Top 100 Contractors in NAICS 488: Support Activities for Transportation, FY2021

Name: Top 100 Contractors in NAICS 488: Support Activities for Transportation, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 55% of FY2021 NAICS 488 contract dollars

Contract obligations: $8,350,867,894 Net of deobligations, by contracts coded NAICS 488 or a code under it
Contractors: 1,582 Parent companies with an obligation
Largest contractor: Amentum Services, Inc. $826 million, 9.2% 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	Amentum Services, Inc. 2 awardees, including Dyncorp International LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$826,449,466	9.2%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and not on the FY2025 list; up 78 since FY2020.
2	M1 Support Services, L.P. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$783,684,112	8.7%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; unchanged since FY2020.
3	Vertex Aerospace LLC 4 awardees, including V2X Aerospace LLC and Crestview Aerospace LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DCMA (Defense Contract Management Agency)	$748,361,437	8.3%	Rank history: #2 in FY2022, #2 in FY2023, #24 in FY2024 and not on the FY2025 list; up 1 since FY2020.
4	RTX Corporation 24 awardees, including Rockwell Collins, Inc., Goodrich Corporation and Simmonds Precision Products Inc. Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$564,364,555	6.3%	Rank history: #6 in FY2022, #5 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
5	Remington Arms Company LLC Through Dyncorp International LLC Top agencies Army (Department of the Army) Navy (Department of the Navy) DCMA (Defense Contract Management Agency)	$460,521,473	5.1%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
6	Leidos Holdings, Inc. 3 awardees, including Leidos, Inc. Top agencies Army (Department of the Army) DOT (Department of Transportation)	$411,886,762	4.6%	Rank history: #42 in FY2022, #34 in FY2023, #28 in FY2024 and #22 in FY2025; unchanged since FY2020.
7	Northrop Grumman Corporation 14 awardees, including Northrop Grumman Systems Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) NASA (National Aeronautics and Space Administration)	$348,832,087	3.9%	Rank history: #4 in FY2022, #4 in FY2023, #13 in FY2024 and #11 in FY2025; down 2 since FY2020.
8	Aarcorp 5 awardees, including AAR Government Services, Inc., AAR Aircraft Services, Inc. and AAR Allen Services, Inc. Top agencies DOS (Department of State) DOE (Department of Energy) USAF (Department of the Air Force)	$297,659,535	3.3%	Rank history: #9 in FY2022, #9 in FY2023, #23 in FY2024 and not on the FY2025 list; up 4 since FY2020.
9	The Boeing Company 13 awardees, including Boeing Sikorsky Aircraft Support, LLC, Boeing Aerospace Operations, Inc. and Tapestry Solutions, Inc. Top agencies USAF (Department of the Air Force) USSOCOM (United States Special Operations Command) Navy (Department of the Navy)	$274,985,631	3.1%	Rank history: #5 in FY2022, #7 in FY2023, #8 in FY2024 and #6 in FY2025; up 1 since FY2020.
10	IAP Global Services LLC 2 awardees, including Jpats Logistics Services, LLC and IAP Worldwide Services, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$237,548,871	2.6%	Rank history: #10 in FY2022, #10 in FY2023, #14 in FY2024 and not on the FY2025 list; down 3 since FY2020.
11	Airbus Americas Inc. 4 awardees, including Airbus US Space & Defense Inc., Airbus Helicopters, Inc. and Airbus DS Military Aircraft, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) Navy (Department of the Navy)	$227,608,571	2.5%	Rank history: #8 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
12	PAE Government Services Inc. 2 awardees, including PAE Aviation and Technical Services LLC Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) USAF (Department of the Air Force)	$217,793,837	2.4%	Rank history: #14 in FY2022, #23 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
13	International Auto Logistics, LLC Top agencies Army (Department of the Army) USTRANSCOM (Department of Defense United States Transportation Command)	$157,851,156	1.8%	Rank history: #12 in FY2022, #12 in FY2023, #9 in FY2024 and #12 in FY2025; unchanged since FY2020.
