Top 100 Contractors in PSC Z1AA: Maintenance of Office Buildings, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	JE Dunn Construction Group Inc. Through J.e. Dunn Construction Company Top agencies GSA (General Services Administration)	$53,728,352	7.0%	Rank history: #27 in FY2022, #60 in FY2023, #49 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
2	The Tatitlek Corporation 2 awardees, including Tatitlek Technologies, LLC and Port Fidalgo Constructors Inc. Top agencies DOS (Department of State) USAF (Department of the Air Force)	$51,591,716	6.7%	Rank history: #25 in FY2022, #2 in FY2023, #2 in FY2024 and #4 in FY2025; unchanged since FY2020.
3	EMCOR Group, Inc. Through Emcor Government Services, Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) HHS (Department of Health and Human Services)	$34,561,928	4.5%	Rank history: #2 in FY2022, #4 in FY2023, #6 in FY2024 and #6 in FY2025; up 13 since FY2020.
4	Puyenpa Services, LLC Top agencies WHS (DOD Washington Headquarters Service) GSA (General Services Administration)	$24,508,138	3.2%	Rank history: not on the FY2022 list, #61 in FY2023 and not on the FY2024–FY2025 lists; up 82 since FY2020.
5	Tlingit Haida Tribal Business Corporation 2 awardees, including T&H Services, LLC and Kira LLC Top agencies DOS (Department of State) GSA (General Services Administration)	$17,713,080	2.3%	Rank history: #12 in FY2022, #15 in FY2023, #60 in FY2024 and not on the FY2025 list; unchanged since FY2020.
6	Union Station Venture, Ltd. Through Jones Lang Lasalle Americas, Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$16,699,982	2.2%	Rank history: #3 in FY2022, #1 in FY2023 and not on the FY2024–FY2025 lists; up 71 since FY2020.
7	PAE Government Services Inc. 2 awardees, including Amentum Design and Facility Management Top agencies DOS (Department of State) Navy (Department of the Navy)	$15,191,810	2.0%	Rank history: #28 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
8	Nana Regional Corporation Inc 2 awardees, including Jade Creek Construction LLC and Sava Workforce Solutions LLC Top agencies Navy (Department of the Navy) DOJ (Department of Justice)	$14,554,656	1.9%	Rank history: #21 in FY2022, #34 in FY2023, not on the FY2024 list and #31 in FY2025; up 59 since FY2020.
9	Professional Contract Services, Inc. Top agencies Army (Department of the Army)	$14,451,007	1.9%	Rank history: #17 in FY2022, #16 in FY2023, #17 in FY2024 and #16 in FY2025; up 96 since FY2020.
10	King & George, LLC 2 awardees, including Invicta Global, LLC Top agencies GSA (General Services Administration) SSA (Social Security Administration) Treasury (Department of the Treasury)	$13,563,144	1.8%	Rank history: #5 in FY2022, #9 in FY2023, #8 in FY2024 and #23 in FY2025; up 21 since FY2020.
11	State of California Controllers Office Through Lcor Asset Management Limited Partnership Top agencies GSA (General Services Administration)	$13,365,481	1.7%	Rank history: #16 in FY2022, #12 in FY2023 and not on the FY2024–FY2025 lists; up 164 since FY2020.
12	Koniag, Inc. Through Pacarctic, LLC Top agencies DOS (Department of State) GSA (General Services Administration)	$12,594,248	1.6%	Rank history: #15 in FY2022, #31 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
13	Bering Straits Technical Services, LLC Top agencies Army (Department of the Army)	$11,612,803	1.5%	Rank history: #8 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
14	Action Facilities Management Inc. 2 awardees, including Action Integrated Services LLC Top agencies GSA (General Services Administration) OPM (Office of Personnel Management) DOS (Department of State)	$10,801,727	1.4%	Rank history: #4 in FY2022, #5 in FY2023, #5 in FY2024 and #1 in FY2025; up 26 since FY2020.
15	South Dade Air Conditioning & Refrigeration Inc. Top agencies GSA (General Services Administration)	$9,581,284	1.2%	Rank history: #10 in FY2022, #3 in FY2023, #4 in FY2024 and #2 in FY2025; up 54 since FY2020.
