Top 100 Contractors in PSC 4520: Space and Water Heating Equipment, Aug 2025–Jul 2026

Name: Top 100 Contractors in PSC 4520: Space and Water Heating Equipment, Aug 2025–Jul 2026
Creator: GovTribe
License: https://creativecommons.org/licenses/by/4.0/

Parent companies by net contract obligations Aug 1, 2025 – Jul 31, 2026 Code page on GovTribe

The latest 12 months. See the newest fiscal year's list: Top Contractors in PSC 4520: Space and Water Heating Equipment, FY2025.

The top 10 won 63% of PSC 4520 contract dollars from August 2025 through July 2026

Contract obligations: $49,982,077 Net of deobligations, by contracts coded PSC 4520
Contractors: 232 Parent companies with an obligation
Largest contractor: HDT Expeditionary Systems Inc. $10.7 million, 20.2% of obligations
Data as of: Nov 5, 2026

Contract actions from FPDS (SAM.gov). How the rankings work · Download all 100 rows as CSV · Free to reuse with credit to GovTribe (CC BY 4.0)

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	HDT Expeditionary Systems Inc. Top agencies Army (Department of the Army)	$10,679,500	20.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
2	Atlantic Diving Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$3,685,690	7.0%	Rank history: not on the FY2021–FY2024 lists and #47 in FY2025; up 42 since Aug 2024–Jul 2025.
3	Lockheed Martin Corporation 2 awardees, including Sikorsky Aircraft Corporation and Derco Aerospace, Inc. Top agencies DLA (Defense Logistics Agency)	$3,389,480	6.4%	Rank history: #13 in FY2021, #9 in FY2022, #6 in FY2023, #2 in FY2024 and #1 in FY2025; up 2 since Aug 2024–Jul 2025.
4	Argo Turboserve Corporation Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$3,270,094	6.2%	Rank history: #2 in FY2021, #3 in FY2022, #3 in FY2023, #3 in FY2024 and #3 in FY2025; down 1 since Aug 2024–Jul 2025.
5	Windward Enterprises, LLC Top agencies DLA (Defense Logistics Agency)	$2,696,825	5.1%	Rank history: #1 in FY2021, #1 in FY2022, #2 in FY2023, #1 in FY2024 and #2 in FY2025; down 4 since Aug 2024–Jul 2025.
6	The Electric Heater Co Top agencies DLA (Defense Logistics Agency) DHS (Department of Homeland Security) Navy (Department of the Navy)	$2,365,602	4.5%	Rank history: #9 in FY2021, #6 in FY2022, #4 in FY2023, #30 in FY2024 and #5 in FY2025; down 2 since Aug 2024–Jul 2025.
7	Heico Corp Through Pioneer Industries, LLC Top agencies DLA (Defense Logistics Agency)	$2,224,889	4.2%	Rank history: not on the FY2021–FY2024 lists and #7 in FY2025; new, not ranked in Aug 2024–Jul 2025.
8	S I T Corporation Top agencies DLA (Defense Logistics Agency)	$1,983,924	3.7%	Rank history: #30 in FY2021, #47 in FY2022, #83 in FY2023, #38 in FY2024 and #9 in FY2025; up 14 since Aug 2024–Jul 2025.
9	Integrated Procurement Technologies Top agencies DLA (Defense Logistics Agency)	$1,671,823	3.2%	Rank history: #29 in FY2021, not on the FY2022–FY2024 lists and #8 in FY2025; new, not ranked in Aug 2024–Jul 2025.
10	MCO Solutions, Inc. Top agencies DLA (Defense Logistics Agency)	$1,467,592	2.8%	Rank history: #54 in FY2021, #15 in FY2022, #10 in FY2023, #17 in FY2024 and #22 in FY2025; down 1 since Aug 2024–Jul 2025.
11	Veterans Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$954,120	1.8%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
12	Leonardo S.p.A. Through Engineered Coil Company Top agencies DLA (Defense Logistics Agency)	$746,129	1.4%	Rank history: #33 in FY2021, not on the FY2022–FY2023 lists, #15 in FY2024 and #18 in FY2025; down 1 since Aug 2024–Jul 2025.
