Top 100 Contractors in PSC R605: Library Services, FY2021

Name: Top 100 Contractors in PSC R605: Library Services, FY2021
Creator: GovTribe

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

The top 10 won 58% of FY2021 PSC R605 contract dollars

Contract obligations: $92,959,130 Net of deobligations, by contracts coded PSC R605
Contractors: 127 Parent companies with an obligation
Largest contractor: Asrc Federal Professional Services, LLC $13 million, 13.7% 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	Asrc Federal Professional Services, LLC Top agencies Commerce (Department of Commerce)	$12,952,389	13.7%	Rank history: #1 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
2	Wolters Kluwer N.V. 3 awardees, including Uptodate, Inc., Wolters Kluwer Clinical Drug Information, Inc. and CCH Incorporated Top agencies VA (Department of Veterans Affairs) CFTC (Commodity Futures Trading Commission) HHS (Department of Health and Human Services)	$8,165,756	8.7%	Rank history: #4 in FY2022, #8 in FY2023 and not on the FY2024–FY2025 lists; up 1 since FY2020.
3	Prenax Inc. Top agencies VA (Department of Veterans Affairs) Navy (Department of the Navy)	$6,594,944	7.0%	Rank history: #3 in FY2022, #3 in FY2023, #6 in FY2024 and #5 in FY2025; down 1 since FY2020.
4	Clarivate Analytics (US) LLC Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$5,678,417	6.0%	Rank history: #6 in FY2022, #6 in FY2023, #7 in FY2024 and #9 in FY2025; up 63 since FY2020.
5	Ebsco Industries Inc. 3 awardees Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs) DHA (Defense Health Agency)	$4,618,994	4.9%	Rank history: #5 in FY2022, #5 in FY2023, #4 in FY2024 and #19 in FY2025; up 24 since FY2020.
6	Applied Enterprise Management Corporation Top agencies ED (Department of Education)	$4,102,746	4.4%	Rank history: #7 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
7	Taft Broadcasting Company, L.L.C. Top agencies DMA (Defense Media Activity)	$3,303,877	3.5%	Rank history: #8 in FY2022, #9 in FY2023, #9 in FY2024 and #16 in FY2025; up 1 since FY2020.
8	Reed Elsevier Inc. 3 awardees, including Elsevier B.V., Elsevier Inc. and Relx Inc. Top agencies Commerce (Department of Commerce) VA (Department of Veterans Affairs) OSC (US Office of Special Counsel)	$3,287,766	3.5%	Rank history: #10 in FY2022 and not on the FY2023–FY2025 lists; up 28 since FY2020.
9	Cox Subscriptions, Inc. Top agencies VA (Department of Veterans Affairs) DOT (Department of Transportation)	$3,045,995	3.2%	Rank history: #2 in FY2022, #2 in FY2023, #1 in FY2024 and #1 in FY2025; unchanged since FY2020.
10	Kelly & Dewitt Inc. Top agencies HHS (Department of Health and Human Services)	$2,956,519	3.1%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
11	Information Ventures Inc. Top agencies HHS (Department of Health and Human Services)	$2,582,662	2.7%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
12	University of North Carolina at Chapel Hill Top agencies EPA (Environmental Protection Agency)	$2,179,256	2.3%	Rank history: #11 in FY2022, #12 in FY2023, #11 in FY2024 and #11 in FY2025; new, not ranked in FY2020.
13	Library Associates, Inc. Through Library Associates of Maryland, LLC Top agencies USDA (Department of Agriculture) NSF (National Science Foundation) HHS (Department of Health and Human Services)	$2,051,660	2.2%	Rank history: #15 in FY2022, #22 in FY2023, #38 in FY2024 and not on the FY2025 list; up 2 since FY2020.
14	Dynamic Business Group, Inc. Top agencies HHS (Department of Health and Human Services)	$1,994,279	2.1%	Rank history: #12 in FY2022, #15 in FY2023, #37 in FY2024 and #15 in FY2025; unchanged since FY2020.
15	Cygnus Corp Inc. Top agencies HHS (Department of Health and Human Services)	$1,967,851	2.1%	Rank history: #52 in FY2022, #53 in FY2023, #43 in FY2024 and #41 in FY2025; up 3 since FY2020.
16	Logical Images, Inc. Top agencies VA (Department of Veterans Affairs)	$1,866,311	2.0%	Rank history: #13 in FY2022, #18 in FY2023, #14 in FY2024 and #13 in FY2025; down 6 since FY2020.
