Top 100 Contractors in PSC 45: Plumbing, Heating, Waste Disposal, FY2021

Name: Top 100 Contractors in PSC 45: Plumbing, Heating, Waste Disposal, FY2021
Creator: GovTribe

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

The top 10 won 34% of FY2021 PSC 45 contract dollars

Contract obligations: $80,002,462 Net of deobligations, by contracts coded PSC 45 or a code under it
Contractors: 665 Parent companies with an obligation
Largest contractor: ECO Burn Inc. $10 million, 11.9% 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	ECO Burn Inc. Through Enercon Systems Inc. Top agencies Army (Department of the Army)	$10,020,301	11.9%	Rank history: #17 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
2	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$3,482,600	4.1%	Rank history: #3 in FY2022, #2 in FY2023, #4 in FY2024 and #2 in FY2025; up 1 since FY2020.
3	San-I-Pak Pacific, Inc. Top agencies VA (Department of Veterans Affairs)	$3,172,265	3.8%	Rank history: #2 in FY2022, #12 in FY2023, #8 in FY2024 and not on the FY2025 list; up 2 since FY2020.
4	Argo Turboserve Corporation 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$2,214,937	2.6%	Rank history: #9 in FY2022, #8 in FY2023, #6 in FY2024 and #4 in FY2025; up 9 since FY2020.
5	Allied Marine Services LLC 2 awardees Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$1,908,765	2.3%	Rank history: #8 in FY2022, not on the FY2023 list, #41 in FY2024 and not on the FY2025 list; up 28 since FY2020.
6	Vantex Service Corporation Top agencies Army (Department of the Army) Navy (Department of the Navy)	$1,670,969	2.0%	Rank history: #12 in FY2022, #14 in FY2023, #10 in FY2024 and #13 in FY2025; up 60 since FY2020.
7	Government of Canada Through Canadian Commercial Corporation Top agencies DLA (Defense Logistics Agency)	$1,579,674	1.9%	Rank history: #85 in FY2022, #29 in FY2023 and not on the FY2024–FY2025 lists; down 1 since FY2020.
8	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$1,540,012	1.8%	Rank history: #19 in FY2022, #13 in FY2023, #17 in FY2024 and #21 in FY2025; up 6 since FY2020.
9	ECI Defense Group, Inc. 2 awardees Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$1,480,729	1.8%	Rank history: #15 in FY2022, #7 in FY2023, #7 in FY2024 and #15 in FY2025; up 3 since FY2020.
10	Fourinox, Inc. Top agencies Navy (Department of the Navy)	$1,455,000	1.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
11	B & S Services Top agencies DHS (Department of Homeland Security)	$1,396,665	1.7%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
12	Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$1,348,076	1.6%	Rank history: #10 in FY2022, #26 in FY2023, #23 in FY2024 and #19 in FY2025; down 4 since FY2020.
13	Flightfab, Inc. Top agencies DLA (Defense Logistics Agency)	$1,221,981	1.5%	Rank history: #5 in FY2022, #3 in FY2023, #3 in FY2024 and #6 in FY2025; up 18 since FY2020.
14	Allied Defense Industries Inc. 2 awardees, including Allied Marine Services LLC Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$987,653	1.2%	Rank history: #18 in FY2022, #4 in FY2023, #33 in FY2024 and not on the FY2025 list; down 7 since FY2020.
15	NGH Retail LLC Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$975,402	1.2%	Rank history: not on the FY2022–FY2025 lists; up 238 since FY2020.
16	Alphapointe Top agencies DLA (Defense Logistics Agency)	$971,440	1.2%	Rank history: #13 in FY2022, #34 in FY2023, #20 in FY2024 and #18 in FY2025; down 1 since FY2020.
17	Phillips Environmental Products, Inc. Top agencies DLA (Defense Logistics Agency)	$839,557	1.0%	Rank history: #14 in FY2022, #22 in FY2023, #16 in FY2024 and #10 in FY2025; up 6 since FY2020.
18	Atap Inc. Top agencies USAF (Department of the Air Force)	$823,620	1.0%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
