Fleet Intelligence

Technical Managers

The operator view of the ships whose technical manager we have mapped — who runs the vessel, distinct from its registered owner. The technical manager (the DOC holder / operator) is the entity a port-state-control detention or a marine casualty reflects on operationally. This is a partial catalogue: the manager link is known for only a small share of the fleet, so read the leaderboard as the largest managers we've mapped, not a global manager ranking.

The mapped operator market is steeply top-heavy: the five largest technical managers run 63% of the 10.3M dwt of catalogued managed tonnage, while the median manager on this board runs just 3 vessels. Of the 120 managers mapped, 37 carry at least one detention, casualty or AIS-gap signal.

120

managers catalogued

Top technical managers by managed tonnage

Among the 565 ships (0.8% of the fleet) whose technical manager we've mapped — not a global ranking.

M DWT

Fleet AnalyticsSnapshot · 27 Aug 2026

Managers catalogued

120

with ≥1 managed vessel

Managed vessels

565

0.8% of the 73,307-ship catalogue

Managed tonnage

10.3M dwt

sum of managed fleets

Flagged managers

≥1 detention, casualty or AIS-gap signal

How concentrated the managed tonnage is

Cumulative share of catalogued managed tonnage as managers are added largest-first — the shape the top-ranked bar above truncates away. A steep rise into a long flat tail is a top-heavy board: a few operators hold most of the tonnage while dozens run only a handful of ships.

Just 4 of the 63 managers with recorded tonnage hold half of it, and 11 hold four-fifths — the curve then flattens into the long tail of small operators, where the median manager on the board runs just 3 vessels.

Largest managers by managed fleet

Showing 100 of 100 managers. Detention and casualty counts are over the IMO-matched managed fleet.

Only flagged

Detentions concentrate off the tonnage ranking: the three most-detained operators account for 11 of the 32 recorded port-state detentions, and the top five for half. Intensity does not track size — Mediterranean Shipping Company logs 0.22 and Pacific Basin Shipping Limited 0.20 detentions per matched vessel, while the largest fleet on the board (48) records none.

