Top 100 Contractors in PSC B599: Other Special Studies and Analysis, FY2023

Full ranking

Rank	Contractor	Net obligations	Share	Trend
1	Booz Allen Hamilton Holding Corporation Through Booz Allen Hamilton Inc. Top agencies NASA (National Aeronautics and Space Administration) DOT (Department of Transportation) HHS (Department of Health and Human Services)	$78,786,549	15.3%	Rank history: #2 in FY2021, #1 in FY2022, #2 in FY2024 and #1 in FY2025; unchanged since FY2022.
2	Research Triangle Institute Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$66,363,596	12.9%	Rank history: #1 in FY2021, #2 in FY2022, #1 in FY2024 and #2 in FY2025; unchanged since FY2022.
3	The Rand Corporation Top agencies USAF (Department of the Air Force) DHS (Department of Homeland Security)	$52,306,041	10.1%	Rank history: #3 in FY2021, #3 in FY2022, #6 in FY2024 and #3 in FY2025; unchanged since FY2022.
4	Emory University Top agencies HHS (Department of Health and Human Services) DOT (Department of Transportation)	$48,913,600	9.5%	Rank history: not on the FY2021 list, #14 in FY2022, #17 in FY2024 and #7 in FY2025; up 10 since FY2022.
5	Janus Research Group, LLC Top agencies Army (Department of the Army)	$22,366,567	4.3%	Rank history: #4 in FY2021, #4 in FY2022, #9 in FY2024 and #6 in FY2025; down 1 since FY2022.
6	Mathematica Inc 2 awardees Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services) SSA (Social Security Administration)	$18,185,376	3.5%	Rank history: #18 in FY2021, #30 in FY2022, #3 in FY2024 and not on the FY2025 list; up 24 since FY2022.
7	Baylor College of Medicine Top agencies HHS (Department of Health and Human Services)	$14,460,421	2.8%	Rank history: #11 in FY2021, #15 in FY2022, #7 in FY2024 and #8 in FY2025; up 8 since FY2022.
8	Mid Atlantic Technical and Executive Consulting, LLC Top agencies Navy (Department of the Navy) USAF (Department of the Air Force)	$9,266,799	1.8%	Rank history: #22 in FY2021, #22 in FY2022, #11 in FY2024 and #12 in FY2025; up 14 since FY2022.
9	Westat, Inc. Top agencies USDA (Department of Agriculture) HHS (Department of Health and Human Services)	$8,065,548	1.6%	Rank history: #9 in FY2021, #18 in FY2022, #4 in FY2024 and not on the FY2025 list; up 9 since FY2022.
10	Cooper Zietz Engineers, Inc. Top agencies DOI (Department of the Interior) HHS (Department of Health and Human Services)	$7,435,473	1.4%	Rank history: #21 in FY2021, #23 in FY2022, #18 in FY2024 and #62 in FY2025; up 13 since FY2022.
11	Cssi Inc. 2 awardees Top agencies DOT (Department of Transportation)	$7,158,066	1.4%	Rank history: #8 in FY2021, #12 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
12	National Academy of Sciences Top agencies DOE (Department of Energy) DHS (Department of Homeland Security) SSA (Social Security Administration)	$6,459,894	1.3%	Rank history: #6 in FY2021, #11 in FY2022, #13 in FY2024 and not on the FY2025 list; down 1 since FY2022.
13	The Boeing Company 3 awardees Top agencies USAF (Department of the Air Force)	$6,013,058	1.2%	Rank history: #5 in FY2021, #6 in FY2022, #10 in FY2024 and not on the FY2025 list; down 7 since FY2022.
14	The Mitre Corporation Top agencies HHS (Department of Health and Human Services) OPM (Office of Personnel Management) DHS (Department of Homeland Security)	$5,787,565	1.1%	Rank history: #31 in FY2021, #41 in FY2022, #26 in FY2024 and not on the FY2025 list; up 27 since FY2022.
15	Tanaq Management Services LLC Top agencies HHS (Department of Health and Human Services)	$5,483,369	1.1%	Rank history: not on the FY2021–FY2022 lists, #16 in FY2024 and #10 in FY2025; new.
16	Productable Inc. Top agencies USAF (Department of the Air Force)	$4,786,000	0.9%	Rank history: #35 in FY2021, #37 in FY2022, #73 in FY2024 and not on the FY2025 list; up 21 since FY2022.
