Top 100 Contractors in PSC AJ13: General Science & Technology R&D Services; General Science & Technology; Experimental Development, FY2023

Name: Top 100 Contractors in PSC AJ13: General Science & Technology R&D Services; General Science & Technology; Experimental Development, FY2023
Creator: GovTribe

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

The top 10 won 74% of FY2023 PSC AJ13 contract dollars

Contract obligations: $879,183,580 Net of deobligations, by contracts coded PSC AJ13
Contractors: 149 Parent companies with an obligation
Largest contractor: National Security Technology Accelerator Inc. $427 million, 48.4% 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	National Security Technology Accelerator Inc. Top agencies WHS (DOD Washington Headquarters Service) OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$427,149,131	48.4%	Rank history: #1 in FY2021, #1 in FY2022, #1 in FY2024 and #4 in FY2025; unchanged since FY2022.
2	American Systems Corporation Top agencies OSD (Office of the Secretary of Defense)	$72,643,283	8.2%	Rank history: #6 in FY2021, #2 in FY2022, #3 in FY2024 and #1 in FY2025; unchanged since FY2022.
3	Assurance Technology Corp Top agencies Navy (Department of the Navy)	$31,401,329	3.6%	Rank history: not on the FY2021 list, #3 in FY2022, #5 in FY2024 and #2 in FY2025; unchanged since FY2022.
4	Modern Technology Solutions, Inc. Top agencies OSD (Office of the Secretary of Defense)	$25,792,135	2.9%	Rank history: #3 in FY2021, #5 in FY2022, #8 in FY2024 and #5 in FY2025; up 1 since FY2022.
5	Neany, Inc. Top agencies OSD (Office of the Secretary of Defense)	$25,453,332	2.9%	Rank history: not on the FY2021–FY2022 lists, #4 in FY2024 and #12 in FY2025; new.
6	Applied Research Associates, Inc. Top agencies OSD (Office of the Secretary of Defense) Army (Department of the Army)	$15,419,802	1.7%	Rank history: #92 in FY2021, #9 in FY2022, #7 in FY2024 and #14 in FY2025; up 3 since FY2022.
7	Mnemonics Inc. Top agencies Navy (Department of the Navy)	$14,176,969	1.6%	Rank history: not on the FY2021–FY2022 lists, #18 in FY2024 and #13 in FY2025; new.
8	Excet, LLC Top agencies Navy (Department of the Navy)	$13,870,362	1.6%	Rank history: #8 in FY2021, #4 in FY2022, #10 in FY2024 and #21 in FY2025; down 4 since FY2022.
9	Ensco Inc. Top agencies USAF (Department of the Air Force)	$12,833,980	1.5%	Rank history: #5 in FY2021, #6 in FY2022, #13 in FY2024 and #24 in FY2025; down 3 since FY2022.
10	Kbr, Inc. 2 awardees, including KBR Wyle Services, LLC Top agencies Navy (Department of the Navy)	$12,689,328	1.4%	Rank history: #11 in FY2021, #7 in FY2022, #17 in FY2024 and not on the FY2025 list; down 3 since FY2022.
11	Windlift Inc. Top agencies Navy (Department of the Navy)	$11,386,281	1.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
12	Linquest Corporation Through The Perduco Group, Inc. Top agencies USAF (Department of the Air Force)	$10,808,819	1.2%	Rank history: not on the FY2021 list, #15 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
13	Nanotech Security Corp Top agencies Treasury (Department of the Treasury)	$9,152,119	1.0%	Rank history: #9 in FY2021, #13 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
14	General Dynamics Corporation 5 awardees, including Praxis Engineering Technologies LLC, General Dynamics Information Technology, Inc. and General Dynamics Mission Systems, Inc. Top agencies Army (Department of the Army) WHS (DOD Washington Headquarters Service) USAF (Department of the Air Force)	$9,059,995	1.0%	Rank history: #12 in FY2021, #11 in FY2022, #19 in FY2024 and #31 in FY2025; down 3 since FY2022.
15	Envisioneering, Inc. Top agencies Navy (Department of the Navy)	$8,846,410	1.0%	Rank history: not on the FY2021 list, #20 in FY2022, #29 in FY2024 and #32 in FY2025; up 5 since FY2022.