16	Mickan Generalbaugesellschaft Amberg MBH & Co. KG Top agencies USAF (Department of the Air Force)	$9,214,863	1.2%	Rank history: #19 in FY2022, #41 in FY2023, #37 in FY2024 and not on the FY2025 list; up 17 since FY2020.
17	The Chenega Corporation 3 awardees, including Chenega Tri-Services, LLC, Chenega Applied Solutions, LLC and Chenega Facilities Management LLC Top agencies DOI (Department of the Interior) GSA (General Services Administration) USAF (Department of the Air Force)	$9,174,943	1.2%	Rank history: #42 in FY2022, #48 in FY2023 and not on the FY2024–FY2025 lists; up 30 since FY2020.
18	Northern Management Services, Inc. Top agencies GSA (General Services Administration) DOI (Department of the Interior) DOJ (Department of Justice)	$8,714,948	1.1%	Rank history: #18 in FY2022, #8 in FY2023, #10 in FY2024 and #12 in FY2025; up 17 since FY2020.
19	Raven Services Corp Top agencies GSA (General Services Administration) VA (Department of Veterans Affairs) AOUSC (Administrative Office of the U.S. Courts)	$8,126,186	1.1%	Rank history: #23 in FY2022, #18 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
20	J & J Maintenance Inc. Top agencies USAF (Department of the Air Force)	$7,719,538	1.0%	Rank history: #34 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
21	Bristol Bay Native Corporation 2 awardees, including CCI Energy and Construction Services, LLC and CCI Construction Services, LLC Top agencies Army (Department of the Army) DOJ (Department of Justice)	$7,328,847	1.0%	Rank history: not on the FY2022–FY2024 lists and #84 in FY2025; down 18 since FY2020.
22	M.c. Dean, Inc. Top agencies GSA (General Services Administration) SSA (Social Security Administration) DOJ (Department of Justice)	$6,988,518	0.9%	Rank history: #9 in FY2022, #25 in FY2023, #22 in FY2024 and #22 in FY2025; up 95 since FY2020.
23	F.k. Horn GMBH & Co. Kg-Bauunternehmung Top agencies USAF (Department of the Air Force)	$6,883,614	0.9%	Rank history: #20 in FY2022, #36 in FY2023, #30 in FY2024 and #32 in FY2025; down 14 since FY2020.
24	Firelake Construction Inc. Top agencies USDA (Department of Agriculture) Army (Department of the Army)	$6,161,671	0.8%	Rank history: #29 in FY2022, #33 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	Snodgrass Contracting LLC 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$6,008,214	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	BB Government Services GMBH Through Porr Government Services GMBH Top agencies USAF (Department of the Air Force)	$5,951,991	0.8%	Rank history: #30 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
27	Ben Fitzgerald Real Estate Services, L.L.C. Top agencies GSA (General Services Administration) SSA (Social Security Administration) AOUSC (Administrative Office of the U.S. Courts)	$5,843,911	0.8%	Rank history: #59 in FY2022, #50 in FY2023, #68 in FY2024 and #46 in FY2025; up 7 since FY2020.
28	Schneider Electric Buildings Americas Inc. Top agencies GSA (General Services Administration)	$5,715,925	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Lifecycle Construction Services, LLC Top agencies Army (Department of the Army)	$5,702,764	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
30	Pace-Amtex JV, LLC Top agencies USAF (Department of the Air Force)	$5,337,006	0.7%	Rank history: #32 in FY2022, not on the FY2023 list, #70 in FY2024 and not on the FY2025 list; up 243 since FY2020.
31	Legend Construction and Painting Inc. Top agencies AOUSC (Administrative Office of the U.S. Courts) FTC (Federal Trade Commission) GSA (General Services Administration)	$5,318,707	0.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Wolff & Muller Government Services GMBH & Co. KG Through Wolff & Müller Government Services GMBH & Co. KG Top agencies USAF (Department of the Air Force)	$4,939,938	0.6%	Rank history: #50 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; down 12 since FY2020.