14	Calista Corp 3 awardees, including Yulista Support Services LLC, Yulista Tactical Services LLC and Y-Tech Services, Inc. Top agencies Army (Department of the Army) NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$140,365,385	1.6%	Rank history: #11 in FY2022, #14 in FY2023, #50 in FY2024 and not on the FY2025 list; up 6 since FY2020.
15	Lockheed Martin Corporation 7 awardees, including Sikorsky Aircraft Corporation and Derco Aerospace, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DOJ (Department of Justice)	$107,194,576	1.2%	Rank history: #13 in FY2022, #13 in FY2023, #16 in FY2024 and #14 in FY2025; up 73 since FY2020.
16	Sierra Nevada Company, LLC 2 awardees Top agencies USAF (Department of the Air Force)	$103,556,085	1.1%	Rank history: #17 in FY2022, #17 in FY2023, #30 in FY2024 and #30 in FY2025; up 5 since FY2020.
17	Crowley Government Services Inc. 3 awardees, including Crowley Logistics, Inc. and Crowley Marine Services, Inc. Top agencies OSD (Office of the Secretary of Defense) HHS (Department of Health and Human Services) USTRANSCOM (Department of Defense United States Transportation Command)	$100,077,934	1.1%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
18	V2X, Inc. Through V2X Aerospace LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DCMA (Defense Contract Management Agency)	$91,263,427	1.0%	Rank history: not on the FY2022–FY2023 lists, #2 in FY2024 and #2 in FY2025; down 9 since FY2020.
19	General Atomic Technologies Corporation Through General Atomics Aeronautical Systems, Inc. Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$87,767,483	1.0%	Rank history: #15 in FY2022, #15 in FY2023, #59 in FY2024 and not on the FY2025 list; up 13 since FY2020.
20	Tyonek Native Corporatio 3 awardees, including Tyonek Services Overhaul Facility-Stennis, LLC and Tyonek Global Services LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$85,440,650	0.9%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
21	Kay and Associates, Inc. Top agencies Navy (Department of the Navy)	$83,742,932	0.9%	Rank history: #19 in FY2022, #22 in FY2023, #46 in FY2024 and #17 in FY2025; up 5 since FY2020.
22	Pinnacle Solutions, LLC Top agencies Army (Department of the Army)	$80,152,281	0.9%	Rank history: not on the FY2022–FY2025 lists; up 350 since FY2020.
23	Robinson Aviation (Rva), Inc. Top agencies DOT (Department of Transportation)	$65,742,590	0.7%	Rank history: #20 in FY2022, #20 in FY2023, #21 in FY2024 and #18 in FY2025; unchanged since FY2020.
24	S & K Aerospace, LLC Top agencies USAF (Department of the Air Force)	$65,405,706	0.7%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
25	Patriarch Partners LLC Through MD Helicopters Inc. Top agencies Army (Department of the Army)	$62,837,618	0.7%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
26	Midwest Air Traffic Control Service Inc. Top agencies DOT (Department of Transportation) Navy (Department of the Navy)	$55,052,546	0.6%	Rank history: #22 in FY2022, #21 in FY2023, #25 in FY2024 and #21 in FY2025; down 2 since FY2020.
27	Airborne Tactical Advantage Co LLC Top agencies Navy (Department of the Navy)	$51,854,314	0.6%	Rank history: #18 in FY2022, #28 in FY2023 and not on the FY2024–FY2025 lists; up 211 since FY2020.
28	Avmac LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$51,527,382	0.6%	Rank history: #21 in FY2022, not on the FY2023–FY2024 lists and #82 in FY2025; unchanged since FY2020.