16	Battelle Memorial Institute Top agencies USAF (Department of the Air Force) Navy (Department of the Navy)	$8,343,156	0.9%	Rank history: #93 in FY2021, #29 in FY2022, #11 in FY2024 and #11 in FY2025; up 13 since FY2022.
17	Microsoft Corporation Top agencies USAF (Department of the Air Force)	$6,799,058	0.8%	Rank history: not on the FY2021–FY2022 lists, #12 in FY2024 and #10 in FY2025; new.
18	Systima Technologies Inc. Top agencies USAF (Department of the Air Force)	$6,500,665	0.7%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2024 and #43 in FY2025; new.
19	The Mitre Corporation Top agencies DHS (Department of Homeland Security) HHS (Department of Health and Human Services)	$6,361,434	0.7%	Rank history: #45 in FY2021, #50 in FY2022, #35 in FY2024 and #75 in FY2025; up 31 since FY2022.
20	Via Science Inc. Top agencies USAF (Department of the Air Force)	$5,890,000	0.7%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
21	Jacobs Engineering Group Inc. 5 awardees, including The Keyw Corporation and Amentum Technology, Inc. Top agencies Navy (Department of the Navy) WHS (DOD Washington Headquarters Service)	$5,745,988	0.7%	Rank history: #15 in FY2021, #17 in FY2022, #70 in FY2024 and not on the FY2025 list; down 4 since FY2022.
22	Stellar Science Ltd. Co. Top agencies USAF (Department of the Air Force)	$5,198,857	0.6%	Rank history: #41 in FY2021, #41 in FY2022 and not on the FY2024–FY2025 lists; up 19 since FY2022.
23	Tekla Research, Inc. Top agencies Navy (Department of the Navy)	$5,138,753	0.6%	Rank history: #18 in FY2021, #34 in FY2022, #25 in FY2024 and #27 in FY2025; up 11 since FY2022.
24	Kenai Defense Company LLC Top agencies USAF (Department of the Air Force)	$4,877,697	0.6%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
25	University of Illinois Top agencies Army (Department of the Army)	$4,449,991	0.5%	Rank history: #35 in FY2021, #28 in FY2022, #57 in FY2024 and not on the FY2025 list; up 3 since FY2022.
26	Acuity Edge, Inc. Top agencies NASA (National Aeronautics and Space Administration)	$3,828,454	0.4%	Rank history: #29 in FY2021, #23 in FY2022, #33 in FY2024 and #84 in FY2025; down 3 since FY2022.
27	EA Engineering, Science, and Technology, Inc., PBC Top agencies EPA (Environmental Protection Agency)	$3,696,653	0.4%	Rank history: not on the FY2021 list, #69 in FY2022, #48 in FY2024 and #90 in FY2025; up 42 since FY2022.
28	Parsons Corporation Through Parsons Government Services Inc. Top agencies Army (Department of the Army)	$3,517,747	0.4%	Rank history: not on the FY2021 list, #24 in FY2022 and not on the FY2024–FY2025 lists; down 4 since FY2022.
29	DCS Corporation Top agencies USAF (Department of the Air Force)	$3,504,791	0.4%	Rank history: #14 in FY2021, #16 in FY2022, #76 in FY2024 and #91 in FY2025; down 13 since FY2022.
30	The Johns Hopkins University Through The Johns Hopkins University Applied Physics Laboratory LLC Top agencies DHA (Defense Health Agency)	$3,492,693	0.4%	Rank history: #27 in FY2021, #18 in FY2022 and not on the FY2024–FY2025 lists; down 12 since FY2022.
31	Halo X Ray Technologies Limited Top agencies DHS (Department of Homeland Security)	$3,391,835	0.4%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
32	Auburn University Top agencies USAF (Department of the Air Force)	$3,012,027	0.3%	Rank history: not on the FY2021–FY2022 lists, #40 in FY2024 and not on the FY2025 list; new.
33	Trimble Inc. Top agencies Army (Department of the Army)	$2,997,750	0.3%	Rank history: #33 in FY2021, #19 in FY2022 and not on the FY2024–FY2025 lists; down 14 since FY2022.
34	Teledyne Technologies Incorporated 2 awardees, including Nova Research, Inc. and Teledyne Scientific & Imaging, LLC Top agencies Navy (Department of the Navy) NASA (National Aeronautics and Space Administration)	$2,834,608	0.3%	Rank history: not on the FY2021–FY2022 lists, #22 in FY2024 and #36 in FY2025; new.