13	Kampi Components Co Inc. Top agencies DLA (Defense Logistics Agency)	$729,254	1.4%	Rank history: #4 in FY2021, #7 in FY2022, #5 in FY2023, #7 in FY2024 and #11 in FY2025; down 5 since Aug 2024–Jul 2025.
14	Linmarr Associates, Inc. Top agencies DLA (Defense Logistics Agency) Navy (Department of the Navy)	$693,435	1.3%	Rank history: not on the FY2021–FY2024 lists and #28 in FY2025; up 200 since Aug 2024–Jul 2025.
15	Auburn Mechanical, Inc. Top agencies Navy (Department of the Navy)	$538,900	1.0%	Rank history: not on the FY2021–FY2024 lists and #12 in FY2025; new, not ranked in Aug 2024–Jul 2025.
16	RNK International, Inc. Top agencies DLA (Defense Logistics Agency) USAF (Department of the Air Force) DOS (Department of State)	$498,461	0.9%	Rank history: #42 in FY2021, #79 in FY2022, #19 in FY2023, #33 in FY2024 and #19 in FY2025; up 2 since Aug 2024–Jul 2025.
17	Blue Group LLC Top agencies DLA (Defense Logistics Agency)	$482,930	0.9%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
18	Teya Diversified Services LLC Top agencies USAF (Department of the Air Force)	$465,810	0.9%	Rank history: not on the FY2021–FY2024 lists and #17 in FY2025; new, not ranked in Aug 2024–Jul 2025.
19	Water Heater Distributors, LLC Top agencies DOJ (Department of Justice)	$415,538	0.8%	Rank history: not on the FY2021–FY2022 lists, #44 in FY2023, #40 in FY2024 and #94 in FY2025; up 26 since Aug 2024–Jul 2025.
20	Samit LLC Top agencies DLA (Defense Logistics Agency)	$403,117	0.8%	Rank history: not on the FY2021–FY2022 lists, #53 in FY2023, not on the FY2024 list and #75 in FY2025; up 54 since Aug 2024–Jul 2025.
21	Cepeda Associates, Inc. Top agencies DLA (Defense Logistics Agency)	$380,066	0.7%	Rank history: #96 in FY2021, not on the FY2022 list, #90 in FY2023, #61 in FY2024 and #40 in FY2025; up 34 since Aug 2024–Jul 2025.
22	R & M Government Services Inc. Top agencies DLA (Defense Logistics Agency)	$369,938	0.7%	Rank history: not on the FY2021–FY2022 lists, #52 in FY2023, #16 in FY2024 and #6 in FY2025; down 16 since Aug 2024–Jul 2025.
23	S & K Aerospace, LLC Top agencies USAF (Department of the Air Force)	$363,452	0.7%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
24	FBC Enterprises LLC Top agencies DLA (Defense Logistics Agency)	$341,605	0.6%	Rank history: not on the FY2021–FY2024 lists and #26 in FY2025; new, not ranked in Aug 2024–Jul 2025.
25	Larkos Packing and Distribution Inc. Top agencies DLA (Defense Logistics Agency)	$339,742	0.6%	Rank history: #90 in FY2021, #56 in FY2022, #37 in FY2023, #13 in FY2024 and #23 in FY2025; down 1 since Aug 2024–Jul 2025.
26	Jgils, LLC Top agencies DLA (Defense Logistics Agency)	$330,195	0.6%	Rank history: #59 in FY2021, #72 in FY2022, #26 in FY2023, #18 in FY2024 and #50 in FY2025; up 133 since Aug 2024–Jul 2025.
27	Valad Electric Heating Corp. Top agencies DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$329,769	0.6%	Rank history: #34 in FY2021, #29 in FY2022, #65 in FY2023, #21 in FY2024 and #34 in FY2025; up 1 since Aug 2024–Jul 2025.
