Top 100 Contractors in NAICS 56199: All Other Support Services, FY2023

Name: Top 100 Contractors in NAICS 56199: All Other Support Services, FY2023
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2022 – Sep 30, 2023 Code page on GovTribe

The top 10 won 85% of FY2023 NAICS 56199 contract dollars

Contract obligations: $3,562,102,026 Net of deobligations, by contracts coded NAICS 56199 or a code under it
Contractors: 924 Parent companies with an obligation
Largest contractor: RTX Corporation $1.94 billion, 52.7% 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	RTX Corporation 3 awardees, including Raytheon Company Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$1,942,220,003	52.7%	Rank history: not on the FY2021 list, #41 in FY2022 and not on the FY2024–FY2025 lists; up 40 since FY2022.
2	Lockheed Martin Corporation 4 awardees, including Sikorsky Aircraft Corporation Top agencies USSOCOM (United States Special Operations Command) USAF (Department of the Air Force) Army (Department of the Army)	$778,867,472	21.1%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #1 in FY2025; down 1 since FY2022.
3	General Dynamics Corporation 2 awardees, including General Dynamics Information Technology, Inc. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$123,134,286	3.3%	Rank history: #2 in FY2021, #2 in FY2022, #3 in FY2024 and #3 in FY2025; down 1 since FY2022.
4	CGI Technologies and Solutions Inc. Through CGI Federal Inc. Top agencies DOS (Department of State)	$63,942,751	1.7%	Rank history: #7 in FY2021, #5 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
5	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies DOE (Department of Energy) USAF (Department of the Air Force)	$58,473,916	1.6%	Rank history: #10 in FY2021, #3 in FY2022, #10 in FY2024 and #9 in FY2025; down 2 since FY2022.
6	Atkins Nuclear Secured Holdings Corporation 2 awardees, including Isotek Systems, LLC Top agencies DOE (Department of Energy)	$55,695,591	1.5%	Rank history: #4 in FY2021, #4 in FY2022, #5 in FY2024 and #4 in FY2025; down 2 since FY2022.
7	Sierra Nevada Company, LLC Top agencies USAF (Department of the Air Force)	$51,495,665	1.4%	Rank history: not on the FY2021 list, #6 in FY2022, #9 in FY2024 and #10 in FY2025; down 1 since FY2022.
8	The Chenega Corporation Through Chenega Global Protection, LLC Top agencies NASA (National Aeronautics and Space Administration)	$32,139,248	0.9%	Rank history: not on the FY2021 list, #12 in FY2022, #23 in FY2024 and not on the FY2025 list; up 4 since FY2022.
9	Trace, Inc. Top agencies DECA (Defense Commissary Agency)	$29,866,915	0.8%	Rank history: #12 in FY2021, #9 in FY2022, #6 in FY2024 and #6 in FY2025; unchanged since FY2022.
10	Pride Industries Top agencies DECA (Defense Commissary Agency)	$16,175,491	0.4%	Rank history: #14 in FY2021, #15 in FY2022, #16 in FY2024 and #13 in FY2025; up 5 since FY2022.
11	CW Group Inc Through CW Resources, Inc. Top agencies DECA (Defense Commissary Agency)	$14,350,541	0.4%	Rank history: #16 in FY2021, #11 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
12	Lamain Industries LLC Top agencies DECA (Defense Commissary Agency)	$14,050,737	0.4%	Rank history: #22 in FY2021, #23 in FY2022, #11 in FY2024 and #11 in FY2025; up 11 since FY2022.
13	Job Options, Incorporated Top agencies DECA (Defense Commissary Agency)	$11,794,162	0.3%	Rank history: #17 in FY2021, #17 in FY2022, #21 in FY2024 and #18 in FY2025; up 4 since FY2022.
14	Koniag, Inc. Through Pacarctic, LLC Top agencies DOJ (Department of Justice)	$11,664,973	0.3%	Rank history: #24 in FY2021, #34 in FY2022 and not on the FY2024–FY2025 lists; up 20 since FY2022.
