Top 100 Contractors in PSC C211: Architect – Engineer Services (including landscaping, interior layout, and designing), FY2021

Name: Top 100 Contractors in PSC C211: Architect – Engineer Services (including landscaping, interior layout, and designing), FY2021
Creator: GovTribe

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

The top 10 won 31% of FY2021 PSC C211 contract dollars

Contract obligations: $1,065,791,555 Net of deobligations, by contracts coded PSC C211
Contractors: 670 Parent companies with an obligation
Largest contractor: AECOM $84.3 million, 7.4% 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	AECOM 22 awardees, including AECOM Technical Services, Inc., Aecom-Baker-Cardno Navfac Atlantic Planning JV and Aecom-Baker Navfac Atlantic A-E Design JV Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$84,291,912	7.4%	Rank history: #1 in FY2022, #1 in FY2023, #7 in FY2024 and #7 in FY2025; unchanged since FY2020.
2	Hdr, Inc. 21 awardees, including Hdr-Gannett Fleming JV, HDR Environmental, Operations and Construction, Inc. and HDR Engineering, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$79,877,588	7.0%	Rank history: #2 in FY2022, #3 in FY2023, #4 in FY2024 and #1 in FY2025; unchanged since FY2020.
3	Jacobs Engineering Group Inc. 21 awardees, including Jacobs Government Services Co and Ch2M Hill - HDR JV Top agencies Army (Department of the Army) DOT (Department of Transportation) USAF (Department of the Air Force)	$38,062,302	3.3%	Rank history: #9 in FY2022, #8 in FY2023, #50 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Burns & Mcdonnell, Inc. 3 awardees, including Burns & Mcdonnell Engineering Company, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$33,494,671	2.9%	Rank history: #5 in FY2022, #2 in FY2023, #13 in FY2024 and not on the FY2025 list; up 7 since FY2020.
5	Tetra Tech, Inc. 12 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) DECA (Defense Commissary Agency)	$32,462,415	2.8%	Rank history: #7 in FY2022, #5 in FY2023, #12 in FY2024 and #6 in FY2025; down 1 since FY2020.
6	Michael Baker International, LLC 7 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy) USAF (Department of the Air Force)	$22,157,896	1.9%	Rank history: #8 in FY2022, #10 in FY2023, #6 in FY2024 and not on the FY2025 list; up 24 since FY2020.
7	SC Companies, Inc. 2 awardees, including Stanley Consultants, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$19,774,106	1.7%	Rank history: #3 in FY2022, #15 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
8	Parsons Corporation 3 awardees, including Parsons-Versar Joint Venture and Parsons Government Services Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force) Navy (Department of the Navy)	$19,005,920	1.7%	Rank history: #10 in FY2022, #12 in FY2023, #20 in FY2024 and #9 in FY2025; down 3 since FY2020.
9	Jacobs Government Services Company 2 awardees Top agencies DOI (Department of the Interior) DOS (Department of State) Navy (Department of the Navy)	$15,418,481	1.3%	Rank history: #19 in FY2022, #13 in FY2023, #3 in FY2024 and #3 in FY2025; up 3 since FY2020.
10	Baker Jacobs JV Top agencies Army (Department of the Army)	$15,353,312	1.3%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
11	Black & Veatch Special Projects Corp. Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$15,000,620	1.3%	Rank history: not on the FY2022 list, #38 in FY2023, #49 in FY2024 and not on the FY2025 list; up 32 since FY2020.
12	MPR Associates, Inc. Top agencies Army (Department of the Army)	$14,836,668	1.3%	Rank history: #12 in FY2022, #9 in FY2023, #10 in FY2024 and #26 in FY2025; up 9 since FY2020.
13	The Miller / Hull Partnership, LLP Top agencies DOS (Department of State)	$14,044,997	1.2%	Rank history: not on the FY2022–FY2025 lists; up 97 since FY2020.
14	Richard & Kennedy Architects, LLC Top agencies DOS (Department of State)	$12,050,122	1.1%	Rank history: #13 in FY2022 and not on the FY2023–FY2025 lists; up 408 since FY2020.
15	Smithgroup Companies, Inc. Through Smithgroup, Inc. Top agencies SSA (Social Security Administration) GSA (General Services Administration) DOI (Department of the Interior)	$12,021,280	1.1%	Rank history: #20 in FY2022, #18 in FY2023, #22 in FY2024 and not on the FY2025 list; up 8 since FY2020.
16	Merrick-Rs & H Joint Venture LLP Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency) Army (Department of the Army)	$10,706,937	0.9%	Rank history: #32 in FY2022, #7 in FY2023, #25 in FY2024 and #36 in FY2025; new, not ranked in FY2020.