19	United Site Services, Inc. Top agencies DHS (Department of Homeland Security)	$766,306	0.9%	Rank history: #33 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
20	Gardner Co Inc. Top agencies DMA (Defense Media Activity)	$755,686	0.9%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
21	Rev-Cap Company, Inc. Top agencies DLA (Defense Logistics Agency)	$735,424	0.9%	Rank history: #54 in FY2022, not on the FY2023–FY2024 lists and #60 in FY2025; up 27 since FY2020.
22	Lockheed Martin Corporation 4 awardees, including Sikorsky Aircraft Corporation and Derco Aerospace, Inc. Top agencies DLA (Defense Logistics Agency)	$695,602	0.8%	Rank history: #20 in FY2022, #15 in FY2023, #5 in FY2024 and #1 in FY2025; up 14 since FY2020.
23	Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$669,191	0.8%	Rank history: #32 in FY2022 and not on the FY2023–FY2025 lists; down 1 since FY2020.
24	Waterbury Plumbing & Heating Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$663,284	0.8%	Rank history: #27 in FY2022, #17 in FY2023, #14 in FY2024 and #14 in FY2025; down 5 since FY2020.
25	Pennram Diversified Manufacturing Corp Top agencies DOI (Department of the Interior) DOS (Department of State)	$641,612	0.8%	Rank history: not on the FY2022–FY2025 lists; down 15 since FY2020.
26	Stone Hill Contracting Co., Inc. Top agencies Treasury (Department of the Treasury)	$636,000	0.8%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
27	Air Pollution Control Products Inc. Top agencies WHS (DOD Washington Headquarters Service)	$578,616	0.7%	Rank history: #25 in FY2022, #16 in FY2023, #24 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
28	Phoenix Systems Engineering Inc. Top agencies DOJ (Department of Justice) DLA (Defense Logistics Agency) Army (Department of the Army)	$576,690	0.7%	Rank history: #75 in FY2022, not on the FY2023 list, #39 in FY2024 and #77 in FY2025; up 27 since FY2020.
29	Morning Star Industries Inc. Top agencies Navy (Department of the Navy)	$576,296	0.7%	Rank history: not on the FY2022–FY2024 lists and #34 in FY2025; new, not ranked in FY2020.
30	Electric Heater Company the Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$566,423	0.7%	Rank history: #21 in FY2022, #10 in FY2023 and not on the FY2024–FY2025 lists; down 2 since FY2020.
31	Boneal, Incorporated 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$560,617	0.7%	Rank history: not on the FY2022 list, #18 in FY2023, #15 in FY2024 and #5 in FY2025; down 29 since FY2020.
32	Johnson Controls Security Solutions LLC 2 awardees, including Johnson Controls, Inc. and Johnson Controls Navy Systems, LLC Top agencies DOJ (Department of Justice) DLA (Defense Logistics Agency)	$546,798	0.7%	Rank history: #45 in FY2022, #77 in FY2023 and not on the FY2024–FY2025 lists; up 41 since FY2020.
33	Nilofer Battiwala Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$541,650	0.6%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
34	Independent Hardware Inc. Top agencies DLA (Defense Logistics Agency) GSA (General Services Administration)	$497,203	0.6%	Rank history: #44 in FY2022, #97 in FY2023, #71 in FY2024 and not on the FY2025 list; up 13 since FY2020.
35	Phoenix Contracting LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$470,296	0.6%	Rank history: not on the FY2022–FY2025 lists; up 174 since FY2020.
36	Ranger Land Systems, Inc. Top agencies DHS (Department of Homeland Security)	$443,675	0.5%	Rank history: #6 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
37	RTX Corporation 3 awardees, including Hamilton Sundstrand Corporation and Raytheon Company Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$404,373	0.5%	Rank history: not on the FY2022–FY2023 lists, #96 in FY2024 and not on the FY2025 list; up 14 since FY2020.
38	International Thermal Research Ltd Top agencies DLA (Defense Logistics Agency)	$383,560	0.5%	Rank history: #16 in FY2022, #47 in FY2023, #36 in FY2024 and #69 in FY2025; up 188 since FY2020.