15	Arcus Group, LLC Top agencies DHS (Department of Homeland Security)	$9,181,245	0.2%	Rank history: #37 in FY2021, #40 in FY2022, #8 in FY2024 and #7 in FY2025; up 25 since FY2022.
16	General Atomic Technologies Corporation Through General Atomics Aeronautical Systems, Inc. Top agencies USAF (Department of the Air Force)	$9,110,781	0.2%	Rank history: #11 in FY2021, #7 in FY2022, #28 in FY2024 and not on the FY2025 list; down 9 since FY2022.
17	Lumbee Tribe Enterprises LLC Top agencies DOS (Department of State)	$8,349,688	0.2%	Rank history: #6 in FY2021, #13 in FY2022, #50 in FY2024 and not on the FY2025 list; down 4 since FY2022.
18	Triple Canopy Inc. Through Centerra Group, LLC Top agencies USAF (Department of the Air Force) AOUSC (Administrative Office of the U.S. Courts)	$8,260,248	0.2%	Rank history: #15 in FY2021, #8 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
19	Tetra Tech, Inc. Through Management Systems International, Inc. Top agencies USAID (US Agency for International Development)	$8,113,123	0.2%	Rank history: not on the FY2021–FY2022 lists, #13 in FY2024 and not on the FY2025 list; new.
20	Communication Methods, LLC Top agencies DECA (Defense Commissary Agency)	$7,897,583	0.2%	Rank history: #28 in FY2021, #14 in FY2022, #18 in FY2024 and #14 in FY2025; down 6 since FY2022.
21	Echelon Services, LLC Top agencies DCSA (Defense Counterintelligence and Security Agency)	$7,879,669	0.2%	Rank history: not on the FY2021 list, #32 in FY2022, #29 in FY2024 and #25 in FY2025; up 11 since FY2022.
22	Dak Professional Services, LLC Top agencies DECA (Defense Commissary Agency)	$6,784,793	0.2%	Rank history: #30 in FY2021, #39 in FY2022, #35 in FY2024 and #68 in FY2025; up 17 since FY2022.
23	L L Brooks Enterprises Inc. Top agencies DECA (Defense Commissary Agency)	$6,754,053	0.2%	Rank history: #34 in FY2021, #47 in FY2022, #25 in FY2024 and #20 in FY2025; up 24 since FY2022.
24	IEM International, Inc. Top agencies Army (Department of the Army)	$6,209,987	0.2%	Rank history: #26 in FY2021, #21 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
25	Industries for the Blind and Visually Impaired, Inc. Top agencies Navy (Department of the Navy)	$6,017,802	0.2%	Rank history: not on the FY2021–FY2022 lists, #17 in FY2024 and #34 in FY2025; new.
26	C.j. Mahan Construction Company, LLC Top agencies Army (Department of the Army)	$5,850,000	0.2%	Rank history: not on the FY2021 list, #18 in FY2022, #32 in FY2024 and #23 in FY2025; down 8 since FY2022.
27	Brevard Achievement Center, Inc. Top agencies DECA (Defense Commissary Agency)	$5,761,383	0.2%	Rank history: #25 in FY2021, #31 in FY2022, #37 in FY2024 and #24 in FY2025; up 4 since FY2022.
28	W. Harris, Government Services Contractor, Inc. Top agencies DECA (Defense Commissary Agency)	$5,292,795	0.1%	Rank history: #49 in FY2021, #19 in FY2022, #30 in FY2024 and #21 in FY2025; down 9 since FY2022.
29	Great Plains Enterprises Inc. Top agencies DECA (Defense Commissary Agency)	$5,265,321	0.1%	Rank history: #35 in FY2021, #78 in FY2022, #73 in FY2024 and #55 in FY2025; up 49 since FY2022.
30	Galapagos Federal Systems LLC Top agencies USAF (Department of the Air Force)	$5,223,313	0.1%	Rank history: #42 in FY2021, #42 in FY2022, #22 in FY2024 and #28 in FY2025; up 12 since FY2022.
