At least 18 members of BPs international fuel oil trading team have resigned between May and June, prompting the British oil and gas major to begin an investigation.
Reports say a minimum of six fuel oil traders left BP's Singapore office, including BP's global head of fuel oil trading, and four support staff resigned in May.
Later three traders departed the US office and one senior trader from its UK office. A further four more traders from BP Singapore were reported to have left the office in June.
Wounded by the Gulf of Mexico disaster reports say BP has been issuing its trading staff handicapped bonuses and pay cuts, provoking a staff exodus.
BP has been listed as Singapore's largest supplier of bunker fuel by volume in 2009 by the Maritime and Port Authority of Singapore (MPA). The oil major also supplies marine fuel in Hong Kong, China and South Korea.