Top 100 Contractors in PSC F0: Natural Resource Conservation Services, FY2021

Name: Top 100 Contractors in PSC F0: Natural Resource Conservation Services, FY2021
Creator: GovTribe

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

The top 10 won 23% of FY2021 PSC F0 contract dollars

Contract obligations: $1,522,572,045 Net of deobligations, by contracts coded PSC F0 or a code under it
Contractors: 3,467 Parent companies with an obligation
Largest contractor: Perimeter Solutions LP $134 million, 8.0% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Perimeter Solutions LP Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$134,057,255	8.0%	Rank history: #2 in FY2022, #1 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
2	Medvolt Construction Services, LLC Top agencies Army (Department of the Army)	$54,480,536	3.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
3	Arctic Slope Regional Corporation Through Asrc Consulting & Environmental Services, LLC Top agencies DOE (Department of Energy)	$40,802,256	2.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
4	GPC Consolidated Reporting Top agencies USDA (Department of Agriculture)	$29,812,768	1.8%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
5	Delta Land Services LLC Top agencies Army (Department of the Army)	$26,260,302	1.6%	Rank history: #28 in FY2022, #36 in FY2023, not on the FY2024 list and #94 in FY2025; up 99 since FY2020.
6	Management & Engineering Technologies International Inc. Top agencies USDA (Department of Agriculture)	$23,979,816	1.4%	Rank history: #3 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
7	Houston's Too LC Top agencies USDA (Department of Agriculture)	$19,679,427	1.2%	Rank history: #70 in FY2022, #70 in FY2023, #59 in FY2024 and #31 in FY2025; up 28 since FY2020.
8	Big Sky Mobile Catering Corp Top agencies USDA (Department of Agriculture)	$17,796,949	1.1%	Rank history: #38 in FY2022, #54 in FY2023, #42 in FY2024 and #27 in FY2025; up 79 since FY2020.
9	Paramedics Unlimited, LLC Top agencies USDA (Department of Agriculture)	$14,988,237	0.9%	Rank history: not on the FY2022–FY2025 lists; up 184 since FY2020.
10	Aero Spray Inc. Top agencies DOI (Department of the Interior)	$14,606,599	0.9%	Rank history: not on the FY2022–FY2023 lists, #34 in FY2024 and #45 in FY2025; up 52 since FY2020.
11	R & G Food Services Inc. Top agencies USDA (Department of Agriculture)	$13,021,022	0.8%	Rank history: #29 in FY2022, not on the FY2023–FY2024 lists and #82 in FY2025; up 39 since FY2020.
12	Tanaq-Ecm-8A JV Top agencies Army (Department of the Army)	$12,626,580	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
13	Oregon State of 4 awardees, including State of Oregon Department of Fish and Wildlife, Pacific States Marine Fisheries Commission and Oregon Dept of Agriculture Top agencies Army (Department of the Army) Commerce (Department of Commerce) DOI (Department of the Interior)	$12,093,537	0.7%	Rank history: #22 in FY2022, #13 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
14	Neptune Aviation Services, Inc. Top agencies USDA (Department of Agriculture)	$10,443,732	0.6%	Rank history: #11 in FY2022, #17 in FY2023, #8 in FY2024 and #9 in FY2025; down 10 since FY2020.
15	Thunder MTN Catering Inc. Top agencies USDA (Department of Agriculture)	$10,210,748	0.6%	Rank history: #18 in FY2022, #69 in FY2023, #47 in FY2024 and #28 in FY2025; up 21 since FY2020.
16	Adventure Medics LLC Top agencies USDA (Department of Agriculture)	$10,149,613	0.6%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; up 302 since FY2020.
17	Imperial Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$10,131,003	0.6%	Rank history: #20 in FY2022, #15 in FY2023, #25 in FY2024 and #40 in FY2025; down 3 since FY2020.
18	Leisnoi Diversified Services, LLC Top agencies EPA (Environmental Protection Agency)	$10,035,316	0.6%	Rank history: #24 in FY2022, #38 in FY2023, #19 in FY2024 and #61 in FY2025; new, not ranked in FY2020.
19	Tetra Tech, Inc. 4 awardees, including Ard, Inc. and Tetra TECH EC, Inc. Top agencies USAID (US Agency for International Development) USDA (Department of Agriculture) DHS (Department of Homeland Security)	$9,953,365	0.6%	Rank history: #30 in FY2022, #21 in FY2023, #36 in FY2024 and not on the FY2025 list; up 23 since FY2020.
20	G E Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$9,423,557	0.6%	Rank history: #19 in FY2022, #25 in FY2023, #30 in FY2024 and not on the FY2025 list; down 1 since FY2020.
21	Oneida Nation 2 awardees, including Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$9,374,395	0.6%	Rank history: #51 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
