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OSG, based in New York, said Feb. 10 that the pool of 45 supertankers from seven owners in which its carriers trade will no longer go to Iran. Four OSG-owned ships, managed by Tankers International LLC, called at the country’s biggest crude-export terminal in the past year, ship-tracking data compiled by Bloomberg show. Nova Tankers A/S and Frontline, with a combined 93 vessels, said Feb. 9 and 11 they won’t ship Iranian crude.

U.S. and EU leaders are trying to tighten restrictions on business with Iran, which produced 3.55 million barrels of crude a day in January, 11 percent of OPEC’s total, according to data compiled by Bloomberg. Oil sales earned Iran $73 billion in 2010, accounting for about 50 percent of government revenue and 80 percent of exports, the U.S. Energy Department estimates.