31	L3Harris Technologies, Inc. Through L3Harris Technologies Integrated Systems L.P. Top agencies USAF (Department of the Air Force)	$5,080,527	0.1%	Rank history: #31 in FY2021, #77 in FY2022 and not on the FY2024–FY2025 lists; up 46 since FY2022.
32	Virginian 32, Inc. Top agencies USAF (Department of the Air Force)	$5,045,224	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
33	Cgh-Global, LLC Through Cgh-Global Emergency Management Strategies LLC Top agencies USAF (Department of the Air Force)	$4,837,975	0.1%	Rank history: #43 in FY2021, #27 in FY2022, #34 in FY2024 and not on the FY2025 list; down 6 since FY2022.
34	Mcclellan Business Park LLC Top agencies DHS (Department of Homeland Security)	$4,617,693	0.1%	Rank history: not on the FY2021 list, #22 in FY2022, #36 in FY2024 and #35 in FY2025; down 12 since FY2022.
35	Dunlap Government Solutions, LLC Top agencies VA (Department of Veterans Affairs) DHA (Defense Health Agency) Army (Department of the Army)	$4,288,215	0.1%	Rank history: not on the FY2021 list, #29 in FY2022, #38 in FY2024 and #26 in FY2025; down 6 since FY2022.
36	Servtech Top agencies DECA (Defense Commissary Agency)	$4,037,781	0.1%	Rank history: #56 in FY2021, #35 in FY2022, #24 in FY2024 and #16 in FY2025; down 1 since FY2022.
37	Aspire Therapy Services and Consultants, Inc. Top agencies DECA (Defense Commissary Agency)	$3,840,608	0.1%	Rank history: #36 in FY2021, #62 in FY2022, #57 in FY2024 and #47 in FY2025; up 25 since FY2022.
38	Palmetto Goodwill Services Top agencies USAF (Department of the Air Force)	$3,638,546	0.1%	Rank history: #23 in FY2021, #20 in FY2022 and not on the FY2024–FY2025 lists; down 18 since FY2022.
39	Goldbelt Apex, LLC Top agencies Army (Department of the Army)	$3,537,105	0.1%	Rank history: not on the FY2021–FY2022 lists, #74 in FY2024 and #88 in FY2025; new.
40	21St Century Management Services, Inc. Top agencies DHA (Defense Health Agency)	$3,281,703	0.1%	Rank history: #33 in FY2021, #52 in FY2022 and not on the FY2024–FY2025 lists; up 12 since FY2022.
41	P&G Memorials LLC Top agencies VA (Department of Veterans Affairs)	$3,196,477	0.1%	Rank history: not on the FY2021–FY2022 lists, #59 in FY2024 and #49 in FY2025; up 60 since FY2022.
42	General Electric Company Top agencies Army (Department of the Army)	$3,102,816	0.1%	Rank history: #39 in FY2021, #33 in FY2022, #41 in FY2024 and #29 in FY2025; down 9 since FY2022.
43	Tanaq Support Services, LLC Top agencies HHS (Department of Health and Human Services)	$3,054,373	0.1%	Rank history: #5 in FY2021, #46 in FY2022, #84 in FY2024 and not on the FY2025 list; up 3 since FY2022.
44	Challenge Enterprises of North Florida, Inc. Top agencies DECA (Defense Commissary Agency)	$2,934,905	0.1%	Rank history: #47 in FY2021, not on the FY2022 list, #49 in FY2024 and #67 in FY2025; up 69 since FY2022.
45	R&R Commissary Services, Incorporated Top agencies DECA (Defense Commissary Agency)	$2,870,838	0.1%	Rank history: #32 in FY2021, #28 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
46	Team Henry Enterprises, LLC Top agencies Army (Department of the Army)	$2,849,454	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
47	Dependable On-Site Scan & Shred, Inc. Top agencies VA (Department of Veterans Affairs) ED (Department of Education) USAF (Department of the Air Force)	$2,735,408	0.1%	Rank history: #75 in FY2021, #56 in FY2022, #56 in FY2024 and #53 in FY2025; up 9 since FY2022.