28	Ferguson Enterprises LLC Top agencies DOJ (Department of Justice) DOI (Department of the Interior)	$312,019	0.6%	Rank history: not on the FY2021–FY2025 lists; up 122 since Aug 2024–Jul 2025.
29	ETP Procurement LLC Top agencies DLA (Defense Logistics Agency)	$274,140	0.5%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
30	Douglas Food Stores Inc. Top agencies DLA (Defense Logistics Agency)	$240,380	0.5%	Rank history: #69 in FY2021, #57 in FY2022, not on the FY2023 list, #51 in FY2024 and #78 in FY2025; up 45 since Aug 2024–Jul 2025.
31	Active Gear Company of Canada Limited Top agencies DLA (Defense Logistics Agency)	$236,841	0.4%	Rank history: #61 in FY2021, #63 in FY2022, #39 in FY2023, #87 in FY2024 and #59 in FY2025; up 64 since Aug 2024–Jul 2025.
32	Power Plus International, Inc. Top agencies DOJ (Department of Justice) USDA (Department of Agriculture)	$227,588	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
33	Seahorse Defense Supply, LLC Top agencies DLA (Defense Logistics Agency)	$220,385	0.4%	Rank history: #60 in FY2021 and not on the FY2022–FY2025 lists; up 92 since Aug 2024–Jul 2025.
34	Westsim Engineering, Inc. Top agencies DLA (Defense Logistics Agency)	$217,935	0.4%	Rank history: #39 in FY2021, #28 in FY2022, #51 in FY2023, #55 in FY2024 and #31 in FY2025; up 5 since Aug 2024–Jul 2025.
35	J.G.B. Enterprises Inc. Through Echelon Supply and Service, Inc. Top agencies DLA (Defense Logistics Agency)	$217,913	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
36	Tera Consulting Inc. Top agencies Army (Department of the Army)	$205,941	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
37	JEM Engineering Solutions Top agencies USAF (Department of the Air Force)	$202,923	0.4%	Rank history: not on the FY2021–FY2024 lists and #33 in FY2025; new, not ranked in Aug 2024–Jul 2025.
38	United Precision Corporation Top agencies Navy (Department of the Navy)	$198,675	0.4%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
39	Kijero, LLC Top agencies Navy (Department of the Navy)	$190,300	0.4%	Rank history: not on the FY2021–FY2025 lists; up 103 since Aug 2024–Jul 2025.
40	ECI Defense Group, Inc. Top agencies DLA (Defense Logistics Agency)	$181,142	0.3%	Rank history: #73 in FY2021, not on the FY2022–FY2023 lists, #37 in FY2024 and #93 in FY2025; up 48 since Aug 2024–Jul 2025.
41	Steel LLC Top agencies USDA (Department of Agriculture)	$176,504	0.3%	Rank history: not on the FY2021–FY2024 lists and #38 in FY2025; new, not ranked in Aug 2024–Jul 2025.
42	Monmouth Solutions, Inc. Top agencies Navy (Department of the Navy)	$158,618	0.3%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
43	Phoenix Trading Inc. Top agencies DLA (Defense Logistics Agency)	$156,280	0.3%	Rank history: not on the FY2021–FY2023 lists, #49 in FY2024 and #21 in FY2025; down 24 since Aug 2024–Jul 2025.
44	Govparts LLC Top agencies DLA (Defense Logistics Agency)	$154,546	0.3%	Rank history: not on the FY2021–FY2023 lists, #59 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
45	Selas Heat Technology Company LLC Top agencies DHS (Department of Homeland Security)	$150,602	0.3%	Rank history: not on the FY2021–FY2023 lists, #23 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
46	Frawner Corporation Top agencies USAF (Department of the Air Force)	$145,000	0.3%	Rank history: not on the FY2021–FY2024 lists and #43 in FY2025; new, not ranked in Aug 2024–Jul 2025.
47	Aspeq Heating Group LLC Through Indeeco LLC Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security) DLA (Defense Logistics Agency)	$143,941	0.3%	Rank history: #19 in FY2021, #43 in FY2022, #38 in FY2023, #11 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.