29	Nana Regional Corporation Inc 3 awardees, including Akima Logistics Services LLC, Lockwood Hills Federal LLC and Akima Support Operations, LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$49,171,315	0.5%	Rank history: #25 in FY2022, #25 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
30	Global Pcci (Gpc) Top agencies Navy (Department of the Navy)	$47,982,818	0.5%	Rank history: #24 in FY2022, #26 in FY2023, #44 in FY2024 and #25 in FY2025; down 5 since FY2020.
31	Air Transport International Inc. Top agencies Army (Department of the Army)	$45,328,374	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Textron Inc. 6 awardees, including Textron Systems Corporation, Textron Aviation Inc. and Able Aerospace Services, Inc. Top agencies USAF (Department of the Air Force) USDA (Department of Agriculture) DHS (Department of Homeland Security)	$44,416,955	0.5%	Rank history: #57 in FY2022, #39 in FY2023, #22 in FY2024 and #20 in FY2025; down 5 since FY2020.
33	Maersk Inc. 2 awardees, including Farrell Lines Incorporated and Maersk Line, Limited Top agencies Army (Department of the Army)	$42,167,293	0.5%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; up 44 since FY2020.
34	Serco North America (Holdings) Inc 2 awardees, including Serco Inc. Top agencies DOT (Department of Transportation) USAF (Department of the Air Force)	$37,878,993	0.4%	Rank history: #26 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
35	MLS-Multinational Logistic Services Limited Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$37,274,588	0.4%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
36	L3Harris Technologies, Inc. 10 awardees, including L3Harris Technologies Integrated Systems L.P., Wescam Inc. and CAE USA Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$34,938,045	0.4%	Rank history: #48 in FY2022, #85 in FY2023, #52 in FY2024 and #32 in FY2025; up 13 since FY2020.
37	Omega Aerial Refueling Services, Inc. Top agencies Navy (Department of the Navy)	$32,813,100	0.4%	Rank history: #36 in FY2022, #27 in FY2023, #34 in FY2024 and #29 in FY2025; down 3 since FY2020.
38	Seaward Marine Services, LLC Top agencies Navy (Department of the Navy)	$31,403,549	0.3%	Rank history: #28 in FY2022, #53 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
39	S.C.A. - Shipping Consultants Associated Ltd. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) Army (Department of the Army)	$26,814,664	0.3%	Rank history: #16 in FY2022, #18 in FY2023, #19 in FY2024 and #16 in FY2025; up 11 since FY2020.
40	BLG Autoterminal Bremerhaven GMBH & CO.KG Top agencies Army (Department of the Army)	$24,265,106	0.3%	Rank history: #63 in FY2022 and not on the FY2023–FY2025 lists; up 56 since FY2020.
41	VT Milcom Inc. Through National Technologies Associates, Inc. Top agencies Navy (Department of the Navy)	$23,704,464	0.3%	Rank history: #53 in FY2022, #56 in FY2023, #98 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
42	Korean Air Lines Co.,Ltd. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) DCMA (Defense Contract Management Agency)	$23,510,313	0.3%	Rank history: #31 in FY2022, #35 in FY2023, #31 in FY2024 and #41 in FY2025; up 15 since FY2020.
43	Kbr, Inc. 2 awardees, including KBR Wyle Services, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$21,681,283	0.2%	Rank history: #39 in FY2022, #48 in FY2023, #81 in FY2024 and not on the FY2025 list; up 11 since FY2020.
44	Donjon Marine Co., LLC Top agencies Navy (Department of the Navy)	$19,649,118	0.2%	Rank history: #55 in FY2022, #43 in FY2023, #27 in FY2024 and not on the FY2025 list; up 21 since FY2020.
45	SAFRAN 9 awardees, including Safran Helicopter Engines Usa, Inc., Safran Electronics & Defense, Avionics Usa, LLC and Safran Aerosystems Services Americas LLC Top agencies DHS (Department of Homeland Security) DOT (Department of Transportation) DLA (Defense Logistics Agency)	$18,860,110	0.2%	Rank history: #45 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
46	Alpha Marine Services LLC Top agencies Navy (Department of the Navy)	$18,079,640	0.2%	Rank history: #37 in FY2022, #45 in FY2023, #51 in FY2024 and #38 in FY2025; up 34 since FY2020.
