Top 100 Contractors in NAICS 483: Water Transportation, FY2021

Name: Top 100 Contractors in NAICS 483: Water Transportation, FY2021
Creator: GovTribe

Parent companies by net contract obligations Oct 1, 2020 – Sep 30, 2021 Code page on GovTribe

The top 10 won 59% of FY2021 NAICS 483 contract dollars

Contract obligations: $2,442,485,189 Net of deobligations, by contracts coded NAICS 483 or a code under it
Contractors: 193 Parent companies with an obligation
Largest contractor: Maersk Inc. $371 million, 14.3% 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	Maersk Inc. 4 awardees, including U.s. Marine Management, LLC, Maersk Line, Limited and Farrell Lines Incorporated Top agencies Army (Department of the Army) Navy (Department of the Navy) USAID (US Agency for International Development)	$371,053,397	14.3%	Rank history: #1 in FY2022, #2 in FY2023, #31 in FY2024 and not on the FY2025 list; unchanged since FY2020.
2	Crowley Government Services Inc. 6 awardees, including Crowley Marine Services, Inc. and Crowley Maritime Corporation Top agencies Navy (Department of the Navy) Army (Department of the Army) OSD (Office of the Secretary of Defense)	$272,617,429	10.5%	Rank history: #3 in FY2022, #3 in FY2023, #2 in FY2024 and #2 in FY2025; up 1 since FY2020.
3	Patriot Contract Services, LLC Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense) Army (Department of the Army)	$219,321,876	8.4%	Rank history: #2 in FY2022, #1 in FY2023, #1 in FY2024 and #1 in FY2025; down 1 since FY2020.
4	Saltchuk Resources, Inc. 4 awardees, including Tote Services, LLC, Tote Maritime Puerto Rico, LLC and Tote Maritime Alaska, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) MDA (DOD Missile Defense Agency)	$137,391,796	5.3%	Rank history: #5 in FY2022, #6 in FY2023, #20 in FY2024 and #32 in FY2025; unchanged since FY2020.
5	Liberty Global Logistics LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$110,233,581	4.2%	Rank history: #8 in FY2022, #12 in FY2023 and not on the FY2024–FY2025 lists; up 4 since FY2020.
6	Matson Navigation Company Inc 3 awardees, including Matson Logistics, Inc. Top agencies Army (Department of the Army) Navy (Department of the Navy) DOI (Department of the Interior)	$93,241,558	3.6%	Rank history: #7 in FY2022, #8 in FY2023, #11 in FY2024 and #14 in FY2025; up 1 since FY2020.
7	Ocean Shipholdings, Inc. 2 awardees, including Ocean Ships, Inc. Top agencies Navy (Department of the Navy) MDA (DOD Missile Defense Agency)	$87,776,794	3.4%	Rank history: #4 in FY2022, #4 in FY2023, #4 in FY2024 and #5 in FY2025; down 2 since FY2020.
8	American Roll-on Roll-Off Carrier LLC 2 awardees Top agencies Army (Department of the Army) Navy (Department of the Navy)	$82,762,427	3.2%	Rank history: #12 in FY2022, #7 in FY2023, #3 in FY2024 and #6 in FY2025; unchanged since FY2020.
9	American President Lines Ltd. 2 awardees, including Ceva Freight LLC Top agencies Army (Department of the Army) USAID (US Agency for International Development) DHS (Department of Homeland Security)	$77,555,190	3.0%	Rank history: not on the FY2022–FY2025 lists; down 3 since FY2020.
10	Sealift Holdings Inc. 2 awardees, including Sealift Inc. of Delaware Top agencies Navy (Department of the Navy) Army (Department of the Army) USAID (US Agency for International Development)	$75,208,883	2.9%	Rank history: #16 in FY2022, #14 in FY2023, #10 in FY2024 and #20 in FY2025; up 11 since FY2020.
11	Chas Kurz & Co Inc 2 awardees, including Keystone Shipping Services, Inc. and Keystone Shipping Co Top agencies Navy (Department of the Navy) DOT (Department of Transportation) OSD (Office of the Secretary of Defense)	$71,069,098	2.7%	Rank history: #9 in FY2022, #5 in FY2023, #21 in FY2024 and not on the FY2025 list; up 3 since FY2020.
