Top 100 Contractors in NAICS 621999: All Other Miscellaneous Ambulatory Health Care Services, FY2021

Name: Top 100 Contractors in NAICS 621999: All Other Miscellaneous Ambulatory Health Care Services, FY2021
Creator: GovTribe

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

The top 10 won 52% of FY2021 NAICS 621999 contract dollars

Contract obligations: $436,696,676 Net of deobligations, by contracts coded NAICS 621999
Contractors: 207 Parent companies with an obligation
Largest contractor: STG International, Inc. $115 million, 24.3% 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	STG International, Inc. Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$114,516,008	24.3%	Rank history: #4 in FY2022, #1 in FY2023, #1 in FY2024 and #8 in FY2025; unchanged since FY2020.
2	National Marrow Donor Program Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$30,908,998	6.6%	Rank history: #37 in FY2022, #73 in FY2023, #88 in FY2024 and #62 in FY2025; unchanged since FY2020.
3	Marshfield Clinic Health System, Inc. Top agencies HHS (Department of Health and Human Services)	$19,981,956	4.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
4	CHS Middle East LLC Through Acuity-Chs, LLC Top agencies DHS (Department of Homeland Security)	$19,956,103	4.2%	Rank history: #8 in FY2022, #11 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
5	Team Health Inc. Through Spectrum Healthcare Resources, Inc. Top agencies HHS (Department of Health and Human Services)	$14,103,441	3.0%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
6	Cognito Systems LLC Top agencies Army (Department of the Army)	$9,561,060	2.0%	Rank history: #9 in FY2022, #10 in FY2023, #5 in FY2024 and #7 in FY2025; new, not ranked in FY2020.
7	Servefed Inc. Top agencies HHS (Department of Health and Human Services) NASA (National Aeronautics and Space Administration)	$8,786,582	1.9%	Rank history: #6 in FY2022, #6 in FY2023, #3 in FY2024 and #4 in FY2025; up 1 since FY2020.
8	American Medical Response, Inc. 3 awardees, including American Medical Response Mid-Atlantic, Inc. Top agencies DHS (Department of Homeland Security) Army (Department of the Army)	$8,777,311	1.9%	Rank history: #83 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 45 since FY2020.
9	Empowered Management Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$8,741,058	1.9%	Rank history: #11 in FY2022, #20 in FY2023, #18 in FY2024 and not on the FY2025 list; down 3 since FY2020.
10	Indian Health Center of Santa Clara Valley Top agencies HHS (Department of Health and Human Services)	$8,031,640	1.7%	Rank history: #45 in FY2022, #38 in FY2023, #44 in FY2024 and #45 in FY2025; up 18 since FY2020.
11	Destiny Management Services, LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$7,782,766	1.7%	Rank history: #17 in FY2022, #8 in FY2023, #6 in FY2024 and #13 in FY2025; unchanged since FY2020.
12	CS Holding Inc. Through CG Services LLC Top agencies DHA (Defense Health Agency)	$7,670,550	1.6%	Rank history: #23 in FY2022, #13 in FY2023, #9 in FY2024 and not on the FY2025 list; down 2 since FY2020.
13	T3I, Inc. Top agencies USAF (Department of the Air Force)	$7,467,000	1.6%	Rank history: #25 in FY2022, #16 in FY2023, #10 in FY2024 and #15 in FY2025; down 1 since FY2020.
14	Medforce Government Solutions, Inc. Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$7,121,723	1.5%	Rank history: #10 in FY2022, #17 in FY2023, #23 in FY2024 and #29 in FY2025; down 7 since FY2020.
15	Fresno American Indian Health Project Top agencies HHS (Department of Health and Human Services)	$7,112,396	1.5%	Rank history: #52 in FY2022, #40 in FY2023, #52 in FY2024 and #50 in FY2025; up 20 since FY2020.
16	Health Partner's Management Group, Incorporated Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$6,982,084	1.5%	Rank history: #15 in FY2022, #12 in FY2023, #7 in FY2024 and #11 in FY2025; down 1 since FY2020.
17	Avosys Technology, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$6,788,031	1.4%	Rank history: #19 in FY2022, #9 in FY2023, #17 in FY2024 and #20 in FY2025; down 4 since FY2020.
18	Seattle Indian Health Board Top agencies HHS (Department of Health and Human Services)	$5,645,586	1.2%	Rank history: #26 in FY2022, #23 in FY2023, #19 in FY2024 and #21 in FY2025; down 9 since FY2020.
19	Quacito LLC Top agencies Army (Department of the Army)	$5,625,391	1.2%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
20	Distinctive Spectrum Healthcare Solutions JV LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$4,915,991	1.0%	Rank history: #20 in FY2022, #18 in FY2023, #27 in FY2024 and #28 in FY2025; up 12 since FY2020.
21	The Chenega Corporation 3 awardees, including Chenega Healthcare Services LLC and American Hospital Services Group LLC Top agencies DOE (Department of Energy) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$4,876,874	1.0%	Rank history: #44 in FY2022, #26 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
