Top 100 Government Accountability Office Contractors, FY2021

Name: Top 100 Government Accountability Office Contractors, FY2021
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

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

The top 10 won 72% of FY2021 Government Accountability Office contract dollars

Contract obligations: $110,041,059 Net of deobligations, by the Government Accountability Office and its offices
Contractors: 148 Parent companies with an obligation
Largest contractor: EMCOR Group, Inc. $28.4 million, 25.0% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	EMCOR Group, Inc. Through Emcor Government Services, Inc. Top NAICS codes 561210 Facilities Support Services	$28,381,473	25.0%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #3 in FY2025; up 1 since FY2020.
2	Advanced Technology Systems Inc. Top NAICS codes 541512 Computer Systems Design Services	$25,590,616	22.6%	Rank history: #7 in FY2022, #1 in FY2023, #1 in FY2024 and not on the FY2025 list; down 1 since FY2020.
3	Securamerica, LLC Through American Security Programs Inc. Top NAICS codes 561612 Security Guards and Patrol Services	$7,200,974	6.4%	Rank history: not on the FY2022 list, #5 in FY2023, #6 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Dell Federal Systems L.P. 2 awardees, including Dell Marketing L.P. Top NAICS codes 334111 Electronic Computer Manufacturing 511210 Software Publishers	$6,200,462	5.5%	Rank history: #42 in FY2022 and not on the FY2023–FY2025 lists; up 32 since FY2020.
5	Insight Public Sector Inc. Top NAICS codes 511210 Software Publishers	$3,170,149	2.8%	Rank history: #5 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
6	Buchanan & Edwards, Inc. Top NAICS codes 541512 Computer Systems Design Services	$3,087,814	2.7%	Rank history: #3 in FY2022, #6 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
7	Sikich CPA LLC Top NAICS codes 541211 Offices of Certified Public Accountants	$2,264,348	2.0%	Rank history: #25 in FY2022, #22 in FY2023, #17 in FY2024 and #18 in FY2025; up 1 since FY2020.
8	Serco North America (Holdings) Inc Through Serco Services Inc. Top NAICS codes 541330 Engineering Services	$2,203,613	1.9%	Rank history: #12 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; up 5 since FY2020.
9	New TECH Solutions, Inc. Top NAICS codes 541519 Other Computer Related Services	$2,183,143	1.9%	Rank history: #8 in FY2022, #11 in FY2023, #13 in FY2024 and #37 in FY2025; up 3 since FY2020.
10	Lumen Technologies, Inc. Through Lumen Technologies Government Solutions, Inc. Top NAICS codes 517110 Wired Telecommunications Carriers	$1,755,834	1.5%	Rank history: #10 in FY2022, #4 in FY2023, #5 in FY2024 and not on the FY2025 list; up 30 since FY2020.
11	Arcadis N.V. Top NAICS codes 541330 Engineering Services	$1,439,755	1.3%	Rank history: #17 in FY2022, #19 in FY2023, #22 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
12	Govsmart, Inc. Top NAICS codes 541519 Other Computer Related Services	$1,218,858	1.1%	Rank history: #15 in FY2022, #16 in FY2023, #10 in FY2024 and #15 in FY2025; new, not ranked in FY2020.
13	Verizon Communications Inc. 3 awardees, including Verizon Federal Inc. and Cellco Partnership Top NAICS codes 517919 All Other Telecommunications 541519 Other Computer Related Services	$1,208,580	1.1%	Rank history: #24 in FY2022, #29 in FY2023, #39 in FY2024 and not on the FY2025 list; down 9 since FY2020.
14	Jacobs Engineering Group Inc. Top NAICS codes 541330 Engineering Services	$1,088,225	1.0%	Rank history: #27 in FY2022, #9 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
15	August Schell Enterprises, Inc. Top NAICS codes 541519 Other Computer Related Services	$987,365	0.9%	Rank history: #14 in FY2022, #20 in FY2023, #26 in FY2024 and #11 in FY2025; new, not ranked in FY2020.
16	Carahsoft Technology Corp Top NAICS codes 511210 Software Publishers 334111 Electronic Computer Manufacturing	$982,632	0.9%	Rank history: #21 in FY2022, #25 in FY2023, #15 in FY2024 and #17 in FY2025; up 43 since FY2020.
17	Thomson Reuters (Tax & Accounting) Inc. 2 awardees, including West Publishing Corporation Top NAICS codes 519190 All Other Information Services	$977,250	0.9%	Rank history: #18 in FY2022, #24 in FY2023, #44 in FY2024 and #51 in FY2025; up 30 since FY2020.
