Top 100 Contractors in PSC J052: Maintenance, Repair and Rebuilding of Equipment: Measuring Tool, FY2021

Name: Top 100 Contractors in PSC J052: Maintenance, Repair and Rebuilding of Equipment: Measuring Tool, FY2021
Creator: GovTribe

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

The top 10 won 90% of FY2021 PSC J052 contract dollars

Contract obligations: $48,022,755 Net of deobligations, by contracts coded PSC J052
Contractors: 124 Parent companies with an obligation
Largest contractor: Calista Corp $15 million, 30.7% 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	Calista Corp 2 awardees, including Yulista Support Services LLC and Y-Tech Services, Inc. Top agencies USAF (Department of the Air Force)	$15,035,804	30.7%	Rank history: #1 in FY2022, #2 in FY2023, #6 in FY2024 and not on the FY2025 list; up 1 since FY2020.
2	Apro International, Inc. Top agencies USAF (Department of the Air Force)	$13,195,389	26.9%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; down 1 since FY2020.
3	Goldbelt, Incorporated Through Goldbelt C6, LLC Top agencies USAF (Department of the Air Force)	$6,624,083	13.5%	Rank history: #3 in FY2022, #3 in FY2023, #3 in FY2024 and not on the FY2025 list; unchanged since FY2020.
4	Mesotech International, Inc. Top agencies USAF (Department of the Air Force)	$2,372,404	4.8%	Rank history: #4 in FY2022, #5 in FY2023, #4 in FY2024 and #3 in FY2025; unchanged since FY2020.
5	Kbr, Inc. Through KBR Wyle Services, LLC Top agencies USAF (Department of the Air Force)	$2,008,848	4.1%	Rank history: #6 in FY2022, #8 in FY2023, #8 in FY2024 and not on the FY2025 list; up 2 since FY2020.
6	Science and Management Resources, Inc. Top agencies USAF (Department of the Air Force)	$1,781,586	3.6%	Rank history: #5 in FY2022, #6 in FY2023, #64 in FY2024 and #6 in FY2025; unchanged since FY2020.
7	Haight Bey & Associates LLC Top agencies USAF (Department of the Air Force)	$1,378,782	2.8%	Rank history: #7 in FY2022, #7 in FY2023, #5 in FY2024 and #5 in FY2025; new, not ranked in FY2020.
8	Teradyne Inc. Top agencies USAF (Department of the Air Force)	$668,555	1.4%	Rank history: #11 in FY2022, #10 in FY2023, #11 in FY2024 and #11 in FY2025; new, not ranked in FY2020.
9	R & D Scientific Corp Top agencies DHA (Defense Health Agency) Army (Department of the Army)	$479,238	1.0%	Rank history: #13 in FY2022, #21 in FY2023, #14 in FY2024 and #42 in FY2025; up 1 since FY2020.
10	The Aleut Corporation Through Aleut Remediation LLC Top agencies DLA (Defense Logistics Agency)	$385,925	0.8%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
11	ACR Technical Services Inc. Top agencies Navy (Department of the Navy)	$378,728	0.8%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
12	Electronic Risks Consultants, Inc. Top agencies Army (Department of the Army)	$193,440	0.4%	Rank history: not on the FY2022–FY2023 lists, #27 in FY2024 and #28 in FY2025; new, not ranked in FY2020.
13	Polimaster Inc. Top agencies DHS (Department of Homeland Security)	$180,625	0.4%	Rank history: #16 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
14	S&G Trading, Limited Liability Company Top agencies Army (Department of the Army)	$173,700	0.4%	Rank history: #24 in FY2022, #28 in FY2023, #20 in FY2024 and #37 in FY2025; new, not ranked in FY2020.
15	Blade Diagnostics Corporation Top agencies USAF (Department of the Air Force)	$172,787	0.4%	Rank history: #9 in FY2022, #15 in FY2023, #13 in FY2024 and #13 in FY2025; up 2 since FY2020.
16	Park Engineering Services Inc. Top agencies Army (Department of the Army)	$155,820	0.3%	Rank history: #21 in FY2022, #24 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
17	Danaher Corporation 3 awardees, including Sea-Bird Electronics, Inc., Western Environmental Technology Laboratories, Inc. and Beckman Coulter, Inc. Top agencies Navy (Department of the Navy)	$125,672	0.3%	Rank history: #30 in FY2022, #77 in FY2023, #22 in FY2024 and #25 in FY2025; up 9 since FY2020.
18	Waters Corporation Through Waters Technologies Corporation Top agencies HHS (Department of Health and Human Services)	$111,679	0.2%	Rank history: #12 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
19	API Technologies Corp Through Spectrum Microwave, Inc. Top agencies USAF (Department of the Air Force)	$110,700	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
20	Prime One Contracting LLC Top agencies EPA (Environmental Protection Agency)	$107,368	0.2%	Rank history: #29 in FY2022, #30 in FY2023, #45 in FY2024 and #33 in FY2025; up 24 since FY2020.
21	Eniwetok Group, LLC Top agencies Army (Department of the Army)	$104,445	0.2%	Rank history: #23 in FY2022, #35 in FY2023, #30 in FY2024 and #30 in FY2025; down 2 since FY2020.