22	Standard Technology, Inc. Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$4,725,616	1.0%	Rank history: #29 in FY2022, #27 in FY2023, #22 in FY2024 and #80 in FY2025; up 9 since FY2020.
23	Defense Health Professionals LLC Top agencies USAF (Department of the Air Force)	$4,641,190	1.0%	Rank history: #24 in FY2022, #25 in FY2023, #25 in FY2024 and #35 in FY2025; up 4 since FY2020.
24	Koniag, Inc. Through Kadiak LLC Top agencies DHS (Department of Homeland Security)	$4,438,891	0.9%	Rank history: #13 in FY2022, #15 in FY2023, #84 in FY2024 and #17 in FY2025; new, not ranked in FY2020.
25	Business Enabled Acquisition and Technology, Inc. Top agencies DHA (Defense Health Agency)	$4,385,422	0.9%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
26	Mindleaf Technologies Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) USSOCOM (United States Special Operations Command)	$4,076,364	0.9%	Rank history: #21 in FY2022, #33 in FY2023, #68 in FY2024 and not on the FY2025 list; down 10 since FY2020.
27	Modern Healthcare Services JV LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force)	$3,957,317	0.8%	Rank history: #34 in FY2022, #30 in FY2023, #34 in FY2024 and #34 in FY2025; up 16 since FY2020.
28	Healthcare Resolution Services, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$3,804,559	0.8%	Rank history: #53 in FY2022, not on the FY2023 list, #80 in FY2024 and not on the FY2025 list; down 10 since FY2020.
29	Front Line Ems LLC Top agencies HHS (Department of Health and Human Services)	$3,660,000	0.8%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
30	The Native American Rehabilitation Association of the Northwest, Incorporated Top agencies HHS (Department of Health and Human Services)	$3,653,799	0.8%	Rank history: #40 in FY2022, #34 in FY2023, #36 in FY2024 and #33 in FY2025; down 26 since FY2020.
31	Arapaho Technical Services LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) Navy (Department of the Navy)	$3,369,625	0.7%	Rank history: #36 in FY2022, #31 in FY2023, #13 in FY2024 and #14 in FY2025; up 2 since FY2020.
32	Naphcare LLC Top agencies DOJ (Department of Justice)	$3,288,780	0.7%	Rank history: not on the FY2022 list, #77 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
33	General Infomatics-A Service Disabled Owned Veteran Business, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency) USSOCOM (United States Special Operations Command)	$3,193,170	0.7%	Rank history: #42 in FY2022, #28 in FY2023, #50 in FY2024 and #37 in FY2025; down 7 since FY2020.
34	Forensic Drug & Alcohol Testing LLC Top agencies DOT (Department of Transportation) NRC (Nuclear Regulatory Commission) DHS (Department of Homeland Security)	$3,078,459	0.7%	Rank history: #28 in FY2022, #24 in FY2023, #15 in FY2024 and #18 in FY2025; down 13 since FY2020.
35	Eagle Health, LLC Top agencies Army (Department of the Army)	$2,939,731	0.6%	Rank history: #33 in FY2022, #64 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
36	Dilligas Corp Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$2,497,290	0.5%	Rank history: #12 in FY2022, #7 in FY2023, #12 in FY2024 and #10 in FY2025; up 4 since FY2020.
37	Caban Resources LLC Top agencies USAF (Department of the Air Force)	$2,374,146	0.5%	Rank history: #35 in FY2022, #19 in FY2023, #20 in FY2024 and #22 in FY2025; up 4 since FY2020.
38	Anthony & Associates, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$2,345,475	0.5%	Rank history: #30 in FY2022, #5 in FY2023, #16 in FY2024 and not on the FY2025 list; down 4 since FY2020.
39	Eagle Global Scientific, LLC Top agencies Army (Department of the Army)	$2,291,391	0.5%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
40	Today's Solutions, LLC Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$2,048,943	0.4%	Rank history: #61 in FY2022, not on the FY2023 list, #95 in FY2024 and #95 in FY2025; down 4 since FY2020.
41	MCI Diagnostic Center LLC Top agencies DOL (Department of Labor)	$2,016,336	0.4%	Rank history: not on the FY2022–FY2025 lists; down 36 since FY2020.
42	Vet Accel Inc. Top agencies VA (Department of Veterans Affairs)	$1,996,390	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Valor Network, Inc. Top agencies Army (Department of the Army) HHS (Department of Health and Human Services)	$1,892,587	0.4%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
44	The Native Project Top agencies HHS (Department of Health and Human Services)	$1,809,726	0.4%	Rank history: #46 in FY2022, #37 in FY2023, #40 in FY2024 and #38 in FY2025; down 24 since FY2020.
45	Erprosource360 LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$1,724,220	0.4%	Rank history: #43 in FY2022, #46 in FY2023, #78 in FY2024 and not on the FY2025 list; up 92 since FY2020.
46	Akahi Ingenesis Partners LLC Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$1,707,822	0.4%	Rank history: #39 in FY2022, #41 in FY2023, #61 in FY2024 and #76 in FY2025; up 1 since FY2020.