18	Pistis LLC Top NAICS codes 541512 Computer Systems Design Services	$976,800	0.9%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
19	Four LLC Top NAICS codes 541519 Other Computer Related Services	$797,501	0.7%	Rank history: #34 in FY2022, #13 in FY2023, #12 in FY2024 and #16 in FY2025; down 3 since FY2020.
20	Chickasaw Health Consulting, LLC Top NAICS codes 541612 Human Resources Consulting Services	$755,566	0.7%	Rank history: #26 in FY2022, #31 in FY2023, not on the FY2024 list and #56 in FY2025; down 3 since FY2020.
21	Versar Inc. 2 awardees, including Versar Security Systems, LLC Top NAICS codes 561621 Security Systems Services (except Locksmiths)	$704,837	0.6%	Rank history: #13 in FY2022, #14 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
22	The Building People LLC Top NAICS codes 541614 Process, Physical Distribution, and Logistics Consulting Services 561210 Facilities Support Services	$635,031	0.6%	Rank history: #23 in FY2022, #15 in FY2023, #20 in FY2024 and #28 in FY2025; new, not ranked in FY2020.
23	Software Information Resource Corp. Top NAICS codes 541511 Custom Computer Programming Services 511210 Software Publishers	$612,138	0.5%	Rank history: not on the FY2022 list, #21 in FY2023, #77 in FY2024 and #44 in FY2025; new, not ranked in FY2020.
24	Proquest LLC Top NAICS codes 519190 All Other Information Services	$568,311	0.5%	Rank history: not on the FY2022 list, #34 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
25	CDW Corporation Through CDW Government LLC Top NAICS codes 541519 Other Computer Related Services	$539,360	0.5%	Rank history: #58 in FY2022, #32 in FY2023, #93 in FY2024 and not on the FY2025 list; up 6 since FY2020.
26	Ebsco Industries Inc. 2 awardees Top NAICS codes 519190 All Other Information Services	$531,164	0.5%	Rank history: #29 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
27	Mercom, Incorporated Top NAICS codes 334310 Audio and Video Equipment Manufacturing 541519 Other Computer Related Services	$524,037	0.5%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
28	On Assignment, Inc. Through ECS Federal, LLC Top NAICS codes 541512 Computer Systems Design Services 541519 Other Computer Related Services	$497,465	0.4%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
29	Iron Bow Technologies, LLC Top NAICS codes 541519 Other Computer Related Services	$496,597	0.4%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.
30	Stuart B. Consultants, Inc. Top NAICS codes 541930 Translation and Interpretation Services	$496,361	0.4%	Rank history: #31 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; up 15 since FY2020.
31	Executive Information Systems, L.L.C. Top NAICS codes 541519 Other Computer Related Services	$490,000	0.4%	Rank history: #35 in FY2022, #38 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
32	Four Points Technology, L.L.C. Top NAICS codes 541519 Other Computer Related Services 423430 Computer and Computer Peripheral Equipment and Software Merchant Wholesalers	$477,502	0.4%	Rank history: #6 in FY2022, #3 in FY2023, #3 in FY2024 and #1 in FY2025; up 90 since FY2020.
33	Gartner, Inc. Top NAICS codes 519120 Libraries and Archives 519190 All Other Information Services	$473,304	0.4%	Rank history: #33 in FY2022, #46 in FY2023, #34 in FY2024 and #46 in FY2025; down 6 since FY2020.
34	Tyler Federal, LLC Top NAICS codes 511210 Software Publishers 541512 Computer Systems Design Services	$451,133	0.4%	Rank history: #93 in FY2022, not on the FY2023 list, #67 in FY2024 and not on the FY2025 list; up 39 since FY2020.
35	Trigent Solutions Inc. Top NAICS codes 541430 Graphic Design Services	$437,884	0.4%	Rank history: #56 in FY2022, #61 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
36	Ricoh Company,Ltd. Through Ricoh USA Inc. Top NAICS codes 333315 Photographic and Photocopying Equipment Manufacturing	$432,802	0.4%	Rank history: #32 in FY2022, #85 in FY2023, #74 in FY2024 and #69 in FY2025; down 1 since FY2020.
37	EBL Engineers, LLC Top NAICS codes 541330 Engineering Services	$418,785	0.4%	Rank history: not on the FY2022–FY2023 lists, #49 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