17	Cadence Group Associates, Inc. Top agencies DOJ (Department of Justice) Army (Department of the Army) FMSHRC (Federal Mine Safety and Health Review Commission)	$1,658,226	1.8%	Rank history: #19 in FY2022, #17 in FY2023, #12 in FY2024 and #10 in FY2025; unchanged since FY2020.
18	Select Federal Services, LLC Top agencies NASA (National Aeronautics and Space Administration)	$1,581,750	1.7%	Rank history: #16 in FY2022, #19 in FY2023 and not on the FY2024–FY2025 lists; down 5 since FY2020.
19	Zimmerman Associates, Inc. Top agencies HHS (Department of Health and Human Services) FCC (Federal Communications Commission)	$1,170,542	1.2%	Rank history: #21 in FY2022, #27 in FY2023, #17 in FY2024 and #30 in FY2025; unchanged since FY2020.
20	American Medical Association Top agencies VA (Department of Veterans Affairs)	$1,131,442	1.2%	Rank history: #22 in FY2022, #24 in FY2023, #18 in FY2024 and not on the FY2025 list; up 3 since FY2020.
21	University of Southern California Top agencies DMA (Defense Media Activity)	$1,060,424	1.1%	Rank history: #26 in FY2022, #30 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
22	Blackfish Federal, LLC Top agencies HHS (Department of Health and Human Services)	$1,059,225	1.1%	Rank history: #9 in FY2022 and not on the FY2023–FY2025 lists; down 16 since FY2020.
23	Hedgelan Consulting LLC Top agencies USDA (Department of Agriculture) DOI (Department of the Interior)	$1,018,653	1.1%	Rank history: #24 in FY2022, #23 in FY2023, #27 in FY2024 and #22 in FY2025; up 1 since FY2020.
24	Mcgraw Hill LLC Top agencies VA (Department of Veterans Affairs)	$875,714	0.9%	Rank history: not on the FY2022 list, #28 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
25	Trinity-Nextstep LLC Top agencies Navy (Department of the Navy)	$862,160	0.9%	Rank history: not on the FY2022 list, #32 in FY2023, #24 in FY2024 and #23 in FY2025; new, not ranked in FY2020.
26	Fearless Solutions, LLC Top agencies DHS (Department of Homeland Security)	$802,740	0.9%	Rank history: #25 in FY2022, #29 in FY2023, #21 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
27	Weris, Inc. Top agencies DOT (Department of Transportation)	$770,697	0.8%	Rank history: #28 in FY2022, #33 in FY2023, #26 in FY2024 and #25 in FY2025; up 3 since FY2020.
28	Action Staffing Solutions, Inc. Top agencies DOI (Department of the Interior) DOJ (Department of Justice)	$721,628	0.8%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; up 34 since FY2020.
29	Cat-Ensoftek Top agencies EPA (Environmental Protection Agency)	$702,703	0.7%	Rank history: not on the FY2022–FY2025 lists; down 9 since FY2020.
30	Totally Joined for Achieving Collaborative Techniques (Tjfact), LLC Top agencies EPA (Environmental Protection Agency)	$692,757	0.7%	Rank history: #31 in FY2022, #42 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
31	Amentum Services, Inc. Top agencies DOJ (Department of Justice)	$643,141	0.7%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
32	Oclc, Inc. Top agencies Commerce (Department of Commerce) HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$619,844	0.7%	Rank history: #33 in FY2022, #34 in FY2023, #25 in FY2024 and #27 in FY2025; down 6 since FY2020.
33	MPF Federal, LLC Top agencies Commerce (Department of Commerce)	$561,251	0.6%	Rank history: #36 in FY2022, #37 in FY2023, #30 in FY2024 and #44 in FY2025; down 1 since FY2020.
34	Riva Solutions Inc. Top agencies USAF (Department of the Air Force)	$554,375	0.6%	Rank history: #38 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
35	Calique Management Solutions, Incorporated Top agencies DHS (Department of Homeland Security)	$539,359	0.6%	Rank history: #37 in FY2022, #38 in FY2023, #32 in FY2024 and not on the FY2025 list; down 2 since FY2020.
36	Telesolv Consulting Inc. Top agencies EPA (Environmental Protection Agency)	$536,051	0.6%	Rank history: #23 in FY2022, #25 in FY2023, #22 in FY2024 and #35 in FY2025; new, not ranked in FY2020.