12	Hornbeck Offshore Services Inc. Through Hornbeck Offshore Operators LLC Top agencies Navy (Department of the Navy)	$65,347,659	2.5%	Rank history: #13 in FY2022, #10 in FY2023, #35 in FY2024 and not on the FY2025 list; up 6 since FY2020.
13	Seacor Holdings Inc. 2 awardees, including Waterman Transport Inc. and Fairwater Tanker Management LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$64,643,205	2.5%	Rank history: not on the FY2022–FY2025 lists; unchanged since FY2020.
14	Ocean Duchess, Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$56,143,842	2.2%	Rank history: #24 in FY2022, #21 in FY2023, #26 in FY2024 and #27 in FY2025; up 3 since FY2020.
15	Dome Chartering & Trading Corp. Through Schuyler Line Navigation Company LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) USAF (Department of the Air Force)	$55,639,453	2.1%	Rank history: #10 in FY2022, #9 in FY2023, #49 in FY2024 and not on the FY2025 list; down 4 since FY2020.
16	American Petroleum Tankers Parent LLC Through American Petroleum Tankers LLC Top agencies Navy (Department of the Navy)	$53,161,184	2.0%	Rank history: #15 in FY2022, #18 in FY2023, #27 in FY2024 and not on the FY2025 list; down 1 since FY2020.
17	CMA CGM Through American President Lines, LLC Top agencies Army (Department of the Army) USAID (US Agency for International Development)	$52,165,367	2.0%	Rank history: #6 in FY2022, #13 in FY2023, #34 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
18	Transoceanic Cable Ship Company LLC 2 awardees Top agencies Navy (Department of the Navy)	$44,059,656	1.7%	Rank history: #21 in FY2022, #22 in FY2023, #9 in FY2024 and #18 in FY2025; up 4 since FY2020.
19	Hapag-Lloyd USA LLC Top agencies Army (Department of the Army)	$36,708,398	1.4%	Rank history: #20 in FY2022, #20 in FY2023, #24 in FY2024 and #24 in FY2025; unchanged since FY2020.
20	US Ocean LLC Top agencies Army (Department of the Army)	$36,170,215	1.4%	Rank history: #19 in FY2022, #16 in FY2023, #16 in FY2024 and #13 in FY2025; up 8 since FY2020.
21	Pacific-Gulf Marine, Inc. Top agencies Navy (Department of the Navy) OSD (Office of the Secretary of Defense)	$33,385,001	1.3%	Rank history: #14 in FY2022, #17 in FY2023, #19 in FY2024 and #25 in FY2025; up 2 since FY2020.
22	Alpha Marine Services LLC Top agencies Navy (Department of the Navy)	$22,570,938	0.9%	Rank history: #26 in FY2022, #23 in FY2023, #23 in FY2024 and #22 in FY2025; up 2 since FY2020.
23	Vane Line Bunkering, LLC Top agencies DLA (Defense Logistics Agency)	$20,924,117	0.8%	Rank history: #25 in FY2022, #27 in FY2023, #30 in FY2024 and #23 in FY2025; down 3 since FY2020.
24	Jar Assets LLC 2 awardees Top agencies DLA (Defense Logistics Agency)	$19,555,282	0.8%	Rank history: #37 in FY2022, #34 in FY2023, #40 in FY2024 and #36 in FY2025; up 13 since FY2020.
25	Offshore Service Vessels, L.L.C. Top agencies Navy (Department of the Navy)	$18,062,801	0.7%	Rank history: #27 in FY2022, #31 in FY2023, #38 in FY2024 and not on the FY2025 list; up 1 since FY2020.
26	Superior Maritime Services, Inc. Top agencies Army (Department of the Army)	$17,385,603	0.7%	Rank history: #29 in FY2022, #25 in FY2023, #29 in FY2024 and #31 in FY2025; up 7 since FY2020.
27	Overseas Shipholding Group Inc. 3 awardees, including OSG Ship Management, Inc., Santorini Tanker LLC and Mykonos Tanker LLC Top agencies Navy (Department of the Navy)	$16,929,374	0.7%	Rank history: #28 in FY2022, #15 in FY2023, #36 in FY2024 and #30 in FY2025; up 34 since FY2020.
