Top 100 Contractors in PSC K0: Modification of Equipment, FY2021

Name: Top 100 Contractors in PSC K0: Modification of Equipment, FY2021
Creator: GovTribe

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

The top 10 won 76% of FY2021 PSC K0 contract dollars

Contract obligations: $2,791,748,193 Net of deobligations, by contracts coded PSC K0 or a code under it
Contractors: 493 Parent companies with an obligation
Largest contractor: Lockheed Martin Corporation $643 million, 21.3% 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	Lockheed Martin Corporation 15 awardees, including Lockheed Martin Global, Inc. and Sikorsky Aircraft Corporation Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency) Army (Department of the Army)	$642,594,924	21.3%	Rank history: #1 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
2	General Dynamics Corporation 7 awardees, including General Dynamics Land Systems Inc., General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) GSA (General Services Administration)	$524,437,953	17.4%	Rank history: #2 in FY2022, #5 in FY2023, #2 in FY2024 and #2 in FY2025; unchanged since FY2020.
3	RTX Corporation 17 awardees, including Raytheon Company and Rockwell Collins, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army) DOT (Department of Transportation)	$327,574,304	10.9%	Rank history: #3 in FY2022, #3 in FY2023, #6 in FY2024 and #5 in FY2025; up 2 since FY2020.
4	The Boeing Company 5 awardees Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$306,740,168	10.2%	Rank history: #5 in FY2022, #2 in FY2023, #3 in FY2024 and #3 in FY2025; down 1 since FY2020.
5	Northrop Grumman Corporation 10 awardees, including Northrop Grumman Systems Corporation Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$213,613,562	7.1%	Rank history: #6 in FY2022, #6 in FY2023, #4 in FY2024 and #4 in FY2025; down 1 since FY2020.
6	BAE Systems PLC 6 awardees, including BAE Systems Technology Solutions & Services Inc., BAE Systems Land & Armaments L.P. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$67,825,711	2.3%	Rank history: #7 in FY2022, #7 in FY2023, #7 in FY2024 and #7 in FY2025; up 3 since FY2020.
7	Leidos Holdings, Inc. 8 awardees, including Leidos, Inc., Dynetics Technical Solutions Inc. and Dynetics, Inc. Top agencies DOT (Department of Transportation) DHS (Department of Homeland Security) Navy (Department of the Navy)	$66,475,675	2.2%	Rank history: #4 in FY2022, #4 in FY2023, #5 in FY2024 and #6 in FY2025; up 9 since FY2020.
8	Huntington Ingalls Industries, Inc. 2 awardees, including Huntington Ingalls Incorporated Top agencies Navy (Department of the Navy)	$58,354,877	1.9%	Rank history: #23 in FY2022, #13 in FY2023, #10 in FY2024 and #14 in FY2025; down 1 since FY2020.
9	DCS Corporation Top agencies Navy (Department of the Navy)	$46,804,792	1.6%	Rank history: #10 in FY2022, #9 in FY2023, #32 in FY2024 and not on the FY2025 list; up 1 since FY2020.
10	L3Harris Technologies, Inc. 10 awardees, including L3Harris Maritime Services Inc., L3Harris Technologies Integrated Systems L.P. and L3 Technologies, Inc. Top agencies Navy (Department of the Navy) DCMA (Defense Contract Management Agency) DHS (Department of Homeland Security)	$42,050,485	1.4%	Rank history: #8 in FY2022, #12 in FY2023, #12 in FY2024 and #8 in FY2025; up 2 since FY2020.
11	Goodwill Industries of South Florida Inc. Top agencies Army (Department of the Army)	$40,788,013	1.4%	Rank history: #34 in FY2022, #65 in FY2023, #73 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
12	General Motors Company Through GM Defense LLC Top agencies DOS (Department of State)	$33,803,388	1.1%	Rank history: #48 in FY2022, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
13	BAE Systems Land & Armaments L.P. 3 awardees, including BAE Systems Technology Solutions & Services Inc. and BAE Systems Information and Electronic Systems Integration Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$23,983,381	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
14	CAE Inc. Through CAE Usa, Inc. Top agencies USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$21,563,557	0.7%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
15	Kbr, Inc. 3 awardees, including KBR Wyle Services, LLC Top agencies Navy (Department of the Navy)	$17,641,424	0.6%	Rank history: #17 in FY2022, #19 in FY2023, #26 in FY2024 and not on the FY2025 list; up 6 since FY2020.
16	General Dynamics Mission Systems, Inc. Top agencies Navy (Department of the Navy)	$16,504,769	0.5%	Rank history: #14 in FY2022, #18 in FY2023, #15 in FY2024 and not on the FY2025 list; up 1 since FY2020.
17	CACI International Inc. 4 awardees, including Caci Nss, LLC, Caci, Inc. - Federal and Caci Ascent Vision, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$16,203,354	0.5%	Rank history: #71 in FY2022, not on the FY2023–FY2024 lists and #23 in FY2025; up 5 since FY2020.
18	General Dynamics Information Technology, Inc. Top agencies Navy (Department of the Navy)	$16,187,301	0.5%	Rank history: #9 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