17	Rector & Visitors of the University of Virginia Top agencies DOT (Department of Transportation) Navy (Department of the Navy)	$4,649,303	0.9%	Rank history: #39 in FY2021, #50 in FY2022 and not on the FY2024–FY2025 lists; up 33 since FY2022.
18	Cardno - Amec Foster Wheeler Public Works Joint Venture Top agencies Navy (Department of the Navy)	$4,641,213	0.9%	Rank history: #65 in FY2021, #27 in FY2022 and not on the FY2024–FY2025 lists; up 9 since FY2022.
19	The Broad Institute, Inc. Top agencies HHS (Department of Health and Human Services)	$3,632,944	0.7%	Rank history: #7 in FY2021, #13 in FY2022, #5 in FY2024 and #13 in FY2025; down 6 since FY2022.
20	The Johns Hopkins University Through The Johns Hopkins University Applied Physics Laboratory LLC Top agencies SSA (Social Security Administration) Commerce (Department of Commerce)	$3,198,973	0.6%	Rank history: #14 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
21	Xtec, Incorporated Top agencies HHS (Department of Health and Human Services)	$3,057,148	0.6%	Rank history: not on the FY2021 list, #25 in FY2022, #23 in FY2024 and not on the FY2025 list; up 4 since FY2022.
22	University of Washington Top agencies HHS (Department of Health and Human Services)	$2,992,250	0.6%	Rank history: #25 in FY2021, #19 in FY2022, #19 in FY2024 and #43 in FY2025; down 3 since FY2022.
23	KAI Research Inc. Through Navitas Clinical Research Inc. Top agencies HHS (Department of Health and Human Services)	$2,682,814	0.5%	Rank history: #30 in FY2021, #36 in FY2022 and not on the FY2024–FY2025 lists; up 13 since FY2022.
24	Fors Marsh Group LLC Top agencies DHRA (Defense Human Resources Activity)	$2,636,431	0.5%	Rank history: #60 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; returned.
25	Integrated Solutions for Systems Inc. Top agencies USAF (Department of the Air Force)	$2,594,066	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
26	Nova Global Supply and Services LLC 2 awardees, including Valiant Global Defense Services Inc. Top agencies Army (Department of the Army)	$2,585,956	0.5%	Rank history: #12 in FY2021, #21 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
27	Group W Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$2,420,569	0.5%	Rank history: #13 in FY2021, #26 in FY2022, #14 in FY2024 and #9 in FY2025; down 1 since FY2022.
28	Social Impact Inc. Top agencies USAID (US Agency for International Development)	$2,400,000	0.5%	Rank history: not on the FY2021 list, #35 in FY2022, #21 in FY2024 and not on the FY2025 list; up 7 since FY2022.
29	ABT Global LLC 2 awardees Top agencies USDA (Department of Agriculture) DOE (Department of Energy)	$2,397,733	0.5%	Rank history: #17 in FY2021, #40 in FY2022 and not on the FY2024–FY2025 lists; up 11 since FY2022.
30	Envirosystems Management Inc. Top agencies DOI (Department of the Interior)	$2,374,635	0.5%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
31	Regents of the University of Michigan Top agencies DOT (Department of Transportation) USDA (Department of Agriculture)	$2,365,945	0.5%	Rank history: #63 in FY2021, #63 in FY2022, #78 in FY2024 and not on the FY2025 list; up 32 since FY2022.
32	Rhodium Group LLC Top agencies USAF (Department of the Air Force)	$2,330,000	0.5%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #38 in FY2025; new.
33	Arrowpoint Technologies Inc. Through Lynchval Systems Worldwide, Inc. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$2,216,251	0.4%	Rank history: #27 in FY2021, #34 in FY2022 and not on the FY2024–FY2025 lists; up 1 since FY2022.
34	Systems Planning and Analysis, Inc. Top agencies DARPA (Defense Advanced Research Projects Agency) WHS (DOD Washington Headquarters Service) Navy (Department of the Navy)	$2,191,674	0.4%	Rank history: #19 in FY2021, #29 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
35	T&E Technologies, LLC Top agencies Navy (Department of the Navy)	$2,179,921	0.4%	Rank history: #26 in FY2021, #31 in FY2022, #89 in FY2024 and not on the FY2025 list; down 4 since FY2022.
36	Lockheed Martin Corporation 3 awardees Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force) Navy (Department of the Navy)	$2,149,023	0.4%	Rank history: #98 in FY2021, #10 in FY2022 and not on the FY2024–FY2025 lists; down 26 since FY2022.