28	Asahi Tanker Co.,Ltd. Top agencies Navy (Department of the Navy)	$16,789,232	0.6%	Rank history: #51 in FY2022, #35 in FY2023, #92 in FY2024 and #70 in FY2025; down 1 since FY2020.
29	Patriot Shipping LLC Top agencies Navy (Department of the Navy)	$12,938,445	0.5%	Rank history: #17 in FY2022, #50 in FY2023 and not on the FY2024–FY2025 lists; up 2 since FY2020.
30	Ocean Ships, Inc. Top agencies Navy (Department of the Navy)	$12,524,289	0.5%	Rank history: not on the FY2022–FY2025 lists; up 4 since FY2020.
31	Schuyler Line Navigation Company LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$12,395,106	0.5%	Rank history: #58 in FY2022, not on the FY2023 list, #6 in FY2024 and #8 in FY2025; down 2 since FY2020.
32	Great Eastern Group, Inc. Top agencies Navy (Department of the Navy)	$11,987,187	0.5%	Rank history: #30 in FY2022, #54 in FY2023 and not on the FY2024–FY2025 lists; up 17 since FY2020.
33	JM Ship LLC Top agencies Navy (Department of the Navy) Army (Department of the Army)	$11,437,215	0.4%	Rank history: #67 in FY2022 and not on the FY2023–FY2025 lists; up 12 since FY2020.
34	Seaward Services, Inc. Top agencies Navy (Department of the Navy)	$11,207,356	0.4%	Rank history: #22 in FY2022, #26 in FY2023, #37 in FY2024 and #29 in FY2025; down 2 since FY2020.
35	Liberty Grace Corporation Top agencies USAID (US Agency for International Development)	$10,900,000	0.4%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
36	Omni2Max, Inc. Top agencies Navy (Department of the Navy)	$9,616,464	0.4%	Rank history: #31 in FY2022, #39 in FY2023, #44 in FY2024 and #39 in FY2025; new, not ranked in FY2020.
37	United Ocean Services Inc. Top agencies USAID (US Agency for International Development)	$9,000,000	0.3%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
38	The Pasha Group Through Pasha Hawaii Holdings LLC Top agencies DOT (Department of Transportation) Navy (Department of the Navy) Army (Department of the Army)	$7,855,335	0.3%	Rank history: #32 in FY2022, #30 in FY2023, #48 in FY2024 and not on the FY2025 list; up 46 since FY2020.
39	Sealift Inc. of Delaware Top agencies Navy (Department of the Navy)	$7,851,177	0.3%	Rank history: not on the FY2022–FY2025 lists; down 14 since FY2020.
40	Fishing Vessel North Wind, Inc. Top agencies Commerce (Department of Commerce)	$7,012,755	0.3%	Rank history: #33 in FY2022, #40 in FY2023, #42 in FY2024 and #45 in FY2025; unchanged since FY2020.
41	Curtin Maritime Corp Top agencies Navy (Department of the Navy)	$6,375,393	0.2%	Rank history: #63 in FY2022, #75 in FY2023, #70 in FY2024 and #52 in FY2025; up 26 since FY2020.
42	Dampskibsselskabet Norden A/ Through Norient Product Pool APS Top agencies Navy (Department of the Navy)	$5,822,764	0.2%	Rank history: #23 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
43	Liberty Eagle Corporation Top agencies USAID (US Agency for International Development)	$5,314,244	0.2%	Rank history: not on the FY2022 list, #53 in FY2023, not on the FY2024 list and #51 in FY2025; down 5 since FY2020.
44	Maersk Line, Limited Top agencies Navy (Department of the Navy)	$5,225,520	0.2%	Rank history: not on the FY2022–FY2023 lists, #8 in FY2024 and #17 in FY2025; down 8 since FY2020.
45	Young Brothers LLC Top agencies Army (Department of the Army) DOI (Department of the Interior)	$4,658,523	0.2%	Rank history: #34 in FY2022, #33 in FY2023, #45 in FY2024 and not on the FY2025 list; up 21 since FY2020.