17	Science Applications International Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army)	$10,566,188	0.9%	Rank history: not on the FY2022 list, #89 in FY2023 and not on the FY2024–FY2025 lists; up 136 since FY2020.
18	RLF and Sherlock Smith and Adams JV Top agencies Navy (Department of the Navy)	$9,738,333	0.9%	Rank history: #11 in FY2022, #75 in FY2023, #33 in FY2024 and #100 in FY2025; up 71 since FY2020.
19	KAL Architects, Inc. Top agencies USAF (Department of the Air Force)	$9,621,251	0.8%	Rank history: #66 in FY2022, not on the FY2023 list, #23 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
20	RBA Group the 2 awardees, including NV5 Geospatial, Inc. and NV5 Consultants, Inc. Top agencies Army (Department of the Army) DOS (Department of State) Smithsonian (Smithsonian Institution)	$9,485,054	0.8%	Rank history: #69 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; up 31 since FY2020.
21	Stantec Incorporated 10 awardees, including Stantec Consulting Services Inc. Top agencies Army (Department of the Army) DOI (Department of the Interior) GSA (General Services Administration)	$9,166,695	0.8%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; down 8 since FY2020.
22	Acuity - Pt&C, LLC Top agencies Army (Department of the Army)	$9,025,194	0.8%	Rank history: #14 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
23	The Johnson-Mcadams Firm, P.a. Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration) USAF (Department of the Air Force)	$8,270,053	0.7%	Rank history: #62 in FY2022, #26 in FY2023, #14 in FY2024 and #43 in FY2025; up 19 since FY2020.
24	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. and Leidos Engineering LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$7,479,958	0.7%	Rank history: not on the FY2022 list, #43 in FY2023, #42 in FY2024 and not on the FY2025 list; up 16 since FY2020.
25	Towill Holding Company Inc Through Towill, Inc. Top agencies Army (Department of the Army)	$7,132,099	0.6%	Rank history: #87 in FY2022, #88 in FY2023 and not on the FY2024–FY2025 lists; up 81 since FY2020.
26	Otie-Rs&H JV Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$6,990,458	0.6%	Rank history: #58 in FY2022 and not on the FY2023–FY2025 lists; down 9 since FY2020.
27	Ch2M Hill Clark Nexsen Energy Partners JV Top agencies Navy (Department of the Navy)	$6,951,025	0.6%	Rank history: not on the FY2022–FY2025 lists; up 188 since FY2020.
28	Atkins Nuclear Secured Holdings Corporation 3 awardees, including Atkins North America, Inc. and Atkinsrealis USA Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$6,513,346	0.6%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
29	M Arthur Gensler JR & Associates Inc. 3 awardees Top agencies DHS (Department of Homeland Security) GSA (General Services Administration) HHS (Department of Health and Human Services)	$6,424,705	0.6%	Rank history: #86 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; up 65 since FY2020.
30	Woolpert, Inc. 3 awardees, including Waller, Todd & Sadler, A Woolpert Company, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$6,384,371	0.6%	Rank history: #18 in FY2022, #69 in FY2023, #43 in FY2024 and #12 in FY2025; up 183 since FY2020.
31	Accura Rosser 8A JV LLC Top agencies NASA (National Aeronautics and Space Administration)	$6,341,478	0.6%	Rank history: #53 in FY2022, #42 in FY2023, #75 in FY2024 and #90 in FY2025; up 8 since FY2020.
32	Spur Design, LLC Top agencies VA (Department of Veterans Affairs)	$6,200,957	0.5%	Rank history: not on the FY2022–FY2025 lists; up 258 since FY2020.
33	Schmidt-Prime Group, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force) Army (Department of the Army)	$6,017,364	0.5%	Rank history: #23 in FY2022, #31 in FY2023, #18 in FY2024 and #22 in FY2025; down 11 since FY2020.
34	Dj&A, P.C. Top agencies DOI (Department of the Interior) DOT (Department of Transportation) USDA (Department of Agriculture)	$5,903,987	0.5%	Rank history: #82 in FY2022, #60 in FY2023, #72 in FY2024 and #57 in FY2025; up 52 since FY2020.
35	Jacobs / Ewingcole, A Joint Venture Top agencies Navy (Department of the Navy)	$5,567,951	0.5%	Rank history: #28 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 29 since FY2020.
36	Mcdonough Bolyard Peck, Inc. 2 awardees Top agencies DOS (Department of State) Smithsonian (Smithsonian Institution)	$5,527,772	0.5%	Rank history: not on the FY2022–FY2023 lists, #28 in FY2024 and #13 in FY2025; up 93 since FY2020.