38	Fiscalnote, Inc. Through Cq-Roll Call, Inc. Top NAICS codes 519190 All Other Information Services	$405,956	0.4%	Rank history: #41 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
39	Leadership Connect, Inc. Top NAICS codes 511140 Directory and Mailing List Publishers 519190 All Other Information Services	$391,450	0.3%	Rank history: #38 in FY2022, #41 in FY2023, #43 in FY2024 and #36 in FY2025; down 10 since FY2020.
40	Epoch Concepts LLC Top NAICS codes 541519 Other Computer Related Services	$374,418	0.3%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
41	Nana Regional Corporation Inc Through Affigent, LLC Top NAICS codes 541519 Other Computer Related Services	$356,690	0.3%	Rank history: #43 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
42	Optiv Federal Inc. Top NAICS codes 541513 Computer Facilities Management Services	$327,110	0.3%	Rank history: #45 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
43	Mcgraw Hill Financial Inc. Through S&P Global Market Intelligence LLC Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$306,908	0.3%	Rank history: #37 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
44	Mythics, LLC Through Emergent, LLC Top NAICS codes 511210 Software Publishers 541519 Other Computer Related Services	$301,786	0.3%	Rank history: #19 in FY2022, #30 in FY2023, #25 in FY2024 and #29 in FY2025; down 24 since FY2020.
45	Agilquest Corporation Top NAICS codes 541519 Other Computer Related Services	$300,006	0.3%	Rank history: #51 in FY2022, #60 in FY2023, #50 in FY2024 and #48 in FY2025; new, not ranked in FY2020.
46	Skillsoft Corporation Through Skillsoft (Us) LLC Top NAICS codes 511210 Software Publishers	$294,190	0.3%	Rank history: #48 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
47	National Academy of Sciences Top NAICS codes 541690 Other Scientific and Technical Consulting Services	$269,548	0.2%	Rank history: #30 in FY2022, #56 in FY2023, #31 in FY2024 and not on the FY2025 list; down 28 since FY2020.
48	Calloway & Associates, Inc. Top NAICS codes 541519 Other Computer Related Services	$261,247	0.2%	Rank history: #50 in FY2022, #55 in FY2023, #65 in FY2024 and not on the FY2025 list; down 7 since FY2020.
49	Integration Technologies Group, Inc. Top NAICS codes 541519 Other Computer Related Services	$251,555	0.2%	Rank history: not on the FY2022–FY2024 lists and #86 in FY2025; new, not ranked in FY2020.
50	Black Knight Data & Analytics LLC Top NAICS codes 541910 Marketing Research and Public Opinion Polling	$240,000	0.2%	Rank history: #49 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
51	Red River Technology LLC Top NAICS codes 541519 Other Computer Related Services	$223,901	0.2%	Rank history: #36 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
52	RHG Group, Inc. Top NAICS codes 485999 All Other Transit and Ground Passenger Transportation	$221,210	0.2%	Rank history: #54 in FY2022, #63 in FY2023, #54 in FY2024 and #85 in FY2025; down 9 since FY2020.
53	Accelera Solutions Inc. Top NAICS codes 541519 Other Computer Related Services	$203,587	0.2%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
54	Bloomberg LP 2 awardees, including Bloomberg Finance LP and Bloomberg Industry Group, Inc. Top NAICS codes 519190 All Other Information Services	$202,554	0.2%	Rank history: #57 in FY2022, #73 in FY2023, #88 in FY2024 and #70 in FY2025; down 10 since FY2020.
55	Omni Business Systems, Inc. Top NAICS codes 532420 Office Machinery and Equipment Rental and Leasing	$181,923	0.2%	Rank history: #65 in FY2022, #67 in FY2023, #61 in FY2024 and #54 in FY2025; down 13 since FY2020.
56	Sinclair Broadcast Group Inc. Through Politico, LLC Top NAICS codes 519190 All Other Information Services	$170,000	0.2%	Rank history: #52 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
57	Open Text Corporation Top NAICS codes 541512 Computer Systems Design Services	$167,467	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	JDG Associates Ltd Top NAICS codes 541612 Human Resources Consulting Services	$165,000	0.1%	Rank history: #55 in FY2022, #74 in FY2023, #53 in FY2024 and not on the FY2025 list; down 10 since FY2020.
