Top 100 Contractors in NAICS 561499: All Other Business Support Services, FY2023

Name: Top 100 Contractors in NAICS 561499: All Other Business 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 83% of FY2023 NAICS 561499 contract dollars

Contract obligations: $485,523,083 Net of deobligations, by contracts coded NAICS 561499
Contractors: 227 Parent companies with an obligation
Largest contractor: Fedex Corp $293 million, 58.8% 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	Fedex Corp Through Fedex Supply Chain Distribution System, Inc. Top agencies VA (Department of Veterans Affairs) DOJ (Department of Justice)	$292,660,865	58.8%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	Pitney Bowes Inc. 3 awardees, including Pitney Bowes Global Financial Services LLC Top agencies SSA (Social Security Administration) USDA (Department of Agriculture) Navy (Department of the Navy)	$36,309,438	7.3%	Rank history: #14 in FY2021, #4 in FY2022, #2 in FY2024 and #2 in FY2025; up 2 since FY2022.
3	Servicesource Inc. Top agencies Treasury (Department of the Treasury) DOE (Department of Energy) EPA (Environmental Protection Agency)	$22,573,570	4.5%	Rank history: #2 in FY2021, #2 in FY2022, #3 in FY2024 and #3 in FY2025; down 1 since FY2022.
4	Goodwill Industries of San Antonio Contract Services Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$19,607,579	3.9%	Rank history: #3 in FY2021, #3 in FY2022, #4 in FY2024 and #4 in FY2025; down 1 since FY2022.
5	Cyberstar LLC Top agencies DOE (Department of Energy)	$9,518,852	1.9%	Rank history: not on the FY2021 list, #8 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
6	Conduent Federal Solutions LLC Top agencies SSA (Social Security Administration) Treasury (Department of the Treasury)	$9,052,237	1.8%	Rank history: #4 in FY2021, #6 in FY2022, #6 in FY2024 and not on the FY2025 list; unchanged since FY2022.
7	Peckham Vocational Industries, Inc. Top agencies DLA (Defense Logistics Agency)	$7,625,174	1.5%	Rank history: #5 in FY2021, #5 in FY2022, #5 in FY2024 and not on the FY2025 list; down 2 since FY2022.
8	The Chenega Corporation Through Chenega Analytic Business Solutions, LLC Top agencies Navy (Department of the Navy)	$5,330,660	1.1%	Rank history: #19 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; up 10 since FY2022.
9	United Systems of Arkansas, Inc. Top agencies HHS (Department of Health and Human Services) USDA (Department of Agriculture)	$4,781,193	1.0%	Rank history: #8 in FY2021, #10 in FY2022, #11 in FY2024 and #20 in FY2025; up 1 since FY2022.
10	CACI International Inc. Through Caci, LLC - Commercial Top agencies CFTC (Commodity Futures Trading Commission) DOJ (Department of Justice)	$4,079,933	0.8%	Rank history: #6 in FY2021, #9 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
11	Tetra Tech, Inc. 2 awardees, including Ard, Inc. and The Kaizen Company, LLC Top agencies USAID (US Agency for International Development)	$4,040,000	0.8%	Rank history: not on the FY2021 list, #7 in FY2022, #8 in FY2024 and #28 in FY2025; down 4 since FY2022.
12	Keystone Vocational Services Inc. Top agencies DCSA (Defense Counterintelligence and Security Agency)	$3,670,976	0.7%	Rank history: #9 in FY2021, #13 in FY2022, #12 in FY2024 and #14 in FY2025; up 1 since FY2022.
13	Tekpro Support Services, LLC Top agencies DOE (Department of Energy)	$3,247,897	0.7%	Rank history: #16 in FY2021, #14 in FY2022, #16 in FY2024 and #8 in FY2025; up 1 since FY2022.
14	Strativia LLC Top agencies Treasury (Department of the Treasury) AFRH (Armed Forces Retirement Home)	$2,907,984	0.6%	Rank history: not on the FY2021 list, #22 in FY2022, #56 in FY2024 and #64 in FY2025; up 8 since FY2022.
15	Chenega Defense & Aerospace Solutions, LLC Top agencies USAF (Department of the Air Force)	$2,798,863	0.6%	Rank history: #13 in FY2021, #12 in FY2022, #15 in FY2024 and #15 in FY2025; down 3 since FY2022.
16	Anthony Wayne Rehabilitation Center for Handicapped & Blind Inc. Top agencies USDA (Department of Agriculture) DFAS (Defense Finance and Accounting Service)	$2,472,303	0.5%	Rank history: #25 in FY2021, #30 in FY2022, #19 in FY2024 and #19 in FY2025; up 14 since FY2022.