22	For Stars Express, Inc. Top agencies USDA (Department of Agriculture)	$9,092,076	0.5%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 202 since FY2020.
23	Summitt Forests, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$8,940,722	0.5%	Rank history: #15 in FY2022, #6 in FY2023, #46 in FY2024 and #60 in FY2025; down 11 since FY2020.
24	Incident Catering Services, LLC Top agencies USDA (Department of Agriculture)	$8,601,461	0.5%	Rank history: #21 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
25	Cutting Edge Forestry, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$8,538,946	0.5%	Rank history: #27 in FY2022, #42 in FY2023, #53 in FY2024 and not on the FY2025 list; up 30 since FY2020.
26	Aero-Flite, Inc. Top agencies USDA (Department of Agriculture)	$8,265,977	0.5%	Rank history: not on the FY2022 list, #32 in FY2023, #9 in FY2024 and #13 in FY2025; down 24 since FY2020.
27	Sweat US LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior) USAF (Department of the Air Force)	$7,944,201	0.5%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; down 10 since FY2020.
28	OC Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$7,835,511	0.5%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; up 4 since FY2020.
29	Hgl-Aptim JV LLC Top agencies Army (Department of the Army)	$7,790,508	0.5%	Rank history: #54 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
30	A.i.s., Inc. Top agencies Commerce (Department of Commerce)	$7,571,448	0.5%	Rank history: #47 in FY2022, #71 in FY2023, #29 in FY2024 and #39 in FY2025; down 7 since FY2020.
31	D F Zee's Firefighting Catering, LLC Top agencies USDA (Department of Agriculture)	$7,450,412	0.4%	Rank history: #61 in FY2022, not on the FY2023–FY2024 lists and #98 in FY2025; up 132 since FY2020.
32	Crewzers Fire Crew Transport Inc. Top agencies USDA (Department of Agriculture)	$7,289,224	0.4%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; up 78 since FY2020.
33	Stewart's Firefighter Food Catering, Inc. Top agencies USDA (Department of Agriculture)	$7,287,068	0.4%	Rank history: #97 in FY2022, #61 in FY2023, #97 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
34	Bishop Services, Inc. Top agencies USDA (Department of Agriculture)	$7,216,806	0.4%	Rank history: not on the FY2022–FY2025 lists; up 137 since FY2020.
35	Dynamic Aviation Group, Inc. Top agencies USDA (Department of Agriculture)	$6,836,789	0.4%	Rank history: #34 in FY2022, #67 in FY2023, #67 in FY2024 and #34 in FY2025; down 13 since FY2020.
36	Technical and Engineering Support Alliance, LLC Top agencies Commerce (Department of Commerce)	$6,836,183	0.4%	Rank history: not on the FY2022 list, #57 in FY2023, #89 in FY2024 and not on the FY2025 list; up 46 since FY2020.
37	Guardian Environmental Services Co Inc. Top agencies EPA (Environmental Protection Agency)	$6,788,980	0.4%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
38	Scofield Catering & Management Inc. Top agencies USDA (Department of Agriculture)	$6,633,483	0.4%	Rank history: not on the FY2022–FY2025 lists; up 106 since FY2020.
39	Hdr, Inc. 2 awardees, including HDR Environmental, Operations and Construction, Inc. Top agencies Navy (Department of the Navy)	$6,551,836	0.4%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
40	North Slope Catering, LLC Top agencies USDA (Department of Agriculture)	$6,521,525	0.4%	Rank history: not on the FY2022–FY2025 lists; up 87 since FY2020.
41	Aero Air, LLC Top agencies USDA (Department of Agriculture)	$6,498,649	0.4%	Rank history: not on the FY2022 list, #28 in FY2023, #6 in FY2024 and #6 in FY2025; down 30 since FY2020.
42	Fireline Medics LLC Top agencies USDA (Department of Agriculture)	$6,445,942	0.4%	Rank history: not on the FY2022–FY2025 lists; up 150 since FY2020.
43	Calista Corp Through Brice Environmental Services Corporation Top agencies Army (Department of the Army)	$6,293,415	0.4%	Rank history: #73 in FY2022, #76 in FY2023 and not on the FY2024–FY2025 lists; down 38 since FY2020.
44	Franco Reforestation Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$6,171,553	0.4%	Rank history: #52 in FY2022, #41 in FY2023, #90 in FY2024 and #67 in FY2025; down 17 since FY2020.
45	The Lake Group Inc. Top agencies USDA (Department of Agriculture)	$6,136,053	0.4%	Rank history: not on the FY2022–FY2025 lists; up 50 since FY2020.
46	Helicopter Express LLC Top agencies USDA (Department of Agriculture)	$5,936,915	0.4%	Rank history: #6 in FY2022, #12 in FY2023, #2 in FY2024 and #2 in FY2025; down 37 since FY2020.
47	Miller Timber Services, Inc. Top agencies USDA (Department of Agriculture)	$5,838,636	0.3%	Rank history: #23 in FY2022, #48 in FY2023, #50 in FY2024 and #25 in FY2025; down 4 since FY2020.