19	Science Applications International Corporation 2 awardees, including Engility Services, LLC Top agencies Navy (Department of the Navy)	$15,144,660	0.5%	Rank history: #18 in FY2022, #15 in FY2023, #18 in FY2024 and #25 in FY2025; up 5 since FY2020.
20	Vertex Aerospace LLC 2 awardees, including V2X Aerospace LLC and Vertex Aircraft Integration and Sustainment LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$14,545,132	0.5%	Rank history: #16 in FY2022, #17 in FY2023, #66 in FY2024 and not on the FY2025 list; up 18 since FY2020.
21	Tetra Tech, Inc. Through Advanced Management Technology, Inc. Top agencies DOT (Department of Transportation)	$13,771,928	0.5%	Rank history: #12 in FY2022, #11 in FY2023, #16 in FY2024 and #17 in FY2025; down 2 since FY2020.
22	Leonardo S.p.A. 3 awardees, including Laurel Technologies Partnership and DRS Advanced ISR LLC Top agencies Navy (Department of the Navy)	$13,648,806	0.5%	Rank history: #15 in FY2022, not on the FY2023–FY2024 lists and #44 in FY2025; up 67 since FY2020.
23	Systems Application & Technologies Inc. Top agencies Navy (Department of the Navy)	$13,013,051	0.4%	Rank history: #20 in FY2022, #23 in FY2023, #20 in FY2024 and #28 in FY2025; up 6 since FY2020.
24	American Electronic Warfare Associates, Incorporated Top agencies Navy (Department of the Navy)	$11,272,301	0.4%	Rank history: #19 in FY2022, #20 in FY2023, #24 in FY2024 and not on the FY2025 list; up 8 since FY2020.
25	Raytheon Company 3 awardees Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$10,223,695	0.3%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
26	New Directions Technologies, Inc. Top agencies Navy (Department of the Navy)	$9,972,685	0.3%	Rank history: #22 in FY2022, #26 in FY2023, #33 in FY2024 and #34 in FY2025; up 5 since FY2020.
27	Saab, Inc. Top agencies Navy (Department of the Navy)	$9,003,184	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Northrop Grumman Systems Corporation 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$8,605,279	0.3%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
29	Oshkosh Corp 2 awardees, including Oshkosh Defense LLC and Pierce Manufacturing Inc. Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$8,462,898	0.3%	Rank history: #61 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
30	Advanced Electronics Company Limited Top agencies USAF (Department of the Air Force)	$7,503,734	0.2%	Rank history: not on the FY2022 list, #62 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
31	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$5,894,202	0.2%	Rank history: #25 in FY2022, #32 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
32	Electronic Warfare Associates, Inc. Through EWA Government Systems, Inc. Top agencies Navy (Department of the Navy)	$5,703,091	0.2%	Rank history: #30 in FY2022, #39 in FY2023, #78 in FY2024 and not on the FY2025 list; up 4 since FY2020.
33	Korean Air Lines Co.,Ltd. Top agencies USAF (Department of the Air Force)	$5,669,285	0.2%	Rank history: #40 in FY2022, #84 in FY2023, #31 in FY2024 and #63 in FY2025; up 10 since FY2020.
34	De La Fuente Construction, Inc. Top agencies Navy (Department of the Navy)	$5,518,779	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
35	Metson Marine Inc. Through Metson Marine Services, Inc. Top agencies Navy (Department of the Navy)	$4,918,812	0.2%	Rank history: #28 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
36	Government of Canada Through Canadian Commercial Corporation Top agencies Navy (Department of the Navy)	$4,858,726	0.2%	Rank history: #54 in FY2022, #91 in FY2023, #96 in FY2024 and not on the FY2025 list; up 21 since FY2020.
37	Amentum Services, Inc. Top agencies Navy (Department of the Navy)	$4,340,814	0.1%	Rank history: #37 in FY2022, #42 in FY2023, #11 in FY2024 and not on the FY2025 list; up 25 since FY2020.
38	The Mil Corporation Top agencies Navy (Department of the Navy)	$4,120,761	0.1%	Rank history: #36 in FY2022, #34 in FY2023, #28 in FY2024 and #18 in FY2025; new, not ranked in FY2020.
39	Rite-Solutions, Inc. Top agencies Navy (Department of the Navy)	$4,112,149	0.1%	Rank history: #46 in FY2022, #40 in FY2023, #39 in FY2024 and not on the FY2025 list; up 14 since FY2020.
40	Science & Technology Corporation Top agencies Army (Department of the Army)	$4,051,874	0.1%	Rank history: #33 in FY2022, #47 in FY2023, #49 in FY2024 and #52 in FY2025; unchanged since FY2020.
41	Saab AB Through Saab, Inc. Top agencies Navy (Department of the Navy)	$4,026,673	0.1%	Rank history: #21 in FY2022, #22 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
42	A Sonabend Company, Inc. Top agencies Navy (Department of the Navy)	$4,003,925	0.1%	Rank history: #51 in FY2022, #41 in FY2023, #42 in FY2024 and #48 in FY2025; up 5 since FY2020.
43	Avtech Research Corporation Top agencies USAF (Department of the Air Force)	$3,737,379	0.1%	Rank history: #55 in FY2022, #53 in FY2023, #87 in FY2024 and #80 in FY2025; up 192 since FY2020.