48	Ponderful, LLC Top agencies DECA (Defense Commissary Agency)	$2,734,017	0.1%	Rank history: not on the FY2021 list, #63 in FY2022, #31 in FY2024 and #17 in FY2025; up 15 since FY2022.
49	Good Vocations, Inc. Top agencies DECA (Defense Commissary Agency)	$2,603,101	0.1%	Rank history: #70 in FY2021, #69 in FY2022, #51 in FY2024 and #36 in FY2025; up 20 since FY2022.
50	Claene Group LLC Top agencies Army (Department of the Army)	$2,409,499	0.1%	Rank history: not on the FY2021 list, #43 in FY2022, #60 in FY2024 and #50 in FY2025; down 7 since FY2022.
51	Sourceamerica Top agencies Treasury (Department of the Treasury)	$2,353,432	0.1%	Rank history: not on the FY2021 list, #26 in FY2022, #39 in FY2024 and #30 in FY2025; down 25 since FY2022.
52	Bayaud Enterprises, Inc. Top agencies VA (Department of Veterans Affairs) DOI (Department of the Interior)	$2,234,540	0.1%	Rank history: #57 in FY2021, #67 in FY2022 and not on the FY2024–FY2025 lists; up 15 since FY2022.
53	Downtown Business Improvement District Corp Top agencies GSA (General Services Administration)	$2,182,077	0.1%	Rank history: #52 in FY2021, #36 in FY2022, #65 in FY2024 and #57 in FY2025; down 17 since FY2022.
54	Goodwill Industries of Central Alabama, Inc. Top agencies DECA (Defense Commissary Agency)	$2,139,854	0.1%	Rank history: #44 in FY2021, #44 in FY2022, #44 in FY2024 and #37 in FY2025; down 10 since FY2022.
55	Challenge Unlimited, Inc. Top agencies DECA (Defense Commissary Agency)	$2,050,254	0.1%	Rank history: #53 in FY2021, #60 in FY2022, #55 in FY2024 and #32 in FY2025; up 5 since FY2022.
56	STS Government Solutions, LLC Top agencies USAF (Department of the Air Force)	$2,008,309	0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2024 and #64 in FY2025; new.
57	Millennium Health & Fitness, Inc. Top agencies WHS (DOD Washington Headquarters Service)	$1,920,752	0.1%	Rank history: #65 in FY2021, #57 in FY2022, #72 in FY2024 and #60 in FY2025; unchanged since FY2022.
58	LEO Tech LLC Top agencies USAF (Department of the Air Force)	$1,908,104	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
59	Nysarc Inc. Top agencies Army (Department of the Army)	$1,840,685	<0.1%	Rank history: #58 in FY2021, #49 in FY2022 and not on the FY2024–FY2025 lists; down 10 since FY2022.
60	Inventory Auditors International LLC Top agencies DECA (Defense Commissary Agency)	$1,824,629	<0.1%	Rank history: not on the FY2021–FY2022 lists, #71 in FY2024 and not on the FY2025 list; up 85 since FY2022.
61	Imax Service Corp Top agencies DECA (Defense Commissary Agency)	$1,796,926	<0.1%	Rank history: #81 in FY2021, #74 in FY2022 and not on the FY2024–FY2025 lists; up 13 since FY2022.
62	Peninsula Services Top agencies DECA (Defense Commissary Agency) Navy (Department of the Navy)	$1,700,261	<0.1%	Rank history: #69 in FY2021, #55 in FY2022 and not on the FY2024–FY2025 lists; down 7 since FY2022.
63	Consolidated Support Services, Inc. Top agencies DECA (Defense Commissary Agency)	$1,692,512	<0.1%	Rank history: #41 in FY2021, #76 in FY2022, #88 in FY2024 and #46 in FY2025; up 13 since FY2022.
64	Gulf Coast Wilbert Inc. Top agencies VA (Department of Veterans Affairs)	$1,689,695	<0.1%	Rank history: not on the FY2021 list, #70 in FY2022, #78 in FY2024 and #76 in FY2025; up 6 since FY2022.
