Top 81 Contractors in PSC B504: Chemical/Biological Studies and Analysis, FY2025

Name: Top 81 Contractors in PSC B504: Chemical/Biological Studies and Analysis, FY2025
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2024 – Sep 30, 2025 Code page on GovTribe

The top 10 won 83% of FY2025 PSC B504 contract dollars

Contract obligations: $59,789,484 Net of deobligations, by contracts coded PSC B504
Contractors: 86 Parent companies with an obligation
Largest contractor: Merrick & Company $26.8 million, 41.5% of obligations
Data as of: Oct 14, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 81 rows as CSV

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Merrick & Company Top agencies USDA (Department of Agriculture) DHS (Department of Homeland Security)	$26,796,592	41.5%	Rank history: not on the FY2021–FY2023 lists and #6 in FY2024; up 5 since FY2024.
2	MRIGLOBAL Top agencies DOD (Department of Defense)	$5,268,831	8.2%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2023 and #3 in FY2024; up 1 since FY2024.
3	Semanticbits LLC Through ICF Incorporated, L.L.C. Top agencies EPA (Environmental Protection Agency) CPSC (Consumer Product Safety Commission)	$4,942,374	7.7%	Rank history: not on the FY2021–FY2023 lists and #2 in FY2024; down 1 since FY2024.
4	Techlaw Consultants Inc. Top agencies EPA (Environmental Protection Agency)	$4,198,914	6.5%	Rank history: #32 in FY2021, #14 in FY2022, not on the FY2023 list and #5 in FY2024; up 1 since FY2024.
5	Signature Science, LLC Top agencies DHS (Department of Homeland Security)	$3,219,077	5.0%	Rank history: not on the FY2021–FY2023 lists and #7 in FY2024; up 2 since FY2024.
6	Bryce Space and Technology, LLC Top agencies Army (Department of the Army)	$2,863,915	4.4%	Rank history: not on the FY2021 list, #17 in FY2022, #10 in FY2023 and #11 in FY2024; up 5 since FY2024.
7	Serco Inc Top agencies EPA (Environmental Protection Agency)	$2,733,304	4.2%	Rank history: not on the FY2021–FY2022 lists, #9 in FY2023 and #8 in FY2024; up 1 since FY2024.
8	Qualis, LLC Top agencies Army (Department of the Army)	$2,147,607	3.3%	Rank history: #86 in FY2021, #6 in FY2022, #6 in FY2023 and #4 in FY2024; down 4 since FY2024.
9	Aptargroup Inc. Top agencies HHS (Department of Health and Human Services)	$650,036	1.0%	Rank history: not on the FY2021–FY2023 lists and #17 in FY2024; up 8 since FY2024.
10	Environmental Assessment Services, LLC Top agencies Army (Department of the Army)	$602,511	0.9%	Rank history: not on the FY2021–FY2023 lists and #21 in FY2024; up 11 since FY2024.
11	Regents of the University of Michigan Top agencies HHS (Department of Health and Human Services)	$531,568	0.8%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2023 and #23 in FY2024; up 12 since FY2024.
12	Lakota-Sundance JV, LLC Top agencies DOI (Department of the Interior)	$471,787	0.7%	Rank history: not on the FY2021–FY2024 lists; new.
13	Battelle Memorial Institute Top agencies HHS (Department of Health and Human Services)	$468,168	0.7%	Rank history: #15 in FY2021, not on the FY2022 list, #26 in FY2023 and #33 in FY2024; up 20 since FY2024.
14	Eurofins Lancaster Laboratories Environment Testing, LLC Top agencies Army (Department of the Army)	$460,776	0.7%	Rank history: not on the FY2021–FY2023 lists and #24 in FY2024; up 10 since FY2024.
15	Cyprotex US LLC Top agencies EPA (Environmental Protection Agency)	$451,650	0.7%	Rank history: not on the FY2021–FY2024 lists; new.
16	University of Connecticut Top agencies HHS (Department of Health and Human Services)	$446,375	0.7%	Rank history: not on the FY2021–FY2023 lists and #25 in FY2024; up 9 since FY2024.
17	Jeol Usa, Inc. Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$353,167	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