#	Manager	Focus	Managed	DWT	Avg age	PSC detentions	Casualties	AIS-gap
1	Caledonian MacBrayne	Other	48	18K	25.7 yr	0	2	12
2	CPO Containerschiffreederei	Container ships	33	1.3M	17.8 yr	2	1	11
3	ARKAS Line	Container ships	26	338K	23.1 yr	0	0	2
4	Mediterranean Shipping Company	Container ships	23	1.2M	14.9 yr	5	1	4
5	Evergreen Marine	Other	20	199K	7.0 yr	0	0	0
6	Waxholmsbolaget	Other	18	726	34.2 yr	0	0	1
7	Rostein	Other	17	31K	12.2 yr	0	0	0
8	Norled	Other	17	0	—	0	0	0
9	Ocean Network Express	Container ships	15	954K	7.2 yr	0	1	6
10	Pacific Basin Shipping Limited	Bulkers	15	602K	17.1 yr	3	0	9
11	Finnlines	Other	15	91K	14.8 yr	0	0	0
12	Wilhelmsen Ahrenkiel Ship Management	Other	14	238K	18.9 yr	0	0	2
13	HMM	Container ships	13	2.4M	6.0 yr	1	0	6
14	United States Coast Guard	Other	13	0	—	0	1	0
15	Reederei Nord	Bulkers	10	338K	15.5 yr	1	1	4
16	Terntank	Tankers	10	130K	16.6 yr	0	0	4
17	Sloman Neptun Schiffahrts-Aktiengesellschaft	Other	10	13K	14.0 yr	1	0	1
18	Nippon Yusen	Other	9	229K	17.0 yr	1	0	4
19	Misje Rederi	Other	9	35K	31.6 yr	3	0	3
20	Nedlloyd	Other	7	29K	48.0 yr	0	0	0
21	Njord Offshore	Other	7	0	—	0	0	0
22	Scorpio Bulkers	Bulkers	6	368K	10.3 yr	0	0	2
23	Hagland Shipping	Other	6	25K	22.5 yr	0	0	0
24	TT-Line	Other	6	7K	25.0 yr	1	0	0
25	Hardanger Sunnhordlandske Dampskipsselskap	Other	6	797	33.0 yr	0	0	0
26	Viking Line	Other	5	19K	11.0 yr	0	0	0
27	Egil Ulvan Rederi	Other	5	11K	17.6 yr	0	0	0
28	Isle of Man Steam Packet Company	Other	5	10K	28.0 yr	0	0	0
29	Genco Shipping & Trading	Bulkers	4	352K	18.5 yr	2	0	3
30	Tomini Shipping	Bulkers	4	241K	12.4 yr	1	0	2
31	Ciner Shipping	Bulkers	4	178K	13.9 yr	2	0	1
32	Campbell Shipping	Bulkers	4	144K	14.1 yr	3	0	2
33	Wisdom Marine Group	Other	4	117K	10.6 yr	0	0	1
34	Odyssea Marine	Other	4	17K	18.1 yr	0	0	1
35	Molslinjen	Other	4	5K	8.0 yr	0	0	0
36	Otto Wulf	Other	4	3K	17.0 yr	0	0	0
37	Royal TESO	Other	4	0	—	0	0	0
38	Hamburg-Amerikanische-Packetfahrt-Actien-Gesellschaft	Other	4	0	—	0	0	0
39	Union-Castle Line	Other	4	0	—	0	0	0
40	Adler-Schiffe	Other	4	0	—	0	0	0
41	Svitzer	Other	4	0	—	0	0	0
42	Seatrade	Container ships	3	32K	9.7 yr	0	0	0
43	Messina Line	Other	3	22K	27.0 yr	0	0	0
44	Fjord Line	Other	3	8K	12.5 yr	0	0	0
45	Alba Tankers Aalborg	Tankers	3	7K	20.5 yr	0	0	1
46	Bourbon Offshore Norway	Other	3	4K	10.0 yr	0	0	0
47	FRS	Other	3	83	57.0 yr	1	0	0
48	Havila Kystruten	Other	3	0	—	0	0	0
49	Napier	Other	3	0	7.0 yr	0	0	0
50	Jahre Line	Other	3	0	—	0	0	0
51	Izu Shoto Kaihatsu	Other	3	0	—	0	0	0
52	Orient Steam Navigation Company	Other	3	0	—	0	0	0
53	White Star Line	Other	3	0	—	0	0	0
54	Maestro Shipping	Bulkers	2	77K	8.4 yr	0	0	1
55	Arklow Shipping	Bulkers	2	70K	12.5 yr	0	0	1
56	Navigation Maritime Bulgare	Other	2	32K	4.0 yr	0	1	1
57	Silja Line	Other	2	10K	24.8 yr	0	0	0
58	North Sea Shipping	Other	2	9K	12.0 yr	0	0	0
59	Amasus Shipping	Other	2	7K	12.2 yr	0	0	0
60	Swire Seabed	Other	2	6K	12.0 yr	0	0	1
61	Polferries	Other	2	5K	45.0 yr	2	0	1
62	Norwegian America Line	Other	2	560	103.0 yr	0	0	0
63	Norddeutscher Lloyd	Other	2	0	—	0	0	0
64	Bugsier-, Reederei- und Bergungsgesellschaft	Other	2	0	—	0	0	0
65	United States Lines	Other	2	0	—	0	0	0
66	Royal Rotterdam Lloyd	Other	2	0	—	0	0	0
67	Western Towboat Company	Other	2	0	—	0	0	0
68	Caledonian Steam Packet Company	Other	2	0	—	0	0	0
69	BOA Offshore	Other	2	0	—	0	0	0
70	Vesteraalens Dampskibsselskab	Other	2	0	—	0	0	0
71	Far Eastern Shipping Company	Other	2	0	—	2	0	0
72	Blue Funnel Line	Other	2	0	—	0	0	0
73	Greek Line	Other	2	0	—	0	0	0
74	Zim Integrated Shipping Services Ltd	Other	2	0	—	0	0	0
75	Det Nordenfjeldske Dampskibsselskab	Other	2	0	—	0	0	0
76	Global Ship Lease	Container ships	1	105K	22.0 yr	0	0	0
77	J. Ludwig Mowinckels Rederi	Bulkers	1	59K	14.0 yr	0	0	1
78	Berge Bulk	Bulkers	1	35K	11.0 yr	0	0	1
79	Wallenius Wilhelmsen	Other	1	27K	16.0 yr	0	0	1
80	EUKOR Car Carriers	Other	1	22K	17.0 yr	0	0	0
81	CG Railway	Other	1	13K	44.0 yr	1	0	0
82	Canada Steamship Lines	Bulkers	1	9K	48.0 yr	0	1	0
83	Royal Arctic Line	Container ships	1	9K	21.0 yr	0	0	0
84	Sea-Cargo	Other	1	9K	29.0 yr	0	0	0
85	Rederij Wessels	Other	1	4K	28.0 yr	0	0	0
86	China-Japan International Ferry Co., Ltd.	Other	1	4K	32.0 yr	0	0	0
87	Wasa Line	Other	1	4K	5.0 yr	0	0	0
88	Rederi AB Slite	Other	1	3K	37.0 yr	0	0	0
89	Seistar Holding	Other	1	900	7.0 yr	0	0	0
90	Thermo Service	Other	1	340	6.0 yr	0	0	0
91	Rederi AB Svea	Other	1	0	—	0	0	0
92	Glen Line	Other	1	0	—	0	0	0
93	Hamburg Atlantic Line	Other	1	0	—	0	0	0
94	Ems	Other	1	0	—	0	0	0
95	ALP Maritime Services	Other	1	0	—	0	0	0
96	Shinshin Kisen	Other	1	0	—	0	0	0
97	Ofotens og Vesteraalens Dampskibsselskab	Other	1	0	—	0	0	0
98	Ogasawara Kaiun	Other	1	0	—	0	0	0
99	Government ships of the Netherlands	Other	1	0	—	0	0	0
100	Vereenigde Nederlandsche Scheepvaartmaatschappij	Other	1	0	—	0	0	0

Method & caveats

Manager ≠ owner. This page keys on each vessel's technical manager (the DOC holder / operator, an organization), not its registered owner. The two are often different companies — the manager is the entity a detention or casualty reflects on operationally. The registered-owner market structure is on the owner-concentration page.
Managed fleet is the count of active (non-deleted) vessels we attribute to each manager — the denominator for the structural figures.
Detention & casualty counts come from open port-state-control records and serious / critical marine-casualty investigations, matched to the managed fleet by IMO number. The per-vessel rate (shown on hover) uses the IMO-matched managed fleet as its denominator, so it is not diluted by ships we could not match.
AIS-gap counts managed vessels carrying an active AIS-gap or flag-hop signal from our own transparent detectors — a sanctions-evasion behavioural marker, not a sanctions listing.
Average age is deadweight-weighted (broker convention), shown as “—” for fleets with no positive-DWT vessel (e.g. domestic ferry operators).
Coverage caveat: manager attribution is populated for a minority of the fleet, and the safety feeds key on IMO, so a manager with zero detentions may simply be one whose ships we have not matched. This is a known-managed-fleet read, not a clean bill of health — stated, not hidden.
Segments are bulkers, tankers, container ships, gas carriers and other. Derived entirely from data already in the platform plus open government port-state-control and marine-casualty records. No third-party rating is reproduced.