Top 100 Contractors in NAICS 6213: Offices of Other Health Practitioners, FY2021

Name: Top 100 Contractors in NAICS 6213: Offices of Other Health Practitioners, FY2021
Creator: GovTribe

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

The top 10 won 47% of FY2021 NAICS 6213 contract dollars

Contract obligations: $349,007,016 Net of deobligations, by contracts coded NAICS 6213 or a code under it
Contractors: 526 Parent companies with an obligation
Largest contractor: Kbr, Inc. $93.7 million, 22.9% 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	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies USSOCOM (United States Special Operations Command)	$93,702,420	22.9%	Rank history: #1 in FY2022, #1 in FY2023, #3 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	STS Solutions and Training, LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$20,449,152	5.0%	Rank history: #5 in FY2022, #3 in FY2023, #10 in FY2024 and not on the FY2025 list; up 2 since FY2020.
3	Giacare & Medtrust JV LLC Top agencies Army (Department of the Army)	$20,278,677	5.0%	Rank history: #2 in FY2022, #2 in FY2023, #2 in FY2024 and #2 in FY2025; down 1 since FY2020.
4	Wisestaff, LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$10,905,616	2.7%	Rank history: #3 in FY2022, #6 in FY2023, #5 in FY2024 and #4 in FY2025; up 95 since FY2020.
5	Prairie Quest, Inc. Top agencies USAF (Department of the Air Force) DHA (Defense Health Agency)	$9,745,764	2.4%	Rank history: #8 in FY2022, #4 in FY2023, #4 in FY2024 and #5 in FY2025; up 1 since FY2020.
6	Integrated Medical Solutions, LLC Top agencies DOJ (Department of Justice)	$9,692,102	2.4%	Rank history: not on the FY2022–FY2024 lists and #39 in FY2025; up 2 since FY2020.
7	LMR Technical Group LLC Top agencies USAF (Department of the Air Force)	$8,004,537	2.0%	Rank history: #7 in FY2022, #9 in FY2023, #9 in FY2024 and #16 in FY2025; up 3 since FY2020.
8	The Tatitlek Corporation Through Tatitlek Federal Services LLC Top agencies Army (Department of the Army)	$7,933,377	1.9%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
9	Reef Systems Corp Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$7,141,954	1.7%	Rank history: #10 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
10	Cherokee Nation Operational Solutions, L.L.C. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$5,606,819	1.4%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
11	Reef Systems-Fsr LLC Top agencies USAF (Department of the Air Force)	$5,310,487	1.3%	Rank history: #13 in FY2022, #14 in FY2023, #75 in FY2024 and not on the FY2025 list; up 1 since FY2020.
12	Rosato Associates, Inc. Top agencies VA (Department of Veterans Affairs)	$4,909,355	1.2%	Rank history: #23 in FY2022, #21 in FY2023, #22 in FY2024 and #19 in FY2025; down 1 since FY2020.
13	Duke University Top agencies HHS (Department of Health and Human Services)	$4,371,915	1.1%	Rank history: #20 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
14	AB Staffing Solutions LLC Top agencies HHS (Department of Health and Human Services)	$4,335,531	1.1%	Rank history: #6 in FY2022, #31 in FY2023, #35 in FY2024 and not on the FY2025 list; up 60 since FY2020.
15	Northwell Health, Inc. Through North Shore University Hospital Top agencies DOT (Department of Transportation)	$3,763,980	0.9%	Rank history: #19 in FY2022, #16 in FY2023, #20 in FY2024 and #11 in FY2025; up 14 since FY2020.
16	Magnum Medical Overseas JV LLC Top agencies DHA (Defense Health Agency)	$3,432,002	0.8%	Rank history: #17 in FY2022, #12 in FY2023, not on the FY2024 list and #27 in FY2025; down 2 since FY2020.
17	The Chenega Corporation 4 awardees, including Chenega Reliable Services LLC Top agencies Army (Department of the Army)	$3,218,134	0.8%	Rank history: #21 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 28 since FY2020.