47	Dyncorp International LLC Top agencies Navy (Department of the Navy) DCMA (Defense Contract Management Agency)	$17,832,897	0.2%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
48	Spartan Iraq LLC Top agencies USAF (Department of the Air Force)	$17,705,796	0.2%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; down 18 since FY2020.
49	Rolls-Royce Military Aero Engines Ltd 2 awardees, including Rolls-Royce Corporation and Rolls-Royce Deutschland Ltd & Co KG Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice) DOT (Department of Transportation)	$17,148,360	0.2%	Rank history: #90 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
50	American President Lines Ltd. 2 awardees, including Circle Freight International - Bahrain Co. W.l.l Top agencies Army (Department of the Army) Navy (Department of the Navy) DHS (Department of Homeland Security)	$15,709,858	0.2%	Rank history: not on the FY2022–FY2025 lists; up 51 since FY2020.
51	PAE Aviation and Technical Services LLC Top agencies DHS (Department of Homeland Security)	$15,577,794	0.2%	Rank history: not on the FY2022–FY2025 lists; down 36 since FY2020.
52	Louis Berger U.S. Inc. Through VGS Aircraft Services, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$15,536,106	0.2%	Rank history: #40 in FY2022, #57 in FY2023, #62 in FY2024 and not on the FY2025 list; up 76 since FY2020.
53	Arctic Slope Regional Corporation 2 awardees, including Primus Solutions, LLC and Asrc Federal Facilities Logistics, LLC Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$14,485,668	0.2%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
54	Nippi Corporation Top agencies Navy (Department of the Navy)	$13,967,170	0.2%	Rank history: #44 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
55	Amerijet International Inc. Top agencies Army (Department of the Army)	$13,419,759	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	PKL Services, Inc. Top agencies USAF (Department of the Air Force)	$12,773,600	0.1%	Rank history: #34 in FY2022, #44 in FY2023, #49 in FY2024 and #48 in FY2025; unchanged since FY2020.
57	Versability Resources, Inc. Top agencies Navy (Department of the Navy)	$12,725,812	0.1%	Rank history: #30 in FY2022, #41 in FY2023, #48 in FY2024 and #44 in FY2025; down 6 since FY2020.
58	Koninklijke Boskalis Westminster N.V. 2 awardees, including Smit Salvage Americas, LLC Top agencies Navy (Department of the Navy)	$11,259,280	0.1%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; up 72 since FY2020.
59	Northrop Grumman Systems Corporation Top agencies USAF (Department of the Air Force)	$10,959,435	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Global Defense Logistics S.R.L. Top agencies Navy (Department of the Navy) Army (Department of the Army) DHS (Department of Homeland Security)	$10,952,062	0.1%	Rank history: #27 in FY2022, #38 in FY2023, #42 in FY2024 and #53 in FY2025; up 1 since FY2020.
61	American Roll-on Roll-Off Carrier LLC 3 awardees, including Transcar GMBH and American Roll-On Roll-Off Carrier Group, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$10,711,196	0.1%	Rank history: not on the FY2022 list, #58 in FY2023, #89 in FY2024 and not on the FY2025 list; up 127 since FY2020.
62	National Air Cargo, Inc. 2 awardees, including National Air Cargo Group, Inc. Top agencies Army (Department of the Army)	$10,527,534	0.1%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; up 52 since FY2020.
63	Triad Logistics Services Corporation Top agencies USAF (Department of the Air Force)	$10,243,775	0.1%	Rank history: #65 in FY2022, #63 in FY2023, #84 in FY2024 and #66 in FY2025; up 12 since FY2020.