39	Industrial Engineering and Equipment Company Incorporated 2 awardees, including Indeeco LLC and Aspeq Heating Group LLC Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy) Smithsonian (Smithsonian Institution)	$363,012	0.4%	Rank history: #86 in FY2022, #75 in FY2023, #30 in FY2024 and not on the FY2025 list; up 10 since FY2020.
40	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$337,991	0.4%	Rank history: not on the FY2022 list, #39 in FY2023 and not on the FY2024–FY2025 lists; up 73 since FY2020.
41	OEM Laundry Parts, Llc. Top agencies DLA (Defense Logistics Agency)	$325,965	0.4%	Rank history: #70 in FY2022 and not on the FY2023–FY2025 lists; up 27 since FY2020.
42	Burhani Enterprises Inc. Top agencies DLA (Defense Logistics Agency)	$312,890	0.4%	Rank history: #43 in FY2022, #25 in FY2023, not on the FY2024 list and #75 in FY2025; down 5 since FY2020.
43	Empire Pump Corp Top agencies USAF (Department of the Air Force)	$312,745	0.4%	Rank history: not on the FY2022–FY2025 lists; down 2 since FY2020.
44	Vertex LLC Top agencies DLA (Defense Logistics Agency)	$301,395	0.4%	Rank history: not on the FY2022–FY2025 lists; up 367 since FY2020.
45	Utility Systems Solutions, Inc. Top agencies VA (Department of Veterans Affairs)	$297,635	0.4%	Rank history: #34 in FY2022, #99 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
46	Integral Aerospace, LLC Top agencies DLA (Defense Logistics Agency)	$295,800	0.4%	Rank history: not on the FY2022–FY2025 lists; up 209 since FY2020.
47	S I T Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$290,575	0.3%	Rank history: #79 in FY2022, not on the FY2023 list, #67 in FY2024 and #16 in FY2025; down 20 since FY2020.
48	W.w. Grainger, Inc. Top agencies GSA (General Services Administration) DOS (Department of State) Smithsonian (Smithsonian Institution)	$272,053	0.3%	Rank history: #61 in FY2022, #98 in FY2023 and not on the FY2024–FY2025 lists; down 23 since FY2020.
49	A&B Foundry, LLC Top agencies DLA (Defense Logistics Agency)	$268,290	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
50	Leonardo S.p.A. Through Engineered Coil Company Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$261,247	0.3%	Rank history: not on the FY2022–FY2023 lists, #38 in FY2024 and #39 in FY2025; down 30 since FY2020.
51	GPC Consolidated Reporting Top agencies USDA (Department of Agriculture)	$257,441	0.3%	Rank history: not on the FY2022–FY2025 lists; up 219 since FY2020.
52	Nihon Highway Service Co. Ltd. Top agencies Army (Department of the Army)	$252,568	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
53	Wisecom Technologies Inc. Top agencies Army (Department of the Army)	$246,169	0.3%	Rank history: not on the FY2022 list, #81 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
54	Martin Military Inc. Top agencies DLA (Defense Logistics Agency)	$245,271	0.3%	Rank history: not on the FY2022–FY2025 lists; up 108 since FY2020.
55	Kipper Tool Company Top agencies DLA (Defense Logistics Agency) Army (Department of the Army)	$239,939	0.3%	Rank history: not on the FY2022–FY2025 lists; up 156 since FY2020.
56	J & N Marketing, Inc. Top agencies DOI (Department of the Interior)	$237,925	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
57	Gill Group Inc. Top agencies VA (Department of Veterans Affairs) DLA (Defense Logistics Agency) DHA (Defense Health Agency)	$237,352	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
58	THC Enterprises Inc. Top agencies Navy (Department of the Navy)	$230,138	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
59	Jay & R LLC Top agencies DOI (Department of the Interior)	$229,710	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
60	Wise Environmental Solutions Inc. Top agencies Army (Department of the Army)	$227,382	0.3%	Rank history: #49 in FY2022, not on the FY2023 list, #28 in FY2024 and not on the FY2025 list; down 15 since FY2020.
