Top 100 Contractors in PSC B504: Chemical/Biological Studies and Analysis, FY2021

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	PAE Government Services Inc. Through PAE National Security Solutions LLC Top agencies Army (Department of the Army)	$4,427,205	12.4%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
2	Southwest Research Institute 2 awardees, including Signature Science LLC Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services) CSB (Chemical Safety and Hazard Investigation Board)	$4,159,254	11.6%	Rank history: #8 in FY2022, #7 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
3	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency)	$3,220,410	9.0%	Rank history: #4 in FY2022, #3 in FY2023, #13 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
4	Techlaw, Inc. Through Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$3,097,275	8.7%	Rank history: #3 in FY2022, #5 in FY2023, #16 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
5	Serco North America (Holdings) Inc Through Serco Inc. Top agencies EPA (Environmental Protection Agency)	$2,060,604	5.8%	Rank history: #7 in FY2022, #16 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
6	RTI Laboratories Inc. Top agencies DOI (Department of the Interior)	$1,599,980	4.5%	Rank history: #9 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
7	Cincinnati Univ Of Top agencies CPSC (Consumer Product Safety Commission)	$1,124,020	3.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; up 7 since FY2020.
8	Somalogic Operating Co., Inc. Top agencies HHS (Department of Health and Human Services)	$1,098,000	3.1%	Rank history: not on the FY2022–FY2025 lists; up 19 since FY2020.
9	Aqua Survey, Inc. Top agencies Army (Department of the Army)	$959,104	2.7%	Rank history: #10 in FY2022, not on the FY2023 list, #77 in FY2024 and not on the FY2025 list; up 1 since FY2020.
10	Quest Diagnostics Incorporated Top agencies VA (Department of Veterans Affairs)	$873,611	2.4%	Rank history: #44 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
11	Advanced Environmental Management Group, LLC Top agencies Army (Department of the Army)	$868,346	2.4%	Rank history: #19 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
12	Natives of Kodiak, Incorporated Through Environmental Assessment Services, LLC Top agencies Army (Department of the Army)	$702,843	2.0%	Rank history: #12 in FY2022, #17 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
13	ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency)	$631,843	1.8%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
14	Alchem Laboratories Corporation Top agencies HHS (Department of Health and Human Services)	$611,057	1.7%	Rank history: #20 in FY2022, not on the FY2023 list, #30 in FY2024 and not on the FY2025 list; up 1 since FY2020.
15	Battelle Memorial Institute Top agencies DHS (Department of Homeland Security)	$488,668	1.4%	Rank history: not on the FY2022 list, #26 in FY2023, #33 in FY2024 and #13 in FY2025; new, not ranked in FY2020.
16	Tetra Tech, Inc. Top agencies Army (Department of the Army)	$393,531	1.1%	Rank history: #13 in FY2022, #20 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
17	Serco Inc. Top agencies EPA (Environmental Protection Agency)	$389,544	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
18	Compagnie Merieux Alliance Through Silliker, Inc. Top agencies HHS (Department of Health and Human Services)	$385,000	1.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	Tdi-Brooks International Inc. Top agencies DOI (Department of the Interior)	$373,477	1.0%	Rank history: not on the FY2022–FY2025 lists; down 12 since FY2020.
20	Electro- Analytical, Inc. Top agencies GSA (General Services Administration)	$342,770	1.0%	Rank history: #26 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
21	Azenta, Inc. Through Genewiz, LLC Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$287,357	0.8%	Rank history: #38 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; up 76 since FY2020.
22	University of Pittsburgh - of the Commonwealth System of Higher Education Top agencies HHS (Department of Health and Human Services)	$253,236	0.7%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; up 24 since FY2020.
23	Burleson Research Technologies, Inc. Top agencies EPA (Environmental Protection Agency)	$247,600	0.7%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
24	Metabolon, Inc. Top agencies HHS (Department of Health and Human Services) DOI (Department of the Interior)	$240,240	0.7%	Rank history: #49 in FY2022, #35 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	Anthrotech Inc. Top agencies HHS (Department of Health and Human Services)	$186,901	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	The Texas A&M University System 2 awardees, including Texas A&M Agrilife Research and Texas A & M University Top agencies DOI (Department of the Interior)	$185,394	0.5%	Rank history: #32 in FY2022, #51 in FY2023, #41 in FY2024 and not on the FY2025 list; down 8 since FY2020.
27	National University of Singapore Top agencies HHS (Department of Health and Human Services)	$169,830	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Auxilio Management Services Top agencies USDA (Department of Agriculture)	$153,710	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
29	Ihrc, Incorporated Top agencies HHS (Department of Health and Human Services)	$152,714	0.4%	Rank history: #33 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
30	Irisys, Inc. Through Societal Cdmo San Diego, LLC Top agencies HHS (Department of Health and Human Services)	$150,754	0.4%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; down 24 since FY2020.