18	University of California, LOS Angeles Top agencies HHS (Department of Health and Human Services)	$331,388	0.5%	Rank history: not on the FY2021–FY2024 lists; new.
19	Emory University Top agencies HHS (Department of Health and Human Services)	$249,824	0.4%	Rank history: #95 in FY2021, not on the FY2022–FY2023 lists and #53 in FY2024; up 34 since FY2024.
20	Christie Bryant Inc Through Bryant Christie Inc. Top agencies USDA (Department of Agriculture)	$235,432	0.4%	Rank history: not on the FY2021–FY2023 lists and #28 in FY2024; up 8 since FY2024.
21	Eurofins Environment Testing Northeast, LLC Top agencies Army (Department of the Army)	$229,023	0.4%	Rank history: not on the FY2021–FY2022 lists, #37 in FY2023 and #31 in FY2024; up 10 since FY2024.
22	The Marine Biological Laboratory Top agencies Smithsonian (Smithsonian Institution)	$198,700	0.3%	Rank history: not on the FY2021–FY2022 lists, #43 in FY2023 and #37 in FY2024; up 15 since FY2024.
23	BSA Environmental Services Inc. Top agencies DOI (Department of the Interior)	$171,929	0.3%	Rank history: not on the FY2021–FY2023 lists and #22 in FY2024; down 1 since FY2024.
24	SGS Axys Analytical Services Ltd. Top agencies DOI (Department of the Interior)	$142,429	0.2%	Rank history: not on the FY2021–FY2024 lists; new.
25	Idexx Laboratories Inc. Through Idexx Distribution, Inc. Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$128,710	0.2%	Rank history: #36 in FY2021, #36 in FY2022, #50 in FY2023 and #48 in FY2024; up 23 since FY2024.
26	Azenta US Inc. Top agencies VA (Department of Veterans Affairs)	$106,450	0.2%	Rank history: not on the FY2021–FY2023 lists and #42 in FY2024; up 16 since FY2024.
27	Chemogenics Biopharma, LLC Top agencies HHS (Department of Health and Human Services)	$101,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2023 and #32 in FY2024; up 5 since FY2024.
28	Charles River Laboratories International Inc. Through Charles River Laboratories, Inc. Top agencies HHS (Department of Health and Human Services)	$99,888	0.2%	Rank history: #40 in FY2021, #66 in FY2022, #69 in FY2023 and #71 in FY2024; up 43 since FY2024.
29	In Silichrom Ltd Top agencies HHS (Department of Health and Human Services)	$95,421	0.1%	Rank history: not on the FY2021–FY2023 lists and #51 in FY2024; up 22 since FY2024.
30	Siemens Industry Inc. Top agencies HHS (Department of Health and Human Services)	$91,040	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
31	Leticia Diaz Top agencies DOI (Department of the Interior)	$73,890	0.1%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023 and #63 in FY2024; up 32 since FY2024.
32	Eurofins EAG Materials Science LLC Top agencies USDA (Department of Agriculture)	$68,640	0.1%	Rank history: not on the FY2021–FY2023 lists and #91 in FY2024; up 59 since FY2024.
33	Bethel Engineering & Consulting LLC Top agencies DOI (Department of the Interior)	$64,017	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
34	Neogen Corp Top agencies USDA (Department of Agriculture)	$59,911	0.1%	Rank history: not on the FY2021 list, #42 in FY2022, #59 in FY2023 and #45 in FY2024; up 11 since FY2024.
35	Halekoa LLC Top agencies Smithsonian (Smithsonian Institution)	$55,812	0.1%	Rank history: not on the FY2021 list, #34 in FY2022 and not on the FY2023–FY2024 lists; returned.
36	Activation Laboratories Ltd Top agencies DOI (Department of the Interior)	$54,726	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
37	VRL Maryland LLC Top agencies HHS (Department of Health and Human Services)	$50,057	0.1%	Rank history: #70 in FY2021, #67 in FY2022, #74 in FY2023 and not on the FY2024 list; returned.
38	The Regents of the University of California, San Diego Top agencies VA (Department of Veterans Affairs)	$49,817	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
