Not R&D, Jul 2025–Jun 2026
Creator: GovTribe

Parent companies by net contract obligations Jul 1, 2025 – Jun 30, 2026 Code page on GovTribe

The top 10 won 30% of PSC B contract dollars from July 2025 through June 2026

Contract obligations: $2,476,129,883 Net of deobligations, by contracts coded PSC B or a code under it
Contractors: 1,686 Parent companies with an obligation
Largest contractor: Parsons Corporation $172 million, 5.6% 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	Parsons Corporation Through Parsons Government Services Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$171,847,738	5.6%	Rank history: not on the FY2021–FY2022 lists, #8 in FY2023, #4 in FY2024 and #2 in FY2025; up 1 since Jul 2024–Jun 2025.
2	Johns Hopkins University 2 awardees, including The Johns Hopkins University Applied Physics Laboratory LLC Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) DTRA (Defense Threat Reduction Agency)	$141,702,420	4.6%	Rank history: not on the FY2021–FY2024 lists and #4 in FY2025; new, not ranked in Jul 2024–Jun 2025.
3	The Rand Corporation Top agencies OSD (Office of the Secretary of Defense) USAF (Department of the Air Force) Army (Department of the Army)	$123,939,225	4.0%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2023, #2 in FY2024 and #5 in FY2025; unchanged since Jul 2024–Jun 2025.
4	Booz Allen Hamilton Holding Corporation 2 awardees, including Booz Allen Hamilton Inc. and Riverside Engineering LLC Top agencies NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force) Navy (Department of the Navy)	$113,027,159	3.7%	Rank history: #4 in FY2021, #3 in FY2022, #4 in FY2023, #6 in FY2024 and #8 in FY2025; up 3 since Jul 2024–Jun 2025.
5	The CNA Corporation Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense)	$98,325,525	3.2%	Rank history: #5 in FY2021, #6 in FY2022, #6 in FY2023, #7 in FY2024 and #7 in FY2025; up 3 since Jul 2024–Jun 2025.
6	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) ED (Department of Education) NSF (National Science Foundation)	$74,438,021	2.4%	Rank history: #6 in FY2021, #4 in FY2022, #5 in FY2023, #5 in FY2024 and #9 in FY2025; up 3 since Jul 2024–Jun 2025.
7	Deloitte 2 awardees, including Deloitte Consulting LLP and Deloitte & Touche LLP Top agencies Treasury (Department of the Treasury) HHS (Department of Health and Human Services) DHS (Department of Homeland Security)	$55,922,442	1.8%	Rank history: not on the FY2021–FY2023 lists, #8 in FY2024 and #12 in FY2025; up 5 since Jul 2024–Jun 2025.
8	Ameresco Inc. Top agencies GSA (General Services Administration) USAF (Department of the Air Force) DOI (Department of the Interior)	$48,867,633	1.6%	Rank history: #12 in FY2021, #20 in FY2022, #10 in FY2023, #21 in FY2024 and #1 in FY2025; down 7 since Jul 2024–Jun 2025.
9	Educational Testing Service Top agencies ED (Department of Education)	$46,171,492	1.5%	Rank history: #7 in FY2021, #7 in FY2022, #7 in FY2023, #9 in FY2024 and #10 in FY2025; up 2 since Jul 2024–Jun 2025.
10	Guidehouse Inc. 6 awardees, including Aptim Federal Services, LLC and Peraton Inc. Top agencies VA (Department of Veterans Affairs) DHS (Department of Homeland Security) Treasury (Department of the Treasury)	$40,653,166	1.3%	Rank history: not on the FY2021–FY2023 lists, #27 in FY2024 and #13 in FY2025; up 93 since Jul 2024–Jun 2025.
11	Dzyne Technologies, LLC Top agencies USAF (Department of the Air Force)	$39,518,042	1.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
12	American Institute In Taiwan Top agencies DOS (Department of State)	$38,906,757	1.3%	Rank history: not on the FY2021–FY2024 lists and #29 in FY2025; up 146 since Jul 2024–Jun 2025.
13	Amentum Holdings, Inc. Through Amentum Services, Inc. Top agencies Army (Department of the Army)	$38,867,641	1.3%	Rank history: not on the FY2021–FY2024 lists and #11 in FY2025; up 1 since Jul 2024–Jun 2025.