37	Anderson Engineering of Minnesota, LLC Top agencies VA (Department of Veterans Affairs)	$5,309,155	0.5%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
38	Utility Works A Joint Venture Top agencies Navy (Department of the Navy)	$5,112,423	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
39	Louis Berger U.S. Inc. 8 awardees, including WSP USA Inc. and WSP USA Buildings Inc. Top agencies Navy (Department of the Navy) DOT (Department of Transportation) DHA (Defense Health Agency)	$5,108,716	0.4%	Rank history: #47 in FY2022 and not on the FY2023–FY2025 lists; down 24 since FY2020.
40	Jacobs and Architects Hawaii Joint Venture Top agencies Army (Department of the Army)	$5,054,185	0.4%	Rank history: #17 in FY2022, not on the FY2023–FY2024 lists and #92 in FY2025; up 19 since FY2020.
41	Chustz Surveying LLC Top agencies Army (Department of the Army)	$5,047,045	0.4%	Rank history: not on the FY2022 list, #63 in FY2023 and not on the FY2024–FY2025 lists; up 68 since FY2020.
42	Power Engineers Inc. Top agencies Navy (Department of the Navy)	$5,025,601	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	Anderson Hallas Architects, PC Top agencies DOI (Department of the Interior) AOUSC (Administrative Office of the U.S. Courts)	$4,961,640	0.4%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; up 37 since FY2020.
44	Raymond Pond Solutions 8A II JV LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$4,856,158	0.4%	Rank history: #99 in FY2022, not on the FY2023–FY2024 lists and #84 in FY2025; up 72 since FY2020.
45	Quinn Evans Architects Inc. Top agencies DOI (Department of the Interior) NLRB (National Labor Relations Board) AOUSC (Administrative Office of the U.S. Courts)	$4,758,643	0.4%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
46	CTA Inc. Top agencies GSA (General Services Administration) DECA (Defense Commissary Agency) DOI (Department of the Interior)	$4,687,582	0.4%	Rank history: not on the FY2022–FY2025 lists; up 39 since FY2020.
47	KZF Design Inc. Top agencies USAF (Department of the Air Force) DECA (Defense Commissary Agency) Army (Department of the Army)	$4,565,547	0.4%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; down 20 since FY2020.
48	Mn-Bmcd SE JV Top agencies Navy (Department of the Navy)	$4,556,487	0.4%	Rank history: #29 in FY2022, #71 in FY2023, #54 in FY2024 and #18 in FY2025; new, not ranked in FY2020.
49	Pond & Company 2 awardees Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Army (Department of the Army)	$4,532,215	0.4%	Rank history: #34 in FY2022, #25 in FY2023, #48 in FY2024 and #72 in FY2025; down 3 since FY2020.
50	Jacobs / Huitt-Zollars, A Joint Venture Top agencies Army (Department of the Army)	$4,408,935	0.4%	Rank history: not on the FY2022–FY2025 lists; up 13 since FY2020.
51	Tetra Tech-Stanley JV Top agencies Army (Department of the Army)	$4,401,118	0.4%	Rank history: not on the FY2022–FY2025 lists; up 56 since FY2020.
52	Sherlock, Smith & Adams-Clark Nexsen Joint Venture Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$4,388,364	0.4%	Rank history: not on the FY2022–FY2025 lists; up 30 since FY2020.
53	Moffatt & Nichol - Burns & Mcdonnell Hawaii Top agencies Navy (Department of the Navy)	$4,355,781	0.4%	Rank history: #52 in FY2022, not on the FY2023 list, #9 in FY2024 and #24 in FY2025; down 19 since FY2020.
54	Sustainable Engineering JV Top agencies USAF (Department of the Air Force)	$4,332,444	0.4%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
55	RMF Engineering, Inc., P.C. Top agencies DOS (Department of State)	$4,241,994	0.4%	Rank history: #100 in FY2022, not on the FY2023 list, #95 in FY2024 and not on the FY2025 list; up 58 since FY2020.
56	Thompson Engineering, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$4,176,656	0.4%	Rank history: #25 in FY2022, #48 in FY2023, #19 in FY2024 and #28 in FY2025; up 79 since FY2020.
57	Design Partners, Incorporated Top agencies Navy (Department of the Navy) Army (Department of the Army)	$4,114,931	0.4%	Rank history: #59 in FY2022, #19 in FY2023, #11 in FY2024 and #20 in FY2025; down 20 since FY2020.
58	Surdex Corporation Top agencies Army (Department of the Army)	$4,110,602	0.4%	Rank history: not on the FY2022–FY2023 lists, #58 in FY2024 and not on the FY2025 list; up 57 since FY2020.