22	Bruker Corporation 3 awardees, including Bruker AXS Inc. and Bruker Nano, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$95,227	0.2%	Rank history: #44 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; up 13 since FY2020.
23	Intergraph Corporation 2 awardees, including Hexagon Manufacturing Intelligence, LLC and Leica Geosystems Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$92,090	0.2%	Rank history: #10 in FY2022, #17 in FY2023, #69 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
24	Advanced Testing Technologies Inc. Top agencies USAF (Department of the Air Force)	$90,000	0.2%	Rank history: #18 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
25	Q.E.D. Environmental Systems Limited Top agencies Navy (Department of the Navy)	$87,840	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
26	Oxford Instruments PLC Through Oxford Instruments America, Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$85,064	0.2%	Rank history: #37 in FY2022, #68 in FY2023 and not on the FY2024–FY2025 lists; up 23 since FY2020.
27	The Churchill Companies Through TSI Incorporated Top agencies DHS (Department of Homeland Security)	$75,560	0.2%	Rank history: #20 in FY2022, #75 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
28	Process Insights GMBH Top agencies USAF (Department of the Air Force)	$62,714	0.1%	Rank history: #31 in FY2022, #37 in FY2023, #38 in FY2024 and #36 in FY2025; up 5 since FY2020.
29	Rotronic Instrument Corp. Through Process Sensing Technologies Corp. Top agencies VA (Department of Veterans Affairs)	$60,204	0.1%	Rank history: #56 in FY2022, #56 in FY2023, #62 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
30	AVL Test Systems Inc. Top agencies DOT (Department of Transportation)	$59,702	0.1%	Rank history: #35 in FY2022, #41 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
31	Modtech Solutions LLC Top agencies Army (Department of the Army)	$59,645	0.1%	Rank history: #34 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
32	Southern Industrial Scales, LLC Top agencies Army (Department of the Army)	$56,420	0.1%	Rank history: #42 in FY2022, #57 in FY2023, #44 in FY2024 and #45 in FY2025; down 1 since FY2020.
33	Saab AB Through Saab Inc. Top agencies DOT (Department of Transportation)	$54,557	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Thermo Electron Corporation 3 awardees, including Thermo Electron North America LLC, FEI Company and Thermo Eberline LLC Top agencies DOT (Department of Transportation) Navy (Department of the Navy) DLA (Defense Logistics Agency)	$53,021	0.1%	Rank history: #43 in FY2022, #100 in FY2023 and not on the FY2024–FY2025 lists; up 9 since FY2020.
35	Technology for Energy Corp Top agencies USAF (Department of the Air Force)	$52,986	0.1%	Rank history: #38 in FY2022, #36 in FY2023, #39 in FY2024 and #39 in FY2025; up 4 since FY2020.
36	Inmar Clearing Inc. 2 awardees, including Trescal, Inc. Top agencies Army (Department of the Army)	$48,376	0.1%	Rank history: #26 in FY2022, #39 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
37	Saab Inc. Top agencies DOT (Department of Transportation)	$48,099	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	Faro Technologies Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$46,650	0.1%	Rank history: #47 in FY2022, #18 in FY2023, #19 in FY2024 and #27 in FY2025; down 29 since FY2020.
39	Phillips Scales, LLC Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$45,207	0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
40	Keysight Technologies, Inc. 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$45,062	0.1%	Rank history: #46 in FY2022, #13 in FY2023, #15 in FY2024 and #18 in FY2025; down 13 since FY2020.
41	Horiba Ltd. Through Horiba Instruments Incorporated Top agencies VA (Department of Veterans Affairs)	$39,415	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
42	North Atlantic Industries, Inc. Top agencies Navy (Department of the Navy)	$38,831	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
43	3D Systems Corporation Top agencies Army (Department of the Army)	$36,900	0.1%	Rank history: #53 in FY2022 and not on the FY2023–FY2025 lists; down 11 since FY2020.
44	Crystal Instruments Corporation Top agencies Navy (Department of the Navy)	$32,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
45	Coastal Inspection Services,Incorporated Top agencies VA (Department of Veterans Affairs)	$31,880	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
46	Integrated Development & Manufacturing Company Top agencies Navy (Department of the Navy)	$31,766	0.1%	Rank history: not on the FY2022–FY2025 lists; up 2 since FY2020.
47	R. S. Means Company LLC 2 awardees, including Tektronix, Inc. and Fluke Electronics Corp Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$30,348	0.1%	Rank history: #85 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