31	A B C a M PLC Through Abcam Inc. Top agencies EPA (Environmental Protection Agency)	$141,192	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
32	Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$137,026	0.4%	Rank history: #14 in FY2022, not on the FY2023 list, #5 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
33	Reaction Biology Corporation Top agencies HHS (Department of Health and Human Services)	$125,600	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Pennington & Associates, Inc. Top agencies Army (Department of the Army)	$124,750	0.3%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
35	Copperhead Environmental Consulting Inc. Top agencies USDA (Department of Agriculture)	$120,783	0.3%	Rank history: #45 in FY2022, not on the FY2023 list, #88 in FY2024 and not on the FY2025 list; up 10 since FY2020.
36	Idexx Laboratories Inc. Through Idexx Distribution, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$109,200	0.3%	Rank history: #36 in FY2022, #50 in FY2023, #48 in FY2024 and #25 in FY2025; new, not ranked in FY2020.
37	Acgt Inc. Top agencies HHS (Department of Health and Human Services)	$93,400	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	QPS LLC Top agencies HHS (Department of Health and Human Services)	$91,900	0.3%	Rank history: not on the FY2022–FY2024 lists and #56 in FY2025; new, not ranked in FY2020.
39	South Carolina State of Through The Medical University of South Carolina Top agencies HHS (Department of Health and Human Services)	$88,200	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
40	Charles River Laboratories International Inc. Through Charles River Laboratories, Inc. Top agencies HHS (Department of Health and Human Services)	$79,359	0.2%	Rank history: #66 in FY2022, #69 in FY2023, #71 in FY2024 and #28 in FY2025; up 7 since FY2020.
41	Macrogen, Inc. Through Psomagen Inc. Top agencies HHS (Department of Health and Human Services)	$78,028	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	Inalab Consulting, Inc. Top agencies DOI (Department of the Interior)	$76,741	0.2%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
43	Poochon Scientific LLC Top agencies HHS (Department of Health and Human Services)	$64,799	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
44	The Administrators of Tulane Educational Fund Top agencies VA (Department of Veterans Affairs)	$60,560	0.2%	Rank history: not on the FY2022–FY2025 lists; up 27 since FY2020.
45	Servi Tech, Inc. Top agencies USDA (Department of Agriculture)	$60,356	0.2%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; up 43 since FY2020.
46	Mriglobal Top agencies HHS (Department of Health and Human Services)	$59,709	0.2%	Rank history: #5 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
47	Dairyland Laboratories, Inc. Top agencies USDA (Department of Agriculture)	$55,988	0.2%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
48	Qiagen N.V. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services)	$53,883	0.2%	Rank history: not on the FY2022–FY2023 lists, #80 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
49	Erin Lyons Top agencies DOI (Department of the Interior)	$53,356	0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
50	Voelschow, Julie Top agencies DOI (Department of the Interior)	$51,811	0.1%	Rank history: not on the FY2022–FY2025 lists; up 12 since FY2020.
51	Idexx Distribution, Inc. Top agencies HHS (Department of Health and Human Services)	$50,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 22 since FY2020.
52	University of Washington Top agencies Smithsonian (Smithsonian Institution)	$50,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	University of South Carolina Top agencies EPA (Environmental Protection Agency)	$43,980	0.1%	Rank history: not on the FY2022 list, #76 in FY2023 and not on the FY2024–FY2025 lists; down 15 since FY2020.
54	Blue Skies Professional Services LLC Top agencies Army (Department of the Army)	$41,700	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
55	Laboratory Corporation of America Holdings Through Envigo Bioproducts Inc. Top agencies HHS (Department of Health and Human Services)	$40,780	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Immunosolutions Inc. Top agencies Army (Department of the Army)	$39,086	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Bailess, Alexander L Top agencies DOI (Department of the Interior)	$36,170	0.1%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
58	Western Kentucky University Top agencies DOI (Department of the Interior)	$35,800	0.1%	Rank history: not on the FY2022 list, #72 in FY2023, #58 in FY2024 and #50 in FY2025; new, not ranked in FY2020.
59	Biospyder Technologies, Inc. Top agencies EPA (Environmental Protection Agency)	$32,802	0.1%	Rank history: not on the FY2022–FY2024 lists and #61 in FY2025; up 11 since FY2020.
60	Genscript USA Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$32,069	0.1%	Rank history: #76 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; up 18 since FY2020.
61	Buck, Evan Top agencies DOI (Department of the Interior)	$32,042	0.1%	Rank history: not on the FY2022–FY2025 lists; up 68 since FY2020.
62	HK3 Lab S.R.L. Top agencies HHS (Department of Health and Human Services)	$31,000	0.1%	Rank history: #58 in FY2022, #80 in FY2023, #73 in FY2024 and #54 in FY2025; up 17 since FY2020.