17	Tower Strategy Group Inc Top agencies DOT (Department of Transportation)	$2,020,966	0.4%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #32 in FY2025; new.
18	Lucayan Technology Solutions LLC Top agencies Navy (Department of the Navy)	$1,910,810	0.4%	Rank history: not on the FY2021–FY2022 lists, #38 in FY2024 and #40 in FY2025; new.
19	Vertical Jobs Inc. 2 awardees Top agencies DOJ (Department of Justice)	$1,533,519	0.3%	Rank history: #26 in FY2021, #35 in FY2022, #30 in FY2024 and #49 in FY2025; up 16 since FY2022.
20	Golden Tech Systems Inc 2 awardees Top agencies Army (Department of the Army)	$1,524,503	0.3%	Rank history: not on the FY2021 list, #38 in FY2022, #26 in FY2024 and #30 in FY2025; up 18 since FY2022.
21	Quadient S.a. Top agencies DOE (Department of Energy) HHS (Department of Health and Human Services) Army (Department of the Army)	$1,414,574	0.3%	Rank history: not on the FY2021–FY2022 lists, #7 in FY2024 and #11 in FY2025; new.
22	Huntsville Rehabilitation Foundation Top agencies MDA (DOD Missile Defense Agency)	$1,379,972	0.3%	Rank history: #20 in FY2021, #28 in FY2022, #25 in FY2024 and #22 in FY2025; up 6 since FY2022.
23	Unami LLC Top agencies Navy (Department of the Navy)	$1,363,261	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
24	Riva Solutions Inc 2 awardees Top agencies NSF (National Science Foundation) DOT (Department of Transportation)	$1,358,296	0.3%	Rank history: #12 in FY2021, #20 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
25	Tundra Federal LLC Top agencies Treasury (Department of the Treasury)	$1,223,734	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
26	Nationwide It Services Inc. Top agencies HHS (Department of Health and Human Services)	$1,221,709	0.2%	Rank history: #43 in FY2021, #21 in FY2022, #21 in FY2024 and not on the FY2025 list; down 5 since FY2022.
27	Jamison Professional Services Inc. Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force) VA (Department of Veterans Affairs)	$1,126,643	0.2%	Rank history: #11 in FY2021, #23 in FY2022, #18 in FY2024 and #48 in FY2025; down 4 since FY2022.
28	Security 1 Solutions LLC Top agencies Navy (Department of the Navy)	$1,111,560	0.2%	Rank history: #27 in FY2021, #19 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
29	Point Rock Solutions, LLC Top agencies DTRA (Defense Threat Reduction Agency)	$1,111,481	0.2%	Rank history: #39 in FY2021, #32 in FY2022, #28 in FY2024 and not on the FY2025 list; up 3 since FY2022.
30	Pohaku Pacific LLC Top agencies DHA (Defense Health Agency)	$1,103,098	0.2%	Rank history: not on the FY2021–FY2022 lists, #54 in FY2024 and not on the FY2025 list; new.
31	Tri-Logistics LLC Top agencies Army (Department of the Army) RRB (Railroad Retirement Board) USDA (Department of Agriculture)	$1,091,687	0.2%	Rank history: not on the FY2021 list, #55 in FY2022, #82 in FY2024 and not on the FY2025 list; up 24 since FY2022.
32	KP Aminad JV LLC Top agencies Navy (Department of the Navy)	$1,079,300	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
33	Rose LI & Associates Inc Top agencies HHS (Department of Health and Human Services)	$1,063,388	0.2%	Rank history: not on the FY2021–FY2022 lists, #34 in FY2024 and not on the FY2025 list; new.
34	Gemini TECH Services LLC 2 awardees Top agencies Navy (Department of the Navy)	$1,022,084	0.2%	Rank history: #33 in FY2021, #29 in FY2022, #36 in FY2024 and #39 in FY2025; down 5 since FY2022.
35	Strategi Consulting, LLC Top agencies HHS (Department of Health and Human Services)	$1,016,938	0.2%	Rank history: #30 in FY2021, #27 in FY2022, #53 in FY2024 and #18 in FY2025; down 8 since FY2022.
36	Anchor Mental Health Association Inc. Top agencies DOI (Department of the Interior)	$1,007,647	0.2%	Rank history: #21 in FY2021, #31 in FY2022, #32 in FY2024 and #25 in FY2025; down 5 since FY2022.
