Top container fleets by operator
Container fleets grouped by the company responsible for their operation (DoC holder), with their verified CO₂ footprint of the latest reporting year.
Verified data reported under the EU MRV regulation (source: EMSA / THETIS-MRV).
| # | Company | Ships | CO₂ 2025 (Mt) |
|---|---|---|---|
| 1 | MSC — Mediterranean Shipping Company | 602 | 12.24 |
| 2 | CMA CGM | 222 | 4.58 |
| 3 | Maersk | 197 | 6.68 |
| 4 | Seaspan Ship Management Ltd. | 87 | 1.60 |
| 5 | Hapag-Lloyd | 63 | 2.10 |
| 6 | COSCO Shipping | 51 | 2.54 |
| 7 | Technomar Shipping Inc-lib | 47 | 1.01 |
| 8 | HMM | 43 | 0.83 |
| 9 | Evergreen Marine | 37 | 1.62 |
| 10 | Anglo-eastern (germany) Gmbh | 34 | 0.67 |
| 11 | Arkas Denizcilik Ve Nakliyat A.s. | 34 | 0.28 |
| 12 | Danaos Shipping Co Ltd | 30 | 0.36 |
| 13 | Ocean Network Express (ONE) | 29 | 0.78 |
| 14 | OOCL | 28 | 1.29 |
| 15 | Okyanus Ege Denizcilik Ticaret A.s. | 27 | 0.07 |
| 16 | Peter Dohle Schiffahrts-kg | 23 | 0.63 |
| 17 | Conbulk Shipmanagement Corporation | 22 | 0.18 |
| 18 | Contships Management Inc. | 21 | 0.17 |
| 19 | Zodiac Maritime Ltd | 21 | 0.74 |
| 20 | Eastaway Ship Management Pte. Ltd. | 20 | 0.20 |
How these fleets compare
The 20 fleets above operate a combined 1,638 tracked vessels responsible for roughly 38.6 million tonnes of CO2 — led by MSC — Mediterranean Shipping Company, whose 602 ships alone account for 37% of that combined fleet.
Frequently asked questions
What counts as a 'fleet' in this ranking?
A fleet groups every vessel operated or commercially controlled by the same shipping company or beneficial owner, aggregating their individual ship counts and CO2 emissions into one operator-level view.
Why does ship count not always match CO2 output?
Larger vessels emit more per ship but can be more fuel-efficient per TEU carried, so a fleet with fewer, larger ships can emit more — or less — total CO2 than a fleet with more, smaller vessels; the CO2 column reflects total fleet output, not per-ship efficiency.
How does this differ from the carrier rankings?
The carrier rankings compare shipping companies across 17 business criteria (size, coverage, environmental impact); this fleet view focuses specifically on vessel-level ship counts and CO2 totals.