14	Westat, Inc. 2 awardees Top agencies ED (Department of Education) DOT (Department of Transportation) DOL (Department of Labor)	$34,832,918	1.1%	Rank history: #15 in FY2021, #22 in FY2022, #16 in FY2023, #11 in FY2024 and #17 in FY2025; down 4 since Jul 2024–Jun 2025.
15	Unwin Co Top agencies DOE (Department of Energy)	$29,341,481	1.0%	Rank history: #14 in FY2021, #11 in FY2022, #11 in FY2023, #12 in FY2024 and #14 in FY2025; unchanged since Jul 2024–Jun 2025.
16	Gulf South Research Corp Top agencies DHS (Department of Homeland Security) Army (Department of the Army) DOT (Department of Transportation)	$26,762,481	0.9%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; up 345 since Jul 2024–Jun 2025.
17	ManTech International Corporation Through Mantech Advanced Systems International, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$24,865,444	0.8%	Rank history: not on the FY2021–FY2024 lists and #26 in FY2025; up 12 since Jul 2024–Jun 2025.
18	The Mitre Corporation Top agencies DHS (Department of Homeland Security) DOS (Department of State) HHS (Department of Health and Human Services)	$23,348,339	0.8%	Rank history: not on the FY2021–FY2023 lists, #15 in FY2024 and #40 in FY2025; down 2 since Jul 2024–Jun 2025.
19	Vernadero Group Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army) IBWC (International Boundary and Water Commission U.S.-Mexico)	$22,723,760	0.7%	Rank history: not on the FY2021–FY2024 lists and #49 in FY2025; up 235 since Jul 2024–Jun 2025.
20	Empower AI, Inc. Top agencies HHS (Department of Health and Human Services)	$22,286,901	0.7%	Rank history: not on the FY2021–FY2023 lists, #24 in FY2024 and #21 in FY2025; new, not ranked in Jul 2024–Jun 2025.
21	Merrick & Company Top agencies USDA (Department of Agriculture)	$22,056,706	0.7%	Rank history: not on the FY2021–FY2024 lists and #16 in FY2025; up 70 since Jul 2024–Jun 2025.
22	Fors Marsh Group LLC Top agencies DHRA (Defense Human Resources Activity)	$20,727,800	0.7%	Rank history: not on the FY2021–FY2023 lists, #37 in FY2024 and #32 in FY2025; up 84 since Jul 2024–Jun 2025.
23	Lockheed Martin Corporation 4 awardees Top agencies USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$20,036,313	0.7%	Rank history: #26 in FY2021, #14 in FY2022, #31 in FY2023, #20 in FY2024 and #31 in FY2025; up 14 since Jul 2024–Jun 2025.
24	RMC 2021 LLC Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$19,153,280	0.6%	Rank history: #39 in FY2021, #15 in FY2022, #20 in FY2023, #29 in FY2024 and #22 in FY2025; down 1 since Jul 2024–Jun 2025.
25	Everfox LLC Top agencies USAF (Department of the Air Force)	$18,893,942	0.6%	Rank history: not on the FY2021–FY2024 lists and #24 in FY2025; up 28 since Jul 2024–Jun 2025.
26	Applied Enterprise Management Corporation Top agencies ED (Department of Education)	$16,827,069	0.5%	Rank history: not on the FY2021–FY2022 lists, #92 in FY2023, #30 in FY2024 and #74 in FY2025; up 10 since Jul 2024–Jun 2025.
27	Iqvia Government Solutions Inc Top agencies HHS (Department of Health and Human Services)	$16,535,434	0.5%	Rank history: not on the FY2021–FY2023 lists, #22 in FY2024 and #25 in FY2025; down 1 since Jul 2024–Jun 2025.
28	Asco Power Services Inc Through Schneider Electric Buildings Americas, Inc. Top agencies USAF (Department of the Air Force)	$16,172,397	0.5%	Rank history: not on the FY2021–FY2023 lists, #98 in FY2024 and #23 in FY2025; down 1 since Jul 2024–Jun 2025.
29	Rpi-Css, LLC Top agencies Commerce (Department of Commerce)	$15,315,627	0.5%	Rank history: not on the FY2021–FY2024 lists and #30 in FY2025; new, not ranked in Jul 2024–Jun 2025.
