Top 100 Contractors in NAICS 333912: Air and Gas Compressor Manufacturing, FY2021

Name: Top 100 Contractors in NAICS 333912: Air and Gas Compressor Manufacturing, FY2021
Creator: GovTribe

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

The top 10 won 44% of FY2021 NAICS 333912 contract dollars

Contract obligations: $56,025,094 Net of deobligations, by contracts coded NAICS 333912
Contractors: 427 Parent companies with an obligation
Largest contractor: Argo Turboserve Corporation $6.34 million, 11.0% 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	Argo Turboserve Corporation 2 awardees Top agencies DLA (Defense Logistics Agency)	$6,339,514	11.0%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #2 in FY2025; up 2 since FY2020.
2	Curtiss-Wright Corporation 2 awardees, including Curtiss-Wright Electro-Mechanical Corp Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$6,257,281	10.8%	Rank history: #1 in FY2022, #2 in FY2023, #4 in FY2024 and not on the FY2025 list; up 5 since FY2020.
3	Advanced Products Services Inc. Top agencies DLA (Defense Logistics Agency)	$2,644,972	4.6%	Rank history: #5 in FY2022, #5 in FY2023, #12 in FY2024 and not on the FY2025 list; up 8 since FY2020.
4	RIX Industries Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,913,986	3.3%	Rank history: #15 in FY2022, #3 in FY2023, #5 in FY2024 and #12 in FY2025; up 2 since FY2020.
5	Johnson Controls Security Solutions LLC Through Johnson Controls Navy Systems, LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,806,847	3.1%	Rank history: #4 in FY2022, #9 in FY2023, #20 in FY2024 and not on the FY2025 list; up 3 since FY2020.
6	Federal Resources Supply Company, LLC 2 awardees Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$1,642,680	2.8%	Rank history: #7 in FY2022, #8 in FY2023, #7 in FY2024 and not on the FY2025 list; down 1 since FY2020.
7	Compressor Engineering Corp Top agencies DLA (Defense Logistics Agency)	$1,254,694	2.2%	Rank history: #9 in FY2022, #10 in FY2023, #27 in FY2024 and #9 in FY2025; up 23 since FY2020.
8	Doosan Infracore Co., Ltd. Through Doosan Bobcat North America, Inc. Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$1,253,799	2.2%	Rank history: not on the FY2022 list, #79 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
9	Warren Pumps LLC Through Circor Naval Solutions LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$1,205,145	2.1%	Rank history: not on the FY2022–FY2025 lists; up 18 since FY2020.
10	Sauer Compressors USA Inc. 2 awardees Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$1,155,456	2.0%	Rank history: #8 in FY2022, #20 in FY2023, #6 in FY2024 and #13 in FY2025; up 12 since FY2020.
11	Phoenix Systems Engineering Inc. Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$1,047,318	1.8%	Rank history: #10 in FY2022, #6 in FY2023, #13 in FY2024 and #8 in FY2025; down 2 since FY2020.
12	The Millennium Group Int'l LLC Top agencies Navy (Department of the Navy)	$1,046,808	1.8%	Rank history: #78 in FY2022 and not on the FY2023–FY2025 lists; up 429 since FY2020.
13	Tiberian Development Group LLC Top agencies DLA (Defense Logistics Agency)	$1,031,826	1.8%	Rank history: #14 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
14	Ceco Environmental Corp Through Peerless MFG Co Top agencies DLA (Defense Logistics Agency)	$892,370	1.5%	Rank history: not on the FY2022–FY2025 lists; up 5 since FY2020.
15	Horstman Inc. Top agencies DLA (Defense Logistics Agency)	$871,520	1.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
16	Kool Radiator Service Inc. Top agencies DLA (Defense Logistics Agency)	$805,922	1.4%	Rank history: #20 in FY2022, #23 in FY2023, #10 in FY2024 and not on the FY2025 list; down 2 since FY2020.
17	Gardner Denver Nash LLC Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$804,133	1.4%	Rank history: #26 in FY2022, #22 in FY2023, #28 in FY2024 and #20 in FY2025; down 1 since FY2020.