65	Stericycle Inc. 5 awardees Top agencies VA (Department of Veterans Affairs) SSA (Social Security Administration) NLRB (National Labor Relations Board)	$1,629,110	<0.1%	Rank history: #64 in FY2021, #64 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
66	Elyon International, Inc. Top agencies USDA (Department of Agriculture)	$1,606,539	<0.1%	Rank history: #82 in FY2021, #65 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
67	Retail Services WIS Corporation Top agencies DECA (Defense Commissary Agency)	$1,584,405	<0.1%	Rank history: not on the FY2021 list, #82 in FY2022, #97 in FY2024 and not on the FY2025 list; up 15 since FY2022.
68	Pinter Memorials Inc. Top agencies VA (Department of Veterans Affairs)	$1,516,552	<0.1%	Rank history: not on the FY2021 list, #79 in FY2022, not on the FY2024 list and #66 in FY2025; up 11 since FY2022.
69	Coastal Enterprises of Jacksonville Inc. Top agencies DECA (Defense Commissary Agency)	$1,478,820	<0.1%	Rank history: #94 in FY2021, not on the FY2022 list, #79 in FY2024 and #69 in FY2025; up 61 since FY2022.
70	Macrosys, LLC Top agencies DOT (Department of Transportation)	$1,461,350	<0.1%	Rank history: not on the FY2021 list, #80 in FY2022, #68 in FY2024 and #97 in FY2025; up 10 since FY2022.
71	The Right 2 Work Corporation Top agencies DECA (Defense Commissary Agency)	$1,459,980	<0.1%	Rank history: #48 in FY2021, #58 in FY2022, #48 in FY2024 and #39 in FY2025; down 13 since FY2022.
72	Network Enterprises Inc. Top agencies DECA (Defense Commissary Agency)	$1,448,730	<0.1%	Rank history: not on the FY2021 list, #71 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
73	D7, LLC Top agencies DOJ (Department of Justice)	$1,431,759	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 34 since FY2022.
74	Omniplex World Services Corp Through Triple Canopy Inc. Top agencies Navy (Department of the Navy)	$1,421,888	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
75	Assets Inc. Top agencies DECA (Defense Commissary Agency)	$1,415,450	<0.1%	Rank history: #68 in FY2021, #51 in FY2022, #80 in FY2024 and #71 in FY2025; down 24 since FY2022.
76	Narongsak Marican & Son Limited Partnership Top agencies Army (Department of the Army)	$1,408,283	<0.1%	Rank history: not on the FY2021 list, #75 in FY2022, not on the FY2024 list and #94 in FY2025; down 1 since FY2022.
77	Southwest Business Improvement District Top agencies GSA (General Services Administration)	$1,405,343	<0.1%	Rank history: not on the FY2021 list, #89 in FY2022, #87 in FY2024 and #79 in FY2025; up 12 since FY2022.
78	City of Murfreesboro Top agencies VA (Department of Veterans Affairs)	$1,393,942	<0.1%	Rank history: #89 in FY2021, #73 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
79	Checkmate Global, LLC Top agencies DHS (Department of Homeland Security)	$1,353,400	<0.1%	Rank history: #13 in FY2021, not on the FY2022 list, #12 in FY2024 and #54 in FY2025; returned.
80	Standing Rock Sioux Tribe Top agencies HHS (Department of Health and Human Services)	$1,291,178	<0.1%	Rank history: not on the FY2021 list, #96 in FY2022 and not on the FY2024–FY2025 lists; up 16 since FY2022.
81	County Services Inc. Top agencies USDA (Department of Agriculture)	$1,265,900	<0.1%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2024 and #85 in FY2025; up 22 since FY2022.
82	Logistical Customer Service, Inc. Top agencies DECA (Defense Commissary Agency)	$1,229,243	<0.1%	Rank history: #63 in FY2021, not on the FY2022 list, #46 in FY2024 and #41 in FY2025; up 73 since FY2022.
83	Hope of the Valley Rescue Mission Through Hope the Mission Top agencies VA (Department of Veterans Affairs)	$1,195,212	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
84	Black Hills Works Inc. Top agencies DECA (Defense Commissary Agency)	$1,182,040	<0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2024 and #72 in FY2025; new.