30	The Boeing Company 7 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$14,752,055	0.5%	Rank history: #31 in FY2021, #32 in FY2022, #56 in FY2023, #35 in FY2024 and not on the FY2025 list; up 28 since Jul 2024–Jun 2025.
31	Technomics Inc. Top agencies DOE (Department of Energy)	$14,741,049	0.5%	Rank history: not on the FY2021–FY2023 lists, #49 in FY2024 and #35 in FY2025; up 7 since Jul 2024–Jun 2025.
32	Noresco, LLC Top agencies EPA (Environmental Protection Agency) DHS (Department of Homeland Security) DOE (Department of Energy)	$14,468,548	0.5%	Rank history: not on the FY2021–FY2022 lists, #48 in FY2023, not on the FY2024 list and #41 in FY2025; up 13 since Jul 2024–Jun 2025.
33	Pavcon LLC Top agencies USAF (Department of the Air Force)	$13,872,591	0.5%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
34	General Dynamics Corporation 4 awardees, including General Dynamics Information Technology, Inc. and General Dynamics-Ots, Inc. Top agencies HHS (Department of Health and Human Services) EPA (Environmental Protection Agency) USAF (Department of the Air Force)	$13,789,544	0.4%	Rank history: #74 in FY2021, #40 in FY2022, #22 in FY2023, #33 in FY2024 and #44 in FY2025; up 12 since Jul 2024–Jun 2025.
35	Olgoonik Solutions LLC Top agencies DOS (Department of State)	$12,997,337	0.4%	Rank history: not on the FY2021–FY2023 lists, #99 in FY2024 and #38 in FY2025; up 43 since Jul 2024–Jun 2025.
36	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior) DOL (Department of Labor)	$12,839,120	0.4%	Rank history: #46 in FY2021, #52 in FY2022, #83 in FY2023, #51 in FY2024 and #46 in FY2025; up 46 since Jul 2024–Jun 2025.
37	Johnson Controls Government Systems, LLC Top agencies GSA (General Services Administration) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$12,591,561	0.4%	Rank history: not on the FY2021–FY2024 lists and #15 in FY2025; down 20 since Jul 2024–Jun 2025.
38	ASR Analytics, LLC Top agencies Treasury (Department of the Treasury)	$12,471,885	0.4%	Rank history: #35 in FY2021, #41 in FY2022, #39 in FY2023, #28 in FY2024 and #33 in FY2025; down 16 since Jul 2024–Jun 2025.
39	Tanaq Management Services LLC Top agencies HHS (Department of Health and Human Services)	$12,374,136	0.4%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2023, #72 in FY2024 and #67 in FY2025; up 32 since Jul 2024–Jun 2025.
40	The Brewer-Garrett Company Top agencies USAF (Department of the Air Force)	$12,235,000	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
41	Hdr, Inc. 3 awardees, including HDR Environmental, Operations and Construction, Inc. and HDR Engineering, Inc. Top agencies Navy (Department of the Navy)	$12,004,888	0.4%	Rank history: not on the FY2021–FY2023 lists, #39 in FY2024 and #37 in FY2025; down 6 since Jul 2024–Jun 2025.
42	Semanticbits LLC 3 awardees, including ICF Incorporated, L.L.C., Incentive Technology Group LLC and ICF Environmental, Inc. Top agencies EPA (Environmental Protection Agency) DOT (Department of Transportation) HHS (Department of Health and Human Services)	$11,875,445	0.4%	Rank history: not on the FY2021–FY2023 lists, #40 in FY2024 and #50 in FY2025; up 1 since Jul 2024–Jun 2025.
43	National Academy of Sciences Top agencies VA (Department of Veterans Affairs) OSD (Office of the Secretary of Defense) DOE (Department of Energy)	$11,691,259	0.4%	Rank history: #20 in FY2021, #24 in FY2022, #28 in FY2023, #31 in FY2024 and #53 in FY2025; down 9 since Jul 2024–Jun 2025.
44	Great Hill Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$11,650,469	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
45	Mccrone Associates Inc. Top agencies USAF (Department of the Air Force)	$10,672,279	0.3%	Rank history: not on the FY2021–FY2024 lists and #42 in FY2025; up 3 since Jul 2024–Jun 2025.
46	Emory University Top agencies HHS (Department of Health and Human Services)	$10,602,356	0.3%	Rank history: not on the FY2021 list, #46 in FY2022, #9 in FY2023, #58 in FY2024 and #34 in FY2025; down 6 since Jul 2024–Jun 2025.