18	Aerocontrolex Group, Inc. Top agencies Army (Department of the Army)	$789,345	1.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	S I T Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$755,885	1.3%	Rank history: #12 in FY2022, #7 in FY2023, #3 in FY2024 and #7 in FY2025; down 6 since FY2020.
20	Gentex Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$633,725	1.1%	Rank history: #6 in FY2022, #11 in FY2023, #11 in FY2024 and #14 in FY2025; up 284 since FY2020.
21	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency)	$613,792	1.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; up 3 since FY2020.
22	Kozco Mechanical Inc. Top agencies USAF (Department of the Air Force)	$566,935	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
23	B & H International LLC Top agencies USAF (Department of the Air Force) Army (Department of the Army) Navy (Department of the Navy)	$548,341	1.0%	Rank history: #22 in FY2022 and not on the FY2023–FY2025 lists; up 81 since FY2020.
24	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$505,254	0.9%	Rank history: #3 in FY2022, #21 in FY2023, #16 in FY2024 and #22 in FY2025; up 102 since FY2020.
25	Hydraulics International, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) Navy (Department of the Navy)	$466,805	0.8%	Rank history: #13 in FY2022, #12 in FY2023, #18 in FY2024 and #16 in FY2025; down 24 since FY2020.
26	Pankl Turbosystems GMBH Top agencies Army (Department of the Army)	$457,600	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	Jarvis Group Inc Through Jarvis Airfoil Inc. Top agencies USAF (Department of the Air Force)	$456,556	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
28	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$429,513	0.7%	Rank history: #11 in FY2022, #18 in FY2023, #9 in FY2024 and #18 in FY2025; down 11 since FY2020.
29	Theodor Wille Intertrade GMBH Through Atlantic Diving Supply, Inc. Top agencies DLA (Defense Logistics Agency) DOI (Department of the Interior)	$427,961	0.7%	Rank history: not on the FY2022 list, #30 in FY2023 and not on the FY2024–FY2025 lists; unchanged since FY2020.
30	Parker-Hannifin Corporation 2 awardees Top agencies DLA (Defense Logistics Agency)	$423,007	0.7%	Rank history: not on the FY2022 list, #83 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
31	Delta Pump & Systems Inc. Top agencies DLA (Defense Logistics Agency)	$329,431	0.6%	Rank history: not on the FY2022–FY2025 lists; up 26 since FY2020.
32	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$306,234	0.5%	Rank history: #24 in FY2022, #58 in FY2023, #49 in FY2024 and #41 in FY2025; up 41 since FY2020.
33	Breezer Holdings, LLC Top agencies DLA (Defense Logistics Agency)	$297,000	0.5%	Rank history: #100 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
34	Trane U.S. Inc. Through Ingersoll-Rand Company Top agencies Treasury (Department of the Treasury)	$288,602	0.5%	Rank history: #37 in FY2022 and not on the FY2023–FY2025 lists; up 6 since FY2020.
35	Interra Global Corp Top agencies USAF (Department of the Air Force)	$271,805	0.5%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Northwest Pump & Equipment Co. Top agencies Commerce (Department of Commerce) DOE (Department of Energy)	$254,617	0.4%	Rank history: not on the FY2022 list, #46 in FY2023 and not on the FY2024–FY2025 lists; up 49 since FY2020.
37	Meggitt PLC Through Meggitt Defense Systems, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$254,350	0.4%	Rank history: #88 in FY2022 and not on the FY2023–FY2025 lists; up 59 since FY2020.
38	Hydro Engineering Inc. Top agencies USAF (Department of the Air Force) DOI (Department of the Interior)	$246,166	0.4%	Rank history: #60 in FY2022, #13 in FY2023, #19 in FY2024 and #38 in FY2025; down 26 since FY2020.