18	Loyal Source Government Services LLC Top agencies VA (Department of Veterans Affairs)	$3,068,156	0.7%	Rank history: #66 in FY2022, #87 in FY2023, #17 in FY2024 and #29 in FY2025; new, not ranked in FY2020.
19	Duro Health LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,009,873	0.7%	Rank history: #26 in FY2022, #22 in FY2023, #26 in FY2024 and #30 in FY2025; down 3 since FY2020.
20	Appddictionstudio Limited Liability Company Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,932,912	0.7%	Rank history: #28 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
21	Photon Physics Services Top agencies VA (Department of Veterans Affairs)	$2,557,581	0.6%	Rank history: #22 in FY2022, #23 in FY2023, #37 in FY2024 and #45 in FY2025; unchanged since FY2020.
22	Cape Fox Facilities Services, LLC Top agencies Army (Department of the Army)	$2,464,231	0.6%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
23	Robison Medical Resource Group LLC Top agencies HHS (Department of Health and Human Services)	$2,382,300	0.6%	Rank history: #4 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
24	Childrens Hospital Medical Center Top agencies HHS (Department of Health and Human Services)	$2,362,356	0.6%	Rank history: #72 in FY2022 and not on the FY2023–FY2025 lists; up 65 since FY2020.
25	WJM Professional Services LLC Top agencies Army (Department of the Army)	$2,361,427	0.6%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
26	Wesley Medical Staffing, Inc. Top agencies HHS (Department of Health and Human Services)	$2,329,648	0.6%	Rank history: #9 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
27	Aide & Healthcare Staffing Solutions LLC Top agencies Army (Department of the Army)	$2,033,278	0.5%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
28	Front Line Ems LLC Top agencies HHS (Department of Health and Human Services)	$2,016,125	0.5%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
29	Prairie Band Health Services Inc. Top agencies HHS (Department of Health and Human Services)	$2,014,930	0.5%	Rank history: #18 in FY2022, #15 in FY2023, #15 in FY2024 and not on the FY2025 list; up 103 since FY2020.
30	One Stop Recruiting LLC Top agencies VA (Department of Veterans Affairs)	$1,949,990	0.5%	Rank history: #38 in FY2022, #34 in FY2023, #48 in FY2024 and #31 in FY2025; up 19 since FY2020.
31	Leota Professional Resources, LLC Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$1,792,936	0.4%	Rank history: #30 in FY2022, #28 in FY2023, #53 in FY2024 and #59 in FY2025; down 8 since FY2020.
32	Wong Pharmacy Services, Inc. Top agencies VA (Department of Veterans Affairs)	$1,739,617	0.4%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
33	The Vanderbilt University Top agencies HHS (Department of Health and Human Services)	$1,687,387	0.4%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
34	Onesourcepcs, LLC Top agencies USAF (Department of the Air Force)	$1,661,564	0.4%	Rank history: #36 in FY2022, #43 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
35	PM Connections LLC Top agencies DHA (Defense Health Agency)	$1,658,866	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Venesco LLC Top agencies Army (Department of the Army)	$1,545,692	0.4%	Rank history: not on the FY2022–FY2025 lists; down 19 since FY2020.
37	The Johns Hopkins University Top agencies HHS (Department of Health and Human Services)	$1,515,550	0.4%	Rank history: not on the FY2022–FY2025 lists; up 43 since FY2020.
38	Vortex Solutions, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$1,497,318	0.4%	Rank history: #35 in FY2022, #45 in FY2023, #85 in FY2024 and not on the FY2025 list; down 8 since FY2020.
39	Ajanta Consulting LLC Top agencies Army (Department of the Army) DHA (Defense Health Agency)	$1,486,311	0.4%	Rank history: #24 in FY2022, #20 in FY2023, #24 in FY2024 and #52 in FY2025; new, not ranked in FY2020.