47	Muscogee Staffing Solutions, LLC Top agencies USAF (Department of the Air Force)	$10,380,623	0.3%	Rank history: not on the FY2021–FY2024 lists and #48 in FY2025; new, not ranked in Jul 2024–Jun 2025.
48	Janus Research Group, LLC Top agencies Army (Department of the Army)	$10,079,747	0.3%	Rank history: #24 in FY2021, #19 in FY2022, #26 in FY2023, #36 in FY2024 and #36 in FY2025; down 15 since Jul 2024–Jun 2025.
49	Group W Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$10,016,003	0.3%	Rank history: #69 in FY2021, #93 in FY2022, not on the FY2023 list, #61 in FY2024 and #63 in FY2025; up 13 since Jul 2024–Jun 2025.
50	Advanced Regenerative Manufacturing Institute Inc. Top agencies HHS (Department of Health and Human Services)	$9,616,793	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
51	Tecolote Research, Inc. Top agencies OSD (Office of the Secretary of Defense)	$9,553,729	0.3%	Rank history: not on the FY2021–FY2022 lists, #62 in FY2023, #75 in FY2024 and #39 in FY2025; up 19 since Jul 2024–Jun 2025.
52	CEG Solutions LLC Top agencies GSA (General Services Administration)	$9,500,000	0.3%	Rank history: not on the FY2021–FY2024 lists and #3 in FY2025; down 48 since Jul 2024–Jun 2025.
53	New South Associates, Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior)	$9,450,962	0.3%	Rank history: #51 in FY2021, #59 in FY2022, #70 in FY2023, #60 in FY2024 and #43 in FY2025; up 14 since Jul 2024–Jun 2025.
54	Cherokee Insights LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$9,341,166	0.3%	Rank history: not on the FY2021–FY2022 lists, #46 in FY2023, #41 in FY2024 and #61 in FY2025; down 26 since Jul 2024–Jun 2025.
55	Hart Technologies, Inc. Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency)	$9,286,130	0.3%	Rank history: #55 in FY2021, not on the FY2022 list, #94 in FY2023, #64 in FY2024 and #56 in FY2025; up 2 since Jul 2024–Jun 2025.
56	Linquest Corporation Top agencies USAF (Department of the Air Force)	$9,249,586	0.3%	Rank history: not on the FY2021–FY2024 lists and #88 in FY2025; up 124 since Jul 2024–Jun 2025.
57	Universal Technical Resource Services Inc. Top agencies USAF (Department of the Air Force)	$9,135,021	0.3%	Rank history: not on the FY2021 list, #84 in FY2022, #82 in FY2023, #78 in FY2024 and #65 in FY2025; up 73 since Jul 2024–Jun 2025.
58	National Opinion Research Center Top agencies DHRA (Defense Human Resources Activity) NSF (National Science Foundation) HHS (Department of Health and Human Services)	$9,018,750	0.3%	Rank history: not on the FY2021 list, #50 in FY2022, #40 in FY2023, #38 in FY2024 and #47 in FY2025; down 8 since Jul 2024–Jun 2025.
59	Leidos Holdings, Inc. 5 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) WHS (DOD Washington Headquarters Service)	$8,988,159	0.3%	Rank history: #8 in FY2021, #17 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; up 402 since Jul 2024–Jun 2025.
60	Tierra Right of Way Services Ltd Top agencies DHS (Department of Homeland Security) DOI (Department of the Interior)	$8,945,899	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
61	Dawson Solutions LLC Top agencies DHS (Department of Homeland Security) USDA (Department of Agriculture)	$8,731,862	0.3%	Rank history: not on the FY2021–FY2024 lists and #64 in FY2025; up 202 since Jul 2024–Jun 2025.
62	Tetra Tech, Inc. 6 awardees Top agencies EPA (Environmental Protection Agency) DOE (Department of Energy)	$8,556,214	0.3%	Rank history: #42 in FY2021, #30 in FY2022, #27 in FY2023, #32 in FY2024 and #20 in FY2025; down 38 since Jul 2024–Jun 2025.
63	ECO & Associates, Inc. Top agencies DHS (Department of Homeland Security)	$8,393,259	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
64	University of California, Davis Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$8,032,616	0.3%	Rank history: not on the FY2021–FY2024 lists and #51 in FY2025; down 22 since Jul 2024–Jun 2025.