37	Cambridge Information Group Inc. 3 awardees, including Ex Libris USA Inc., Proquest LLC and Innovative Interfaces Incorporated Top agencies VA (Department of Veterans Affairs) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$531,564	0.6%	Rank history: #63 in FY2022, #45 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.
38	American Psychiatric Association Top agencies VA (Department of Veterans Affairs)	$504,068	0.5%	Rank history: #20 in FY2022, #26 in FY2023, #20 in FY2024 and #21 in FY2025; down 3 since FY2020.
39	Rieles Group LLC Top agencies USAF (Department of the Air Force)	$478,028	0.5%	Rank history: #40 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
40	A Book Company, LLC Top agencies DOI (Department of the Interior)	$460,000	0.5%	Rank history: #53 in FY2022, #87 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
41	Vista Technology Services Inc. Top agencies HHS (Department of Health and Human Services)	$405,485	0.4%	Rank history: #35 in FY2022, #36 in FY2023, #36 in FY2024 and not on the FY2025 list; up 7 since FY2020.
42	Barnallen Technologies, Inc. Top agencies Treasury (Department of the Treasury) EPA (Environmental Protection Agency)	$381,836	0.4%	Rank history: #44 in FY2022, #44 in FY2023, #61 in FY2024 and not on the FY2025 list; down 17 since FY2020.
43	Seba Professional Services LLC Top agencies HHS (Department of Health and Human Services)	$379,024	0.4%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
44	Highlight Technologies, LLC Top agencies DHS (Department of Homeland Security)	$351,644	0.4%	Rank history: not on the FY2022–FY2025 lists; down 5 since FY2020.
45	Thomson Reuters (Tax & Accounting) Inc. 2 awardees, including West Publishing Corporation Top agencies Treasury (Department of the Treasury) DOI (Department of the Interior) OSD (Office of the Secretary of Defense)	$313,707	0.3%	Rank history: #42 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
46	Cherokee Nation Through Cherokee Federal Solutions, L.L.C. Top agencies DHA (Defense Health Agency)	$302,175	0.3%	Rank history: #46 in FY2022, #46 in FY2023 and not on the FY2024–FY2025 lists; down 8 since FY2020.
47	360 Innovative Solutions LLC Top agencies SEC (Securities and Exchange Commission)	$291,756	0.3%	Rank history: #47 in FY2022, #39 in FY2023, #35 in FY2024 and #33 in FY2025; new, not ranked in FY2020.
48	Sinclair Broadcast Group Inc. Through Politico, LLC Top agencies DOE (Department of Energy)	$237,425	0.3%	Rank history: #74 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
49	Third Iron LLC Top agencies VA (Department of Veterans Affairs)	$210,000	0.2%	Rank history: #48 in FY2022, #49 in FY2023, #40 in FY2024 and #45 in FY2025; new, not ranked in FY2020.
50	Bloomberg LP 2 awardees, including Bloomberg Finance LP and Bloomberg Industry Group, Inc. Top agencies GAO (Government Accountability Office) Treasury (Department of the Treasury)	$190,364	0.2%	Rank history: #56 in FY2022, #35 in FY2023, #85 in FY2024 and #79 in FY2025; unchanged since FY2020.
51	LM Information Delivery Inc. Top agencies SEC (Securities and Exchange Commission)	$185,011	0.2%	Rank history: #60 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
52	Sirsi Corporation Top agencies USAF (Department of the Air Force) DOI (Department of the Interior) DOT (Department of Transportation)	$180,980	0.2%	Rank history: #61 in FY2022, #67 in FY2023, #54 in FY2024 and #74 in FY2025; down 7 since FY2020.
53	Staywell Company LLC the Top agencies VA (Department of Veterans Affairs)	$168,531	0.2%	Rank history: #58 in FY2022, #60 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
54	Archscan, LLC Top agencies VA (Department of Veterans Affairs)	$162,568	0.2%	Rank history: #80 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; up 24 since FY2020.
55	Martin Loyd Inc. Top agencies HHS (Department of Health and Human Services)	$153,947	0.2%	Rank history: #32 in FY2022, #40 in FY2023, #31 in FY2024 and #34 in FY2025; new, not ranked in FY2020.
56	Oneida Technical Solutions, LLC Top agencies Army (Department of the Army)	$138,078	0.1%	Rank history: #64 in FY2022, #64 in FY2023, #53 in FY2024 and #48 in FY2025; down 4 since FY2020.