39	The Smithers Group Inc Through Smithers Ers LLC Top agencies USDA (Department of Agriculture)	$47,505	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
40	Degraff Business Consulting LLC Top agencies USDA (Department of Agriculture)	$46,033	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
41	University of Massachusetts Top agencies Commerce (Department of Commerce)	$45,000	0.1%	Rank history: not on the FY2021–FY2023 lists and #72 in FY2024; up 31 since FY2024.
42	Gtseek LLC Top agencies DOI (Department of the Interior)	$43,792	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
43	Seqmatic, LLC Top agencies USDA (Department of Agriculture)	$42,630	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
44	Shannon & Wilson Inc. Top agencies Army (Department of the Army)	$41,107	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
45	Johns Hopkins University Top agencies HHS (Department of Health and Human Services)	$39,996	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
46	Auburn University Top agencies Smithsonian (Smithsonian Institution)	$38,147	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
47	Universite Laval Top agencies DOI (Department of the Interior)	$37,462	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
48	Trustees of Dartmouth College Top agencies VA (Department of Veterans Affairs)	$37,426	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
49	Eurofins Environment Testing Southeast, LLC Top agencies USAF (Department of the Air Force)	$37,207	0.1%	Rank history: not on the FY2021–FY2024 lists; new.
50	Western Kentucky University Top agencies DOI (Department of the Interior)	$35,000	0.1%	Rank history: #58 in FY2021, not on the FY2022 list, #72 in FY2023 and #58 in FY2024; up 8 since FY2024.
51	DR Reed & Associates, Inc. Top agencies Army (Department of the Army)	$34,574	0.1%	Rank history: not on the FY2021–FY2022 lists, #14 in FY2023 and #61 in FY2024; up 10 since FY2024.
52	I-2-I Solutions, Inc. Top agencies DOI (Department of the Interior)	$34,452	0.1%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2023 and not on the FY2024 list; returned.
53	Bend Genetics LLC Top agencies DOI (Department of the Interior)	$32,950	0.1%	Rank history: not on the FY2021 list, #77 in FY2022, #88 in FY2023 and #87 in FY2024; up 34 since FY2024.
54	HK3 Lab S.R.L. Top agencies HHS (Department of Health and Human Services)	$31,000	<0.1%	Rank history: #62 in FY2021, #58 in FY2022, #80 in FY2023 and #73 in FY2024; up 19 since FY2024.
55	Diversity Arrays Technology PTY Limited Top agencies DOI (Department of the Interior)	$27,950	<0.1%	Rank history: #73 in FY2021, not on the FY2022 list, #49 in FY2023 and not on the FY2024 list; returned.
56	QPS LLC Top agencies HHS (Department of Health and Human Services)	$25,900	<0.1%	Rank history: #38 in FY2021 and not on the FY2022–FY2024 lists; returned.
57	Christopher J KIM Top agencies Smithsonian (Smithsonian Institution)	$25,000	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
58	University of New Mexico Top agencies USDA (Department of Agriculture)	$24,932	<0.1%	Rank history: not on the FY2021–FY2023 lists and #86 in FY2024; up 28 since FY2024.
59	Eurofins Environment Testing Northern California LLC Top agencies DOI (Department of the Interior)	$24,820	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 53 since FY2024.
60	Gram Consulting Services GCS Inc. Top agencies HHS (Department of Health and Human Services)	$24,500	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
61	Biospyder Technologies, Inc. Top agencies EPA (Environmental Protection Agency)	$24,250	<0.1%	Rank history: #59 in FY2021 and not on the FY2022–FY2024 lists; returned.
62	Mary Behlke Top agencies Smithsonian (Smithsonian Institution)	$23,952	<0.1%	Rank history: not on the FY2021 list, #18 in FY2022 and not on the FY2023–FY2024 lists; returned.