40	Hoolaulima Government Solutions, LLC Top agencies Army (Department of the Army)	$1,469,373	0.4%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; down 14 since FY2020.
41	Magellan Health, Inc. Through Magellan Healthcare Inc. Top agencies DOT (Department of Transportation)	$1,452,547	0.4%	Rank history: #54 in FY2022, #56 in FY2023, #52 in FY2024 and #72 in FY2025; down 8 since FY2020.
42	Posterity Group LLC Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$1,413,186	0.3%	Rank history: not on the FY2022–FY2025 lists; down 24 since FY2020.
43	Lumbee Tribe Enterprises LLC Top agencies Army (Department of the Army)	$1,409,529	0.3%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
44	The Right Solution, Inc. Top agencies USDA (Department of Agriculture)	$1,392,601	0.3%	Rank history: #61 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; down 13 since FY2020.
45	Service Connected Technologies, LLC Top agencies VA (Department of Veterans Affairs)	$1,349,950	0.3%	Rank history: not on the FY2022–FY2025 lists; up 53 since FY2020.
46	Palisade-Heritage JV LLC Top agencies VA (Department of Veterans Affairs)	$1,346,455	0.3%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
47	Choctaw Nation of Oklahoma Through Choctaw Defense Munitions, LLC Top agencies Army (Department of the Army)	$1,312,104	0.3%	Rank history: #43 in FY2022, #47 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
48	Emerge Solutions Group LLC Top agencies VA (Department of Veterans Affairs)	$1,243,523	0.3%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
49	Interagency Readiness Solutions, LLC Top agencies Army (Department of the Army)	$1,240,466	0.3%	Rank history: #52 in FY2022, #46 in FY2023, #77 in FY2024 and not on the FY2025 list; down 14 since FY2020.
50	Maxmed Saratoga JV LLC Top agencies Army (Department of the Army)	$1,178,870	0.3%	Rank history: #71 in FY2022, #50 in FY2023, #100 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
51	Leading Edge Enterprises, LLC Top agencies USAF (Department of the Air Force)	$1,135,511	0.3%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
52	Innovative Management Strategists, LLC Top agencies OSD (Office of the Secretary of Defense)	$1,134,556	0.3%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; up 56 since FY2020.
53	Sequoyah Staffing Agency, LLC Top agencies HHS (Department of Health and Human Services)	$1,060,646	0.3%	Rank history: #45 in FY2022, #18 in FY2023, #47 in FY2024 and not on the FY2025 list; up 105 since FY2020.
54	Compass Medical Provider LLC Top agencies Army (Department of the Army)	$1,028,186	0.3%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; up 18 since FY2020.
55	SRL Total Source LLC Top agencies Army (Department of the Army)	$1,011,893	0.2%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
56	Chloeta Holdings LLC Top agencies HHS (Department of Health and Human Services)	$1,002,570	0.2%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
57	O2X Human Performance, LLC Top agencies Army (Department of the Army)	$995,500	0.2%	Rank history: #94 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
58	Boston Medical Center Corporation Top agencies HHS (Department of Health and Human Services)	$973,419	0.2%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
59	Berufsgenossenschaftlicher Arbeitsmedizinischer UND Sicherhe Through BG Prevent GMBH Top agencies Army (Department of the Army)	$944,374	0.2%	Rank history: #68 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
60	Loveland Services LLC Top agencies USAF (Department of the Air Force)	$936,808	0.2%	Rank history: not on the FY2022 list, #82 in FY2023, #88 in FY2024 and not on the FY2025 list; down 17 since FY2020.
61	GTB Health Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$897,461	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
62	Frontline National LLC Top agencies Army (Department of the Army) DOJ (Department of Justice) USAF (Department of the Air Force)	$895,219	0.2%	Rank history: not on the FY2022 list, #86 in FY2023, #90 in FY2024 and #89 in FY2025; down 11 since FY2020.