57	Iron Mountain Incorporated 2 awardees, including Iron Mountain Information Management LLC Top agencies HHS (Department of Health and Human Services)	$131,833	0.1%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; down 4 since FY2020.
58	Antimicrobial Therapy, Inc. Top agencies VA (Department of Veterans Affairs)	$118,369	0.1%	Rank history: #65 in FY2022, #70 in FY2023, #57 in FY2024 and #54 in FY2025; new, not ranked in FY2020.
59	Therapeutic Research Center, LLC Top agencies HHS (Department of Health and Human Services)	$115,920	0.1%	Rank history: #66 in FY2022, #69 in FY2023, #56 in FY2024 and not on the FY2025 list; down 1 since FY2020.
60	Bowhead Business and Technology Solutions, LLC Top agencies Army (Department of the Army)	$110,259	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Concord Professional Services, Inc. Top agencies VA (Department of Veterans Affairs)	$109,114	0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
62	History Associates Incorporated Top agencies HHS (Department of Health and Human Services)	$107,696	0.1%	Rank history: not on the FY2022–FY2024 lists and #65 in FY2025; new, not ranked in FY2020.
63	South Dakota Board of Regents Through The University of South Dakota Top agencies VA (Department of Veterans Affairs)	$101,015	0.1%	Rank history: #69 in FY2022, #76 in FY2023, #64 in FY2024 and not on the FY2025 list; down 3 since FY2020.
64	Oil Price Information Service LLC Through IHS Global Inc. Top agencies Navy (Department of the Navy)	$95,849	0.1%	Rank history: #87 in FY2022, #58 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
65	Digital Science & Research Solutions Inc. 2 awardees, including Springer Nature Customer Service Center LLC and Springer Nature America, Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security) USAF (Department of the Air Force)	$94,938	0.1%	Rank history: #17 in FY2022, #21 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
66	Midtown Personnel Inc. Top agencies USDA (Department of Agriculture)	$85,133	0.1%	Rank history: #72 in FY2022, #82 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
67	Association for Professionals In Infection Control & Epidemiology Inc. Top agencies VA (Department of Veterans Affairs)	$82,775	0.1%	Rank history: #73 in FY2022, #81 in FY2023, #72 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
68	Argus Media Inc. Top agencies CFTC (Commodity Futures Trading Commission)	$80,595	0.1%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
69	Comaxsys, LLC Top agencies VA (Department of Veterans Affairs)	$79,201	0.1%	Rank history: #71 in FY2022, #77 in FY2023, #66 in FY2024 and #57 in FY2025; up 1 since FY2020.
70	Ghul, Zaki Top agencies Smithsonian (Smithsonian Institution)	$77,397	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Hyertek Inc. Top agencies CSB (Chemical Safety and Hazard Investigation Board)	$75,900	0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
72	Derycz Scientific Inc. Through Reprints Desk, Inc. Top agencies EPA (Environmental Protection Agency)	$75,000	0.1%	Rank history: #54 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; down 16 since FY2020.
73	Access Intelligence LLC Top agencies DOE (Department of Energy)	$68,927	0.1%	Rank history: #76 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
74	Tax Analysts Top agencies GAO (Government Accountability Office)	$68,380	0.1%	Rank history: #77 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; down 3 since FY2020.
75	Environment & Energy Publishing, LLC Top agencies GAO (Government Accountability Office)	$64,965	0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
76	Progressive Technology Federal Systems Inc. Top agencies DOL (Department of Labor)	$61,757	0.1%	Rank history: not on the FY2022–FY2025 lists; down 45 since FY2020.
77	Libraryworld Inc. Top agencies VA (Department of Veterans Affairs)	$57,420	0.1%	Rank history: #81 in FY2022 and not on the FY2023–FY2025 lists; down 3 since FY2020.
78	Canadian Science Publishing (Csp) Top agencies USDA (Department of Agriculture)	$55,496	0.1%	Rank history: #82 in FY2022, #88 in FY2023, #78 in FY2024 and #70 in FY2025; down 2 since FY2020.
79	Rachael Kirschenmann Top agencies Smithsonian (Smithsonian Institution)	$48,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	GMG Management Consulting Inc. Top agencies HHS (Department of Health and Human Services)	$47,300	0.1%	Rank history: #84 in FY2022, #93 in FY2023, #84 in FY2024 and #78 in FY2025; down 1 since FY2020.