39	LBS Enterprises Inc. Top agencies Army (Department of the Army) DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$242,666	0.4%	Rank history: #74 in FY2022, #49 in FY2023, #58 in FY2024 and #86 in FY2025; down 21 since FY2020.
40	Airgas Inc. 2 awardees, including Airgas Usa, LLC Top agencies DHA (Defense Health Agency) Smithsonian (Smithsonian Institution)	$238,720	0.4%	Rank history: #36 in FY2022 and not on the FY2023–FY2025 lists; down 5 since FY2020.
41	Rev-Cap Company, Inc. Top agencies DLA (Defense Logistics Agency)	$227,293	0.4%	Rank history: #28 in FY2022, #27 in FY2023, #71 in FY2024 and not on the FY2025 list; up 12 since FY2020.
42	5.11 Inc. Through Crosman Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy)	$226,557	0.4%	Rank history: not on the FY2022–FY2025 lists; up 6 since FY2020.
43	Clayton Associates Inc. Top agencies DLA (Defense Logistics Agency)	$225,878	0.4%	Rank history: not on the FY2022 list, #92 in FY2023, #95 in FY2024 and #72 in FY2025; up 97 since FY2020.
44	TNL Sales LLC Top agencies DLA (Defense Logistics Agency)	$222,588	0.4%	Rank history: not on the FY2022 list, #37 in FY2023 and not on the FY2024–FY2025 lists; up 154 since FY2020.
45	Megabite Electronics, Inc. Top agencies DLA (Defense Logistics Agency)	$216,330	0.4%	Rank history: not on the FY2022 list, #81 in FY2023 and not on the FY2024–FY2025 lists; up 255 since FY2020.
46	Aantilia LLC Top agencies HHS (Department of Health and Human Services) Navy (Department of the Navy)	$212,870	0.4%	Rank history: #27 in FY2022, #69 in FY2023, #29 in FY2024 and #39 in FY2025; up 105 since FY2020.
47	Air Capital Equipment, Inc. Top agencies Army (Department of the Army)	$211,270	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
48	Stealth Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$199,771	0.3%	Rank history: not on the FY2022–FY2023 lists, #37 in FY2024 and not on the FY2025 list; up 186 since FY2020.
49	Universal Air Products Company, LLC Top agencies Navy (Department of the Navy)	$190,289	0.3%	Rank history: not on the FY2022–FY2025 lists; up 31 since FY2020.
50	AB SKF Through Kaydon Ring & Seal Inc. Top agencies DLA (Defense Logistics Agency)	$188,335	0.3%	Rank history: #43 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 45 since FY2020.
51	Compressed Air Specialties, Inc. Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$186,150	0.3%	Rank history: #56 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
52	Martin Military Inc. Top agencies DLA (Defense Logistics Agency)	$181,920	0.3%	Rank history: not on the FY2022 list, #70 in FY2023, #26 in FY2024 and #23 in FY2025; new, not ranked in FY2020.
53	Millennium Technology of Iowa Corporation Top agencies DLA (Defense Logistics Agency)	$180,911	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
54	Chesapeake Marine Refrigeration Corp Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$180,200	0.3%	Rank history: not on the FY2022–FY2025 lists; up 36 since FY2020.
55	Air Squared, LLC Top agencies NASA (National Aeronautics and Space Administration)	$178,296	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
56	Fincantieri Marine Systems North America Inc. Top agencies DLA (Defense Logistics Agency)	$176,148	0.3%	Rank history: #62 in FY2022 and not on the FY2023–FY2025 lists; down 12 since FY2020.
57	Pacific Consolidated Industries LLC Top agencies USAF (Department of the Air Force) DLA (Defense Logistics Agency)	$169,278	0.3%	Rank history: #25 in FY2022, #4 in FY2023 and not on the FY2024–FY2025 lists; up 40 since FY2020.
58	Rogers Machinery Company Inc. 2 awardees Top agencies Army (Department of the Army) VA (Department of Veterans Affairs)	$168,504	0.3%	Rank history: #21 in FY2022, #14 in FY2023, #78 in FY2024 and #35 in FY2025; new, not ranked in FY2020.
59	The Belting Company of Cincinnati Top agencies DLA (Defense Logistics Agency)	$157,703	0.3%	Rank history: not on the FY2022–FY2025 lists; up 378 since FY2020.