63	Evt, Inc. Top agencies VA (Department of Veterans Affairs)	$863,323	0.2%	Rank history: not on the FY2022–FY2025 lists; up 157 since FY2020.
64	The Center for Clinical and Forensic Services Inc. Top agencies CSOSA (Court Services and Offender Supervision Agency)	$860,742	0.2%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; down 26 since FY2020.
65	Circulatory Services Inc. Top agencies VA (Department of Veterans Affairs)	$854,980	0.2%	Rank history: #60 in FY2022, #65 in FY2023, #69 in FY2024 and #62 in FY2025; up 28 since FY2020.
66	Seba Professional Services LLC Top agencies Army (Department of the Army)	$837,756	0.2%	Rank history: #65 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
67	Team Health Inc. 2 awardees, including Spectrum Federal Solutions LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) WHS (DOD Washington Headquarters Service)	$816,191	0.2%	Rank history: #11 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; down 64 since FY2020.
68	El Paso-Southwestern Cardiovascular Associates, P.a. Top agencies Army (Department of the Army)	$815,500	0.2%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
69	United Anesthesia Associates Inc. Top agencies HHS (Department of Health and Human Services)	$810,828	0.2%	Rank history: #75 in FY2022, #71 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
70	Lifehealth, LLC Top agencies Army (Department of the Army)	$794,322	0.2%	Rank history: #84 in FY2022 and not on the FY2023–FY2025 lists; down 15 since FY2020.
71	H4 Enterprises LLC Top agencies DHA (Defense Health Agency)	$793,958	0.2%	Rank history: #79 in FY2022, #81 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
72	Laredo Technical Services, Inc. Top agencies Army (Department of the Army)	$773,314	0.2%	Rank history: #70 in FY2022, #57 in FY2023, #25 in FY2024 and #18 in FY2025; down 24 since FY2020.
73	Aspire Therapy Services and Consultants, Inc. Top agencies VA (Department of Veterans Affairs) USAF (Department of the Air Force)	$767,707	0.2%	Rank history: #91 in FY2022, #54 in FY2023, #64 in FY2024 and #58 in FY2025; new, not ranked in FY2020.
74	Ausdanbrook Properties Inc. Top agencies Army (Department of the Army)	$766,470	0.2%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; down 32 since FY2020.
75	Palo Alto Perfusion Services Inc. Top agencies VA (Department of Veterans Affairs)	$756,669	0.2%	Rank history: #80 in FY2022, #72 in FY2023, #71 in FY2024 and #43 in FY2025; up 39 since FY2020.
76	Advanced Decision Vectors LLC Top agencies USAF (Department of the Air Force)	$742,108	0.2%	Rank history: not on the FY2022–FY2025 lists; down 18 since FY2020.
77	Kaiser Foundation Health Plan of Washington Through Kaiser Foundation Hospitals Top agencies HHS (Department of Health and Human Services)	$738,532	0.2%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; up 140 since FY2020.
78	Sanford Federal, Inc. Top agencies DFAS (Defense Finance and Accounting Service) DISA (Defense Information Systems Agency)	$728,738	0.2%	Rank history: #67 in FY2022, #36 in FY2023, #72 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
79	Testudo Logistics LLC Top agencies USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$710,294	0.2%	Rank history: #76 in FY2022, #53 in FY2023, #29 in FY2024 and #34 in FY2025; down 23 since FY2020.
80	Golden Gate Perfusion, Inc. Top agencies VA (Department of Veterans Affairs)	$698,206	0.2%	Rank history: #59 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
81	Sterling Medical Corporation Through Sterling Medical Associates, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$692,081	0.2%	Rank history: #63 in FY2022, #99 in FY2023, #94 in FY2024 and not on the FY2025 list; down 13 since FY2020.
82	Dt-Trak Consulting, Inc. Top agencies HHS (Department of Health and Human Services)	$682,955	0.2%	Rank history: #48 in FY2022, #39 in FY2023, #16 in FY2024 and #14 in FY2025; up 286 since FY2020.
