Constantinos Martinos’s net worth over time
Only dates with a published estimate are shown. Nothing is filled in between. Tap or hover a bar to see the source.
See the numbers as a table
| Date | Estimate | Source |
| 2024 | $2.3 billion | Forbes World's Billionaires List 2024 |
| 2025 | $2.2 billion | Forbes World's Billionaires List 2025 |
| 2026 | $2.2 billion | Forbes World's Billionaires List 2026 |
| Oct 2026 | $2.2 billion | Forbes Real-Time Billionaires · Forbes real-time estimate |
Where the money comes from
These are the main sources of wealth named in the reporting we cite. No published source breaks the total into exact amounts, so we do not show percentages.
Constantinos Martinos’s fortune in real-life terms
Based on the Forbes Real-Time Billionaires estimate above. Median full-time U.S. pay is $65,416 a year ($1,258 a week, BLS, Q2 2026), before taxes. Typical (median) U.S. family net worth is $216,100 (Federal Reserve, 2025 Survey of Consumer Finances).
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Constantinos Martinos has an estimated net worth of $2.2 billion, according to Forbes Real-Time Billionaires, Constantinos Martinos profile (figures as of October 20, 2026). That is down from a peak of $2.3 billion.
Constantinos Martinos is a Greek shipowner best known for Thenamaris, a shipping firm he cofounded in 1972 with his mother and brothers. He built his career in shipping from a young age and became the main figure at the company after his brothers left in 1990 and 1998. Forbes places him in logistics, and his wealth comes from shipping. He is a self-made billionaire, according to Forbes.
Thenamaris owns a large fleet that includes 87 tankers, bulk carriers, container ships and LNG carriers. That scale made Martinos one of the most prominent names in Greek shipping. Forbes says he owns Thenamaris, while the wider Martinos family fleet is the biggest in Greece. His business also spans the next generation. Thenamaris is now run by his son Nikolas, and his other son Ioannis leads Signal Group, a shipping services firm.
How Constantinos Martinos built his fortune
Martinos made his money in shipping. He cofounded Thenamaris in 1972 with his mother and brothers, and the business grew into a major operator with 87 vessels. Its fleet covers several shipping markets, including tankers, bulk carriers, container ships and LNG carriers. That mix gives the company exposure to different kinds of maritime trade, all under the broader logistics industry that Forbes uses for his profile.
A key part of his story is control. His brothers, Athanasios and Andreas, later split away in 1990 and 1998, leaving him with Thenamaris. Forbes also notes that he and his brothers collectively own the largest shipping fleet in Greece. Today the company remains in family hands, with Nikolas Martinos running Thenamaris and Ioannis Martinos heading Signal Group, another business tied to shipping services.
What Forbes says about his wealth
Forbes estimated Martinos at $2.3 billion on its World's Billionaires List in 2024. In later updates, Forbes showed a slightly lower level. By October 20, 2026, Forbes' real-time billionaires tracker put him at $2.2 billion. The available details point back to the same core asset: his ownership of Thenamaris and its large fleet across several vessel categories.
The broader business picture helps explain why shipping is central to his finances. Thenamaris is part of a family network that Forbes says forms the largest shipping fleet in Greece, which is the largest shipowning nation in the world. Martinos is also marked as self-made by Forbes. Even as management has shifted to the next generation, the company he kept after the family splits remains the main source of his wealth.
Career and money timeline
- 1971
His mother founded Thenamaris in 1971.
- 1972
He cofounded Thenamaris with his mother and siblings.
- 1990
His brother Athanasios split off from the business.
- 1998
His brother Andreas also left, leaving him with Thenamaris.
- 2011
Lloyd's List ranked him 67 in shipping influence.
- 2026
Forbes' real-time tracker listed him at $2.2 billion in October 2026.
Constantinos Martinos net worth FAQ
What is Constantinos Martinos's net worth?
Constantinos Martinos's net worth is an estimated $2.2 billion, according to Forbes Real-Time Billionaires, Constantinos Martinos profile (October 20, 2026). It is an estimate, not an official figure.
How did Constantinos Martinos get so rich?
The main sources named in the reporting we cite are: Shipping.
Is Constantinos Martinos a billionaire?
Yes. Forbes Real-Time Billionaires estimates Constantinos Martinos is worth $2.2 billion.
How has Constantinos Martinos's net worth changed?
The earliest published estimate we track is $2.3 billion (2024, Forbes World's Billionaires List 2024). The latest is $2.2 billion (October 20, 2026).
What company is Constantinos Martinos known for?
He is best known for Thenamaris, the Greek shipping company he cofounded in 1972. Forbes says he owns the firm.
What kinds of ships are in Thenamaris' fleet?
Forbes says the fleet has 87 vessels. They include tankers, bulk carriers, container ships and LNG carriers.
Sources
- Forbes Real-Time Billionaires, Constantinos Martinos profile (October 20, 2026)
- Forbes World's Billionaires List 2024, Constantinos Martinos profile (April 2, 2024)
- Forbes World's Billionaires List 2025, Constantinos Martinos profile (April 2025)
- Forbes World's Billionaires List 2026, Constantinos Martinos profile (March 10, 2026)
- U.S. Bureau of Labor Statistics, Usual Weekly Earnings (Q2 2026) (July 2026)
- Federal Reserve, 2025 Survey of Consumer Finances (median family net worth, Table 4) (October 2026)
- Background facts: Wikipedia, Constantinos Martinos (accessed October 25, 2026). Used for career facts only, never for figures.
Every number on this page is an estimate published by the source named next to it. We never fill in years with our own guesses. How we handle estimates.