37	Iteris, Inc. Top agencies DOT (Department of Transportation)	$1,932,042	0.4%	Rank history: not on the FY2021–FY2022 lists, #24 in FY2024 and #19 in FY2025; new.
38	Vitalant Top agencies HHS (Department of Health and Human Services)	$1,864,547	0.4%	Rank history: #33 in FY2021, not on the FY2022 list, #36 in FY2024 and not on the FY2025 list; returned.
39	Gannett Fleming Inc. Through GFT Infrastructure, Inc. Top agencies Army (Department of the Army)	$1,793,971	0.3%	Rank history: #34 in FY2021, #45 in FY2022, #79 in FY2024 and not on the FY2025 list; up 6 since FY2022.
40	Ignite Fueling Innovation Inc. Top agencies Army (Department of the Army)	$1,707,483	0.3%	Rank history: not on the FY2021–FY2022 lists, #30 in FY2024 and #25 in FY2025; new.
41	RTX Corporation 2 awardees, including Raytheon Company Top agencies Commerce (Department of Commerce) USAF (Department of the Air Force)	$1,698,433	0.3%	Rank history: not on the FY2021 list, #9 in FY2022 and not on the FY2024–FY2025 lists; down 32 since FY2022.
42	Supply Chain Management & Analysis LLC Top agencies Army (Department of the Army)	$1,532,227	0.3%	Rank history: #79 in FY2021, #42 in FY2022, #41 in FY2024 and not on the FY2025 list; unchanged since FY2022.
43	Sierra Hydrographics Top agencies Army (Department of the Army)	$1,522,116	0.3%	Rank history: #95 in FY2021, #51 in FY2022, #28 in FY2024 and #35 in FY2025; up 8 since FY2022.
44	FI Consulting, Inc. Top agencies Treasury (Department of the Treasury)	$1,519,998	0.3%	Rank history: not on the FY2021–FY2022 lists, #50 in FY2024 and #33 in FY2025; new.
45	CAE Inc. Through CAE USA Mission Solutions Inc. Top agencies Army (Department of the Army)	$1,508,655	0.3%	Rank history: not on the FY2021 list, #48 in FY2022 and not on the FY2024–FY2025 lists; up 3 since FY2022.
46	American Institute In Taiwan Top agencies DOS (Department of State)	$1,500,000	0.3%	Rank history: not on the FY2021–FY2022 lists, #29 in FY2024 and #4 in FY2025; new.
47	Marcia K Beckwith Inc. Top agencies USAF (Department of the Air Force)	$1,479,250	0.3%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
48	Southwest Research Institute Top agencies Commerce (Department of Commerce) NRC (Nuclear Regulatory Commission)	$1,398,471	0.3%	Rank history: #88 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 68 since FY2022.
49	Areli Inc. Top agencies Army (Department of the Army)	$1,372,990	0.3%	Rank history: not on the FY2021–FY2022 lists, #81 in FY2024 and not on the FY2025 list; new.
50	Guidehouse Inc. Top agencies DOT (Department of Transportation)	$1,361,826	0.3%	Rank history: #85 in FY2021, #47 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
51	Science Applications International Corporation Through Engility Services, LLC Top agencies DOT (Department of Transportation)	$1,307,088	0.3%	Rank history: #36 in FY2021, #76 in FY2022 and not on the FY2024–FY2025 lists; up 25 since FY2022.
52	Boudreau Associates LLC Top agencies Army (Department of the Army)	$1,303,931	0.3%	Rank history: #41 in FY2021, #52 in FY2022, #51 in FY2024 and #32 in FY2025; unchanged since FY2022.
53	Paragon Professional Services LLC Top agencies Army (Department of the Army)	$1,273,892	0.2%	Rank history: #23 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 147 since FY2022.
54	The Chenega Corporation Through Chenega Analytic Business Solutions, LLC Top agencies Army (Department of the Army)	$1,235,443	0.2%	Rank history: #16 in FY2021, #20 in FY2022 and not on the FY2024–FY2025 lists; down 34 since FY2022.
55	Anthrotech Inc. Top agencies Navy (Department of the Navy)	$1,207,812	0.2%	Rank history: not on the FY2021–FY2022 lists, #43 in FY2024 and #48 in FY2025; new.
56	General Atomics Top agencies Commerce (Department of Commerce)	$1,200,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
57	The Regents of the University of Colorado Top agencies Commerce (Department of Commerce)	$1,200,000	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
58	Beautiful Environmental Construction Co., Ltd. Top agencies USAF (Department of the Air Force) Army (Department of the Army)	$1,173,032	0.2%	Rank history: not on the FY2021–FY2022 lists, #64 in FY2024 and #67 in FY2025; up 106 since FY2022.