48	J3 Contracting, Inc. Top agencies USDA (Department of Agriculture)	$5,690,770	0.3%	Rank history: #62 in FY2022, not on the FY2023 list, #60 in FY2024 and #86 in FY2025; down 7 since FY2020.
49	Broken Arrow Horse & Cattle Company LLC Top agencies DOI (Department of the Interior)	$5,420,000	0.3%	Rank history: not on the FY2022–FY2025 lists; down 11 since FY2020.
50	The Davey Tree Expert Company 3 awardees, including Davey Tree Surgery Company and Davey Resource Group, Inc. Top agencies USDA (Department of Agriculture) DOE (Department of Energy) DOI (Department of the Interior)	$5,381,768	0.3%	Rank history: #86 in FY2022 and not on the FY2023–FY2025 lists; up 26 since FY2020.
51	Lynker Corporation Top agencies Commerce (Department of Commerce)	$5,266,854	0.3%	Rank history: #65 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; down 27 since FY2020.
52	CLT Logging Inc. Top agencies USDA (Department of Agriculture)	$5,231,530	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Saltwater Inc. Top agencies Commerce (Department of Commerce)	$5,117,943	0.3%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
54	Olgoonik Corporation Through FPM Remediations, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$5,076,004	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	10 Tanker Air Carrier, LLC Top agencies USDA (Department of Agriculture)	$5,065,621	0.3%	Rank history: #12 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; down 48 since FY2020.
56	Wilderness Medics, Inc. Top agencies USDA (Department of Agriculture)	$4,808,709	0.3%	Rank history: #77 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
57	Fire Dawg Green, Inc. Top agencies USDA (Department of Agriculture)	$4,773,870	0.3%	Rank history: not on the FY2022–FY2025 lists; up 160 since FY2020.
58	Natives of Kodiak, Incorporated Through Environmental Assessment Services, LLC Top agencies Commerce (Department of Commerce) Navy (Department of the Navy) Army (Department of the Army)	$4,769,221	0.3%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
59	JD Bravo Co Inc. Top agencies Army (Department of the Army)	$4,641,156	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Intents Emergency Response LLC Top agencies USDA (Department of Agriculture)	$4,634,266	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Corrections Colorado Department of 3 awardees, including Colorado Department of Corrections, Colorado Department of Natural Resources and Colorado Department of Public Safety Top agencies DOI (Department of the Interior)	$4,545,000	0.3%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; down 15 since FY2020.
62	Outback Firefighting, Inc. Top agencies USDA (Department of Agriculture)	$4,472,058	0.3%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; up 51 since FY2020.
63	Quicksilver Contracting Co Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$4,399,901	0.3%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
64	Cattlemen's Meat Company Top agencies USDA (Department of Agriculture)	$4,207,897	0.3%	Rank history: not on the FY2022–FY2025 lists; up 132 since FY2020.
65	AAA Mobile Basecamp, LLC Top agencies USDA (Department of Agriculture)	$4,139,873	0.2%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 59 since FY2020.
66	Yellowstone Kellys Inc. Top agencies USDA (Department of Agriculture)	$3,941,901	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Front Line Ems LLC Top agencies USDA (Department of Agriculture)	$3,824,727	0.2%	Rank history: #89 in FY2022 and not on the FY2023–FY2025 lists; up 233 since FY2020.
68	MP Forestry, Incorporated Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$3,813,418	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
69	Heliqwest International Inc. Top agencies USDA (Department of Agriculture)	$3,765,293	0.2%	Rank history: #25 in FY2022, not on the FY2023 list, #55 in FY2024 and #55 in FY2025; down 56 since FY2020.
70	20 West, LLC Top agencies DOI (Department of the Interior)	$3,759,940	0.2%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
71	Buchanan Consulting Services LLC Top agencies USDA (Department of Agriculture)	$3,649,196	0.2%	Rank history: not on the FY2022–FY2025 lists; down 26 since FY2020.
72	International Business Sales and Services Corp Top agencies Commerce (Department of Commerce)	$3,615,836	0.2%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
73	C.t.l. Forest Management, Inc. Top agencies USDA (Department of Agriculture)	$3,571,672	0.2%	Rank history: not on the FY2022–FY2023 lists, #58 in FY2024 and not on the FY2025 list; up 68 since FY2020.