47	UnitedHealth Group Incorporated Through Optumserve Health Services, Inc. Top agencies HHS (Department of Health and Human Services)	$1,634,980	0.3%	Rank history: #55 in FY2022, not on the FY2023 list, #83 in FY2024 and not on the FY2025 list; up 4 since FY2020.
48	Great Hill Solutions, LLC Top agencies DHA (Defense Health Agency)	$1,500,000	0.3%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
49	Hsg, LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,491,725	0.3%	Rank history: #56 in FY2022, #47 in FY2023, #77 in FY2024 and not on the FY2025 list; down 5 since FY2020.
50	D7, LLC Top agencies Army (Department of the Army)	$1,435,499	0.3%	Rank history: #47 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; up 14 since FY2020.
51	Millennium Health & Fitness, Inc. Top agencies USAF (Department of the Air Force)	$1,348,855	0.3%	Rank history: not on the FY2022–FY2025 lists; down 34 since FY2020.
52	Shadowbox Consulting Associates LLC Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command) USAF (Department of the Air Force)	$1,260,201	0.3%	Rank history: not on the FY2022 list, #84 in FY2023, not on the FY2024 list and #91 in FY2025; down 13 since FY2020.
53	Pafford Medical Services, Inc. Top agencies Army (Department of the Army)	$1,241,269	0.3%	Rank history: #57 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; up 16 since FY2020.
54	Apogee Solutions, Inc. Top agencies Navy (Department of the Navy)	$1,206,765	0.3%	Rank history: #50 in FY2022, not on the FY2023 list, #56 in FY2024 and #54 in FY2025; down 8 since FY2020.
55	Chickasaw Nation Through CNI Professional Services LLC Top agencies USAF (Department of the Air Force)	$1,191,244	0.3%	Rank history: #60 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
56	Sterling Medical Corporation Through Sterling Medical Associates, Inc. Top agencies USAF (Department of the Air Force)	$1,172,827	0.2%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
57	Reef Systems Corp Top agencies Army (Department of the Army)	$1,090,000	0.2%	Rank history: not on the FY2022–FY2025 lists; down 38 since FY2020.
58	Chickasaw Management Services, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$1,082,822	0.2%	Rank history: #58 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
59	American Indian Association of Tucson, Inc. Top agencies HHS (Department of Health and Human Services)	$1,082,573	0.2%	Rank history: #18 in FY2022, #45 in FY2023, #48 in FY2024 and #43 in FY2025; down 34 since FY2020.
60	Virta Medical PC Top agencies VA (Department of Veterans Affairs)	$1,056,000	0.2%	Rank history: #82 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
61	Johnson Venture Management Solutions, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$1,054,229	0.2%	Rank history: #54 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
62	Stratus Federal Solutions LLC Top agencies DHA (Defense Health Agency) USAF (Department of the Air Force) USSOCOM (United States Special Operations Command)	$1,016,458	0.2%	Rank history: #65 in FY2022, #22 in FY2023, #21 in FY2024 and #24 in FY2025; down 5 since FY2020.
63	Vergence LLC Top agencies Army (Department of the Army)	$959,426	0.2%	Rank history: #78 in FY2022, #65 in FY2023, #63 in FY2024 and #58 in FY2025; down 15 since FY2020.
64	Compass Medical Provider LLC Top agencies Army (Department of the Army)	$957,274	0.2%	Rank history: #62 in FY2022, #69 in FY2023, #90 in FY2024 and not on the FY2025 list; up 27 since FY2020.
65	Precision Monitoring LLC Top agencies VA (Department of Veterans Affairs)	$934,712	0.2%	Rank history: #59 in FY2022, #56 in FY2023, #57 in FY2024 and not on the FY2025 list; up 3 since FY2020.
66	JYG Innovations LLC Top agencies USAF (Department of the Air Force)	$928,915	0.2%	Rank history: #70 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; up 81 since FY2020.
67	Katmai Resource Management, LLC Top agencies Army (Department of the Army)	$910,659	0.2%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
68	Digital Mindtrust, LLC Top agencies DHS (Department of Homeland Security)	$896,633	0.2%	Rank history: not on the FY2022–FY2025 lists; down 26 since FY2020.
69	Capital Med Group LLC Top agencies DOJ (Department of Justice)	$882,473	0.2%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; down 17 since FY2020.
70	Lifehealth, LLC Top agencies Army (Department of the Army)	$836,653	0.2%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
71	2Srg LLC Top agencies DOE (Department of Energy)	$761,563	0.2%	Rank history: #76 in FY2022, #63 in FY2023, #71 in FY2024 and not on the FY2025 list; down 6 since FY2020.
72	KE OLA Mamo Top agencies HHS (Department of Health and Human Services)	$754,385	0.2%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
73	Precise Information Systems & Professional Services Inc. Top agencies Army (Department of the Army)	$680,283	0.1%	Rank history: #98 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