63	Environmental Science Corporation Top agencies Army (Department of the Army)	$30,025	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
64	College of Health Sciences, University of Ghana Top agencies HHS (Department of Health and Human Services)	$30,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	RJ Lee Group Inc. Top agencies EPA (Environmental Protection Agency)	$30,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Wuxi Apptec (HONGKONG) Limited Top agencies HHS (Department of Health and Human Services)	$28,400	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Phycotech, Inc. Top agencies DOI (Department of the Interior)	$26,403	0.1%	Rank history: #48 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
68	Apconix Ltd Top agencies HHS (Department of Health and Human Services)	$26,085	0.1%	Rank history: #62 in FY2022, #90 in FY2023, #79 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
69	The Boeing Company Top agencies Navy (Department of the Navy)	$25,701	0.1%	Rank history: #24 in FY2022, #40 in FY2023 and not on the FY2024–FY2025 lists; down 48 since FY2020.
70	VRL Maryland LLC Top agencies HHS (Department of Health and Human Services)	$25,000	0.1%	Rank history: #67 in FY2022, #74 in FY2023, not on the FY2024 list and #37 in FY2025; new, not ranked in FY2020.
71	Lead Consulting and Service L.L.C. Top agencies HHS (Department of Health and Human Services)	$24,995	0.1%	Rank history: #68 in FY2022, #89 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
72	University of Tennessee Top agencies HHS (Department of Health and Human Services)	$24,919	0.1%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
73	Diversity Arrays Technology PTY Limited Top agencies DOI (Department of the Interior)	$24,900	0.1%	Rank history: not on the FY2022 list, #49 in FY2023, not on the FY2024 list and #55 in FY2025; new, not ranked in FY2020.
74	Standard Biotools Inc. Top agencies HHS (Department of Health and Human Services)	$24,882	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Absorption Systems LP Through Pharmaron (San Diego) Lab Services LLC Top agencies HHS (Department of Health and Human Services)	$24,806	0.1%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
76	University of Montana System Through Montana State University Top agencies HHS (Department of Health and Human Services)	$24,470	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Pazmino, Marco Top agencies DOI (Department of the Interior)	$24,242	0.1%	Rank history: not on the FY2022–FY2025 lists; up 44 since FY2020.
78	Sekisui America Corporation Through Xenotech LLC Top agencies HHS (Department of Health and Human Services)	$24,163	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
79	Natalie Collar Top agencies DOI (Department of the Interior)	$23,475	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Avance Biosciences Inc. Top agencies HHS (Department of Health and Human Services)	$23,050	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Wallace, Morgan Top agencies DOI (Department of the Interior)	$22,412	0.1%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
82	Plunkett Amanda Top agencies DOI (Department of the Interior)	$21,166	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	The Corp of Church of Christ Latter-Day ST Through Brigham Young University Top agencies DOI (Department of the Interior)	$20,809	0.1%	Rank history: not on the FY2022–FY2025 lists; up 40 since FY2020.
84	Adams, Alexandra C Top agencies DOI (Department of the Interior)	$20,373	0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
85	MS Bioworks LLC Top agencies HHS (Department of Health and Human Services)	$20,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Qualis, LLC Top agencies Army (Department of the Army)	$18,391	0.1%	Rank history: #6 in FY2022, #6 in FY2023, #4 in FY2024 and #8 in FY2025; new, not ranked in FY2020.
87	Lewis, Teri Top agencies DOI (Department of the Interior)	$18,334	0.1%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
88	Eurofins Scientific Through Eurofins Product Safety Labs Inc. Top agencies USDA (Department of Agriculture)	$18,305	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Duke University Top agencies DOI (Department of the Interior)	$18,300	0.1%	Rank history: #27 in FY2022, #71 in FY2023, #69 in FY2024 and not on the FY2025 list; up 41 since FY2020.
90	Twinstrand Biosciences Inc. Top agencies HHS (Department of Health and Human Services)	$18,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Novogene Corporation Inc Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$17,481	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Nolan, Alexander J Top agencies DOI (Department of the Interior)	$16,924	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
93	Thapa, Ajij Top agencies DOI (Department of the Interior)	$16,359	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
94	Campbell Brothers Limited 2 awardees, including Als Group Usa, Corp. Top agencies DOI (Department of the Interior)	$15,167	<0.1%	Rank history: #29 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; down 37 since FY2020.
95	Emory University Top agencies HHS (Department of Health and Human Services)	$15,066	<0.1%	Rank history: not on the FY2022–FY2023 lists, #53 in FY2024 and #19 in FY2025; new, not ranked in FY2020.
96	Northwestern Memorial Healthcare Through Illinois Proton Center, LLC Top agencies NASA (National Aeronautics and Space Administration)	$14,850	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Eurofins Clinical Testing US Holdings, LLC Top agencies USDA (Department of Agriculture)	$14,820	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	University of Oregon Top agencies DOI (Department of the Interior)	$14,103	<0.1%	Rank history: #55 in FY2022, #95 in FY2023 and not on the FY2024–FY2025 lists; up 7 since FY2020.
99	Merck KG AUF Aktien Through Bioreliance Corporation Top agencies HHS (Department of Health and Human Services)	$13,720	<0.1%	Rank history: #57 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
100	Zymo Research Corporation Top agencies VA (Department of Veterans Affairs)	$13,455	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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 $35.7 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.

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