NewLead Holdings has boosted operating revenue generated by its bitumen tankers and wants to grow this sector further.

The Michael Zolotas-led company posted revenue of $15.7m in 2015, compared to $1.35m in 2014, thanks to vessel additions.

And operating consistently at a level above operating expenses, NewLead aims to expand its bitumen business.

Chief executive Michael Zolotas said: “NewLead’s chartering policy will continue to be adaptive to market conditions and allow a combination of long-term time charter contracts, contracts of affreightment (COAs) and spot charter.

“NewLead