61	Commercial Parts & Service of Columbus, Ohio, Inc. Top agencies DLA (Defense Logistics Agency)	$222,856	0.3%	Rank history: #63 in FY2022, #85 in FY2023 and not on the FY2024–FY2025 lists; up 44 since FY2020.
62	American Innotek, Inc. Top agencies DLA (Defense Logistics Agency)	$222,735	0.3%	Rank history: #31 in FY2022 and not on the FY2023–FY2025 lists; up 98 since FY2020.
63	Highland Engineering, Inc. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$221,075	0.3%	Rank history: #22 in FY2022, #91 in FY2023 and not on the FY2024–FY2025 lists; down 45 since FY2020.
64	INCINER8 Ltd Top agencies HHS (Department of Health and Human Services)	$220,540	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
65	Sauer Compressors USA Inc. Top agencies DHS (Department of Homeland Security)	$217,273	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
66	Lionheart Holdings LLC Through Selas Heat Technology Company LLC Top agencies DHS (Department of Homeland Security)	$214,307	0.3%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.
67	The Goode Companies, Inc. Top agencies SSA (Social Security Administration)	$213,760	0.3%	Rank history: #59 in FY2022, #69 in FY2023 and not on the FY2024–FY2025 lists; down 10 since FY2020.
68	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency)	$207,317	0.2%	Rank history: not on the FY2022–FY2025 lists; down 39 since FY2020.
69	United Site Services of Nevada, Inc. Top agencies Army (Department of the Army)	$206,498	0.2%	Rank history: #58 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
70	Jazaroo PTY Ltd Top agencies DLA (Defense Logistics Agency)	$206,250	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
71	Waste Strategies LLC Top agencies DHS (Department of Homeland Security)	$205,335	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	Air Burners, Inc. Top agencies Army (Department of the Army)	$204,870	0.2%	Rank history: not on the FY2022 list, #23 in FY2023, #74 in FY2024 and #59 in FY2025; new, not ranked in FY2020.
73	U.s. Naval Plumbing LLC Top agencies DLA (Defense Logistics Agency)	$202,625	0.2%	Rank history: not on the FY2022–FY2023 lists, #94 in FY2024 and #30 in FY2025; up 17 since FY2020.
74	The Jahnda Group, LLC Top agencies DOJ (Department of Justice)	$200,787	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
75	Outdoor Venture Corp 2 awardees, including Ovc-Engineered Solutions LLC Top agencies DLA (Defense Logistics Agency)	$200,026	0.2%	Rank history: not on the FY2022 list, #83 in FY2023 and not on the FY2024–FY2025 lists; down 23 since FY2020.
76	BAE Systems PLC 3 awardees, including BAE Systems Maritime Solutions San Diego Inc., BAE Systems Information & Electronic Systems Integration Inc. and BAE Systems Land & Armaments L.P. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$199,581	0.2%	Rank history: not on the FY2022 list, #86 in FY2023 and not on the FY2024–FY2025 lists; down 14 since FY2020.
77	U S Thermal Inc. Top agencies DLA (Defense Logistics Agency)	$195,691	0.2%	Rank history: not on the FY2022–FY2025 lists; up 8 since FY2020.
78	H.i.g. Capital Management Inc. Through Wastequip Manufacturing Co LLC Top agencies DOJ (Department of Justice)	$194,367	0.2%	Rank history: not on the FY2022–FY2025 lists; up 351 since FY2020.
79	Big Belly Solar, LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$193,667	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
80	Century Industries, LLC Top agencies USAF (Department of the Air Force)	$190,221	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
81	Advanced Radiant Systems Inc. Through Hale Industries, Inc. Top agencies USAF (Department of the Air Force)	$186,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
82	Adedge Water Technologies LLC Top agencies USAF (Department of the Air Force)	$179,174	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Danaher Corporation Through Pall Corp Top agencies VA (Department of Veterans Affairs)	$176,400	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