46	Lynden Inc. 2 awardees, including Alaska Marine Lines Inc. Top agencies Army (Department of the Army) DHS (Department of Homeland Security)	$4,438,776	0.2%	Rank history: #38 in FY2022, #45 in FY2023, #56 in FY2024 and #53 in FY2025; up 4 since FY2020.
47	S.d.s. Lumber Co. Top agencies Army (Department of the Army)	$4,355,860	0.2%	Rank history: not on the FY2022–FY2025 lists; up 11 since FY2020.
48	Reliance Bulk Carriers LLC Top agencies USAID (US Agency for International Development)	$3,543,453	0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
49	Hornbeck Offshore Operators LLC Top agencies Navy (Department of the Navy)	$3,412,264	0.1%	Rank history: not on the FY2022–FY2023 lists, #13 in FY2024 and #10 in FY2025; down 39 since FY2020.
50	Northcliffe Ocean Shipping & Trading Company Inc. Top agencies Navy (Department of the Navy) Army (Department of the Army)	$3,389,179	0.1%	Rank history: #48 in FY2022, #70 in FY2023, #54 in FY2024 and #54 in FY2025; up 9 since FY2020.
51	Tote Services, LLC Top agencies Navy (Department of the Navy) Army (Department of the Army) DOT (Department of Transportation)	$3,169,254	0.1%	Rank history: #72 in FY2022, not on the FY2023 list, #5 in FY2024 and #4 in FY2025; new, not ranked in FY2020.
52	Trailer Bridge Inc. Top agencies Army (Department of the Army) USDA (Department of Agriculture)	$3,147,064	0.1%	Rank history: #42 in FY2022, #36 in FY2023, #46 in FY2024 and #49 in FY2025; up 55 since FY2020.
53	United States Seafoods, LLC Top agencies Commerce (Department of Commerce)	$2,927,531	0.1%	Rank history: #49 in FY2022, #56 in FY2023, #67 in FY2024 and #64 in FY2025; up 41 since FY2020.
54	Seabulk International Inc. 2 awardees, including Waterman Transport Inc. and Fairwater Tanker Management LLC Top agencies Army (Department of the Army) Navy (Department of the Navy)	$2,477,466	0.1%	Rank history: #18 in FY2022, #11 in FY2023, #18 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
55	U.s. Marine Management, LLC Top agencies Navy (Department of the Navy)	$2,393,368	0.1%	Rank history: not on the FY2022–FY2023 lists, #7 in FY2024 and #3 in FY2025; down 39 since FY2020.
56	Tankerska Next Generation International Ltd. Top agencies Navy (Department of the Navy)	$2,292,712	0.1%	Rank history: #35 in FY2022, #66 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
57	Hawaii Resource Group LLC Top agencies Commerce (Department of Commerce) DOI (Department of the Interior) Navy (Department of the Navy)	$2,096,617	0.1%	Rank history: #45 in FY2022, #51 in FY2023, #59 in FY2024 and #61 in FY2025; down 4 since FY2020.
58	Bordelon Marine, L.L.C. Top agencies Navy (Department of the Navy)	$1,807,687	0.1%	Rank history: #40 in FY2022 and not on the FY2023–FY2025 lists; down 6 since FY2020.
59	Starfleet Marine Transportation, Inc. Top agencies Navy (Department of the Navy)	$1,667,320	0.1%	Rank history: #54 in FY2022, #58 in FY2023, #72 in FY2024 and #69 in FY2025; up 5 since FY2020.
60	Torm A/S Top agencies Navy (Department of the Navy)	$1,520,000	0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
61	Statue Cruises LLC Top agencies DOI (Department of the Interior)	$1,489,893	0.1%	Rank history: not on the FY2022–FY2025 lists; up 21 since FY2020.
62	Next Generation Logistics, LLC Top agencies Army (Department of the Army)	$1,482,517	0.1%	Rank history: #59 in FY2022, not on the FY2023 list, #76 in FY2024 and not on the FY2025 list; new, not ranked in FY2020.
63	D'Amico Tankers Designated Activity Company Top agencies Navy (Department of the Navy)	$1,246,250	<0.1%	Rank history: #53 in FY2022, #37 in FY2023 and not on the FY2024–FY2025 lists; down 6 since FY2020.