59	Tutor Perini Corporation Through Perini Management Services, Inc. Top agencies DOS (Department of State)	$4,027,854	0.4%	Rank history: #61 in FY2022, #41 in FY2023, #21 in FY2024 and #96 in FY2025; up 107 since FY2020.
60	Makhpiya Project Management Co. WLL Top agencies Army (Department of the Army)	$3,988,991	0.3%	Rank history: #24 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; up 6 since FY2020.
61	Beta Testing & Inspection LLC Top agencies Army (Department of the Army)	$3,982,123	0.3%	Rank history: not on the FY2022–FY2025 lists; up 134 since FY2020.
62	DLR Holding Company Through DLR Group Inc. Top agencies GSA (General Services Administration) AOUSC (Administrative Office of the U.S. Courts) DHS (Department of Homeland Security)	$3,794,920	0.3%	Rank history: not on the FY2022–FY2025 lists; up 172 since FY2020.
63	Bullock Tice Associates, LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy) Army (Department of the Army)	$3,687,283	0.3%	Rank history: #72 in FY2022, #80 in FY2023 and not on the FY2024–FY2025 lists; up 20 since FY2020.
64	Vali Cooper International LLC Top agencies VA (Department of Veterans Affairs) Army (Department of the Army)	$3,649,172	0.3%	Rank history: not on the FY2022–FY2025 lists; up 41 since FY2020.
65	Yaeger Architecture Inc. Top agencies Army (Department of the Army)	$3,600,349	0.3%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
66	Kenneth Hahn Architects Inc. Top agencies DOI (Department of the Interior) USAF (Department of the Air Force) GSA (General Services Administration)	$3,592,657	0.3%	Rank history: #71 in FY2022 and not on the FY2023–FY2025 lists; up 116 since FY2020.
67	Moca Systems, Inc. 3 awardees Top agencies Army (Department of the Army) USAF (Department of the Air Force) OSD (Office of the Secretary of Defense)	$3,566,710	0.3%	Rank history: not on the FY2022–FY2025 lists; up 272 since FY2020.
68	Shop Architects, Inc. Top agencies DOS (Department of State)	$3,532,488	0.3%	Rank history: #60 in FY2022, #39 in FY2023, #85 in FY2024 and #87 in FY2025; up 80 since FY2020.
69	Baxter Hodell Donnelly Preston Inc. Top agencies GSA (General Services Administration) Commerce (Department of Commerce) HHS (Department of Health and Human Services)	$3,503,603	0.3%	Rank history: not on the FY2022–FY2024 lists and #40 in FY2025; up 147 since FY2020.
70	Cope Associates Inc. Top agencies USAF (Department of the Air Force)	$3,488,931	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Skidmore, Owings & Merrill LLP Top agencies VA (Department of Veterans Affairs) DOS (Department of State)	$3,424,969	0.3%	Rank history: #37 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; up 33 since FY2020.
72	Gcag / SCG JV LLC Top agencies USAF (Department of the Air Force)	$3,382,183	0.3%	Rank history: not on the FY2022–FY2025 lists; up 72 since FY2020.
73	Eijv LLP Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$3,369,112	0.3%	Rank history: #64 in FY2022 and not on the FY2023–FY2025 lists; up 399 since FY2020.
74	Croft and Associates, Inc. Top agencies DOI (Department of the Interior)	$3,329,450	0.3%	Rank history: not on the FY2022–FY2023 lists, #99 in FY2024 and #51 in FY2025; down 9 since FY2020.
75	Linfield, Hunter & Junius, Inc. Top agencies Army (Department of the Army)	$3,326,016	0.3%	Rank history: not on the FY2022–FY2025 lists; up 217 since FY2020.
76	Architects Pacific, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$3,313,018	0.3%	Rank history: #90 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; up 22 since FY2020.
77	Wiley Wilson Burns & Mcdonnell Joint Venture Top agencies Navy (Department of the Navy) USUHS (DOD Uniformed Services University of the Health Sciences)	$3,047,498	0.3%	Rank history: #49 in FY2022, #93 in FY2023, #17 in FY2024 and #80 in FY2025; up 85 since FY2020.
78	Hb&A - the Schreifer Group Joint Venture Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$3,034,063	0.3%	Rank history: #68 in FY2022 and not on the FY2023–FY2025 lists; up 22 since FY2020.
79	AJC Architects, P.C. Top agencies DOI (Department of the Interior)	$2,996,824	0.3%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; up 251 since FY2020.
