Global Maritime Companies Ranking by
CO2 Emissions (WtW)
Discover the world's largest shipping companies ranked by CO2 emissions (WtW), updated for 2025. Our comprehensive analysis covers major global carriers and their CO2 emissions.
Total Companies Analyzed
Combined Fleet Size
Global TEU Capacity
Top 3 Maritime Companies with the highest CO2 emissions (WtW)
The podium below showcases the three largest shipping companies globally based on CO2 emissions (Well-to-Wake). These industry leaders represent the companies with the highest environmental impact in terms of carbon emissions.
Understanding Maritime Rankings
Key Ranking Criteria
CO2 Emissions (WtW)
Primary FactorCO2 emissions (WtW) is the central metric in our ranking system. It refers to the total CO2 emissions of a company. This factor best represents operational capacity, shipping network reach, and investment scale. A larger fleet not only increases route flexibility but also enhances reliability, resilience, and service frequency across global trade lanes.
Our Methodology
Data Collection
The ranking process begins with data collection, gathering verified information from company financial reports, maritime industry associations, and trusted shipping databases.
Verification
Once collected, every data point undergoes a verification process where it is cross-referenced with multiple independent sources to confirm accuracy.
Analysis
The next stage is analysis, where companies are ranked mainly by CO2 emissions (WtW).
Quarterly Updates
Finally, our rankings are updated quarterly, ensuring they reflect the latest changes, including new vessel acquisitions, fleet reductions, mergers, and operational shifts.
Why CO2 Emissions (WtW) Matters in Shipping Rankings
CO2 emissions (WtW) is more than a number—it indicates strategic commitment, investment capacity, and global competitiveness.
Operational Efficiency
CO2 emissions (WtW) is a key indicator of a company's operational efficiency and environmental responsibility.
Environmental Responsibility
CO2 emissions (WtW) is a key indicator of a company's environmental responsibility and sustainability efforts.
Global Reach
CO2 emissions (WtW) is a key indicator of a company's global reach and its ability to operate across different regions and trade lanes.
Global Maritime Companies Ranking by CO2 Emissions (WtW)
The comprehensive table below ranks the world's leading maritime shipping companies based on their CO2 emissions (Well-to-Wake). Additional metrics such as vessel count, distance traveled, and total voyages provide further context on each company's environmental impact.
| Rank | Company | CO2 Emissions (tonnes) |
|---|---|---|
| 1 |  | 1602635 |
| 2 |  | 400761 |
| 3 |  | 34168 |
| 4 |  | 33046 |
| 5 |  | 16655 |
| 6 |  | 11410 |
| 7 |  | 10271 |
| 8 |  | 10063 |
| 9 |  | 9537.459 |
| 10 |  | 7018 |
ranking_co2_emissions_wtw.Global Shipping Industry Insights
Carrier distribution by CO2 Emissions (WtW)
Source: Seadex aggregated data, 2026
Industry concentration & trends
The top 10 carriers represent 97.8% of the global metric across 41 companies.
Average value across the 41 carriers tracked in our database.
Combined value across all carriers with available data.
Source: Seadex aggregated data, 2026
ranking_co2_emissions_wtw.Regional Distribution & Leadership in Global Shipping
Asia-Pacific Dominance
The Asia-Pacific region dominates the global maritime sector, with companies from China, Japan, South Korea, and Taiwan accounting for over 60% of the world's top 20 shipping lines by fleet size.
- China's COSCO Shipping notably grew its fleet by 15% in the past year, driven by robust trade demand
- This regional strength reflects Asia's role as the hub of global manufacturing and maritime trade
European Maritime Tradition
European shipping lines continue to be key players in the industry.
- Countries like Switzerland, Denmark, Germany, and France are well represented in the top 10 global rankings
- MSC (Mediterranean Shipping Company), based in Switzerland, has surpassed Maersk as the largest container shipping company in the world, underlining Europe's continued strategic presence in maritime logistics
Frequently Asked Questions
How are maritime companies ranked in this list?
How often is the maritime companies ranking updated?
What is CO2 emissions (WtW) and why is it important in shipping?
Why has MSC overtaken Maersk as the world's largest shipping company?
How has the COVID-19 pandemic affected maritime shipping rankings?
What role do alliances play in the maritime shipping industry?
Explore Other Rankings
Fleet Size
Ranking by number of ships
Compare shipping companies based on the total number of vessels in their fleet
View Fleet Size rankingVolume Transported
Ranking by million TEU transported
See which shipping companies move the largest volume of containers globally
View Volume Transported rankingFleet Capacity
Ranking by container fleet capacity (M TEU)
Compare the total carrying capacity of shipping company fleets worldwide
View Fleet Capacity rankingPorts Coverage
Ranking by number of covered ports
Compare shipping companies based on their global port coverage and network reach
View Ports Coverage rankingGlobal Presence
Ranking by presence in number of countries
See which shipping companies have the widest global footprint across different countries
View Global Presence rankingMaritime Routes
Ranking by number of maritime lines
Discover which companies offer the most extensive network of maritime shipping routes
View Maritime routes rankingEnergy Efficiency
Ranking by EEDI (gCO2 per TEUkm)
Compare the Energy Efficiency Design Index of different shipping companie.
View Energy Efficiency rankingOperational Efficiency
Ranking by annual CO2 reduction (EEOI)
See which companies are improving their Energy Efficiency Operational Indicator the fastest
View Operational Efficiency rankingContainer Safety
Ranking by containers lost (% of moved TEU)
Compare companies based on their container safety record and loss prevention
View Container Safety rankingTotal Emissions Reduction
Ranking by annual CO2 reduction (total operations)
See which companies are reducing their total carbon footprint the fastest
View Total Emissions Reduction rankingFleet Emissions Reduction
Ranking by annual CO2 reduction (fleet only)
Compare companies based on how quickly they re reducing their fleet emissions
View Fleet Emissions Reduction rankingAlternative Fuels
Ranking by fleet % using biofuels or dual-fuel engines
Discover which companies are leading in the adoption of cleaner fuel technologies
View Alternative Fuels rankingFleet Emissions
Total fleet emissions (ktons CO2eq, Scope 1)
Compare the absolute emissions from shipping fleets without adjusting for company size
View Fleet Emissions rankingTotal Company Emissions
Total company emissions (ktons CO2eq)
See the total carbon footprint of shipping companies including all operations
View Total Company Emissions rankingCO2 Emissions (WtW)
Ranking by CO2 emissions (Well-to-Wake)
Compare the lifecycle CO2 emissions of shipping companies from fuel production to vessel operation
View CO2 Emissions (WtW) rankingAnnual CO2 Reduction (Scope 1)
Ranking by annual % CO2 reduction (Scope 1)
Track which shipping companies are achieving the fastest annual reduction in direct CO2 emissions
View Annual CO2 Reduction (Scope 1) rankingAnnual Revenue
Ranking by annual revenue (USD bn)
Compare shipping companies based on their annual revenue and market share
View Annual Revenue rankingBrowse carriers by region
See top carriers operating in a specific region — from intra-Asia services to transatlantic players.
Browse carriers by HQ country
Discover the leading shipping companies headquartered in each major maritime nation.