48	MTS Systems Corporation Top agencies Army (Department of the Army)	$29,863	0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
49	Carl Zeiss X-RAY Microscopy Inc. Through Carl Zeiss Industrial Metrology, LLC Top agencies Navy (Department of the Navy)	$29,500	0.1%	Rank history: #19 in FY2022, #12 in FY2023, #34 in FY2024 and #34 in FY2025; up 25 since FY2020.
50	Ametek Inc. 3 awardees, including Edax, LLC, Spectro Analytical Instruments, Inc. and Spectro Scientific, Inc. Top agencies DOJ (Department of Justice) Navy (Department of the Navy) DHS (Department of Homeland Security)	$27,425	0.1%	Rank history: #66 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
51	Agilent Technologies, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$26,768	0.1%	Rank history: #65 in FY2022, #51 in FY2023 and not on the FY2024–FY2025 lists; up 58 since FY2020.
52	Scantron Corporation Through Secur-Serv Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency)	$24,808	0.1%	Rank history: not on the FY2022–FY2025 lists; down 10 since FY2020.
53	Sustainment Technologies, LLC Top agencies HHS (Department of Health and Human Services) VA (Department of Veterans Affairs)	$24,595	0.1%	Rank history: #67 in FY2022, #76 in FY2023, #82 in FY2024 and not on the FY2025 list; unchanged since FY2020.
54	Brandywine Communications Top agencies Navy (Department of the Navy)	$24,570	0.1%	Rank history: not on the FY2022 list, #93 in FY2023 and not on the FY2024–FY2025 lists; up 41 since FY2020.
55	Mirion Technologies (CANBERRA) Inc. Top agencies NASA (National Aeronautics and Space Administration)	$23,350	<0.1%	Rank history: #79 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
56	Cross Technologies, Inc. Top agencies DLA (Defense Logistics Agency)	$22,860	<0.1%	Rank history: not on the FY2022–FY2023 lists, #63 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
57	OHD LLLP Top agencies Navy (Department of the Navy)	$22,500	<0.1%	Rank history: #69 in FY2022, #73 in FY2023, #79 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
58	USA Scales, Inc. Top agencies USAF (Department of the Air Force)	$22,153	<0.1%	Rank history: #58 in FY2022, #79 in FY2023 and not on the FY2024–FY2025 lists; down 11 since FY2020.
59	Automated Precision, Inc. Top agencies Navy (Department of the Navy)	$21,440	<0.1%	Rank history: #70 in FY2022, #74 in FY2023, #75 in FY2024 and #75 in FY2025; up 30 since FY2020.
60	GSL Solutions Inc. Top agencies DHA (Defense Health Agency)	$20,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
61	Viacoustics, Inc. Top agencies Army (Department of the Army)	$19,750	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
62	Polytec Gesellschaft FUR Analysen- MES- & Regel-Technik MBH Through Polytec, Inc. Top agencies Navy (Department of the Navy)	$19,600	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	EOI Inc. Top agencies VA (Department of Veterans Affairs)	$19,380	<0.1%	Rank history: #73 in FY2022 and not on the FY2023–FY2025 lists; up 1 since FY2020.
64	Illinois Tool Works Inc. Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$19,101	<0.1%	Rank history: #60 in FY2022, #90 in FY2023, #77 in FY2024 and #44 in FY2025; up 49 since FY2020.
65	Droplet Measurement Technologies, LLC Top agencies DOT (Department of Transportation)	$18,891	<0.1%	Rank history: not on the FY2022 list, #64 in FY2023, #78 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
66	Value Tool & Engineering Inc. Top agencies Navy (Department of the Navy)	$18,632	<0.1%	Rank history: #91 in FY2022, not on the FY2023 list, #60 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
67	Pratt & Whitney Measurement Systems, Inc. Top agencies Navy (Department of the Navy)	$18,601	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Prosensing Inc. Top agencies USAF (Department of the Air Force)	$18,000	<0.1%	Rank history: #75 in FY2022, #88 in FY2023, #91 in FY2024 and #69 in FY2025; up 1 since FY2020.
69	Ideal Aerosmith Inc. Top agencies USAF (Department of the Air Force)	$16,946	<0.1%	Rank history: #93 in FY2022 and not on the FY2023–FY2025 lists; up 10 since FY2020.
70	Campbell Scientific Inc. Top agencies Army (Department of the Army)	$16,401	<0.1%	Rank history: #80 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
71	Rue's Weighfill Service LLC Top agencies Navy (Department of the Navy)	$16,330	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	JDS Uniphase Corporation Through Viavi Solutionsllc Top agencies Navy (Department of the Navy)	$16,140	<0.1%	Rank history: not on the FY2022 list, #49 in FY2023 and not on the FY2024–FY2025 lists; up 26 since FY2020.
73	Laurus Systems Inc. Top agencies Army (Department of the Army)	$15,960	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Rigaku Americas Holding Inc Top agencies Army (Department of the Army)	$15,527	<0.1%	Rank history: not on the FY2022 list, #92 in FY2023 and not on the FY2024–FY2025 lists; down 7 since FY2020.