59	ICF International, Inc. 2 awardees, including ICF Incorporated, L.L.C. and ICF Macro Inc. Top agencies DOI (Department of the Interior) DOL (Department of Labor) NSF (National Science Foundation)	$1,146,072	0.2%	Rank history: #20 in FY2021, #98 in FY2022 and not on the FY2024–FY2025 lists; up 39 since FY2022.
60	The Urban Institute Top agencies DOL (Department of Labor) Treasury (Department of the Treasury)	$1,123,668	0.2%	Rank history: not on the FY2021–FY2022 lists, #66 in FY2024 and #52 in FY2025; new.
61	Calibre Systems Inc. Top agencies Army (Department of the Army)	$1,108,965	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
62	Claxton Logistics Services LLC Top agencies Army (Department of the Army)	$1,102,130	0.2%	Rank history: #51 in FY2021, #58 in FY2022, #55 in FY2024 and not on the FY2025 list; down 4 since FY2022.
63	Infopact, Inc. Top agencies USDA (Department of Agriculture)	$1,099,992	0.2%	Rank history: not on the FY2021–FY2022 lists, #56 in FY2024 and not on the FY2025 list; new.
64	The American National Red Cross Top agencies HHS (Department of Health and Human Services)	$1,099,381	0.2%	Rank history: #50 in FY2021, #57 in FY2022, #53 in FY2024 and not on the FY2025 list; down 7 since FY2022.
65	American Institutes for Research In the Behavioral Sciences Top agencies HHS (Department of Health and Human Services) NSF (National Science Foundation)	$1,094,304	0.2%	Rank history: #46 in FY2021, #43 in FY2022, #60 in FY2024 and #40 in FY2025; down 22 since FY2022.
66	Wake Forest University Through Wake Forest University Health Sciences Top agencies DOT (Department of Transportation)	$1,073,594	0.2%	Rank history: not on the FY2021–FY2022 lists, #94 in FY2024 and not on the FY2025 list; up 65 since FY2022.
67	Accenture Inc. Through Accenture Federal Services LLC Top agencies HHS (Department of Health and Human Services)	$989,117	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
68	Gulf South Research Corp Top agencies Army (Department of the Army)	$926,951	0.2%	Rank history: not on the FY2021–FY2022 lists, #87 in FY2024 and not on the FY2025 list; new.
69	National Opinion Research Center Top agencies NSF (National Science Foundation)	$879,249	0.2%	Rank history: not on the FY2021 list, #53 in FY2022, #27 in FY2024 and #21 in FY2025; down 16 since FY2022.
70	Mckinsey & Company, Inc. Through Mckinsey & Company, Inc. Washington D.c. Top agencies PBGC (Pension Benefit Guaranty Corporation)	$853,000	0.2%	Rank history: not on the FY2021–FY2022 lists, #12 in FY2024 and not on the FY2025 list; new.
71	AON Global Limited Through Inpoint, Inc. Top agencies Treasury (Department of the Treasury)	$830,400	0.2%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
72	New York Genome Center, Inc. Top agencies HHS (Department of Health and Human Services)	$742,360	0.1%	Rank history: #15 in FY2021, not on the FY2022 list, #15 in FY2024 and #29 in FY2025; returned.
73	K Watson Group LLC Top agencies USDA (Department of Agriculture)	$742,200	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
74	Navanti Group LLC Top agencies USSOCOM (United States Special Operations Command) WHS (DOD Washington Headquarters Service) DLA (Defense Logistics Agency)	$720,100	0.1%	Rank history: not on the FY2021 list, #90 in FY2022, not on the FY2024 list and #90 in FY2025; up 16 since FY2022.
75	Virginia Commonwealth University Through Virginia Polytechnic Institute & State University Top agencies DOT (Department of Transportation)	$701,367	0.1%	Rank history: not on the FY2021–FY2022 lists, #70 in FY2024 and #47 in FY2025; new.
76	Oneida Nation Through Sustainment & Restoration Services, LLC Top agencies Army (Department of the Army)	$701,157	0.1%	Rank history: #61 in FY2021, #71 in FY2022 and not on the FY2024–FY2025 lists; down 5 since FY2022.
77	Diamondback Manufacturing LLC Top agencies DOS (Department of State)	$684,579	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
78	KCG Engineering Group, Inc. Top agencies Navy (Department of the Navy)	$671,400	0.1%	Rank history: #62 in FY2021, #82 in FY2022, #65 in FY2024 and #55 in FY2025; up 4 since FY2022.