65	Veregy, LLC Top agencies Commerce (Department of Commerce)	$7,941,727	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
66	Pearson PLC Through NCS Pearson Inc. Top agencies ED (Department of Education)	$7,277,746	0.2%	Rank history: not on the FY2021–FY2025 lists; up 126 since Jul 2024–Jun 2025.
67	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$7,176,350	0.2%	Rank history: #57 in FY2021, #49 in FY2022, #38 in FY2023, #34 in FY2024 and #57 in FY2025; down 37 since Jul 2024–Jun 2025.
68	Atlantic States Marine Fisheries Commission Top agencies Commerce (Department of Commerce)	$7,000,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #59 in FY2025; new, not ranked in Jul 2024–Jun 2025.
69	Summit Consulting LLC Top agencies HUD (Department of Housing and Urban Development) DOL (Department of Labor)	$6,735,110	0.2%	Rank history: #61 in FY2021, #76 in FY2022, #76 in FY2023, not on the FY2024 list and #87 in FY2025; up 78 since Jul 2024–Jun 2025.
70	Honeywell International Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration) DOS (Department of State)	$6,566,804	0.2%	Rank history: #53 in FY2021, #60 in FY2022, #54 in FY2023, not on the FY2024 list and #18 in FY2025; down 51 since Jul 2024–Jun 2025.
71	The Medical College of Wisconsin, Inc. Top agencies HHS (Department of Health and Human Services)	$6,041,662	0.2%	Rank history: #78 in FY2021, #61 in FY2022, #77 in FY2023, #77 in FY2024 and #66 in FY2025; up 2 since Jul 2024–Jun 2025.
72	KPB Services LLC Top agencies DHS (Department of Homeland Security)	$5,944,948	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
73	Forrester Research, Inc. Top agencies USAF (Department of the Air Force) Commerce (Department of Commerce)	$5,838,711	0.2%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; up 102 since Jul 2024–Jun 2025.
74	Tuknik Government Services LLC Top agencies USAF (Department of the Air Force)	$5,637,200	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
75	Jacobs Government Services Company Through Jacobs Engineering Group Inc. Top agencies Army (Department of the Army)	$5,465,312	0.2%	Rank history: not on the FY2021–FY2023 lists, #79 in FY2024 and #71 in FY2025; up 5 since Jul 2024–Jun 2025.
76	Acumen LLC Top agencies HHS (Department of Health and Human Services)	$5,450,000	0.2%	Rank history: #32 in FY2021, #39 in FY2022, #43 in FY2023, #46 in FY2024 and #73 in FY2025; down 35 since Jul 2024–Jun 2025.
77	Excella, LLC Top agencies OPM (Office of Personnel Management)	$5,384,186	0.2%	Rank history: not on the FY2021–FY2023 lists, #53 in FY2024 and #54 in FY2025; down 23 since Jul 2024–Jun 2025.
78	Environmental Assessment Services, LLC Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$5,383,151	0.2%	Rank history: not on the FY2021–FY2024 lists and #86 in FY2025; up 259 since Jul 2024–Jun 2025.
79	Indewater LLC Top agencies USAF (Department of the Air Force)	$5,317,000	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
80	Ardl Inc. Top agencies Army (Department of the Army)	$5,154,214	0.2%	Rank history: not on the FY2021–FY2025 lists; up 162 since Jul 2024–Jun 2025.
81	The Potomac Institute for Policy Studies Top agencies USAF (Department of the Air Force)	$5,149,005	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
82	Information Management Services, Inc. Top agencies HHS (Department of Health and Human Services)	$5,140,327	0.2%	Rank history: #68 in FY2021, #64 in FY2022, #57 in FY2023, #67 in FY2024 and #78 in FY2025; down 6 since Jul 2024–Jun 2025.
83	Groundswell Corporation Top agencies DOT (Department of Transportation)	$5,073,623	0.2%	Rank history: not on the FY2021 list, #92 in FY2022, not on the FY2023 list, #66 in FY2024 and #82 in FY2025; down 15 since Jul 2024–Jun 2025.
84	Dawson Mcg, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$5,046,768	0.2%	Rank history: not on the FY2021–FY2024 lists and #81 in FY2025; new, not ranked in Jul 2024–Jun 2025.