44	Battelle Memorial Institute Top agencies DOS (Department of State)	$3,700,474	0.1%	Rank history: not on the FY2022 list, #66 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
45	Precision Resources Inc. Through Precision Fabricating & Cleaning Company, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$3,499,410	0.1%	Rank history: #31 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; up 56 since FY2020.
46	Raven Industries, Inc. Through Aerostar International, LLC Top agencies Navy (Department of the Navy)	$3,080,000	0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
47	Integrated Security Technologies Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DARPA (Defense Advanced Research Projects Agency)	$3,014,881	0.1%	Rank history: #67 in FY2022, #58 in FY2023, #61 in FY2024 and #66 in FY2025; down 10 since FY2020.
48	Sossec, Inc. Top agencies USAF (Department of the Air Force)	$2,999,511	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
49	Arotech Corporation Through Faac Incorporated Top agencies Navy (Department of the Navy)	$2,941,181	0.1%	Rank history: #58 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; up 36 since FY2020.
50	Professional Software Consortium Inc. Top agencies DFAS (Defense Finance and Accounting Service)	$2,907,000	0.1%	Rank history: #49 in FY2022, #50 in FY2023, #60 in FY2024 and not on the FY2025 list; down 11 since FY2020.
51	Pergravis Mission Critical Construction, LLC Top agencies DISA (Defense Information Systems Agency)	$2,784,247	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
52	Crane Technologies Group, Inc. Top agencies Navy (Department of the Navy)	$2,598,471	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Agile Defense, LLC Top agencies DHS (Department of Homeland Security)	$2,583,092	0.1%	Rank history: #47 in FY2022, not on the FY2023–FY2024 lists and #56 in FY2025; up 20 since FY2020.
54	Applied Management Corp Top agencies Navy (Department of the Navy)	$2,472,236	0.1%	Rank history: #65 in FY2022, #68 in FY2023, #47 in FY2024 and #67 in FY2025; up 10 since FY2020.
55	Jacobs Engineering Group Inc. Through Amentum Technology, Inc. Top agencies Navy (Department of the Navy)	$1,941,115	0.1%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
56	Idemia Identity & Security USA LLC Top agencies DHS (Department of Homeland Security)	$1,912,449	0.1%	Rank history: #62 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; up 10 since FY2020.
57	JP Donovan Construction Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,885,950	0.1%	Rank history: #97 in FY2022, #52 in FY2023 and not on the FY2024–FY2025 lists; up 27 since FY2020.
58	David Clark Company Incorporated Through Air-Lock, Incorporated Top agencies NASA (National Aeronautics and Space Administration)	$1,881,995	0.1%	Rank history: #90 in FY2022, #60 in FY2023, #80 in FY2024 and #68 in FY2025; down 12 since FY2020.
59	Windy Bay Services LLC Top agencies Navy (Department of the Navy)	$1,816,694	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Flir Systems Inc. 3 awardees, including Teledyne Flir Defense, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) DHS (Department of Homeland Security)	$1,787,376	0.1%	Rank history: #57 in FY2022, #55 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
61	Advanced It Concepts, LLC Top agencies Army (Department of the Army)	$1,778,703	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Science and Engineering Services LLC Top agencies Navy (Department of the Navy)	$1,727,441	0.1%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; down 39 since FY2020.
63	J.f. Taylor, Inc. Top agencies Navy (Department of the Navy)	$1,714,721	0.1%	Rank history: #43 in FY2022, #51 in FY2023, #52 in FY2024 and #50 in FY2025; new, not ranked in FY2020.
64	BAE Systems Information and Electronic Systems Integration Inc. Top agencies USAF (Department of the Air Force)	$1,637,861	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Kratos S1, Inc. Top agencies Navy (Department of the Navy)	$1,634,209	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Signet Technologies Inc. Top agencies DHA (Defense Health Agency) USAGM (US Agency for Global Media) VA (Department of Veterans Affairs)	$1,604,865	0.1%	Rank history: not on the FY2022–FY2025 lists; up 179 since FY2020.
67	Corporation Strategic Enterprise Solutions Top agencies USAF (Department of the Air Force)	$1,587,182	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Imeco Inc. Top agencies Navy (Department of the Navy)	$1,474,114	<0.1%	Rank history: #53 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
69	The Bank of New York Mellon Corporation Through Eagle Investment Systems LLC Top agencies PBGC (Pension Benefit Guaranty Corporation)	$1,351,050	<0.1%	Rank history: #66 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
70	CGI Federal Inc. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$1,221,202	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