60	Logistical Support Team International, LLC Top agencies Army (Department of the Army)	$157,000	0.3%	Rank history: not on the FY2022 list, #44 in FY2023 and not on the FY2024–FY2025 lists; up 175 since FY2020.
61	Safe Air Systems, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy)	$154,797	0.3%	Rank history: not on the FY2022–FY2025 lists; up 310 since FY2020.
62	Kaeser Compressors Inc. Top agencies DOJ (Department of Justice) Army (Department of the Army) Navy (Department of the Navy)	$149,969	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
63	Lee Engineering Supply Company, Inc. Top agencies Navy (Department of the Navy)	$147,724	0.3%	Rank history: not on the FY2022 list, #32 in FY2023, not on the FY2024 list and #79 in FY2025; up 102 since FY2020.
64	Royce Construction Services, LLC Top agencies VA (Department of Veterans Affairs)	$146,329	0.3%	Rank history: not on the FY2022–FY2025 lists; up 23 since FY2020.
65	Powerhouse Equipment & Engineering Co. Inc. 4 awardees, including Beaconmedaes LLC, Quincy Compressor LLC and Edwards Vacuum LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) USAF (Department of the Air Force)	$144,105	0.2%	Rank history: #17 in FY2022, #19 in FY2023, #61 in FY2024 and not on the FY2025 list; up 109 since FY2020.
66	LN Curtis & Sons Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$141,016	0.2%	Rank history: #35 in FY2022, #28 in FY2023, #44 in FY2024 and not on the FY2025 list; down 11 since FY2020.
67	Inland Control Systems LLC Top agencies DOI (Department of the Interior)	$137,462	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
68	Highland Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$133,811	0.2%	Rank history: not on the FY2022–FY2025 lists; up 78 since FY2020.
69	Dreamfind, Inc. Top agencies DLA (Defense Logistics Agency)	$131,881	0.2%	Rank history: not on the FY2022 list, #17 in FY2023, #22 in FY2024 and not on the FY2025 list; down 31 since FY2020.
70	Govage, Inc. Top agencies USAF (Department of the Air Force)	$126,006	0.2%	Rank history: not on the FY2022 list, #51 in FY2023, not on the FY2024 list and #63 in FY2025; up 86 since FY2020.
71	Honeywell International Inc. Top agencies Navy (Department of the Navy)	$120,690	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Apex Pinnacle Corp Top agencies Army (Department of the Army) DLA (Defense Logistics Agency)	$118,749	0.2%	Rank history: not on the FY2022–FY2025 lists; up 3 since FY2020.
73	Air Systems and Pump Solutions, L.L.C. Top agencies USAF (Department of the Air Force)	$118,168	0.2%	Rank history: not on the FY2022 list, #35 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
74	Curtiss-Wright Electro-Mechanical Corp Top agencies DLA (Defense Logistics Agency)	$117,172	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Piedmont Pump and Products, Inc. Top agencies DHS (Department of Homeland Security)	$115,287	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
76	Har-Per Sales Solutions Inc. Top agencies Navy (Department of the Navy)	$115,200	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
77	Anchor Werther LLC Top agencies Army (Department of the Army)	$114,750	0.2%	Rank history: #81 in FY2022, not on the FY2023–FY2024 lists and #97 in FY2025; up 103 since FY2020.
78	B & P Consort, Inc. Top agencies Army (Department of the Army)	$110,540	0.2%	Rank history: #96 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
79	Ruta Supplies Inc. Top agencies DLA (Defense Logistics Agency)	$110,232	0.2%	Rank history: #87 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; up 118 since FY2020.
80	Federal Contracts LLC Top agencies USAF (Department of the Air Force)	$108,447	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Kalus Kuehlwassertechnik GMBH Top agencies Army (Department of the Army)	$104,723	0.2%	Rank history: #94 in FY2022 and not on the FY2023–FY2025 lists; up 39 since FY2020.