85	LMI Consulting, LLC Top agencies USAF (Department of the Air Force) HHS (Department of Health and Human Services)	$5,042,711	0.2%	Rank history: not on the FY2021–FY2025 lists; up 106 since Jul 2024–Jun 2025.
86	Teledyne Technologies Incorporated Through Teledyne Brown Engineering, Inc. Top agencies USAF (Department of the Air Force)	$4,989,078	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
87	Neptune and Company, Incorporated Top agencies DOE (Department of Energy)	$4,980,197	0.2%	Rank history: not on the FY2021–FY2024 lists and #100 in FY2025; up 34 since Jul 2024–Jun 2025.
88	Bluefoot Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$4,887,303	0.2%	Rank history: not on the FY2021–FY2024 lists and #70 in FY2025; down 13 since Jul 2024–Jun 2025.
89	The Broad Institute, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$4,854,557	0.2%	Rank history: #22 in FY2021, #35 in FY2022, not on the FY2023 list, #25 in FY2024 and not on the FY2025 list; down 69 since Jul 2024–Jun 2025.
90	Gryphon Technologies L.C. Top agencies USAF (Department of the Air Force)	$4,835,549	0.2%	Rank history: not on the FY2021–FY2024 lists and #85 in FY2025; up 4 since Jul 2024–Jun 2025.
91	Trane U.s. Inc. Top agencies USAF (Department of the Air Force) GSA (General Services Administration)	$4,803,015	0.2%	Rank history: not on the FY2021–FY2024 lists and #93 in FY2025; up 10 since Jul 2024–Jun 2025.
92	S C & A Inc. Top agencies DOI (Department of the Interior) DOE (Department of Energy) NRC (Nuclear Regulatory Commission)	$4,704,899	0.2%	Rank history: not on the FY2021–FY2024 lists and #68 in FY2025; up 53 since Jul 2024–Jun 2025.
93	Concurrent Technologies Corp Top agencies USAF (Department of the Air Force)	$4,535,634	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
94	The Precision Group, LLC Top agencies DOJ (Department of Justice)	$4,471,426	0.1%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2023, not on the FY2024 list and #77 in FY2025; up 5 since Jul 2024–Jun 2025.
95	Decision Information Resources, Inc. Top agencies ED (Department of Education)	$4,465,346	0.1%	Rank history: not on the FY2021–FY2024 lists and #95 in FY2025; new, not ranked in Jul 2024–Jun 2025.
96	Redhorse Corporation Top agencies USAF (Department of the Air Force)	$4,458,661	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
97	CVS Health Corporation Through CVS Healthspire Payor & Life Sciences LLC Top agencies HHS (Department of Health and Human Services)	$4,439,747	0.1%	Rank history: #66 in FY2021, #75 in FY2022, #84 in FY2023, not on the FY2024 list and #62 in FY2025; up 147 since Jul 2024–Jun 2025.
98	Consolidated Safety Services Incorporated Top agencies EPA (Environmental Protection Agency) DOI (Department of the Interior)	$4,402,987	0.1%	Rank history: #94 in FY2021, not on the FY2022–FY2024 lists and #76 in FY2025; up 42 since Jul 2024–Jun 2025.
99	Source Healthcare Analytics LLC Top agencies HHS (Department of Health and Human Services)	$4,378,960	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Jul 2024–Jun 2025.
100	Frontier Technology Inc. Top agencies Navy (Department of the Navy)	$4,315,631	0.1%	Rank history: not on the FY2021–FY2024 lists and #89 in FY2025; up 124 since Jul 2024–Jun 2025.

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100 of 1,686 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC B

Code	Net obligations	Largest contractor
B5 Special Studies – Not R&D	$2,476,129,883	Parsons Corporation

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 $3.07 billion 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Jul 2024–Jun 2025. "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.
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 PSC B contractors in Jul 2025–Jun 2026?

1. Parsons Corporation ($172M), 2. Johns Hopkins University ($142M), 3. The Rand Corporation ($124M), 4. Booz Allen Hamilton Holding Corporation ($113M), 5. The CNA Corporation ($98.3M), 6. Research Triangle Institute ($74.4M), 7. Deloitte ($55.9M), 8. Ameresco Inc. ($48.9M), 9. Educational Testing Service ($46.2M), 10. Guidehouse Inc. ($40.7M).

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