79	Nexight Group LLC Top agencies HHS (Department of Health and Human Services)	$663,005	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
80	Parsons Corporation Through Parsons Government Services Inc. Top agencies Navy (Department of the Navy)	$659,695	0.1%	Rank history: #73 in FY2021, not on the FY2022 list, #68 in FY2024 and #46 in FY2025; up 105 since FY2022.
81	First Environment Inc. Top agencies Army (Department of the Army)	$628,510	0.1%	Rank history: #24 in FY2021, #64 in FY2022, #22 in FY2024 and #22 in FY2025; down 17 since FY2022.
82	Onaka Gumi Co.,Ltd. Top agencies Army (Department of the Army)	$621,440	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
83	Fedwriters, Inc. Top agencies DHS (Department of Homeland Security) DOJ (Department of Justice)	$605,174	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #99 in FY2025; new.
84	H-Plus ECO Ltd. Top agencies Army (Department of the Army) USAF (Department of the Air Force)	$599,400	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #84 in FY2025; new.
85	Kane Environmental Inc Top agencies Navy (Department of the Navy)	$586,813	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
86	Purvis Systems Inc. Top agencies Navy (Department of the Navy)	$570,463	0.1%	Rank history: #68 in FY2021, #74 in FY2022 and not on the FY2024–FY2025 lists; down 12 since FY2022.
87	Pueo Business Solutions LLC Top agencies DOD (Department of Defense)	$556,762	0.1%	Rank history: not on the FY2021 list, #79 in FY2022, #74 in FY2024 and #49 in FY2025; down 8 since FY2022.
88	Statistical Research Inc. Top agencies DOI (Department of the Interior)	$514,035	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; up 157 since FY2022.
89	Trustees of Boston University 2 awardees Top agencies VA (Department of Veterans Affairs)	$503,605	0.1%	Rank history: not on the FY2021 list, #85 in FY2022, #85 in FY2024 and #59 in FY2025; down 4 since FY2022.
90	Facility Engineering Associates, P.C. Top agencies DOI (Department of the Interior)	$498,375	0.1%	Rank history: #74 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 36 since FY2022.
91	Applied Curiosity Research, LLC Top agencies USDA (Department of Agriculture)	$470,255	0.1%	Rank history: not on the FY2021–FY2022 lists and not on the FY2024–FY2025 lists; new.
92	Bosque Ecosystem Monitoring Program Top agencies Army (Department of the Army)	$462,177	0.1%	Rank history: not on the FY2021 list, #89 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
93	Strategic Enterprise Support Services LLC Top agencies USSOCOM (United States Special Operations Command)	$459,567	0.1%	Rank history: #89 in FY2021, #97 in FY2022, #83 in FY2024 and not on the FY2025 list; up 4 since FY2022.
94	Enviroquest Inc. Top agencies Army (Department of the Army)	$446,122	0.1%	Rank history: not on the FY2021 list, #91 in FY2022 and not on the FY2024–FY2025 lists; down 3 since FY2022.
95	Centralpoint EOOD Top agencies WHS (DOD Washington Headquarters Service) DLA (Defense Logistics Agency) USAF (Department of the Air Force)	$439,000	0.1%	Rank history: #94 in FY2021, not on the FY2022 list and not on the FY2024–FY2025 lists; up 39 since FY2022.
96	Bethel-Bem Solutions JV Top agencies Army (Department of the Army)	$428,285	0.1%	Rank history: #78 in FY2021, #77 in FY2022 and not on the FY2024–FY2025 lists; down 19 since FY2022.
97	Institute for Defense Analyses Top agencies Commerce (Department of Commerce)	$400,000	0.1%	Rank history: #56 in FY2021, #69 in FY2022 and not on the FY2024–FY2025 lists; down 28 since FY2022.
98	Press Ganey Associates Inc Top agencies VA (Department of Veterans Affairs)	$396,059	0.1%	Rank history: not on the FY2021 list, #80 in FY2022 and not on the FY2024–FY2025 lists; down 18 since FY2022.
99	Bryce Space and Technology, LLC Top agencies NASA (National Aeronautics and Space Administration)	$395,000	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #42 in FY2025; new.
100	Metropolitan Architects and Planners, Inc. Top agencies EPA (Environmental Protection Agency)	$375,467	0.1%	Rank history: not on the FY2021–FY2022 lists, not on the FY2024 list and #88 in FY2025; new.

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 $516 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