35	Alaire Technologies Inc. Top agencies Navy (Department of the Navy)	$2,827,700	0.3%	Rank history: #20 in FY2021, #25 in FY2022, #34 in FY2024 and #23 in FY2025; down 10 since FY2022.
36	Telesecurity Sciences, Inc. Top agencies DHS (Department of Homeland Security)	$2,448,221	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
37	Dignitas Technologies, LLC Top agencies Army (Department of the Army)	$2,415,079	0.3%	Rank history: #25 in FY2021, #26 in FY2022, #27 in FY2024 and #52 in FY2025; down 11 since FY2022.
38	Global Embedded Technologies, Inc. Top agencies Army (Department of the Army)	$2,084,762	0.2%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2024 and #82 in FY2025; new.
39	HP Enterprise Services LLC 2 awardees, including Peraton Technology Services Inc. and Peraton Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$2,027,068	0.2%	Rank history: #23 in FY2021, #47 in FY2022 and not on the FY2024–FY2025 lists; up 8 since FY2022.
40	The Charles Stark Draper Laboratory, Inc. Top agencies Army (Department of the Army) USSOCOM (United States Special Operations Command)	$1,966,271	0.2%	Rank history: #39 in FY2021, #32 in FY2022, #45 in FY2024 and #9 in FY2025; down 8 since FY2022.
41	Infrascan Inc. Top agencies DHA (Defense Health Agency)	$1,962,500	0.2%	Rank history: #43 in FY2021, not on the FY2022 list, #72 in FY2024 and not on the FY2025 list; up 60 since FY2022.
42	Simx, Inc. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,896,467	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
43	Computational Physics, Inc. Top agencies Navy (Department of the Navy)	$1,800,877	0.2%	Rank history: #40 in FY2021, #42 in FY2022, #68 in FY2024 and #48 in FY2025; down 1 since FY2022.
44	The Survice Engineering Company LLC Top agencies Army (Department of the Army)	$1,722,225	0.2%	Rank history: #21 in FY2021, #100 in FY2022, #42 in FY2024 and #44 in FY2025; up 56 since FY2022.
45	Radiance Technologies Inc. Top agencies USAF (Department of the Air Force)	$1,664,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #91 in FY2024 and not on the FY2025 list; new.
46	Human Resources Research Organization (Humrro) Top agencies Army (Department of the Army)	$1,652,198	0.2%	Rank history: not on the FY2021 list, #87 in FY2022, #46 in FY2024 and #33 in FY2025; up 41 since FY2022.
47	RB Management Consultants LLC Top agencies VA (Department of Veterans Affairs)	$1,609,086	0.2%	Rank history: #52 in FY2021, #46 in FY2022, #56 in FY2024 and #55 in FY2025; down 1 since FY2022.
48	Hyperion Technology Group Inc Top agencies Army (Department of the Army)	$1,499,998	0.2%	Rank history: not on the FY2021–FY2022 lists, #95 in FY2024 and #74 in FY2025; new.
49	University of Texas System 2 awardees, including University of Texas At Austin Top agencies Navy (Department of the Navy) VA (Department of Veterans Affairs)	$1,423,673	0.2%	Rank history: #95 in FY2021, #84 in FY2022 and not on the FY2024–FY2025 lists; up 35 since FY2022.
50	University Research Foundation, Inc. Top agencies Navy (Department of the Navy)	$1,410,174	0.2%	Rank history: #31 in FY2021, #45 in FY2022, #47 in FY2024 and #51 in FY2025; down 5 since FY2022.
51	Flexsys Inc. Top agencies USAF (Department of the Air Force)	$1,299,783	0.1%	Rank history: not on the FY2021 list, #98 in FY2022 and not on the FY2024–FY2025 lists; up 47 since FY2022.
52	Leidos Holdings, Inc. 2 awardees, including Leidos, Inc. Top agencies OSD (Office of the Secretary of Defense) Navy (Department of the Navy)	$1,257,646	0.1%	Rank history: #10 in FY2021, #12 in FY2022, #9 in FY2024 and #7 in FY2025; down 40 since FY2022.
53	FN America LLC Top agencies Army (Department of the Army)	$1,200,720	0.1%	Rank history: not on the FY2021–FY2022 lists, #41 in FY2024 and not on the FY2025 list; new.