48	Dietary Equipment Incorporated Top agencies DLA (Defense Logistics Agency)	$124,110	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
49	Parliament LLC Top agencies USAF (Department of the Air Force)	$121,000	0.2%	Rank history: not on the FY2021–FY2024 lists and #49 in FY2025; new, not ranked in Aug 2024–Jul 2025.
50	Premier & Companies, Inc. Top agencies DOJ (Department of Justice)	$116,147	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
51	Taza Supplies Inc. Top agencies DOJ (Department of Justice)	$114,480	0.2%	Rank history: not on the FY2021–FY2024 lists and #37 in FY2025; down 14 since Aug 2024–Jul 2025.
52	Dunbar Mechanical Contractors, LLC Top agencies VA (Department of Veterans Affairs)	$111,854	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
53	Waterbury Plumbing & Heating Supply, Inc. Top agencies DLA (Defense Logistics Agency)	$111,650	0.2%	Rank history: #32 in FY2021, not on the FY2022 list, #82 in FY2023, #65 in FY2024 and #51 in FY2025; down 7 since Aug 2024–Jul 2025.
54	Juniper Elbow Co. Inc. Top agencies Navy (Department of the Navy) DLA (Defense Logistics Agency)	$109,948	0.2%	Rank history: not on the FY2021 list, #45 in FY2022, not on the FY2023–FY2024 lists and #60 in FY2025; up 132 since Aug 2024–Jul 2025.
55	AMZ Alabama Inc. Top agencies DLA (Defense Logistics Agency)	$109,820	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
56	Robco Sales Inc. Top agencies VA (Department of Veterans Affairs)	$105,834	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
57	2Lyons Aerospace LLC Top agencies DLA (Defense Logistics Agency)	$103,970	0.2%	Rank history: not on the FY2021–FY2022 lists, #27 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
58	TECH Service Solutions LLC Top agencies VA (Department of Veterans Affairs)	$99,183	0.2%	Rank history: not on the FY2021–FY2025 lists; up 48 since Aug 2024–Jul 2025.
59	Ray Blackman Enterprises, Inc. Top agencies DLA (Defense Logistics Agency)	$94,250	0.2%	Rank history: not on the FY2021–FY2022 lists, #67 in FY2023, not on the FY2024 list and #35 in FY2025; new, not ranked in Aug 2024–Jul 2025.
60	EOS Inc. Top agencies DLA (Defense Logistics Agency)	$93,408	0.2%	Rank history: not on the FY2021–FY2024 lists and #76 in FY2025; up 117 since Aug 2024–Jul 2025.
61	Caprice Electronics, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$88,843	0.2%	Rank history: not on the FY2021–FY2022 lists, #80 in FY2023, not on the FY2024 list and #45 in FY2025; up 44 since Aug 2024–Jul 2025.
62	Southern Automotive Wholesalers, Inc. Top agencies DLA (Defense Logistics Agency)	$87,915	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
63	Jnorg LLC Top agencies VA (Department of Veterans Affairs)	$85,316	0.2%	Rank history: not on the FY2021–FY2024 lists and #69 in FY2025; up 4 since Aug 2024–Jul 2025.
64	Gaudin Equipment & Supply Co Top agencies VA (Department of Veterans Affairs)	$80,707	0.2%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
65	Arctic Slope Regional Corporation Through Asrc Federal Facilities Logistics, LLC Top agencies DLA (Defense Logistics Agency)	$78,860	0.1%	Rank history: not on the FY2021–FY2023 lists, #44 in FY2024 and #64 in FY2025; down 3 since Aug 2024–Jul 2025.
66	International Thermal Research Ltd Top agencies DLA (Defense Logistics Agency)	$77,075	0.1%	Rank history: #15 in FY2021, #5 in FY2022, #18 in FY2023, #12 in FY2024 and #32 in FY2025; down 41 since Aug 2024–Jul 2025.