83	Real-Time 2 LLC Top agencies Army (Department of the Army)	$677,842	0.2%	Rank history: #81 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; down 17 since FY2020.
84	The Trustees of Columbia University In the City of New York Top agencies HHS (Department of Health and Human Services)	$676,203	0.2%	Rank history: #69 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
85	Stability Staffing & Consulting LLC Top agencies Army (Department of the Army)	$659,449	0.2%	Rank history: not on the FY2022–FY2025 lists; down 31 since FY2020.
86	Special Psychological Applications Corporation Top agencies USSOCOM (United States Special Operations Command)	$653,156	0.2%	Rank history: #50 in FY2022, #58 in FY2023, #42 in FY2024 and not on the FY2025 list; down 52 since FY2020.
87	Giacare Inc. Top agencies Army (Department of the Army)	$634,654	0.2%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
88	E-9 Enterprises, LLC Top agencies Army (Department of the Army)	$625,581	0.2%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; down 13 since FY2020.
89	Akahi Associates LLC Top agencies USAF (Department of the Air Force)	$611,712	0.1%	Rank history: #88 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; down 22 since FY2020.
90	Synergy Staffing Inc. Top agencies Army (Department of the Army)	$611,652	0.1%	Rank history: #57 in FY2022, #98 in FY2023, #73 in FY2024 and not on the FY2025 list; unchanged since FY2020.
91	A2A Integrated Logistics Inc. Top agencies VA (Department of Veterans Affairs)	$601,385	0.1%	Rank history: not on the FY2022 list, #67 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
92	Mid-Atlantic Children's Services, Inc. Top agencies CSOSA (Court Services and Offender Supervision Agency)	$584,900	0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
93	Versability Resources, Inc. Top agencies Navy (Department of the Navy)	$547,566	0.1%	Rank history: #55 in FY2022, #55 in FY2023, #60 in FY2024 and #49 in FY2025; down 54 since FY2020.
94	Ccs-Mesa Blood Management LLC Top agencies VA (Department of Veterans Affairs)	$527,307	0.1%	Rank history: not on the FY2022–FY2025 lists; up 102 since FY2020.
95	Management Enterprise Development & Services Inc. Top agencies Army (Department of the Army)	$504,672	0.1%	Rank history: not on the FY2022–FY2025 lists; down 55 since FY2020.
96	Graham Technologies LLC Top agencies Army (Department of the Army)	$495,285	0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
97	Medcare Staffing, Inc. Top agencies HHS (Department of Health and Human Services)	$492,440	0.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
98	Logzone Inc. Top agencies USAF (Department of the Air Force)	$476,137	0.1%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
99	Entourage Consulting LLC Top agencies USAF (Department of the Air Force)	$473,667	0.1%	Rank history: not on the FY2022–FY2025 lists; down 22 since FY2020.
100	Millbrook Support Services Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$465,480	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 526 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 6213

Code	Net obligations	Largest contractor
62139 Offices of All Other Health Practitioners	$165,104,970	Giacare & Medtrust JV LLC
62134 Offices of Physical, Occupational and Speech Therapists, and Audiologists	$156,035,751	Kbr, Inc.
62133 Offices of Mental Health Practitioners (except Physicians)	$22,481,090	Cape Fox Facilities Services, LLC

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 $409 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 6213 contractors in FY2021?

1. Kbr, Inc. ($93.7M), 2. STS Solutions and Training, LLC ($20.4M), 3. Giacare & Medtrust JV LLC ($20.3M), 4. Wisestaff, LLC ($10.9M), 5. Prairie Quest, Inc. ($9.75M), 6. Integrated Medical Solutions, LLC ($9.69M), 7. LMR Technical Group LLC ($8M), 8. The Tatitlek Corporation ($7.93M), 9. Reef Systems Corp ($7.14M), 10. Cherokee Nation Operational Solutions, L.L.C. ($5.61M).

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