74	Despain, Kerry, M Top agencies DOI (Department of the Interior)	$3,446,844	0.2%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and #78 in FY2025; down 20 since FY2020.
75	West Forest, Inc. Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$3,419,480	0.2%	Rank history: not on the FY2022 list, #81 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
76	Research Triangle Institute Top agencies Commerce (Department of Commerce)	$3,234,975	0.2%	Rank history: not on the FY2022–FY2025 lists; up 52 since FY2020.
77	JIM Johnson Logging, Inc. Top agencies USDA (Department of Agriculture)	$3,204,203	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
78	Axsus Enterprises LLC Top agencies USDA (Department of Agriculture)	$3,195,814	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	State of California Controllers Office 6 awardees, including California Department of Fish & Wildlife, California Conservation Corps and California Department of Forestry and Fire Protection Top agencies DOI (Department of the Interior) USDA (Department of Agriculture) Army (Department of the Army)	$3,173,537	0.2%	Rank history: #85 in FY2022 and not on the FY2023–FY2025 lists; down 61 since FY2020.
80	Rough Country Response LLC Top agencies USDA (Department of Agriculture)	$3,163,967	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	ESP Tunica Opportunities LLC Top agencies Army (Department of the Army)	$3,086,688	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	US West Corp Top agencies Army (Department of the Army)	$2,924,368	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Omalley Brothers Corp Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$2,897,914	0.2%	Rank history: not on the FY2022–FY2023 lists, #32 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
84	State of Arizona 2 awardees, including Department of Corrections Arizona and Arizona Dept of Game and Fish Top agencies DOI (Department of the Interior) Army (Department of the Army)	$2,884,035	0.2%	Rank history: not on the FY2022–FY2025 lists; up 83 since FY2020.
85	J.w. Bamford, Inc. Top agencies USDA (Department of Agriculture)	$2,840,312	0.2%	Rank history: not on the FY2022–FY2025 lists; down 24 since FY2020.
86	Best Practice Medicine LLC Top agencies USDA (Department of Agriculture)	$2,827,434	0.2%	Rank history: not on the FY2022–FY2025 lists; up 335 since FY2020.
87	Top Gun Lighting and Industrial Supplies, LLC Top agencies USDA (Department of Agriculture)	$2,729,847	0.2%	Rank history: #49 in FY2022, #74 in FY2023 and not on the FY2024–FY2025 lists; down 4 since FY2020.
88	Hillsboro Aviation, Inc. Top agencies USDA (Department of Agriculture)	$2,709,649	0.2%	Rank history: #35 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; down 67 since FY2020.
89	Leading Edge Aviation, LLC Top agencies DOI (Department of the Interior) USDA (Department of Agriculture)	$2,705,934	0.2%	Rank history: not on the FY2022–FY2025 lists; up 149 since FY2020.
90	Kailas, Corp. Top agencies DOI (Department of the Interior)	$2,698,450	0.2%	Rank history: not on the FY2022–FY2025 lists; down 51 since FY2020.
91	Kemron Environmental Services, Inc. Top agencies Army (Department of the Army)	$2,688,773	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies DOI (Department of the Interior) Commerce (Department of Commerce) Army (Department of the Army)	$2,676,007	0.2%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
93	Mud Lake Oil Inc. Top agencies USDA (Department of Agriculture)	$2,663,595	0.2%	Rank history: not on the FY2022–FY2025 lists; up 53 since FY2020.
94	Air Spray USA Inc. Top agencies DOI (Department of the Interior)	$2,656,029	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	AAA Mobile Solutions Inc. Top agencies USDA (Department of Agriculture)	$2,647,364	0.2%	Rank history: not on the FY2022–FY2025 lists; up 53 since FY2020.
96	Discount Tree Service, Incorporated Top agencies Army (Department of the Army)	$2,601,604	0.2%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
97	Hoolaulima Government Solutions, LLC Top agencies Army (Department of the Army)	$2,574,120	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Frontline Medical LLC Top agencies USDA (Department of Agriculture)	$2,542,551	0.2%	Rank history: not on the FY2022–FY2025 lists; up 77 since FY2020.
99	Tenax Aerospace LLC Top agencies USDA (Department of Agriculture)	$2,538,106	0.2%	Rank history: not on the FY2022–FY2024 lists and #11 in FY2025; down 31 since FY2020.
100	Kmea Through Patriot Joint Venture Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$2,410,320	0.1%	Rank history: not on the FY2022–FY2025 lists; down 71 since FY2020.