59	Ergogenesis LLC Through Ergogenesis Workplace Solutions LLC Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing	$164,748	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Cliftonlarsonallen LLP Top NAICS codes 541219 Other Accounting Services	$158,676	0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
61	Communications Professionals Inc. Top NAICS codes 511210 Software Publishers	$156,928	0.1%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
62	Supplysource DC, LLC Top NAICS codes 337214 Office Furniture (except Wood) Manufacturing	$144,906	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Vantage Human Resource Services, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$144,886	0.1%	Rank history: #88 in FY2022, #72 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
64	The Gallup Organization Through Gallup, Inc. Top NAICS codes 541910 Marketing Research and Public Opinion Polling	$139,849	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	M Arthur Gensler JR & Associates Inc. Top NAICS codes 541310 Architectural Services	$136,140	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Signet Technologies Inc. Top NAICS codes 334512 Automatic Environmental Control Manufacturing for Residential, Commercial, and Appliance Use	$133,610	0.1%	Rank history: not on the FY2022–FY2025 lists; down 42 since FY2020.
67	Tvar Solutions, LLC Top NAICS codes 541519 Other Computer Related Services	$131,685	0.1%	Rank history: #63 in FY2022, #70 in FY2023, #68 in FY2024 and not on the FY2025 list; down 21 since FY2020.
68	Reed Elsevier Inc. 3 awardees, including Relx Inc., Lnrs Data Services Inc. and Elsevier B.V. Top NAICS codes 519190 All Other Information Services 488190 Other Support Activities for Air Transportation	$128,296	0.1%	Rank history: #70 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; up 21 since FY2020.
69	Eurekafacts LLC Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$111,339	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
70	Sunplus Data Group, Inc. Top NAICS codes 561320 Temporary Help Services	$105,872	0.1%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
71	Astrophysics Inc. Top NAICS codes 334519 Other Measuring and Controlling Device Manufacturing	$92,400	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Management Concepts, Inc. Top NAICS codes 611430 Professional and Management Development Training	$86,210	0.1%	Rank history: not on the FY2022–FY2025 lists; down 6 since FY2020.
73	Info-Tech Research Group Inc. Top NAICS codes 541519 Other Computer Related Services	$86,112	0.1%	Rank history: #74 in FY2022, #79 in FY2023, #79 in FY2024 and not on the FY2025 list; down 8 since FY2020.
74	Inside Washington Publishers LLC Top NAICS codes 519190 All Other Information Services	$83,500	0.1%	Rank history: #75 in FY2022, #80 in FY2023, #76 in FY2024 and #61 in FY2025; down 7 since FY2020.
75	Fedex Corp Through Federal Express Corp Top NAICS codes 492110 Couriers and Express Delivery Services	$80,000	0.1%	Rank history: #64 in FY2022, #53 in FY2023, #56 in FY2024 and #66 in FY2025; down 7 since FY2020.
76	DUN & Bradstreet Inc. Top NAICS codes 519190 All Other Information Services 561450 Credit Bureaus	$76,100	0.1%	Rank history: not on the FY2022 list, #89 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
77	Metgreen Solutions Inc. Top NAICS codes 541519 Other Computer Related Services	$72,710	0.1%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
78	Self Governance Communication & Education Tribal Consortium Inc. Top NAICS codes 813920 Professional Organizations	$70,935	0.1%	Rank history: #85 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
79	ACG Systems, Inc. Top NAICS codes 334290 Other Communications Equipment Manufacturing	$69,870	0.1%	Rank history: #80 in FY2022, #87 in FY2023, not on the FY2024 list and #58 in FY2025; down 23 since FY2020.
80	Tax Analysts Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$68,380	0.1%	Rank history: #79 in FY2022, #86 in FY2023, #81 in FY2024 and #65 in FY2025; down 5 since FY2020.
81	Environment & Energy Publishing, LLC Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$64,965	0.1%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