75	Oerlikon Metco (US) Inc. Top agencies Navy (Department of the Navy)	$14,400	<0.1%	Rank history: #89 in FY2022, #96 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
76	Usmilcom, Inc. Top agencies Navy (Department of the Navy)	$14,168	<0.1%	Rank history: #64 in FY2022, #72 in FY2023, #72 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
77	Rixan Automation LLC Top agencies Army (Department of the Army)	$14,000	<0.1%	Rank history: #87 in FY2022, #95 in FY2023, #95 in FY2024 and #89 in FY2025; down 11 since FY2020.
78	Engineering & Manufacturing Services, Inc. Top agencies Navy (Department of the Navy)	$13,950	<0.1%	Rank history: not on the FY2022 list, #91 in FY2023, #93 in FY2024 and #87 in FY2025; down 7 since FY2020.
79	Business International W.L.L. Top agencies Navy (Department of the Navy)	$12,472	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
80	Birclar Electric & Electronics LLC Top agencies EPA (Environmental Protection Agency)	$12,360	<0.1%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
81	A.G. Service S.R.L. Top agencies Navy (Department of the Navy)	$12,141	<0.1%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
82	Xylem Inc. Through YSI Inc. Top agencies DOI (Department of the Interior)	$11,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
83	Vaisala OYJ Through Vaisala Inc. Top agencies DOT (Department of Transportation)	$11,109	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Cenmed Enterprises Inc. Top agencies Army (Department of the Army)	$10,800	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
85	Tidewater Scale Sales & Service Inc. Top agencies Army (Department of the Army)	$10,395	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 1 since FY2020.
86	LK Metrology Incorporated Top agencies Navy (Department of the Navy)	$10,193	<0.1%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
87	Waygate Technologies USA LP Top agencies Navy (Department of the Navy)	$9,991	<0.1%	Rank history: #82 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; down 46 since FY2020.
88	Inri Inc. Top agencies Army (Department of the Army)	$9,950	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
89	Chemring Energetic Devices Inc. Top agencies USAF (Department of the Air Force)	$9,882	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Standard Calibrations Inc. Top agencies Navy (Department of the Navy)	$9,430	<0.1%	Rank history: #72 in FY2022, #97 in FY2023, #21 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
91	Widgeon Enterprises, Inc. Top agencies USAF (Department of the Air Force)	$9,419	<0.1%	Rank history: #96 in FY2022, #71 in FY2023, #83 in FY2024 and #73 in FY2025; down 30 since FY2020.
92	The Maclean Group LLC Top agencies Army (Department of the Army)	$9,136	<0.1%	Rank history: not on the FY2022–FY2024 lists and #35 in FY2025; up 1 since FY2020.
93	B & M Scale Inc. Top agencies DLA (Defense Logistics Agency)	$8,652	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 1 since FY2020.
94	Newco Inc. Top agencies Navy (Department of the Navy)	$8,400	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Sumitomo Heavy Industries, Ltd. Through Sumitomo (Shi) Cryogenics of America Inc. Top agencies USAF (Department of the Air Force)	$8,100	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
96	Fluke Electronics Corp Top agencies Navy (Department of the Navy)	$7,166	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
97	Pine Environmental Services LLC Top agencies DCMA (Defense Contract Management Agency)	$6,839	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 21 since FY2020.
98	Roberts Calibration, Inc. Top agencies Navy (Department of the Navy)	$6,739	<0.1%	Rank history: not on the FY2022–FY2023 lists, #68 in FY2024 and not on the FY2025 list; up 2 since FY2020.
99	UE Systems Inc. Top agencies USAF (Department of the Air Force)	$6,588	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
100	Bearings & Drives Inc. Through Scale Systems Inc. Top agencies DLA (Defense Logistics Agency)	$6,574	<0.1%	Rank history: not on the FY2022 list, #65 in FY2023 and not on the FY2024–FY2025 lists; down 44 since FY2020.

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100 of 124 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 $49 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 J052 contractors in FY2021?

1. Calista Corp ($15M), 2. Apro International, Inc. ($13.2M), 3. Goldbelt, Incorporated ($6.62M), 4. Mesotech International, Inc. ($2.37M), 5. Kbr, Inc. ($2.01M), 6. Science and Management Resources, Inc. ($1.78M), 7. Haight Bey & Associates LLC ($1.38M), 8. Teradyne Inc. ($669K), 9. R & D Scientific Corp ($479K), 10. The Aleut Corporation ($386K).

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