64	Vesteraalen L.l.c Top agencies Commerce (Department of Commerce)	$1,225,260	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 35 since FY2020.
65	Oasis Systems, LLC Top agencies Navy (Department of the Navy)	$1,220,744	<0.1%	Rank history: #60 in FY2022, #83 in FY2023 and not on the FY2024–FY2025 lists; up 11 since FY2020.
66	HDR Marine LLC Top agencies Commerce (Department of Commerce)	$1,058,892	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
67	Cetacean Marine Inc. Top agencies EPA (Environmental Protection Agency)	$1,043,093	<0.1%	Rank history: #43 in FY2022, #44 in FY2023 and not on the FY2024–FY2025 lists; down 24 since FY2020.
68	Smith Maritime Inc. Top agencies Navy (Department of the Navy)	$966,300	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
69	Ceiba Adventures Inc. Top agencies DOI (Department of the Interior)	$944,487	<0.1%	Rank history: #62 in FY2022, #74 in FY2023, #83 in FY2024 and #82 in FY2025; up 10 since FY2020.
70	Vineta Asia PTE. Ltd. Through Macs Maritime Carrier Shipping Pte. Ltd. Top agencies USAID (US Agency for International Development)	$884,812	<0.1%	Rank history: #90 in FY2022 and not on the FY2023–FY2025 lists; up 11 since FY2020.
71	Woods Hole Oceanographic Institution Top agencies DOI (Department of the Interior)	$875,278	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
72	MS. Julie, Inc. Top agencies Commerce (Department of Commerce)	$783,000	<0.1%	Rank history: not on the FY2022 list, #77 in FY2023, not on the FY2024 list and #80 in FY2025; new, not ranked in FY2020.
73	Glencore International PLC Through ST Shipping and Transport Pte. Ltd. Top agencies Navy (Department of the Navy)	$779,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
74	Western Towboat Company Top agencies Navy (Department of the Navy) DHS (Department of Homeland Security)	$770,135	<0.1%	Rank history: not on the FY2022 list, #61 in FY2023, #55 in FY2024 and #63 in FY2025; up 9 since FY2020.
75	Support Vessels of Alaska, Inc. Top agencies Commerce (Department of Commerce)	$711,678	<0.1%	Rank history: #82 in FY2022, not on the FY2023 list, #88 in FY2024 and not on the FY2025 list; up 22 since FY2020.
76	Pacific Maritime Group Inc. Top agencies Navy (Department of the Navy) USSOCOM (United States Special Operations Command)	$686,672	<0.1%	Rank history: #52 in FY2022, #49 in FY2023, #66 in FY2024 and #48 in FY2025; down 13 since FY2020.
77	Cape Henry Launch Service Inc. Top agencies Navy (Department of the Navy)	$666,635	<0.1%	Rank history: #75 in FY2022 and not on the FY2023–FY2025 lists; up 15 since FY2020.
78	C & M Industries, Inc. Top agencies Navy (Department of the Navy)	$665,077	<0.1%	Rank history: #64 in FY2022, #57 in FY2023, #68 in FY2024 and #62 in FY2025; down 7 since FY2020.
79	Scorpio MR Pool Ltd Top agencies Navy (Department of the Navy)	$634,500	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 33 since FY2020.
80	Reederei TMS "Atlantic Mate" GMBH & Co. KG Top agencies Navy (Department of the Navy)	$618,550	<0.1%	Rank history: #61 in FY2022, #48 in FY2023, not on the FY2024 list and #71 in FY2025; down 20 since FY2020.
81	Dunlap Towing Company Top agencies Navy (Department of the Navy)	$563,321	<0.1%	Rank history: #50 in FY2022 and not on the FY2023–FY2025 lists; down 7 since FY2020.
82	Reederei TMS \"Eberhardt Arctic\" GMBH & Co. KG Top agencies Navy (Department of the Navy)	$546,725	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
83	Litasco SA Through Eiger Shipping SA Top agencies Navy (Department of the Navy)	$539,400	<0.1%	Rank history: #65 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
84	Hafnia PTE. Ltd. Through Hafnia Pools Pte. Ltd. Top agencies Navy (Department of the Navy)	$516,206	<0.1%	Rank history: #41 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
85	Portserv International Ltd Top agencies USAID (US Agency for International Development)	$500,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
86	Navigazione Montanari SPA Top agencies Navy (Department of the Navy)	$470,000	<0.1%	Rank history: #36 in FY2022, #62 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
87	Semper Offshore LLC Top agencies Commerce (Department of Commerce)	$456,250	<0.1%	Rank history: #71 in FY2022, #73 in FY2023 and not on the FY2024–FY2025 lists; new, not ranked in FY2020.