74	Ami Expeditionary Healthcare, LLC Top agencies HHS (Department of Health and Human Services) DOJ (Department of Justice)	$669,241	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Distinctive Home Care, Inc. Top agencies Army (Department of the Army)	$615,511	0.1%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 5 since FY2020.
76	Godwin Corp Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$596,081	0.1%	Rank history: #66 in FY2022, #55 in FY2023, #67 in FY2024 and #64 in FY2025; up 7 since FY2020.
77	Alpha Ten Technologies Inc. Top agencies Army (Department of the Army)	$557,404	0.1%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
78	Appddictionstudio Limited Liability Company Top agencies USAF (Department of the Air Force)	$541,800	0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
79	Osprey Technology Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$502,520	0.1%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
80	Echelon Services, LLC Top agencies Army (Department of the Army)	$453,272	0.1%	Rank history: #84 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
81	Potomac Healthcare Solutions, LLC Top agencies Army (Department of the Army)	$450,475	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Venesco LLC Top agencies Army (Department of the Army)	$423,876	0.1%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and #92 in FY2025; new, not ranked in FY2020.
83	Sacramento Native American Health Center Inc. Top agencies HHS (Department of Health and Human Services)	$422,307	0.1%	Rank history: #96 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
84	Leading Solutions, LLC Top agencies Navy (Department of the Navy)	$421,221	0.1%	Rank history: not on the FY2022 list, #72 in FY2023, #91 in FY2024 and #89 in FY2025; down 7 since FY2020.
85	Abacus Solutions Group LLC Top agencies USAF (Department of the Air Force)	$415,949	0.1%	Rank history: #87 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
86	Decypher Technologies Ltd Top agencies USAF (Department of the Air Force)	$406,874	0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
87	EPN Enterprises, Inc. Top agencies DODEA (Department of Defense Education Activity)	$396,740	0.1%	Rank history: not on the FY2022–FY2025 lists; up 15 since FY2020.
88	Healthtronics Stone Solutions, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$384,775	0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 57 since FY2020.
89	Ridgewood Government Services LLC Top agencies USAF (Department of the Air Force)	$383,736	0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
90	Windwalker Group LLC Top agencies Army (Department of the Army)	$379,962	0.1%	Rank history: #91 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
91	T47 International, Inc. Top agencies Army (Department of the Army)	$371,549	0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
92	D2 Government Solutions, Inc. Top agencies Army (Department of the Army)	$358,505	0.1%	Rank history: #93 in FY2022, #59 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
93	University of Massachusetts Through University of Massachusetts Medical School Top agencies DOJ (Department of Justice)	$311,517	0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
94	Epicc Vascular of Nashville LLC Through Line Science LLC Top agencies VA (Department of Veterans Affairs)	$303,550	0.1%	Rank history: #89 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
95	Ghost RX Inc. Top agencies VA (Department of Veterans Affairs)	$257,670	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	North South Consulting Group LLC Top agencies Army (Department of the Army)	$247,598	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Cherokee Nation Healthcare Services, L.L.C. Top agencies DHA (Defense Health Agency)	$245,218	0.1%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
98	Nationwide Pharmaceutical LLC Top agencies VA (Department of Veterans Affairs)	$244,432	0.1%	Rank history: not on the FY2022–FY2025 lists; up 16 since FY2020.
99	University of New Mexico Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$228,578	<0.1%	Rank history: not on the FY2022–FY2023 lists, #98 in FY2024 and not on the FY2025 list; down 11 since FY2020.
100	Seba Professional Services LLC Top agencies Army (Department of the Army)	$224,429	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.

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100 of 207 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 $471 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 NAICS 621999 contractors in FY2021?

1. STG International, Inc. ($115M), 2. National Marrow Donor Program ($30.9M), 3. Marshfield Clinic Health System, Inc. ($20M), 4. CHS Middle East LLC ($20M), 5. Team Health Inc. ($14.1M), 6. Cognito Systems LLC ($9.56M), 7. Servefed Inc. ($8.79M), 8. American Medical Response, Inc. ($8.78M), 9. Empowered Management Solutions LLC ($8.74M), 10. Indian Health Center of Santa Clara Valley ($8.03M).

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