67	Cooney Coil & Energy, LLC Top agencies VA (Department of Veterans Affairs)	$75,745	0.1%	Rank history: not on the FY2021–FY2024 lists and #73 in FY2025; new, not ranked in Aug 2024–Jul 2025.
68	CM Placid LLC Top agencies USAF (Department of the Air Force)	$75,425	0.1%	Rank history: not on the FY2021–FY2024 lists and #74 in FY2025; new, not ranked in Aug 2024–Jul 2025.
69	Commercial Parts & Service of Columbus, Ohio, Inc. Top agencies DLA (Defense Logistics Agency)	$73,401	0.1%	Rank history: #25 in FY2021, #24 in FY2022, #29 in FY2023, #84 in FY2024 and not on the FY2025 list; up 118 since Aug 2024–Jul 2025.
70	Sogen Company, Inc. Top agencies DLA (Defense Logistics Agency)	$72,588	0.1%	Rank history: #40 in FY2021, not on the FY2022 list, #64 in FY2023, not on the FY2024 list and #79 in FY2025; up 120 since Aug 2024–Jul 2025.
71	Veterans Plus LLC Top agencies DLA (Defense Logistics Agency)	$70,205	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
72	K5 Defense LLC Top agencies Commerce (Department of Commerce)	$70,080	0.1%	Rank history: not on the FY2021–FY2022 lists, #68 in FY2023, #14 in FY2024 and #42 in FY2025; down 56 since Aug 2024–Jul 2025.
73	Cold LLC Top agencies DLA (Defense Logistics Agency)	$68,000	0.1%	Rank history: not on the FY2021–FY2023 lists, #68 in FY2024 and #29 in FY2025; down 47 since Aug 2024–Jul 2025.
74	Morgan Ingland LLC Top agencies USAF (Department of the Air Force)	$65,678	0.1%	Rank history: not on the FY2021–FY2025 lists; up 44 since Aug 2024–Jul 2025.
75	Northern Defense Industries LLC Top agencies DLA (Defense Logistics Agency)	$63,756	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
76	The Roberts Mechanical Equipment Company Top agencies VA (Department of Veterans Affairs)	$59,360	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
77	Aantilia LLC Top agencies Army (Department of the Army) DOI (Department of the Interior) Commerce (Department of Commerce)	$58,260	0.1%	Rank history: #68 in FY2021, #20 in FY2022, not on the FY2023 list, #56 in FY2024 and not on the FY2025 list; up 131 since Aug 2024–Jul 2025.
78	Coleman Construction, Inc. Top agencies DOJ (Department of Justice)	$57,157	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
79	IC Pro Americas Inc. Top agencies DLA (Defense Logistics Agency)	$57,120	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
80	Robertson Manufacturing Inc. Top agencies DLA (Defense Logistics Agency)	$56,266	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
81	Aqua Logic, Inc. Top agencies DOI (Department of the Interior)	$52,008	0.1%	Rank history: not on the FY2021–FY2023 lists, #83 in FY2024 and #83 in FY2025; up 13 since Aug 2024–Jul 2025.
82	TNL Sales LLC Top agencies DLA (Defense Logistics Agency)	$50,838	0.1%	Rank history: #76 in FY2021, #17 in FY2022, not on the FY2023 list, #57 in FY2024 and not on the FY2025 list; up 136 since Aug 2024–Jul 2025.
83	Lentros Engineering, Inc. Top agencies Army (Department of the Army)	$50,304	0.1%	Rank history: not on the FY2021 list, #42 in FY2022, not on the FY2023–FY2024 lists and #90 in FY2025; new, not ranked in Aug 2024–Jul 2025.
84	Akatake Co.,Ltd. Top agencies Navy (Department of the Navy)	$49,514	0.1%	Rank history: not on the FY2021–FY2024 lists and #92 in FY2025; new, not ranked in Aug 2024–Jul 2025.
85	Johnson & Towers LLC Top agencies DLA (Defense Logistics Agency)	$48,147	0.1%	Rank history: not on the FY2021–FY2025 lists; up 50 since Aug 2024–Jul 2025.