82	DH Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$60,709	0.1%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
83	Whitaker Brothers Business Machines, Inc. Top NAICS codes 339944 Carbon Paper and Inked Ribbon Manufacturing	$58,730	0.1%	Rank history: not on the FY2022–FY2025 lists; up 46 since FY2020.
84	Ma Federal, Inc. Through Igov Technologies, Inc. Top NAICS codes 541519 Other Computer Related Services	$58,112	0.1%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; down 2 since FY2020.
85	Healthequity, Inc. Top NAICS codes 524292 Pharmacy Benefit Management and Other Third Party Administration of Insurance and Pension Funds	$52,883	<0.1%	Rank history: #84 in FY2022, #97 in FY2023, #91 in FY2024 and #94 in FY2025; new, not ranked in FY2020.
86	National Institute of Transition Planning, Inc. Top NAICS codes 541612 Human Resources Consulting Services	$47,400	<0.1%	Rank history: #92 in FY2022, #94 in FY2023, not on the FY2024 list and #84 in FY2025; new, not ranked in FY2020.
87	Wolters Kluwer N.V. Through CCH Incorporated Top NAICS codes 519130 Internet Publishing and Broadcasting and Web Search Portals	$47,320	<0.1%	Rank history: #91 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
88	Serco Services Inc. Top NAICS codes 541330 Engineering Services	$46,945	<0.1%	Rank history: #9 in FY2022 and not on the FY2023–FY2025 lists; down 77 since FY2020.
89	Government Acquisitions LLC Top NAICS codes 541519 Other Computer Related Services	$44,927	<0.1%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	PCS Enterprises, Inc. Top NAICS codes 541611 Administrative Management and General Management Consulting Services	$42,973	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
91	International Business Machines Corporation Top NAICS codes 518210 Computing Infrastructure Providers, Data Processing, Web Hosting, and Related Services	$40,068	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
92	Paul Hastings LLP Top NAICS codes 541110 Offices of Lawyers	$40,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Fcn, Inc. Top NAICS codes 541512 Computer Systems Design Services	$39,781	<0.1%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
94	Unison Virtual Acquisition Office LLC Top NAICS codes 519190 All Other Information Services	$39,500	<0.1%	Rank history: #97 in FY2022, #98 in FY2023, #85 in FY2024 and #72 in FY2025; down 2 since FY2020.
95	Caseware USA Inc. Top NAICS codes 541511 Custom Computer Programming Services	$39,069	<0.1%	Rank history: #95 in FY2022, #95 in FY2023, #92 in FY2024 and not on the FY2025 list; up 1 since FY2020.
96	Immixtechnology Inc. Top NAICS codes 541519 Other Computer Related Services	$38,245	<0.1%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
97	Williams, Adley & Company DC LLP Top NAICS codes 541211 Offices of Certified Public Accountants	$38,232	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Goodwill Easter Seals Miami Valley Top NAICS codes 561720 Janitorial Services	$36,101	<0.1%	Rank history: #98 in FY2022, #100 in FY2023, #96 in FY2024 and not on the FY2025 list; up 6 since FY2020.
99	William S. Hein & Co., Inc. Top NAICS codes 519190 All Other Information Services	$35,460	<0.1%	Rank history: #99 in FY2022, not on the FY2023 list, #98 in FY2024 and #82 in FY2025; down 1 since FY2020.
100	LKH Architecture, LLC Top NAICS codes 541310 Architectural Services	$34,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 36 since FY2020.

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100 of 148 contractors listed here. See the rest on GovTribe.

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 $113 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

Who were the top 10 Government Accountability Office contractors in FY2021?

1. EMCOR Group, Inc. ($28.4M), 2. Advanced Technology Systems Inc. ($25.6M), 3. Securamerica, LLC ($7.2M), 4. Dell Federal Systems L.P. ($6.2M), 5. Insight Public Sector Inc. ($3.17M), 6. Buchanan & Edwards, Inc. ($3.09M), 7. Sikich CPA LLC ($2.26M), 8. Serco North America (Holdings) Inc ($2.2M), 9. New TECH Solutions, Inc. ($2.18M), 10. Lumen Technologies, Inc. ($1.76M).

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