80	Stantec Tetra TECH JV II Top agencies Army (Department of the Army)	$2,977,106	0.3%	Rank history: not on the FY2022–FY2025 lists; up 226 since FY2020.
81	The Schemmer Associates Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) VA (Department of Veterans Affairs)	$2,952,289	0.3%	Rank history: not on the FY2022–FY2025 lists; up 112 since FY2020.
82	Stell Environmental Enterprises Inc. Top agencies Army (Department of the Army)	$2,932,208	0.3%	Rank history: #33 in FY2022, #67 in FY2023, #53 in FY2024 and not on the FY2025 list; down 20 since FY2020.
83	Premier Stanley JV LLC Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$2,829,755	0.2%	Rank history: #92 in FY2022 and not on the FY2023–FY2025 lists; up 210 since FY2020.
84	Robert Peccia & Associates, Inc. Top agencies DOT (Department of Transportation) USDA (Department of Agriculture)	$2,763,594	0.2%	Rank history: not on the FY2022–FY2025 lists; up 102 since FY2020.
85	Katerra Inc. Through Lord, Aeck & Sargent, Inc. Top agencies DOI (Department of the Interior)	$2,745,863	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Merrick & Company Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$2,678,828	0.2%	Rank history: not on the FY2022–FY2023 lists, #57 in FY2024 and not on the FY2025 list; down 33 since FY2020.
87	BCE Engineers Inc. Top agencies Army (Department of the Army)	$2,675,825	0.2%	Rank history: not on the FY2022–FY2025 lists; down 49 since FY2020.
88	Strv JV II LLC Top agencies USAF (Department of the Air Force)	$2,626,777	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Rs&H, Inc. Top agencies DECA (Defense Commissary Agency)	$2,556,329	0.2%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; up 107 since FY2020.
90	Symmes Maini & Mckee Associates Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$2,501,591	0.2%	Rank history: #98 in FY2022, #92 in FY2023 and not on the FY2024–FY2025 lists; up 99 since FY2020.
91	Liberty JV Top agencies USAF (Department of the Air Force)	$2,474,073	0.2%	Rank history: not on the FY2022–FY2025 lists; up 166 since FY2020.
92	Burgess & Niple, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$2,465,864	0.2%	Rank history: not on the FY2022–FY2025 lists; up 211 since FY2020.
93	Management Solutions Inc. Top agencies USAF (Department of the Air Force)	$2,443,171	0.2%	Rank history: not on the FY2022–FY2025 lists; up 101 since FY2020.
94	Donovan-Hill Group, Inc. Through Baskerville Donovan Inc. Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command) NGA (Department of Defense National Geospatial Intelligence Agency)	$2,426,797	0.2%	Rank history: #78 in FY2022, #97 in FY2023 and not on the FY2024–FY2025 lists; down 26 since FY2020.
95	Natives of Kodiak, Incorporated 2 awardees, including Trinity Analysis and Development Corp. and Trinity / Jacobs JV, LLC Top agencies Army (Department of the Army)	$2,398,446	0.2%	Rank history: not on the FY2022–FY2025 lists; up 85 since FY2020.
96	Blair Remy Corp PC Top agencies USAF (Department of the Air Force)	$2,355,078	0.2%	Rank history: not on the FY2022–FY2025 lists; down 24 since FY2020.
97	Design Alaska, Inc. Top agencies DOI (Department of the Interior) Army (Department of the Army) DHS (Department of Homeland Security)	$2,348,565	0.2%	Rank history: not on the FY2022–FY2025 lists; up 155 since FY2020.
98	Genterra-Freese and Nichols Small Business Mentor-Protege Joint Venture Top agencies Army (Department of the Army)	$2,334,350	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
99	Lbyd Federal, LLC Top agencies DOI (Department of the Interior)	$2,297,770	0.2%	Rank history: not on the FY2022–FY2025 lists; up 66 since FY2020.
100	Infrastructure Engineering Solutions Top agencies USAF (Department of the Air Force)	$2,290,221	0.2%	Rank history: not on the FY2022–FY2025 lists; down 4 since FY2020.

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100 of 670 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 $1.14 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 C211 contractors in FY2021?

1. AECOM ($84.3M), 2. Hdr, Inc. ($79.9M), 3. Jacobs Engineering Group Inc. ($38.1M), 4. Burns & Mcdonnell, Inc. ($33.5M), 5. Tetra Tech, Inc. ($32.5M), 6. Michael Baker International, LLC ($22.2M), 7. SC Companies, Inc. ($19.8M), 8. Parsons Corporation ($19M), 9. Jacobs Government Services Company ($15.4M), 10. Baker Jacobs JV ($15.4M).

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