Top 31 Contractors in NAICS 9281: National Security and International Affairs, Aug 2025–Jul 2026

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	American Institute In Taiwan Top agencies DOS (Department of State)	$45,242,057	60.6%	Rank history: #2 in FY2021, #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since Aug 2024–Jul 2025.
2	International Organization for Migration Top agencies DHS (Department of Homeland Security)	$4,046,738	5.4%	Rank history: not on the FY2021–FY2023 lists, #2 in FY2024 and #2 in FY2025; unchanged since Aug 2024–Jul 2025.
3	Brown International Corporation Top agencies USAF (Department of the Air Force)	$612,485	0.8%	Rank history: #9 in FY2021, not on the FY2022–FY2023 lists, #4 in FY2024 and #3 in FY2025; unchanged since Aug 2024–Jul 2025.
4	Raven Advisory LLC Top agencies DHS (Department of Homeland Security)	$582,792	0.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
5	Stellar Science Ltd. Co. Top agencies USAF (Department of the Air Force)	$375,000	0.5%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2023, #3 in FY2024 and #4 in FY2025; down 1 since Aug 2024–Jul 2025.
6	Trustwave Government Solutions LLC Top agencies National Gallery of Art	$340,481	0.5%	Rank history: not on the FY2021–FY2023 lists, #7 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
7	Khalid B Simaan Top agencies Treasury (Department of the Treasury)	$266,724	0.4%	Rank history: #31 in FY2021, #30 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
8	Ishikawa Linda J Top agencies Treasury (Department of the Treasury)	$174,683	0.2%	Rank history: #59 in FY2021, #50 in FY2022, #26 in FY2023, #19 in FY2024 and #11 in FY2025; up 2 since Aug 2024–Jul 2025.
9	UEI L7HXSKF1R545 Top agencies Treasury (Department of the Treasury)	$174,631	0.2%	Rank history: #86 in FY2021, not on the FY2022 list, #33 in FY2023, #18 in FY2024 and #9 in FY2025; up 12 since Aug 2024–Jul 2025.
10	Egbert Warner Ospina Top agencies Treasury (Department of the Treasury)	$162,740	0.2%	Rank history: not on the FY2021–FY2024 lists and #12 in FY2025; up 2 since Aug 2024–Jul 2025.
11	Teresa A Cochran Top agencies Treasury (Department of the Treasury)	$146,067	0.2%	Rank history: #80 in FY2021, #74 in FY2022, #46 in FY2023, #34 in FY2024 and #18 in FY2025; up 7 since Aug 2024–Jul 2025.
12	Kofmehl Associates LLC Top agencies Treasury (Department of the Treasury)	$141,029	0.2%	Rank history: not on the FY2021–FY2024 lists and #21 in FY2025; new, not ranked in Aug 2024–Jul 2025.
13	Thomas Benjamin Gilmer Top agencies Treasury (Department of the Treasury)	$137,758	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
14	L3Harris Technologies, Inc. Top agencies DOE (Department of Energy)	$135,000	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
15	International Law Institute Top agencies DOS (Department of State)	$131,596	0.2%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2023, #20 in FY2024 and #20 in FY2025; down 4 since Aug 2024–Jul 2025.
16	Eric Richard Tremont Top agencies Treasury (Department of the Treasury)	$93,552	0.1%	Rank history: not on the FY2021 list, #89 in FY2022, #43 in FY2023, #23 in FY2024 and not on the FY2025 list; up 24 since Aug 2024–Jul 2025.
17	UEI HVM5WCUT74J3 Top agencies Treasury (Department of the Treasury)	$89,151	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
18	UEI CW4GS4AX9HV6 Top agencies Treasury (Department of the Treasury)	$82,954	0.1%	Rank history: not on the FY2021–FY2024 lists and #34 in FY2025; up 17 since Aug 2024–Jul 2025.
19	UEI VAUET2VGTA29 Top agencies Treasury (Department of the Treasury)	$79,150	0.1%	Rank history: not on the FY2021–FY2024 lists and #19 in FY2025; new, not ranked in Aug 2024–Jul 2025.
20	UEI YXJ1FNWHJJQ3 Top agencies Treasury (Department of the Treasury)	$74,626	0.1%	Rank history: not on the FY2021–FY2024 lists and #22 in FY2025; new, not ranked in Aug 2024–Jul 2025.
21	UEI KGHNSLW862W7 Top agencies Treasury (Department of the Treasury)	$67,342	0.1%	Rank history: #27 in FY2021, #44 in FY2022, #49 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
22	Mainwaring, Donald Top agencies Treasury (Department of the Treasury)	$59,510	0.1%	Rank history: not on the FY2021–FY2023 lists, #52 in FY2024 and #23 in FY2025; new, not ranked in Aug 2024–Jul 2025.
23	UEI HRVBCVVV4PP8 Top agencies Treasury (Department of the Treasury)	$54,235	0.1%	Rank history: not on the FY2021–FY2023 lists, #50 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
24	UEI WXXYV4ZTNNW5 Top agencies Treasury (Department of the Treasury)	$40,770	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
25	Gene S Evenskaas Top agencies Treasury (Department of the Treasury)	$20,492	<0.1%	Rank history: not on the FY2021–FY2023 lists, #74 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
26	UEI E7QXACXYVP18 Top agencies Treasury (Department of the Treasury)	$12,262	<0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
27	William S. Hein & Co., Inc.	$12,096	<0.1%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; up 7 since Aug 2024–Jul 2025.
28	Lamar, Nathan Scott Top agencies Commerce (Department of Commerce)	$6,326	<0.1%	Rank history: not on the FY2021–FY2024 lists and #41 in FY2025; new, not ranked in Aug 2024–Jul 2025.
29	Florida Department of Commerce Top agencies DHS (Department of Homeland Security)	$6,050	<0.1%	Rank history: not on the FY2021–FY2023 lists, #75 in FY2024 and not on the FY2025 list; up 12 since Aug 2024–Jul 2025.
30	Government of Canada Top agencies DOI (Department of the Interior)	$5,000	<0.1%	Rank history: not on the FY2021–FY2024 lists and #43 in FY2025; up 14 since Aug 2024–Jul 2025.
31	Lockmasters Inc. Top agencies USAF (Department of the Air Force)	$653	<0.1%	Rank history: not on the FY2021–FY2024 lists and #46 in FY2025; new, not ranked in Aug 2024–Jul 2025.

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 $74.7 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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 Aug 2024–Jul 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