64	Bollore Transport & Logi 2 awardees, including Africa Global Logistics Mocambique, S.A and Bollore Transport & Logistics RDC SA Top agencies USAID (US Agency for International Development) DOS (Department of State)	$10,026,120	0.1%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
65	Government of Canada Through Canadian Commercial Corporation Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$9,037,096	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	De La Fuente Construction, Inc. Top agencies Navy (Department of the Navy)	$8,832,940	0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 78 since FY2020.
67	Great Eastern Group, Inc. Top agencies Navy (Department of the Navy)	$8,764,379	0.1%	Rank history: #69 in FY2022, #66 in FY2023, #79 in FY2024 and #85 in FY2025; up 43 since FY2020.
68	SSA Atlantic LLC Top agencies Army (Department of the Army)	$8,664,237	0.1%	Rank history: #82 in FY2022, #75 in FY2023, #74 in FY2024 and #62 in FY2025; new, not ranked in FY2020.
69	Calspan Corporation Top agencies USAF (Department of the Air Force)	$8,605,349	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; up 202 since FY2020.
70	Cooper / Ports America LLC Top agencies Army (Department of the Army)	$8,431,048	0.1%	Rank history: #46 in FY2022 and not on the FY2023–FY2025 lists; down 35 since FY2020.
71	Metson Marine Inc. Through Metson Marine Services, Inc. Top agencies Navy (Department of the Navy)	$8,384,958	0.1%	Rank history: #61 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
72	Algese S.R.L. Top agencies USAF (Department of the Air Force)	$8,190,509	0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
73	Moran Transportation Company 2 awardees, including Moran Towing Corporation Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$7,818,846	0.1%	Rank history: #54 in FY2022, #49 in FY2023, #53 in FY2024 and #56 in FY2025; up 21 since FY2020.
74	Portus Services LLC Top agencies Army (Department of the Army)	$7,615,256	0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
75	Subaru Corporation Top agencies Navy (Department of the Navy) DCMA (Defense Contract Management Agency)	$7,583,882	0.1%	Rank history: #62 in FY2022, #67 in FY2023, #94 in FY2024 and not on the FY2025 list; up 97 since FY2020.
76	Aero Precision & Repair Overhaul Company, Inc. Top agencies DHS (Department of Homeland Security)	$7,541,658	0.1%	Rank history: #59 in FY2022, not on the FY2023–FY2024 lists and #77 in FY2025; up 21 since FY2020.
77	Marshall of Cambridge Aerospace Limited Top agencies Navy (Department of the Navy)	$7,444,614	0.1%	Rank history: #38 in FY2022, #65 in FY2023, #45 in FY2024 and #43 in FY2025; up 243 since FY2020.
78	Jahn Corp Top agencies Navy (Department of the Navy)	$7,373,756	0.1%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 34 since FY2020.
79	Alisud - Gesac Handling - Servisair 2 - Scarl Through Algese S.R.L. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$7,254,800	0.1%	Rank history: #50 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 72 since FY2020.
80	Cherokee Nation Through Cherokee Nation Management & Consulting, L.l.c.. Top agencies DOS (Department of State)	$7,044,534	0.1%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
81	Bowhead Marine Support Services, LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$6,981,700	0.1%	Rank history: not on the FY2022–FY2023 lists, #87 in FY2024 and not on the FY2025 list; up 194 since FY2020.
82	Cargo Transport Systems Company Top agencies Army (Department of the Army)	$6,966,587	0.1%	Rank history: not on the FY2022 list, #97 in FY2023 and not on the FY2024–FY2025 lists; down 22 since FY2020.
83	Maccs-Easi JV 1 LLC Top agencies USAF (Department of the Air Force)	$6,952,210	0.1%	Rank history: #76 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
84	Draken International, LLC Top agencies Navy (Department of the Navy)	$6,784,425	0.1%	Rank history: #72 in FY2022, #78 in FY2023, #95 in FY2024 and #90 in FY2025; up 23 since FY2020.