82	Defense Venture Holdings, LLC Top agencies DHS (Department of Homeland Security)	$103,473	0.2%	Rank history: not on the FY2022 list, #55 in FY2023, not on the FY2024 list and #33 in FY2025; up 63 since FY2020.
83	Blue Cord Logistic Strategies Inc. Top agencies DLA (Defense Logistics Agency)	$101,898	0.2%	Rank history: not on the FY2022–FY2025 lists; down 37 since FY2020.
84	Walker Miller Equipment Company, Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior)	$98,614	0.2%	Rank history: not on the FY2022–FY2023 lists, #41 in FY2024 and not on the FY2025 list; down 12 since FY2020.
85	W S Darley & Co Through WS Darley & Co Top agencies DLA (Defense Logistics Agency)	$96,120	0.2%	Rank history: #19 in FY2022, not on the FY2023 list, #73 in FY2024 and #50 in FY2025; down 62 since FY2020.
86	C & D Equipment Company, Inc. Top agencies DLA (Defense Logistics Agency)	$94,375	0.2%	Rank history: #86 in FY2022, #87 in FY2023, not on the FY2024 list and #67 in FY2025; up 8 since FY2020.
87	Aqua-Chem, Inc. Top agencies DLA (Defense Logistics Agency)	$90,156	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	All Equipment Co Top agencies DLA (Defense Logistics Agency)	$89,024	0.2%	Rank history: #34 in FY2022, #29 in FY2023, #66 in FY2024 and #37 in FY2025; down 54 since FY2020.
89	Supplied Industrial Solutions, Inc. Top agencies USAF (Department of the Air Force)	$87,422	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
90	Special Projects Operations, Inc. Top agencies DOJ (Department of Justice) Army (Department of the Army)	$86,839	0.2%	Rank history: not on the FY2022–FY2025 lists; up 70 since FY2020.
91	Divebase International Inc. Top agencies USAF (Department of the Air Force)	$85,109	0.1%	Rank history: not on the FY2022–FY2025 lists; up 305 since FY2020.
92	DJ Aviations (Fze) Top agencies DLA (Defense Logistics Agency)	$84,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Shipman's Fire Equipment Company, Inc. Top agencies USAF (Department of the Air Force)	$81,828	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Thomas-Guy Limited Through Waltron Bull & Roberts, LLC Top agencies Navy (Department of the Navy)	$81,776	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	Air Compressor Works Inc. Top agencies VA (Department of Veterans Affairs)	$81,000	0.1%	Rank history: not on the FY2022–FY2025 lists; up 14 since FY2020.
96	C.h. Reed, Inc. Top agencies DLA (Defense Logistics Agency)	$79,600	0.1%	Rank history: not on the FY2022–FY2025 lists; up 233 since FY2020.
97	Melton Sales & Service Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$79,361	0.1%	Rank history: not on the FY2022–FY2025 lists; up 56 since FY2020.
98	Lynn Electronics LLC Top agencies DLA (Defense Logistics Agency)	$77,995	0.1%	Rank history: not on the FY2022–FY2025 lists; up 10 since FY2020.
99	Central Power Systems & Services, LLC Top agencies DLA (Defense Logistics Agency)	$77,459	0.1%	Rank history: #83 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
100	G.D USA Inc. Top agencies HHS (Department of Health and Human Services)	$77,377	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

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100 of 427 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 $57.7 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.

Quick answers

Who were the top 10 NAICS 333912 contractors in FY2021?

1. Argo Turboserve Corporation ($6.34M), 2. Curtiss-Wright Corporation ($6.26M), 3. Advanced Products Services Inc. ($2.64M), 4. RIX Industries ($1.91M), 5. Johnson Controls Security Solutions LLC ($1.81M), 6. Federal Resources Supply Company, LLC ($1.64M), 7. Compressor Engineering Corp ($1.25M), 8. Doosan Infracore Co., Ltd. ($1.25M), 9. Warren Pumps LLC ($1.21M), 10. Sauer Compressors USA Inc. ($1.16M).

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