81	Eavenson Library Consulting LLC Top agencies Commerce (Department of Commerce)	$46,864	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 16 since FY2020.
82	DUN & Bradstreet Inc. Top agencies CPSC (Consumer Product Safety Commission)	$45,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Quantech Inc. Top agencies HUD (Department of Housing and Urban Development)	$43,262	<0.1%	Rank history: #85 in FY2022, #94 in FY2023, #83 in FY2024 and #76 in FY2025; new, not ranked in FY2020.
84	Euromoney Institutional Investor PLC Through Euromoney Trading Limited Top agencies EXIM (Export Import Bank of the US)	$40,745	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
85	Wright State University Top agencies VA (Department of Veterans Affairs)	$37,136	<0.1%	Rank history: #91 in FY2022, #99 in FY2023, #87 in FY2024 and not on the FY2025 list; up 3 since FY2020.
86	Navsim Services, Inc. Top agencies DHS (Department of Homeland Security)	$35,810	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
87	Leadership Connect, Inc. Top agencies EOP (Executive Office of the President) EXIM (Export Import Bank of the US)	$32,360	<0.1%	Rank history: #68 in FY2022, #66 in FY2023, #55 in FY2024 and #52 in FY2025; up 3 since FY2020.
88	Premier Solutions Hi LLC Top agencies Navy (Department of the Navy)	$31,992	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
89	Prairie Quest, Inc. Top agencies Navy (Department of the Navy) DOI (Department of the Interior)	$29,855	<0.1%	Rank history: #55 in FY2022, #61 in FY2023, #51 in FY2024 and #47 in FY2025; down 43 since FY2020.
90	Indiana Center for Nursing, Inc. Top agencies VA (Department of Veterans Affairs)	$29,250	<0.1%	Rank history: #97 in FY2022, not on the FY2023 list, #95 in FY2024 and not on the FY2025 list; up 1 since FY2020.
91	Medical Library Association Inc. Top agencies VA (Department of Veterans Affairs)	$29,016	<0.1%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; up 2 since FY2020.
92	Association of Operating Room Nurses, Inc. Top agencies VA (Department of Veterans Affairs)	$29,007	<0.1%	Rank history: #88 in FY2022, #95 in FY2023, #75 in FY2024 and #64 in FY2025; up 2 since FY2020.
93	William S. Hein & Co., Inc. Top agencies Treasury (Department of the Treasury)	$28,415	<0.1%	Rank history: #96 in FY2022, not on the FY2023 list, #80 in FY2024 and #66 in FY2025; down 18 since FY2020.
94	Brodart Co 2 awardees Top agencies USAF (Department of the Air Force) DOT (Department of Transportation)	$27,231	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
95	Wake Forest University Health Sciences Top agencies VA (Department of Veterans Affairs)	$25,680	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	The Institute of Electrical and Electronics Engineers Incorp Through Institute of Electrical & Electronics Engineers Inc. Top agencies GAO (Government Accountability Office) DOT (Department of Transportation)	$24,346	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 9 since FY2020.
97	Royal Society of Chemistry (The) Top agencies NASA (National Aeronautics and Space Administration)	$23,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	American National Standards Institute Incorporated Top agencies VA (Department of Veterans Affairs)	$21,980	<0.1%	Rank history: not on the FY2022 list, #56 in FY2023, #46 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
99	Walker, Vincent Top agencies USAF (Department of the Air Force)	$21,943	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
100	Factiva Inc. Top agencies Treasury (Department of the Treasury)	$21,926	<0.1%	Rank history: not on the FY2022 list, #96 in FY2023 and not on the FY2024–FY2025 lists; up 3 since FY2020.

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100 of 127 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 $94.3 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 PSC R605 contractors in FY2021?

1. Asrc Federal Professional Services, LLC ($13M), 2. Wolters Kluwer N.V. ($8.17M), 3. Prenax Inc. ($6.59M), 4. Clarivate Analytics (US) LLC ($5.68M), 5. Ebsco Industries Inc. ($4.62M), 6. Applied Enterprise Management Corporation ($4.1M), 7. Taft Broadcasting Company, L.L.C. ($3.3M), 8. Reed Elsevier Inc. ($3.29M), 9. Cox Subscriptions, Inc. ($3.05M), 10. Kelly & Dewitt Inc. ($2.96M).

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