85	Archway Solutions Limited Liability Company Top agencies Army (Department of the Army)	$1,181,436	<0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #73 in FY2025; up 35 since FY2022.
86	Ogata Kogyo Ltd. Top agencies Navy (Department of the Navy)	$1,163,466	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 87 since FY2022.
87	Po`okela Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$1,154,614	<0.1%	Rank history: not on the FY2021 list, #87 in FY2022, #92 in FY2024 and not on the FY2025 list; unchanged since FY2022.
88	Beacon Top agencies DECA (Defense Commissary Agency)	$1,152,880	<0.1%	Rank history: not on the FY2021 list, #84 in FY2022, not on the FY2024 list and #75 in FY2025; down 4 since FY2022.
89	Casillas LLC Top agencies DECA (Defense Commissary Agency)	$1,147,195	<0.1%	Rank history: not on the FY2021–FY2022 lists, #42 in FY2024 and #27 in FY2025; up 77 since FY2022.
90	New Leaf, Inc. Top agencies DECA (Defense Commissary Agency)	$1,139,483	<0.1%	Rank history: #60 in FY2021, #85 in FY2022, not on the FY2024 list and #95 in FY2025; down 5 since FY2022.
91	Caitta Inc Top agencies HHS (Department of Health and Human Services)	$1,139,370	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
92	Perkins & Associates LLC Top agencies DECA (Defense Commissary Agency)	$1,122,757	<0.1%	Rank history: not on the FY2021–FY2022 lists, #99 in FY2024 and #81 in FY2025; up 113 since FY2022.
93	Fairbanks Resource Agency, Inc. Top agencies DECA (Defense Commissary Agency)	$1,111,183	<0.1%	Rank history: #77 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 36 since FY2022.
94	Work Services Corporation Top agencies DECA (Defense Commissary Agency) USAF (Department of the Air Force)	$1,092,426	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 43 since FY2022.
95	W. & O. Supply Inc. Through The Hiller Companies LLC Top agencies Navy (Department of the Navy)	$1,085,567	<0.1%	Rank history: #92 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 84 since FY2022.
96	Skadden Arps Slate Meagher & Flom LLP Top agencies DOE (Department of Energy)	$1,084,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
97	Cubic Digital Intelligence Inc. Through Cubic Defense Applications, Inc. Top agencies USAF (Department of the Air Force)	$1,083,180	<0.1%	Rank history: not on the FY2021 list, #30 in FY2022 and not on the FY2024–FY2025 lists; down 67 since FY2022.
98	Plurax LLC Top agencies DECA (Defense Commissary Agency)	$1,062,742	<0.1%	Rank history: not on the FY2021 list, #99 in FY2022, #93 in FY2024 and #70 in FY2025; up 1 since FY2022.
99	National Hose Testing Specialties Inc. Top agencies USDA (Department of Agriculture)	$1,050,875	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
100	I Tech AG LLC Top agencies Treasury (Department of the Treasury)	$1,039,737	<0.1%	Rank history: #95 in FY2021, #93 in FY2022, #98 in FY2024 and not on the FY2025 list; down 7 since FY2022.

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100 of 924 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 56199

Code	Net obligations	Largest contractor
561990 All Other Support Services	$3,562,102,026	RTX Corporation

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 $3.69 billion 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 2023 ran Oct 1, 2022 – Sep 30, 2023. 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 FY2022. "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 FY2022 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 56199 contractors in FY2023?

1. RTX Corporation ($1.94B), 2. Lockheed Martin Corporation ($779M), 3. General Dynamics Corporation ($123M), 4. CGI Technologies and Solutions Inc. ($63.9M), 5. Booz Allen Hamilton Holding Corporation ($58.5M), 6. Atkins Nuclear Secured Holdings Corporation ($55.7M), 7. Sierra Nevada Company, LLC ($51.5M), 8. The Chenega Corporation ($32.1M), 9. Trace, Inc. ($29.9M), 10. Pride Industries ($16.2M).

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