85	Optimum Vehicle Logistics LLC Top agencies Army (Department of the Army)	$6,645,527	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Windy Bay Services LLC Top agencies Navy (Department of the Navy)	$6,436,046	0.1%	Rank history: #52 in FY2022 and not on the FY2023–FY2025 lists; up 72 since FY2020.
87	Battlespace, Inc. Top agencies USAF (Department of the Air Force)	$6,426,087	0.1%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
88	C2G, Ltd Co. Top agencies USAF (Department of the Air Force)	$6,332,878	0.1%	Rank history: #97 in FY2022, #81 in FY2023, not on the FY2024 list and #86 in FY2025; up 27 since FY2020.
89	Empire Aircraft Services Inc. Top agencies USAF (Department of the Air Force)	$6,199,751	0.1%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
90	Aero TECH Service Associates, Inc. Top agencies USAF (Department of the Air Force)	$6,129,339	0.1%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
91	Marine Terminals Corporation 2 awardees, including Ports America Inc. Top agencies Army (Department of the Army)	$6,048,998	0.1%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
92	Skyquest Aviation LLC Top agencies DOJ (Department of Justice) Navy (Department of the Navy) USAF (Department of the Air Force)	$5,989,853	0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
93	Liberty Global Logistics LLC Top agencies Army (Department of the Army)	$5,857,293	0.1%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; up 335 since FY2020.
94	Unmanned Systems Incorporated Top agencies USAF (Department of the Air Force)	$5,652,182	0.1%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
95	Boeing Aerospace Operations, Inc. Top agencies USAF (Department of the Air Force)	$5,642,052	0.1%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
96	Professional Contract Services, Inc. Top agencies USAF (Department of the Air Force)	$5,602,673	0.1%	Rank history: #71 in FY2022, #76 in FY2023, #90 in FY2024 and #75 in FY2025; down 14 since FY2020.
97	J.b. Hunt Transport Services, Inc. Through J.b. Hunt Transport Inc. Top agencies DHS (Department of Homeland Security)	$5,346,567	0.1%	Rank history: not on the FY2022–FY2025 lists; up 80 since FY2020.
98	Pacific Layberthing South, LLC Top agencies DOT (Department of Transportation)	$5,219,079	0.1%	Rank history: #47 in FY2022, #64 in FY2023, #83 in FY2024 and #58 in FY2025; up 165 since FY2020.
99	Pole Star Space Applications Limited 2 awardees, including Pole Star Space Applications USA Inc. Top agencies DHS (Department of Homeland Security)	$5,128,981	0.1%	Rank history: #85 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 26 since FY2020.
100	Hawaiian Holdings Inc Through Hawaiian Airlines, Inc. Top agencies Army (Department of the Army)	$5,008,043	0.1%	Rank history: not on the FY2022–FY2025 lists; up 150 since FY2020.

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100 of 1,582 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 488

Code	Net obligations	Largest contractor
4881 Support Activities for Air Transportation	$7,361,453,701	Amentum Services, Inc.
4883 Support Activities for Water Transportation	$506,192,264	Global Pcci (Gpc)
4885 Freight Transportation Arrangement	$242,642,948	Crowley Government Services Inc.
4889 Other Support Activities for Transportation	$209,660,233	International Auto Logistics, LLC
4884 Support Activities for Road Transportation	$22,539,106	Professional Contract Services, Inc.
4882 Support Activities for Rail Transportation	$8,379,642	Bering Straits Native 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 $9.01 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.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 488 contractors in FY2021?

1. Amentum Services, Inc. ($826M), 2. M1 Support Services, L.P. ($784M), 3. Vertex Aerospace LLC ($748M), 4. RTX Corporation ($564M), 5. Remington Arms Company LLC ($461M), 6. Leidos Holdings, Inc. ($412M), 7. Northrop Grumman Corporation ($349M), 8. Aarcorp ($298M), 9. The Boeing Company ($275M), 10. IAP Global Services LLC ($238M).

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