33	Swan Contracting LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$4,909,598	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Nve, Inc. Top agencies Treasury (Department of the Treasury) FHFA (Federal Housing Finance Agency)	$4,886,504	0.6%	Rank history: #33 in FY2022, #17 in FY2023, #9 in FY2024 and #14 in FY2025; down 9 since FY2020.
35	K'oyitl'ots'ina, Limited 2 awardees, including Brooks Range Contract Services, Inc. and Kcorp Support Services, Inc. Top agencies GSA (General Services Administration) Treasury (Department of the Treasury) DOL (Department of Labor)	$4,563,023	0.6%	Rank history: #36 in FY2022, #19 in FY2023, #32 in FY2024 and #8 in FY2025; down 8 since FY2020.
36	Ready Services, LLC Top agencies Army (Department of the Army)	$4,502,441	0.6%	Rank history: not on the FY2022–FY2025 lists; up 424 since FY2020.
37	CCI General Contractors LLC Top agencies WHS (DOD Washington Headquarters Service)	$4,389,612	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Native Star Group, Inc. Top agencies USAF (Department of the Air Force)	$4,292,820	0.6%	Rank history: not on the FY2022–FY2024 lists and #56 in FY2025; up 201 since FY2020.
39	Carmen Roofing Services, LLC Top agencies USAF (Department of the Air Force)	$4,242,214	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	LB & B Associates Inc. Top agencies GSA (General Services Administration)	$4,044,734	0.5%	Rank history: #13 in FY2022, #14 in FY2023, #13 in FY2024 and #11 in FY2025; down 36 since FY2020.
41	SKE Technical Services GMBH Through SKE Support Services GMBH Top agencies USAF (Department of the Air Force)	$3,949,888	0.5%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
42	Mowa-Barlovento Joint Venture A Top agencies Army (Department of the Army)	$3,894,509	0.5%	Rank history: not on the FY2022–FY2025 lists; down 31 since FY2020.
43	Afognak Native Corporation Through Alutiiq C&W Services, LLC Top agencies Treasury (Department of the Treasury)	$3,890,217	0.5%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
44	Yukon Fire Protection Services, Inc. Top agencies GSA (General Services Administration) SSA (Social Security Administration) AOUSC (Administrative Office of the U.S. Courts)	$3,836,442	0.5%	Rank history: #14 in FY2022, #13 in FY2023, #11 in FY2024 and #76 in FY2025; up 12 since FY2020.
45	G2I LLC Top agencies Army (Department of the Army)	$3,549,120	0.5%	Rank history: not on the FY2022–FY2025 lists; up 276 since FY2020.
46	Magna JV Top agencies USAF (Department of the Air Force)	$3,465,000	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
47	CMC & Maintenance Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$3,442,483	0.4%	Rank history: #46 in FY2022, #47 in FY2023, #27 in FY2024 and #29 in FY2025; up 28 since FY2020.
48	H&S Resources Corporation Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts)	$3,381,852	0.4%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
49	Raven Services JV LLC Top agencies GSA (General Services Administration) DHS (Department of Homeland Security) AOUSC (Administrative Office of the U.S. Courts)	$3,345,302	0.4%	Rank history: #78 in FY2022, not on the FY2023 list, #19 in FY2024 and #25 in FY2025; down 6 since FY2020.
50	West Virginia University Through West Virginia University Research Corporation Top agencies NASA (National Aeronautics and Space Administration)	$3,331,709	0.4%	Rank history: #69 in FY2022, #56 in FY2023, #97 in FY2024 and not on the FY2025 list; down 26 since FY2020.
51	Spectrum-Cbs JV LLC Top agencies Treasury (Department of the Treasury)	$3,136,676	0.4%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
52	TK Elevator Corporation 4 awardees Top agencies GSA (General Services Administration) DOT (Department of Transportation) DHS (Department of Homeland Security)	$3,132,986	0.4%	Rank history: #52 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
53	G.m. Hill Engineering, Inc. Top agencies DOJ (Department of Justice) DHS (Department of Homeland Security)	$3,099,229	0.4%	Rank history: not on the FY2022–FY2023 lists, #93 in FY2024 and not on the FY2025 list; down 9 since FY2020.