71	Johnson Controls Security Solutions LLC 6 awardees, including Johnson Controls Fire Protection LP, Johnson Controls Navy Systems, LLC and Johnson Controls, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) VA (Department of Veterans Affairs)	$1,200,863	<0.1%	Rank history: #76 in FY2022, #78 in FY2023 and not on the FY2024–FY2025 lists; up 36 since FY2020.
72	Kongsberg Gruppen ASA Through Kongsberg Discovery US, LLC Top agencies Navy (Department of the Navy)	$1,142,162	<0.1%	Rank history: #92 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
73	Agilent Technologies, Inc. Top agencies DHS (Department of Homeland Security)	$1,125,000	<0.1%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
74	Association of American Railroads Through Transportation Technology Center, Inc. Top agencies DHS (Department of Homeland Security)	$1,027,193	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Trilogy Secured Services, L.l.c Top agencies DTRA (Defense Threat Reduction Agency)	$1,020,928	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Bell Boeing Joint Project Office Top agencies Navy (Department of the Navy)	$972,991	<0.1%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
77	Textron Inc. Through Textron Systems Corporation Top agencies Navy (Department of the Navy)	$968,905	<0.1%	Rank history: #24 in FY2022, #96 in FY2023, not on the FY2024 list and #64 in FY2025; new, not ranked in FY2020.
78	Advanced Construction Services Inc. Top agencies USAF (Department of the Air Force)	$937,998	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Kifco, Inc. Top agencies USDA (Department of Agriculture)	$917,302	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Richland Industries LLC Top agencies VA (Department of Veterans Affairs)	$899,977	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Teledyne Technologies Incorporated 2 awardees, including Teledyne Flir Defense, Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$888,126	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Caterpillar Inc. Top agencies Army (Department of the Army)	$876,327	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 71 since FY2020.
83	Telesecurity Sciences, Inc. Top agencies DHS (Department of Homeland Security)	$840,901	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Bundesministerium FUR Umwelt Naturschutz UND Reaktorsicherheit Through Bundesministerium FÜR Umwelt, Naturschutz UND Reaktorsicherheit Top agencies Army (Department of the Army)	$830,766	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Elbit Systems Ltd 2 awardees, including Elbitamerica, Inc. Top agencies Navy (Department of the Navy)	$795,245	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
86	Chugach Technical Solutions LLC Top agencies Navy (Department of the Navy)	$790,000	<0.1%	Rank history: #26 in FY2022, #16 in FY2023, #17 in FY2024 and #24 in FY2025; new, not ranked in FY2020.
87	Parker-Hannifin Corporation Top agencies USAF (Department of the Air Force)	$788,682	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	General and Mechanical Services, LLC Top agencies DOL (Department of Labor)	$755,940	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Data Link Solutions LLC Top agencies USAF (Department of the Air Force)	$752,751	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Huntington Ingalls Incorporated Top agencies Navy (Department of the Navy)	$745,840	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 65 since FY2020.
91	TIM Price Inc. Top agencies Army (Department of the Army)	$700,112	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 64 since FY2020.
92	Delaware Elevator, Inc. Top agencies DOS (Department of State)	$683,918	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Minburn Technology Group, LLC Top agencies VA (Department of Veterans Affairs)	$678,947	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Agma Security Service Inc. Top agencies DHS (Department of Homeland Security)	$677,200	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Trade Products Corp. Top agencies USAF (Department of the Air Force)	$675,161	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
96	Siemens Aktiengesellschaft 3 awardees, including Siemens Government Technologies Inc., Siemens Industry Inc. and Siemens Canada Limited Top agencies DOE (Department of Energy) DOS (Department of State) EPA (Environmental Protection Agency)	$672,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 67 since FY2020.
97	Serviam Construction LLC Top agencies VA (Department of Veterans Affairs)	$657,883	<0.1%	Rank history: #39 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
98	KBR Wyle Services, LLC Top agencies Navy (Department of the Navy)	$650,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Service Mechanical Inc. Top agencies National Gallery of Art	$638,868	<0.1%	Rank history: not on the FY2022–FY2024 lists and #82 in FY2025; up 12 since FY2020.
100	Rigaku Americas Holding Inc Through Rigaku Analytical Devices, Inc. Top agencies DHS (Department of Homeland Security)	$638,000	<0.1%	Rank history: #93 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.