54	Wittenstein Inc. Through Attocube Systems GMBH Top agencies Navy (Department of the Navy)	$1,097,953	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
55	Nova Research, Inc. Top agencies Navy (Department of the Navy)	$1,045,648	0.1%	Rank history: #22 in FY2021, #21 in FY2022 and not on the FY2024–FY2025 lists; down 34 since FY2022.
56	Summerwind Consultants Inc. Top agencies Army (Department of the Army)	$974,657	0.1%	Rank history: not on the FY2021–FY2022 lists, #58 in FY2024 and #65 in FY2025; new.
57	Resilient Cognitive Solutions LLC Top agencies Army (Department of the Army)	$919,952	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
58	Qortek Inc. Top agencies Army (Department of the Army)	$899,994	0.1%	Rank history: not on the FY2021 list, #68 in FY2022 and not on the FY2024–FY2025 lists; up 10 since FY2022.
59	Intellisense Systems Inc Top agencies Army (Department of the Army)	$799,999	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
60	State of California Controllers Office Through University of California, LOS Angeles Top agencies Navy (Department of the Navy) Army (Department of the Army)	$783,677	0.1%	Rank history: #81 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 48 since FY2022.
61	ICF International, Inc. Through ICF Incorporated, L.L.C. Top agencies Army (Department of the Army)	$783,236	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
62	Creare LLC Top agencies Army (Department of the Army)	$769,171	0.1%	Rank history: not on the FY2021 list, #43 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
63	Spectral Sensor Solutions, LLC Top agencies Army (Department of the Army)	$740,806	0.1%	Rank history: #88 in FY2021, not on the FY2022 list, #92 in FY2024 and #63 in FY2025; returned.
64	Cornerstone Research Group Inc Top agencies USAF (Department of the Air Force)	$740,063	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
65	Analytic Services Inc. Through Advanced Technology International Top agencies Navy (Department of the Navy)	$740,025	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
66	Gartner, Inc. Through Personnel Decisions Research Institutes, LLC Top agencies Army (Department of the Army)	$642,484	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 36 since FY2022.
67	Eastern Research Group Inc. Top agencies EPA (Environmental Protection Agency)	$641,489	0.1%	Rank history: not on the FY2021–FY2022 lists, #93 in FY2024 and #83 in FY2025; new.
68	Amivas US LLC Top agencies Army (Department of the Army)	$613,277	0.1%	Rank history: #17 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
69	Luna Innovations Incorporated Through Luna Labs USA LLC Top agencies Army (Department of the Army)	$598,693	0.1%	Rank history: #44 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
70	L3Harris Technologies, Inc. 2 awardees Top agencies Army (Department of the Army)	$596,310	0.1%	Rank history: #30 in FY2021, #35 in FY2022, #74 in FY2024 and #79 in FY2025; down 35 since FY2022.
71	Tessellated Inc. Top agencies Army (Department of the Army)	$590,901	0.1%	Rank history: not on the FY2021–FY2022 lists, #77 in FY2024 and not on the FY2025 list; new.
72	Wood Environment & Infrastructure Solutions Inc. Through WSP USA Environment & Infrastructure Inc. Top agencies Navy (Department of the Navy)	$577,521	0.1%	Rank history: not on the FY2021 list, #63 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
73	University of Massachusetts Through University of Massachusetts Dartmouth Top agencies DHS (Department of Homeland Security)	$571,878	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
74	Melatech, L.L.C. Top agencies Army (Department of the Army)	$554,857	0.1%	Rank history: not on the FY2021 list, #74 in FY2022 and not on the FY2024–FY2025 lists; unchanged since FY2022.
75	Nanosonic Inc. Top agencies Army (Department of the Army)	$550,000	0.1%	Rank history: not on the FY2021 list, #72 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
76	Triton Systems, Inc. Top agencies Army (Department of the Army)	$549,969	0.1%	Rank history: not on the FY2021 list, #73 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
77	CFD Research Corporation Top agencies Army (Department of the Army)	$539,363	0.1%	Rank history: not on the FY2021 list, #71 in FY2022, #86 in FY2024 and not on the FY2025 list; down 6 since FY2022.
78	Duke University Top agencies VA (Department of Veterans Affairs)	$537,036	0.1%	Rank history: not on the FY2021 list, #77 in FY2022 and not on the FY2024–FY2025 lists; down 1 since FY2022.
