Top 46 Contractors in NAICS 9281: National Security and International Affairs, FY2025

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	American Institute In Taiwan Top agencies DOS (Department of State)	$39,447,994	56.2%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023 and #1 in FY2024; unchanged since FY2024.
2	International Organization for Migration Top agencies DHS (Department of Homeland Security)	$6,000,000	8.6%	Rank history: not on the FY2021–FY2023 lists and #2 in FY2024; unchanged since FY2024.
3	Brown International Corporation Top agencies USAF (Department of the Air Force)	$3,335,285	4.8%	Rank history: #9 in FY2021, not on the FY2022–FY2023 lists and #4 in FY2024; up 1 since FY2024.
4	Stellar Science Ltd. Co. Top agencies USAF (Department of the Air Force)	$633,278	0.9%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2023 and #3 in FY2024; down 1 since FY2024.
5	UEI F7CWBPRVVZS8 Top agencies Treasury (Department of the Treasury)	$288,995	0.4%	Rank history: #16 in FY2021, #38 in FY2022, #12 in FY2023 and #10 in FY2024; up 5 since FY2024.
6	Lanier, Thomas Top agencies Treasury (Department of the Treasury)	$249,653	0.4%	Rank history: #15 in FY2021, #40 in FY2022, #19 in FY2023 and #8 in FY2024; up 2 since FY2024.
7	Bloomberg Finance LP Top agencies DHS (Department of Homeland Security)	$226,960	0.3%	Rank history: not on the FY2021–FY2023 lists and #16 in FY2024; up 9 since FY2024.
8	Nichola F Fluehr-Lobban Top agencies Treasury (Department of the Treasury)	$207,071	0.3%	Rank history: #34 in FY2021, #32 in FY2022, #18 in FY2023 and #12 in FY2024; up 4 since FY2024.
9	UEI L7HXSKF1R545 Top agencies Treasury (Department of the Treasury)	$198,208	0.3%	Rank history: #86 in FY2021, not on the FY2022 list, #33 in FY2023 and #18 in FY2024; up 9 since FY2024.
10	Hein, William Top agencies Treasury (Department of the Treasury)	$198,110	0.3%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; up 7 since FY2024.
11	Ishikawa Linda J Top agencies Treasury (Department of the Treasury)	$173,924	0.2%	Rank history: #59 in FY2021, #50 in FY2022, #26 in FY2023 and #19 in FY2024; up 8 since FY2024.
12	Egbert Warner Ospina Top agencies Treasury (Department of the Treasury)	$154,735	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
13	Randolph Dana Top agencies Treasury (Department of the Treasury)	$154,101	0.2%	Rank history: #65 in FY2021, #48 in FY2022, #28 in FY2023 and #22 in FY2024; up 9 since FY2024.
14	Michael Joseph Fox JR Top agencies Treasury (Department of the Treasury)	$153,033	0.2%	Rank history: #70 in FY2021, #56 in FY2022, #31 in FY2023 and #25 in FY2024; up 11 since FY2024.
15	Zebara LLC Top agencies USAF (Department of the Air Force)	$150,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2023 and #21 in FY2024; up 6 since FY2024.
16	UEI KV33NPNWZYC9 Top agencies Treasury (Department of the Treasury)	$118,675	0.2%	Rank history: #63 in FY2021, #86 in FY2022, #67 in FY2023 and #51 in FY2024; up 35 since FY2024.
17	Dynamic Security Solutions LLC Top agencies DOS (Department of State)	$104,980	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
18	Teresa A Cochran Top agencies Treasury (Department of the Treasury)	$102,439	0.1%	Rank history: #80 in FY2021, #74 in FY2022, #46 in FY2023 and #34 in FY2024; up 16 since FY2024.
19	UEI VAUET2VGTA29 Top agencies Treasury (Department of the Treasury)	$79,150	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
20	International Law Institute Top agencies DOS (Department of State)	$77,462	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023 and #20 in FY2024; unchanged since FY2024.
21	Kofmehl Associates LLC Top agencies Treasury (Department of the Treasury)	$76,844	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
22	UEI YXJ1FNWHJJQ3 Top agencies Treasury (Department of the Treasury)	$74,626	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