37	Alltran Education Inc. Through DMT Solutions Global Corporation Top agencies USDA (Department of Agriculture) SSA (Social Security Administration) Commerce (Department of Commerce)	$971,572	0.2%	Rank history: #29 in FY2021, #41 in FY2022 and not on the FY2024–FY2025 lists; up 4 since FY2022.
38	BNF Technologies, Inc. Top agencies HHS (Department of Health and Human Services) SEC (Securities and Exchange Commission) Architectural and Transportation Barriers Compliance Board	$882,925	0.2%	Rank history: #54 in FY2021, #25 in FY2022, #44 in FY2024 and #77 in FY2025; down 13 since FY2022.
39	Essnova Solutions, Inc. Top agencies USDA (Department of Agriculture)	$879,996	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
40	Dynamic Integrated Services LLC Top agencies VA (Department of Veterans Affairs)	$839,898	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
41	Wits Solutions Inc. Top agencies HUD (Department of Housing and Urban Development) Army (Department of the Army)	$800,105	0.2%	Rank history: #23 in FY2021, #34 in FY2022, #40 in FY2024 and #27 in FY2025; down 7 since FY2022.
42	Living Invigorating Valuable Experiences, LLC (Live) Top agencies DOE (Department of Energy)	$780,044	0.2%	Rank history: not on the FY2021 list, #49 in FY2022, #77 in FY2024 and #65 in FY2025; up 7 since FY2022.
43	Bevera Solutions LLC Top agencies HHS (Department of Health and Human Services)	$778,999	0.2%	Rank history: #92 in FY2021, not on the FY2022 list, #96 in FY2024 and not on the FY2025 list; returned.
44	Concordant LLC Top agencies DOT (Department of Transportation)	$748,436	0.2%	Rank history: #15 in FY2021, #16 in FY2022, #49 in FY2024 and not on the FY2025 list; down 28 since FY2022.
45	Copial Business Strategists, LLC Top agencies HHS (Department of Health and Human Services)	$747,915	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
46	Assent Advisory Group LLC Top agencies Navy (Department of the Navy)	$690,547	0.1%	Rank history: not on the FY2021 list, #45 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
47	Insi Cloud Inc Top agencies HHS (Department of Health and Human Services)	$681,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
48	Integrative Sciences LLC Top agencies DOL (Department of Labor)	$660,666	0.1%	Rank history: #47 in FY2021, #48 in FY2022, #47 in FY2024 and #52 in FY2025; unchanged since FY2022.
49	CTR Management Group LLC Top agencies FTC (Federal Trade Commission)	$640,998	0.1%	Rank history: #36 in FY2021, #37 in FY2022, #50 in FY2024 and #55 in FY2025; down 12 since FY2022.
50	Soliel LLC Top agencies DOI (Department of the Interior)	$630,975	0.1%	Rank history: not on the FY2021–FY2022 lists, #45 in FY2024 and #61 in FY2025; new.
51	Aw-Sort LLC Top agencies VA (Department of Veterans Affairs)	$602,278	0.1%	Rank history: #60 in FY2021, #40 in FY2022, not on the FY2024 list and #62 in FY2025; down 11 since FY2022.
52	TSC Management, LLC Top agencies NSF (National Science Foundation) Commerce (Department of Commerce)	$579,609	0.1%	Rank history: not on the FY2021 list, #39 in FY2022, #35 in FY2024 and #29 in FY2025; down 13 since FY2022.
53	Impyrian LLC Top agencies HHS (Department of Health and Human Services)	$576,038	0.1%	Rank history: #46 in FY2021, #42 in FY2022, #52 in FY2024 and #53 in FY2025; down 11 since FY2022.
54	Quicksilver Mailing Services, LLC Top agencies Treasury (Department of the Treasury)	$539,991	0.1%	Rank history: #57 in FY2021, #52 in FY2022, #42 in FY2024 and #58 in FY2025; down 2 since FY2022.
55	Genesis Government Solutions Inc. Top agencies VA (Department of Veterans Affairs)	$532,440	0.1%	Rank history: not on the FY2021–FY2022 lists, #55 in FY2024 and not on the FY2025 list; new.
56	TSI Federal LLC Top agencies DOJ (Department of Justice)	$500,674	0.1%	Rank history: not on the FY2021–FY2022 lists, #22 in FY2024 and #36 in FY2025; new.
57	Gramercy Research Group, L.l.c Top agencies HHS (Department of Health and Human Services)	$499,558	0.1%	Rank history: not on the FY2021–FY2022 lists, #29 in FY2024 and not on the FY2025 list; new.