86	TJR Procurement, LLC Top agencies DLA (Defense Logistics Agency)	$47,235	0.1%	Rank history: not on the FY2021–FY2024 lists and #54 in FY2025; down 44 since Aug 2024–Jul 2025.
87	Redfort Technologies LLC Top agencies DOJ (Department of Justice)	$46,000	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
88	Blue Heron Tactical Supply LLC Top agencies USAF (Department of the Air Force)	$45,450	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
89	Heat Wagons Inc. Top agencies DLA (Defense Logistics Agency)	$44,790	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
90	Lippe Federal, LLC Top agencies DOJ (Department of Justice)	$44,759	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
91	Siemens Corporation Through Siemens Medical Solutions Usa, Inc. Top agencies VA (Department of Veterans Affairs)	$44,605	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
92	Chase Supply, Inc. Top agencies Navy (Department of the Navy)	$44,497	0.1%	Rank history: not on the FY2021 list, #46 in FY2022 and not on the FY2023–FY2025 lists; up 12 since Aug 2024–Jul 2025.
93	Triman Industries Inc. Top agencies DLA (Defense Logistics Agency)	$43,229	0.1%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2023, #75 in FY2024 and not on the FY2025 list; up 34 since Aug 2024–Jul 2025.
94	NGH Retail LLC Top agencies DLA (Defense Logistics Agency)	$43,066	0.1%	Rank history: #6 in FY2021, #74 in FY2022 and not on the FY2023–FY2025 lists; up 50 since Aug 2024–Jul 2025.
95	Edwards International LLC Top agencies DLA (Defense Logistics Agency)	$41,565	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
96	Johnson Controls Federal Systems, LLC Through Johnson Controls Navy Systems, LLC Top agencies DLA (Defense Logistics Agency)	$39,942	0.1%	Rank history: not on the FY2021–FY2024 lists and #56 in FY2025; new, not ranked in Aug 2024–Jul 2025.
97	Russ Equipment Co., Incorporated Top agencies DHS (Department of Homeland Security)	$38,640	0.1%	Rank history: not on the FY2021–FY2025 lists; up 2 since Aug 2024–Jul 2025.
98	Bradley-Thompson Tool Company Top agencies DLA (Defense Logistics Agency)	$37,850	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
99	Pride Electronics Inc. Top agencies DLA (Defense Logistics Agency)	$37,470	0.1%	Rank history: not on the FY2021–FY2025 lists; new, not ranked in Aug 2024–Jul 2025.
100	J.b. Nottingham & Co Inc. Top agencies Navy (Department of the Navy)	$36,890	0.1%	Rank history: not on the FY2021–FY2023 lists, #46 in FY2024 and not on the FY2025 list; new, not ranked in Aug 2024–Jul 2025.

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100 of 232 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 $53 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. An awardee whose own actions mostly name no parent, and that no other company's actions name as their parent, rolls up its SAM.gov registration's chain of parent companies: it counts under the first company there that other companies' actions name as their parent, or under the parent most of a company's own actions name, whichever comes first; with neither, under the highest company in the chain with federal contracts of its own. Joint ventures stay companies of their own. 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.
Period: the trailing 12 months end with the last month that ended at least 90 days ago, because the Department of Defense reports its contract actions to FPDS about 90 days late. The list is rebuilt each night.
Rank changes compare with Aug 2024–Jul 2025. "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.
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 4520 contractors in Aug 2025–Jul 2026?

1. HDT Expeditionary Systems Inc. ($10.7M), 2. Atlantic Diving Supply, Inc. ($3.69M), 3. Lockheed Martin Corporation ($3.39M), 4. Argo Turboserve Corporation ($3.27M), 5. Windward Enterprises, LLC ($2.7M), 6. The Electric Heater Co ($2.37M), 7. Heico Corp ($2.22M), 8. S I T Corporation ($1.98M), 9. Integrated Procurement Technologies ($1.67M), 10. MCO Solutions, Inc. ($1.47M).

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