Global Maritime Companies Ranking by
Fleet Annual CO2 Emissions Scope 1 (ktonsCO2eq)
Discover the world's largest shipping companies ranked by fleet annual CO2 emissions (Scope 1) in ktonsCO2eq, updated for 2025. Our comprehensive analysis covers major global carriers and their direct annual fleet emission levels.
Total Companies Analyzed
Combined Scope 1 Emissions
Year-over-Year Change
Top 3 Maritime Companies by fleet annual Scope 1 CO2 emissions
The podium below showcases the three shipping companies with the highest fleet annual CO2 emissions (Scope 1) measured in ktonsCO2eq. Tracking direct fleet emissions is essential for understanding each carrier's operational carbon footprint.
Understanding Maritime Rankings
Key Ranking Criteria
Fleet Annual CO2 Emissions (Scope 1)
Primary FactorFleet annual CO2 emissions (Scope 1) in ktonsCO2eq is the central metric in our ranking system. It measures the direct greenhouse gas emissions from fuel combustion across a company's operated fleet over one year. This factor provides the most direct view of a carrier's operational environmental impact. Companies with lower Scope 1 emissions relative to their transport work demonstrate superior fuel efficiency and cleaner operations.
Our Methodology
Data Collection
The ranking process begins with data collection, gathering verified Scope 1 fleet emission data from IMO DCS, company sustainability reports, and classification societies.
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 by their fleet annual CO2 emissions (Scope 1) in ktonsCO2eq.
Quarterly Updates
Finally, our rankings are updated quarterly, ensuring they reflect the latest emission measurements from vessel monitoring systems and regulatory filings.
Why Fleet Scope 1 Emissions Matter in Shipping Rankings
Fleet Scope 1 emissions represent the direct carbon output of vessel operations, making them the most tangible measure of a carrier's environmental responsibility.
Operational Accountability
Scope 1 emissions are directly under a company's control, making them the clearest indicator of operational commitment to emission reduction.
CII Compliance
IMO's Carbon Intensity Indicator directly measures Scope 1 efficiency, with ratings affecting vessel operational permits and charter eligibility.
Investor Transparency
ESG investors increasingly focus on Scope 1 emissions as the most reliable measure of a company's direct environmental performance.
Global Maritime Companies Fleet Scope 1 Emissions Ranking
The comprehensive table below ranks the world's leading maritime shipping companies based on their fleet annual CO2 emissions (Scope 1). Additional metrics such as total CO2 reduction and alternative fuel adoption provide further context on each company's decarbonization trajectory.
Global Shipping Industry Insights
Carrier distribution by Fleet Annual CO2 Emissions Scope 1 (ktonsCO2eq)
Source: Seadex aggregated data, 2026
Industry concentration & trends
The top 10 carriers represent 0.0% 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
Regional Distribution & Leadership in Global Shipping
European Scope 1 Leadership
European carriers face direct carbon costs under EU ETS, creating strong incentives to minimize fleet Scope 1 emissions.
- Maersk's methanol-powered vessels achieve significant Scope 1 reductions on European trade routes
- EU monitoring frameworks (MRV) provide the most granular public data on fleet Scope 1 emissions, driving transparency
Asia-Pacific Fleet Efficiency
Asian carriers are focusing on engine efficiency and LNG adoption to reduce fleet Scope 1 emissions while maintaining growth.
- Japanese carriers lead in hybrid propulsion technology, combining conventional engines with battery and wind-assist systems
- South Korean and Chinese new-builds increasingly feature dual-fuel engines designed for lower Scope 1 emissions from day one
Frequently Asked Questions
What are Scope 1 fleet emissions?
How are fleet annual Scope 1 emissions calculated?
How often is this ranking updated?
What is the difference between fleet Scope 1 and total company emissions?
How does vessel age affect Scope 1 emissions?
What technologies reduce fleet Scope 1 emissions?
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.