54	Chimes District of Columbia Inc. Top agencies GSA (General Services Administration)	$2,909,797	0.4%	Rank history: not on the FY2022–FY2025 lists; down 28 since FY2020.
55	Fedcap Rehabilitation Services, Inc. Top agencies GSA (General Services Administration) DOJ (Department of Justice) AOUSC (Administrative Office of the U.S. Courts)	$2,893,681	0.4%	Rank history: #49 in FY2022, #10 in FY2023, #14 in FY2024 and #10 in FY2025; down 1 since FY2020.
56	Aktio Corporation Top agencies Navy (Department of the Navy)	$2,772,745	0.4%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; up 178 since FY2020.
57	Blue Nose It Solutions, Inc. Top agencies GSA (General Services Administration)	$2,696,127	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	Quality Elevator Co., LLC Top agencies DOS (Department of State) DOJ (Department of Justice)	$2,678,221	0.3%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
59	JBG Smithproperties 2 awardees, including Jbgs / TRS LLC Top agencies GSA (General Services Administration)	$2,655,708	0.3%	Rank history: not on the FY2022–FY2025 lists; down 45 since FY2020.
60	J'S Associates, LLC Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts)	$2,654,892	0.3%	Rank history: #64 in FY2022, not on the FY2023 list, #26 in FY2024 and #28 in FY2025; up 28 since FY2020.
61	Landivar & Associates LLC Top agencies Army (Department of the Army)	$2,633,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Wilson 5 Service Company, Inc. Top agencies GSA (General Services Administration) RRB (Railroad Retirement Board) AOUSC (Administrative Office of the U.S. Courts)	$2,572,109	0.3%	Rank history: #41 in FY2022, #76 in FY2023, #91 in FY2024 and #85 in FY2025; down 16 since FY2020.
63	HGL Construction Inc. Top agencies USAF (Department of the Air Force)	$2,521,000	0.3%	Rank history: not on the FY2022–FY2023 lists, #36 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
64	ABM Industries Inc. 2 awardees, including ABM Facility Support Services, LLC Top agencies GSA (General Services Administration) Commerce (Department of Commerce) AOUSC (Administrative Office of the U.S. Courts)	$2,491,926	0.3%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; down 27 since FY2020.
65	Brymak & Associates, Inc. Top agencies Navy (Department of the Navy)	$2,438,424	0.3%	Rank history: #55 in FY2022, #64 in FY2023, not on the FY2024 list and #52 in FY2025; new, not ranked in FY2020.
66	The Whiting-Turner Contracting Company Top agencies Army (Department of the Army)	$2,358,179	0.3%	Rank history: not on the FY2022–FY2025 lists; down 17 since FY2020.
67	Sumitomo Heavy Industries, Ltd. Through Sumiju Yokosuka Kogyo Co., Ltd. Top agencies USAF (Department of the Air Force)	$2,286,135	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Allegiant Facility Services Joint Venture LLC Top agencies GSA (General Services Administration)	$2,218,919	0.3%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
69	Chugach Alaska Corporation 3 awardees, including Wolf Creek Federal Services LLC and Defense Base Services, LLC Top agencies NASA (National Aeronautics and Space Administration) Navy (Department of the Navy)	$2,209,551	0.3%	Rank history: #83 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
70	Professionals HIR LLC Top agencies DOI (Department of the Interior) GSA (General Services Administration) Commerce (Department of Commerce)	$2,203,263	0.3%	Rank history: not on the FY2022–FY2025 lists; up 76 since FY2020.
71	Frank O'connor Inc. Top agencies DLA (Defense Logistics Agency)	$2,150,571	0.3%	Rank history: not on the FY2022–FY2024 lists and #94 in FY2025; up 13 since FY2020.
72	Pundir Group, Inc. Top agencies GSA (General Services Administration)	$2,132,825	0.3%	Rank history: #35 in FY2022, #23 in FY2023, #12 in FY2024 and #9 in FY2025; new, not ranked in FY2020.
73	Natives of Kodiak, Incorporated Through Koman Construction, LLC Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy) USAF (Department of the Air Force)	$2,078,174	0.3%	Rank history: not on the FY2022 list, #68 in FY2023 and not on the FY2024–FY2025 lists; down 56 since FY2020.