63	Chemtrack Alaska, Inc. Top agencies DOI (Department of the Interior)	$22,631	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
64	Novogene Corporation Inc Top agencies Commerce (Department of Commerce)	$20,000	<0.1%	Rank history: not on the FY2021–FY2023 lists and #78 in FY2024; up 14 since FY2024.
65	Florida Institute of Technology Inc. Top agencies Navy (Department of the Navy)	$17,013	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
66	Cumberland Valley Analytical Services, Inc. Top agencies USDA (Department of Agriculture)	$16,125	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
67	William Alexander Top agencies DOI (Department of the Interior)	$12,550	<0.1%	Rank history: not on the FY2021–FY2023 lists and #97 in FY2024; up 30 since FY2024.
68	Texas A & M University System Through Texas A&M Agrilife Research Top agencies DOI (Department of the Interior)	$10,488	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
69	American Association for Laboratory Accreditation, Inc. Top agencies DOD (Department of Defense)	$9,725	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022 and not on the FY2023–FY2024 lists; up 52 since FY2024.
70	Brigham Young University Top agencies DOI (Department of the Interior)	$8,452	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
71	Physis Environmental Laboratories, Inc. Top agencies DOI (Department of the Interior)	$8,148	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
72	Samantha Lei Top agencies DOI (Department of the Interior)	$6,972	<0.1%	Rank history: not on the FY2021–FY2023 lists and #99 in FY2024; up 27 since FY2024.
73	University of Maryland Center for Environmental Science Top agencies DOI (Department of the Interior)	$6,109	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 45 since FY2024.
74	Pace Analytical Services LLC 2 awardees, including Alpha Analytical, Inc. Top agencies DOI (Department of the Interior)	$6,048	<0.1%	Rank history: not on the FY2021–FY2023 lists and #96 in FY2024; up 22 since FY2024.
75	Penrose Environmental, LLC Top agencies USDA (Department of Agriculture)	$5,600	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
76	Eileen M Hemphill-Haley Top agencies DOI (Department of the Interior)	$5,250	<0.1%	Rank history: not on the FY2021–FY2024 lists; up 34 since FY2024.
77	Cornell University Top agencies USDA (Department of Agriculture)	$5,000	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
78	SGS North America Inc. Top agencies DOI (Department of the Interior)	$2,500	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
79	Technical Safety Services, LLC Top agencies Navy (Department of the Navy)	$2,430	<0.1%	Rank history: not on the FY2021 list, #96 in FY2022 and not on the FY2023–FY2024 lists; up 38 since FY2024.
80	Landauer, Inc. Top agencies Navy (Department of the Navy)	$2,280	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.
81	Eliza Jane Ross Top agencies DOI (Department of the Interior)	$2,073	<0.1%	Rank history: not on the FY2021–FY2024 lists; new.

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81 of 86 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 $64.6 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 2025 ran Oct 1, 2024 – Sep 30, 2025. 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 FY2024. "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 FY2024 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 B504 contractors in FY2025?

1. Merrick & Company ($26.8M), 2. MRIGLOBAL ($5.27M), 3. Semanticbits LLC ($4.94M), 4. Techlaw Consultants Inc. ($4.2M), 5. Signature Science, LLC ($3.22M), 6. Bryce Space and Technology, LLC ($2.86M), 7. Serco Inc ($2.73M), 8. Qualis, LLC ($2.15M), 9. Aptargroup Inc. ($650K), 10. Environmental Assessment Services, LLC ($603K).

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