88	Minotaur Navigation Company Limited Top agencies Navy (Department of the Navy)	$449,898	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 32 since FY2020.
89	Chantal C, Inc. Top agencies Commerce (Department of Commerce)	$443,400	<0.1%	Rank history: #84 in FY2022, #72 in FY2023, not on the FY2024 list and #81 in FY2025; new, not ranked in FY2020.
90	MLS-Multinational Logistic Services Limited Top agencies DLA (Defense Logistics Agency)	$442,000	<0.1%	Rank history: not on the FY2022–FY2025 lists; down 13 since FY2020.
91	Marquette Transportation Company Holdings, LLC Through Marquette Transportation Company, LLC Top agencies Army (Department of the Army)	$425,850	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 85 since FY2020.
92	Seabridge Inc. Top agencies USAF (Department of the Air Force)	$384,932	<0.1%	Rank history: #97 in FY2022 and not on the FY2023–FY2025 lists; new, not ranked in FY2020.
93	Keystone Shipping Services, Inc. Top agencies Navy (Department of the Navy)	$382,000	<0.1%	Rank history: #73 in FY2022, not on the FY2023 list, #17 in FY2024 and #9 in FY2025; new, not ranked in FY2020.
94	SO. Cal. Ship Services, LLC Top agencies Navy (Department of the Navy)	$289,250	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
95	National Shipping of America, LLC Top agencies Army (Department of the Army)	$287,498	<0.1%	Rank history: #85 in FY2022, #67 in FY2023, #85 in FY2024 and #47 in FY2025; down 23 since FY2020.
96	Segawakisen Co.,Ltd Top agencies Navy (Department of the Navy)	$222,831	<0.1%	Rank history: #91 in FY2022 and not on the FY2023–FY2025 lists; unchanged since FY2020.
97	The Medical Foundation for the Study of the Environment and the Human Body Top agencies DOI (Department of the Interior)	$211,199	<0.1%	Rank history: not on the FY2022–FY2025 lists; up 49 since FY2020.
98	B & N Fisheries Company Top agencies Commerce (Department of Commerce)	$203,018	<0.1%	Rank history: #44 in FY2022, #52 in FY2023, #65 in FY2024 and #58 in FY2025; down 11 since FY2020.
99	MBT Divers Inc. Top agencies DOI (Department of the Interior)	$183,750	<0.1%	Rank history: not on the FY2022–FY2025 lists; new, not ranked in FY2020.
100	BEI Tactical LLC Top agencies USSOCOM (United States Special Operations Command)	$177,990	<0.1%	Rank history: #99 in FY2022 and not on the FY2023–FY2025 lists; up 9 since FY2020.

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100 of 193 contractors listed here. See the rest on GovTribe.

Rankings for the codes under NAICS 483

Code	Net obligations	Largest contractor
4831 Deep Sea, Coastal, and Great Lakes Water Transportation	$2,389,931,973	Maersk Inc.
4832 Inland Water Transportation	$52,553,217	Vane Line Bunkering, LLC

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 $2.6 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 2021 ran Oct 1, 2020 – Sep 30, 2021. 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 FY2020. "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 FY2020 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 483 contractors in FY2021?

1. Maersk Inc. ($371M), 2. Crowley Government Services Inc. ($273M), 3. Patriot Contract Services, LLC ($219M), 4. Saltchuk Resources, Inc. ($137M), 5. Liberty Global Logistics LLC ($110M), 6. Matson Navigation Company Inc ($93.2M), 7. Ocean Shipholdings, Inc. ($87.8M), 8. American Roll-on Roll-Off Carrier LLC ($82.8M), 9. American President Lines Ltd. ($77.6M), 10. Sealift Holdings Inc. ($75.2M).

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