74	Seohai Construction Co.,Ltd. Top agencies Army (Department of the Army)	$1,923,060	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Aaecon General Contracting LLC Top agencies USAF (Department of the Air Force)	$1,916,797	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	The Building People LLC Top agencies DHS (Department of Homeland Security) DOL (Department of Labor)	$1,902,338	0.2%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; up 28 since FY2020.
77	Native Energy & Technology Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$1,869,411	0.2%	Rank history: not on the FY2022 list, #89 in FY2023, #84 in FY2024 and not on the FY2025 list; up 2 since FY2020.
78	Signature Renovations LLC Top agencies WHS (DOD Washington Headquarters Service) GSA (General Services Administration) Navy (Department of the Navy)	$1,867,529	0.2%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
79	Trademasters Service, Inc. Top agencies GSA (General Services Administration)	$1,866,525	0.2%	Rank history: #39 in FY2022, #40 in FY2023, #33 in FY2024 and #43 in FY2025; down 43 since FY2020.
80	K2 Contracting Group, LLC Top agencies Army (Department of the Army)	$1,854,140	0.2%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
81	Shin-Ei Real Estate Business Co. Ltd Top agencies DOS (Department of State)	$1,832,366	0.2%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
82	B&M Construction, Inc. Top agencies VA (Department of Veterans Affairs)	$1,821,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Preventive Maintenance Services Company Top agencies GSA (General Services Administration)	$1,817,962	0.2%	Rank history: #53 in FY2022, #43 in FY2023, #100 in FY2024 and not on the FY2025 list; up 32 since FY2020.
84	Kelly Construction Services Inc. Top agencies DOT (Department of Transportation)	$1,799,410	0.2%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 80 since FY2020.
85	EG Designbuild, L.L.C. Top agencies DOS (Department of State)	$1,731,515	0.2%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
86	Urban Services Group Inc. Top agencies GSA (General Services Administration) HHS (Department of Health and Human Services) OPM (Office of Personnel Management)	$1,730,794	0.2%	Rank history: not on the FY2022–FY2025 lists; up 97 since FY2020.
87	Argus CJW JV 3 LLC Top agencies Navy (Department of the Navy)	$1,693,156	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Public Works Contractor Inc. Top agencies Navy (Department of the Navy)	$1,655,555	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Tsay Professional Services, Inc. Top agencies DOE (Department of Energy)	$1,625,395	0.2%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
90	BKC Industries Inc. Top agencies Army (Department of the Army)	$1,623,858	0.2%	Rank history: not on the FY2022–FY2025 lists; up 256 since FY2020.
91	LLB Enterprises LLC Top agencies GSA (General Services Administration)	$1,579,991	0.2%	Rank history: not on the FY2022–FY2025 lists; up 7 since FY2020.
92	Fora Pathways, Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DOJ (Department of Justice)	$1,577,317	0.2%	Rank history: not on the FY2022 list, #70 in FY2023 and not on the FY2024–FY2025 lists; up 19 since FY2020.
93	Marcia K Beckwith Inc. Top agencies USAF (Department of the Air Force)	$1,497,871	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Tower Facility Management, LLC Top agencies NRC (Nuclear Regulatory Commission)	$1,481,766	0.2%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
95	Amerivet Enterprises, LLC Top agencies Army (Department of the Army)	$1,405,014	0.2%	Rank history: not on the FY2022–FY2025 lists; up 33 since FY2020.
96	Southwest Business Improvement District Top agencies GSA (General Services Administration)	$1,393,679	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
97	Windjammer Environmental LLC Top agencies DOS (Department of State)	$1,375,815	0.2%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
98	Oso, Inc. Top agencies GSA (General Services Administration)	$1,366,906	0.2%	Rank history: not on the FY2022–FY2025 lists; up 161 since FY2020.
99	EXP U.S. Services Inc. Through EXP Federal Inc. Top agencies GSA (General Services Administration)	$1,316,626	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	Siemens Aktiengesellschaft Through Siemens Industry Inc. Top agencies GSA (General Services Administration) Smithsonian (Smithsonian Institution)	$1,314,191	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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 $769 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 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