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100 of 493 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC K0

Code	Net obligations	Largest contractor
K016 Modification of Equipment: Aircraft Components and Accessories	$794,877,717	Lockheed Martin Corporation
K059 Modification of Equipment: Electrical and Electronic Equipment Components	$273,025,284	Northrop Grumman Corporation
K058 Modification of Equipment: Communication, Detection, and Coherent Radiation Equipment	$251,680,962	General Dynamics Corporation
K099 Modification of Equipment: Miscellaneous	$54,887,750	Northrop Grumman Corporation
K023 Modification of Equipment: Ground Effect Vehicles, Motor Vehicles, Trailers, and Cycles	$47,694,423	General Motors Company
K070 Modification of Equipment: Automatic Data Processing Equipment (Including Firmware), Software, Supplies and Support Equipment	$31,684,231	General Dynamics Corporation
K063 Modification of Equipment: Alarm, Signal, and Security Detection Systems	$12,907,344	Integrated Security Technologies Inc.

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 $3.01 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 PSC K0 contractors in FY2021?

1. Lockheed Martin Corporation ($643M), 2. General Dynamics Corporation ($524M), 3. RTX Corporation ($328M), 4. The Boeing Company ($307M), 5. Northrop Grumman Corporation ($214M), 6. BAE Systems PLC ($67.8M), 7. Leidos Holdings, Inc. ($66.5M), 8. Huntington Ingalls Industries, Inc. ($58.4M), 9. DCS Corporation ($46.8M), 10. L3Harris Technologies, Inc. ($42.1M).

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