79	Parabon Nanolabs, Inc. Top agencies Army (Department of the Army)	$510,614	0.1%	Rank history: not on the FY2021 list, #70 in FY2022 and not on the FY2024–FY2025 lists; down 9 since FY2022.
80	Fors Marsh Group LLC Top agencies Army (Department of the Army)	$501,431	0.1%	Rank history: #57 in FY2021, #82 in FY2022 and not on the FY2024–FY2025 lists; up 2 since FY2022.
81	Bally Ribbon Mills Top agencies DLA (Defense Logistics Agency)	$500,000	0.1%	Rank history: not on the FY2021–FY2022 lists, #83 in FY2024 and not on the FY2025 list; new.
82	Dynasil Corporation of America Through Radiation Monitoring Devices, Inc. Top agencies DHS (Department of Homeland Security)	$499,643	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Versatol, LLC Top agencies Army (Department of the Army)	$498,000	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
84	Kratos Defense & Security Solutions, Inc. Through Kratos S1, Inc. Top agencies Army (Department of the Army)	$490,949	0.1%	Rank history: not on the FY2021 list, #44 in FY2022 and not on the FY2024–FY2025 lists; down 40 since FY2022.
85	Resilient Power Systems Inc. Top agencies Navy (Department of the Navy)	$481,413	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
86	Cenith Innovations LLC Top agencies USAF (Department of the Air Force)	$447,260	0.1%	Rank history: not on the FY2021 list, #37 in FY2022, #65 in FY2024 and #30 in FY2025; down 49 since FY2022.
87	Terragon Environmental Technologies Inc. Top agencies Army (Department of the Army)	$398,770	<0.1%	Rank history: not on the FY2021–FY2022 lists, #88 in FY2024 and not on the FY2025 list; new.
88	Dalcom LLC Top agencies Army (Department of the Army)	$389,560	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
89	Research Triangle Institute Top agencies USDA (Department of Agriculture)	$386,350	<0.1%	Rank history: not on the FY2021 list, #65 in FY2022 and not on the FY2024–FY2025 lists; down 24 since FY2022.
90	Aptima Inc. Top agencies Army (Department of the Army)	$385,560	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 26 since FY2022.
91	Physical Sciences Inc. Top agencies Army (Department of the Army)	$368,360	<0.1%	Rank history: #70 in FY2021, #55 in FY2022 and not on the FY2024–FY2025 lists; down 36 since FY2022.
92	GSI Environmental Inc. Top agencies Navy (Department of the Navy)	$364,156	<0.1%	Rank history: not on the FY2021 list, #31 in FY2022, not on the FY2024 list and #73 in FY2025; down 61 since FY2022.
93	Freedom Flight Works, Inc. Top agencies Army (Department of the Army)	$362,711	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
94	Board of Governers State University System of Florida Through University of Florida Top agencies USAF (Department of the Air Force)	$349,999	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
95	Huntington Ingalls Industries, Inc. Through HII Technical Solutions Corporation Top agencies Navy (Department of the Navy)	$347,989	<0.1%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2024 and #25 in FY2025; new.
96	Woods Hole Oceanographic Institution Top agencies DHS (Department of Homeland Security)	$331,398	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
97	Drasgow Consulting Group, LLC Top agencies Army (Department of the Army)	$324,250	<0.1%	Rank history: #71 in FY2021, not on the FY2022 list, not on the FY2024 list and #93 in FY2025; up 6 since FY2022.
98	Intelligent Designs LLC Top agencies Navy (Department of the Navy)	$303,824	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 25 since FY2022.
99	Massachusetts Institute of Technology Top agencies Army (Department of the Army)	$300,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
100	Impressio Inc Top agencies Army (Department of the Army)	$275,000	<0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.

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100 of 149 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 $883 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 PSC AJ13 contractors in FY2023?

1. National Security Technology Accelerator Inc. ($427M), 2. American Systems Corporation ($72.6M), 3. Assurance Technology Corp ($31.4M), 4. Modern Technology Solutions, Inc. ($25.8M), 5. Neany, Inc. ($25.5M), 6. Applied Research Associates, Inc. ($15.4M), 7. Mnemonics Inc. ($14.2M), 8. Excet, LLC ($13.9M), 9. Ensco Inc. ($12.8M), 10. Kbr, Inc. ($12.7M).

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