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100 of 3,467 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC F0

Code	Net obligations	Largest contractor
F003 Forest/Range Fire Suppression/Presuppression Services	$840,513,373	Perimeter Solutions LP
F099 Other Natural Resources and Conservation Services	$168,804,288	Delta Land Services LLC
F021 Site Preparation	$87,238,941	Medvolt Construction Services, LLC
F014 Tree Thinning Services	$84,460,773	G E Forestry, Inc.
F016 Wildhorse/Burro Control Services	$62,452,154	Broken Arrow Horse & Cattle Company LLC
F018 Other Range/Forest Improvements Services (non-construction)	$61,721,097	Management & Engineering Technologies International Inc.
F020 Fisheries Resources Management Services	$60,476,757	A.i.s., Inc.
F015 Well Drilling/Exploratory Services	$45,074,375	Arctic Slope Regional Corporation
F006 Land Treatment Practices Services (plowing/clearing, etc.)	$24,334,549	Southwest Contracting & Associates LLC
F001 Aerial Fertilization/Spraying Services	$15,994,475	Dynamic Aviation Group, Inc.
F005 Forest Tree Planting Services	$14,479,061	OC Forestry, Incorporated
F019 Other Wildlife Management Services	$14,334,232	Hoolaulima Government Solutions, LLC
F004 Forest/Range Fire Rehabilitation Services (non-construction)	$10,952,603	Summitt Forests, Inc.
F008 Recreation Site Maintenance Services (non-construction)	$4,624,554	Four Peaks Environmental Science & Data Solutions LLC
F009 Seed Collection/Production Services	$2,607,509	Quality Forests, Inc.

How this ranking works

Source: every contract action FPDS records (as published on SAM.gov) in the period, as GovTribe received it.
Amounts are net obligations: what was obligated, less what was deobligated. Shares are of $1.67 billion obligated before deobligations, so they never pass 100%.
Parent companies: each action counts under the ultimate parent its award record names, or under the awardee when it names none, so no dollar counts twice. Parents of the same name (Inc., LLC and the like aside) count as one company, since FPDS records a company's parent under more than one UEI over time. GovTribe corrects a few parents and names by hand; see the corrections.
Fiscal year 2021 ran Oct 1, 2020 – Sep 30, 2021. The Department of Defense reports its contract actions to FPDS about 90 days late, so a fiscal year is ranked once they're in, in February, and the list doesn't change after.
Rank changes compare with FY2020. "New" marks a company outside that period's top 500, and "Returned" one of those that was on an earlier fiscal year's list.
Rank lines show each company's rank on every fiscal year's list since FY2021, #1 at the top, on a scale that gives the top of the list more room. A dashed stretch spans years it wasn't on the list. The step from FY2020 takes the color of the rank change beside it.
Placeholder recipients FPDS uses when it names no company ("Miscellaneous Foreign Contractors" and the like) aren't ranked.

Quick answers

Who were the top 10 PSC F0 contractors in FY2021?

1. Perimeter Solutions LP ($134M), 2. Medvolt Construction Services, LLC ($54.5M), 3. Arctic Slope Regional Corporation ($40.8M), 4. GPC Consolidated Reporting ($29.8M), 5. Delta Land Services LLC ($26.3M), 6. Management & Engineering Technologies International Inc. ($24M), 7. Houston's Too LC ($19.7M), 8. Big Sky Mobile Catering Corp ($17.8M), 9. Paramedics Unlimited, LLC ($15M), 10. Aero Spray Inc. ($14.6M).

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