58	Enterprise Engineering Services LLC Top agencies DOT (Department of Transportation)	$491,932	0.1%	Rank history: #67 in FY2021, #51 in FY2022, #59 in FY2024 and #60 in FY2025; down 7 since FY2022.
59	Specpro Management Services, LLC Top agencies DOJ (Department of Justice)	$417,916	0.1%	Rank history: #55 in FY2021, #64 in FY2022 and not on the FY2024–FY2025 lists; up 5 since FY2022.
60	The Ravens Group, Inc. Top agencies VA (Department of Veterans Affairs)	$410,836	0.1%	Rank history: not on the FY2021–FY2022 lists, #60 in FY2024 and not on the FY2025 list; new.
61	Greengate LLC Top agencies DOE (Department of Energy)	$403,500	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
62	Hagerstown Goodwill Industries, Inc. Top agencies Treasury (Department of the Treasury)	$399,346	0.1%	Rank history: #58 in FY2021, #53 in FY2022, #62 in FY2024 and #46 in FY2025; down 9 since FY2022.
63	Integrated Solutions and Services Unlimited, Inc. Top agencies VA (Department of Veterans Affairs)	$369,846	0.1%	Rank history: not on the FY2021–FY2022 lists, #63 in FY2024 and not on the FY2025 list; new.
64	Tamayo Federal Solutions, LLC Top agencies HHS (Department of Health and Human Services)	$364,869	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
65	Logzone Inc. Top agencies Army (Department of the Army)	$358,060	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 49 since FY2022.
66	GW Commercial Services Inc. Top agencies DHS (Department of Homeland Security)	$347,304	0.1%	Rank history: #62 in FY2021, #57 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
67	Mohawk-Phoenix Joint Venture Top agencies DOT (Department of Transportation)	$333,317	0.1%	Rank history: not on the FY2021–FY2022 lists, #31 in FY2024 and #31 in FY2025; new.
68	Connexus Hub Inc Top agencies Navy (Department of the Navy)	$327,604	0.1%	Rank history: #22 in FY2021, #24 in FY2022 and not on the FY2024–FY2025 lists; down 44 since FY2022.
69	GFK US MRI LLC Top agencies HHS (Department of Health and Human Services)	$300,000	0.1%	Rank history: not on the FY2021 list, #77 in FY2022 and not on the FY2024–FY2025 lists; up 8 since FY2022.
70	Thomson Reuters (Tax & Accounting) Inc. Top agencies Treasury (Department of the Treasury) USAID (US Agency for International Development)	$294,580	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
71	Govsolutions Inc. Top agencies ED (Department of Education)	$283,331	0.1%	Rank history: not on the FY2021–FY2022 lists, #14 in FY2024 and #41 in FY2025; new.
72	Deutsche Post AG Through DHL International B.s.c. Top agencies Army (Department of the Army)	$263,424	0.1%	Rank history: #50 in FY2021, #46 in FY2022 and not on the FY2024–FY2025 lists; down 26 since FY2022.
73	Neopost SA Through Quadient, Inc. Top agencies DHS (Department of Homeland Security) VA (Department of Veterans Affairs) DOJ (Department of Justice)	$263,311	0.1%	Rank history: #37 in FY2021, #26 in FY2022 and not on the FY2024–FY2025 lists; down 47 since FY2022.
74	Benefactors Counsel LLC Top agencies Navy (Department of the Navy)	$247,377	<0.1%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2024 and #99 in FY2025; new.
75	Emory University Top agencies HHS (Department of Health and Human Services)	$245,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
76	C2M LLC Top agencies Commerce (Department of Commerce)	$242,043	<0.1%	Rank history: not on the FY2021 list, #59 in FY2022 and not on the FY2024–FY2025 lists; down 17 since FY2022.
77	Bizybee Professional Staffing & Biz Ness Solutions, LLC Top agencies DOT (Department of Transportation)	$240,912	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	Strategix Management LLC Top agencies SBA (Small Business Administration)	$239,833	<0.1%	Rank history: #70 in FY2021, #63 in FY2022, #72 in FY2024 and not on the FY2025 list; down 15 since FY2022.
79	Strategic Innovative Solutions LLC Top agencies EPA (Environmental Protection Agency) HHS (Department of Health and Human Services)	$239,278	<0.1%	Rank history: not on the FY2021 list, #73 in FY2022, #74 in FY2024 and #78 in FY2025; down 6 since FY2022.