23	Mainwaring, Donald Top agencies Treasury (Department of the Treasury)	$59,510	0.1%	Rank history: not on the FY2021–FY2023 lists and #52 in FY2024; up 29 since FY2024.
24	UEI CP3AUXZ11KJ3 Top agencies Treasury (Department of the Treasury)	$36,039	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
25	UEI LX2FGLX5WMD5 Top agencies Treasury (Department of the Treasury)	$35,542	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
26	Olson, Craig T Top agencies Treasury (Department of the Treasury)	$33,126	<0.1%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2023 and #26 in FY2024; unchanged since FY2024.
27	Daniel Thomas Riordan Top agencies Treasury (Department of the Treasury)	$32,311	<0.1%	Rank history: not on the FY2021–FY2023 lists and #62 in FY2024; up 35 since FY2024.
28	Vasquez, Javier Gustavo Top agencies Treasury (Department of the Treasury)	$30,734	<0.1%	Rank history: #94 in FY2021, #84 in FY2022, #61 in FY2023 and #36 in FY2024; up 8 since FY2024.
29	UEI SX8GCBH23RK5 Top agencies Treasury (Department of the Treasury)	$21,711	<0.1%	Rank history: not on the FY2021–FY2023 lists and #44 in FY2024; up 15 since FY2024.
30	Margaret M Gavaghan Top agencies Treasury (Department of the Treasury)	$19,267	<0.1%	Rank history: #91 in FY2021, #71 in FY2022, #68 in FY2023 and #28 in FY2024; down 2 since FY2024.
31	Jeffrey Todd Cooper Top agencies Treasury (Department of the Treasury)	$16,773	<0.1%	Rank history: not on the FY2021–FY2023 lists and #13 in FY2024; down 18 since FY2024.
32	UEI RGNXT8744VK4 Top agencies Treasury (Department of the Treasury)	$12,304	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
33	William S. Hein & Co., Inc.	$12,096	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
34	UEI CW4GS4AX9HV6 Top agencies Treasury (Department of the Treasury)	$10,948	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
35	UEI Y2YATPR1HDU3 Top agencies Treasury (Department of the Treasury)	$10,357	<0.1%	Rank history: not on the FY2021–FY2023 lists and #83 in FY2024; up 48 since FY2024.
36	UEI NW3QCZ16USC6 Top agencies Treasury (Department of the Treasury)	$9,154	<0.1%	Rank history: not on the FY2021–FY2022 lists, #90 in FY2023 and not on the FY2024 list; returned.
37	Bryan K Barnett Top agencies Treasury (Department of the Treasury)	$8,947	<0.1%	Rank history: #76 in FY2021, not on the FY2022 list, #29 in FY2023 and #24 in FY2024; down 13 since FY2024.
38	UEI YU3QE7NZNPQ3 Top agencies Treasury (Department of the Treasury)	$8,602	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
39	Florida Department of Commerce Top agencies DHS (Department of Homeland Security)	$8,401	<0.1%	Rank history: not on the FY2021–FY2023 lists and #75 in FY2024; up 36 since FY2024.
40	Resolve Marine Group Inc. Top agencies DHS (Department of Homeland Security)	$7,763	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
41	Lamar, Nathan Scott Top agencies Commerce (Department of Commerce)	$6,326	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
42	Barbara N Opper Top agencies Treasury (Department of the Treasury)	$5,330	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
43	Government of Canada Top agencies DOI (Department of the Interior)	$5,000	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
44	Gendron Amanda Chapman Top agencies Treasury (Department of the Treasury)	$1,202	<0.1%	Rank history: #100 in FY2021, #83 in FY2022, #62 in FY2023 and #42 in FY2024; down 2 since FY2024.
45	State of California Employment Development Department Top agencies DHS (Department of Homeland Security)	$933	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
46	Lockmasters Inc. Top agencies USAF (Department of the Air Force)	$653	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.

Rankings for the codes under NAICS 9281

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 $70.1 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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