84	Porter Manufacturing, L.L.C. Top agencies DLA (Defense Logistics Agency)	$175,177	0.2%	Rank history: not on the FY2022–FY2025 lists; down 34 since FY2020.
85	B & H International LLC Top agencies DOI (Department of the Interior) DHS (Department of Homeland Security) Navy (Department of the Navy)	$173,349	0.2%	Rank history: not on the FY2022–FY2025 lists; up 290 since FY2020.
86	Surefin Mechanical Equipment Inc. Top agencies DLA (Defense Logistics Agency)	$171,865	0.2%	Rank history: #82 in FY2022, #90 in FY2023 and not on the FY2024–FY2025 lists; down 9 since FY2020.
87	Kelly Computer Supply Company, LLC Top agencies DOI (Department of the Interior)	$170,145	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
88	Chromalox Inc. 2 awardees Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$169,747	0.2%	Rank history: not on the FY2022–FY2025 lists; up 188 since FY2020.
89	Box Gang Manufacturing LLC Top agencies DOJ (Department of Justice)	$163,848	0.2%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
90	GTA Marine Top agencies DHS (Department of Homeland Security)	$162,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
91	Aktio Corporation Top agencies Navy (Department of the Navy)	$161,586	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
92	Araiza Company, LLC Top agencies DLA (Defense Logistics Agency)	$156,576	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
93	Cambo LLC Top agencies DOJ (Department of Justice)	$156,000	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
94	Premier & Companies, Inc. Top agencies USDA (Department of Agriculture) DHS (Department of Homeland Security) JFK (John F. Kennedy Center for the Performing Arts)	$155,629	0.2%	Rank history: #95 in FY2022 and not on the FY2023–FY2025 lists; up 53 since FY2020.
95	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$152,901	0.2%	Rank history: #98 in FY2022, #53 in FY2023, #37 in FY2024 and #51 in FY2025; down 15 since FY2020.
96	Stealth Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$152,788	0.2%	Rank history: not on the FY2022–FY2025 lists; down 25 since FY2020.
97	Whitton Construction, LLC Top agencies DOT (Department of Transportation)	$150,139	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
98	Seahorse Defense Supply, LLC Top agencies DHS (Department of Homeland Security) Navy (Department of the Navy)	$149,904	0.2%	Rank history: not on the FY2022–FY2025 lists; up 255 since FY2020.
99	Valad Electric Heating Corp. Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security)	$149,865	0.2%	Rank history: #76 in FY2022, not on the FY2023 list, #59 in FY2024 and #74 in FY2025; down 29 since FY2020.
100	Toilet TECH Solutions LLC Top agencies USDA (Department of Agriculture)	$149,636	0.2%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.

Show 75 more

100 of 665 contractors listed here. See the rest on GovTribe.

Rankings for the codes under PSC 45

Code	Net obligations	Largest contractor
4540 Waste Disposal Equipment	$31,079,705	ECO Burn Inc.
4520 Space and Water Heating Equipment	$26,014,554	Windward Enterprises, LLC
4510 Plumbing Fixtures and Accessories	$21,117,221	Allied Marine Services LLC
4530 Fuel Burning Equipment Units	$1,790,981	Integral Aerospace, LLC

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 $84 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 45 contractors in FY2021?

1. ECO Burn Inc. ($10M), 2. Windward Enterprises, LLC ($3.48M), 3. San-I-Pak Pacific, Inc. ($3.17M), 4. Argo Turboserve Corporation ($2.21M), 5. Allied Marine Services LLC ($1.91M), 6. Vantex Service Corporation ($1.67M), 7. Government of Canada ($1.58M), 8. Kampi Components Co Inc. ($1.54M), 9. ECI Defense Group, Inc. ($1.48M), 10. Fourinox, Inc. ($1.46M).

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