80	History Associates Incorporated Top agencies HHS (Department of Health and Human Services) Commerce (Department of Commerce)	$230,998	<0.1%	Rank history: #72 in FY2021, #56 in FY2022, #65 in FY2024 and #67 in FY2025; down 24 since FY2022.
81	Action Technologies, LLC Top agencies Army (Department of the Army)	$227,246	<0.1%	Rank history: #66 in FY2021, #66 in FY2022, #68 in FY2024 and #70 in FY2025; down 15 since FY2022.
82	Transportation North Carolina Department of Through Governors Office Top agencies EPA (Environmental Protection Agency)	$224,160	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Nysarc Inc. Top agencies VA (Department of Veterans Affairs)	$220,063	<0.1%	Rank history: #75 in FY2021, #70 in FY2022, #75 in FY2024 and not on the FY2025 list; down 13 since FY2022.
84	Goodworks, Inc. Top agencies Army (Department of the Army)	$218,999	<0.1%	Rank history: #73 in FY2021, #69 in FY2022, #69 in FY2024 and #74 in FY2025; down 15 since FY2022.
85	Document Storage Systems, Inc. Top agencies VA (Department of Veterans Affairs)	$208,762	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
86	LWH Enterprises Inc Top agencies HHS (Department of Health and Human Services)	$203,383	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
87	The Financial Times Ltd Top agencies Commerce (Department of Commerce) EXIM (Export Import Bank of the US)	$193,383	<0.1%	Rank history: #87 in FY2021, #87 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
88	Nextrinsic Corp. Top agencies USAF (Department of the Air Force)	$191,110	<0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2024 and not on the FY2025 list; new.
89	The Arc of the District of Columbia Inc. Top agencies USDA (Department of Agriculture)	$188,182	<0.1%	Rank history: #79 in FY2021, #79 in FY2022, #80 in FY2024 and not on the FY2025 list; down 10 since FY2022.
90	Acuity Design Group Inc Top agencies Navy (Department of the Navy)	$185,435	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
91	The Burgiss Group LLC Top agencies DFC (International Development Finance Corporation)	$182,400	<0.1%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2024 and #82 in FY2025; new.
92	Skils'kin Top agencies HHS (Department of Health and Human Services)	$179,987	<0.1%	Rank history: not on the FY2021–FY2022 lists, #78 in FY2024 and #83 in FY2025; up 12 since FY2022.
93	Axiom Corporation Top agencies VA (Department of Veterans Affairs)	$179,086	<0.1%	Rank history: not on the FY2021–FY2022 lists, #84 in FY2024 and #89 in FY2025; new.
94	Camp Alliance Inc. Top agencies VA (Department of Veterans Affairs)	$163,365	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	Express Business Systems Inc. Top agencies SSA (Social Security Administration)	$157,052	<0.1%	Rank history: #77 in FY2021, #60 in FY2022, #64 in FY2024 and #66 in FY2025; down 35 since FY2022.
96	Greenbrier Government Solutions Inc. Top agencies Navy (Department of the Navy)	$155,951	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
97	Healthconnect Texas Top agencies VA (Department of Veterans Affairs)	$155,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
98	Airlines Reporting Corporation Top agencies DHS (Department of Homeland Security)	$150,000	<0.1%	Rank history: #85 in FY2021, #84 in FY2022 and not on the FY2024–FY2025 lists; down 14 since FY2022.
99	Chiricahua Procurement LLC Top agencies Army (Department of the Army)	$145,392	<0.1%	Rank history: not on the FY2021–FY2022 lists, #88 in FY2024 and #90 in FY2025; new.
100	Professional Management Consulting Services LLC Top agencies NRC (Nuclear Regulatory Commission)	$142,000	<0.1%	Rank history: #83 in FY2021, #88 in FY2022, #85 in FY2024 and #79 in FY2025; down 12 since FY2022.

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100 of 227 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 $498 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 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 561499 contractors in FY2023?

1. Fedex Corp ($293M), 2. Pitney Bowes Inc. ($36.3M), 3. Servicesource Inc. ($22.6M), 4. Goodwill Industries of San Antonio Contract Services ($19.6M), 5. Cyberstar LLC ($9.52M), 6. Conduent Federal Solutions LLC ($9.05M), 7. Peckham Vocational Industries, Inc. ($7.63M), 8. The Chenega Corporation ($5.33M), 9. United Systems of Arkansas, Inc. ($4.78M), 10. CACI International Inc. ($4.08M).

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