Revelation of big donations comes after manifesto promised to build on ‘unprecedented support’ for industry.
Oil executives whose industry is promised further government support if the Conservatives are returned to power have given more than £390,000 to the party since Theresa May became prime minister.
They include Ian Taylor, the chief executive of Vitol, whose firm was fined for making payments to an Iraqi state-owned firm, and Ayman Asfari, the chief executive of Petrofac, who was recently interviewed by the Serious Fraud Office over suspected corruption.
Three of the donors have attended dinners with May or senior ministers since she took office.
The payments will raise eyebrows because the 2017 manifesto includes a specific commitment to build upon previous “unprecedented” government support for the oil and gas industry.
Labour, which compiled the figures, said they exposed a cosy relationship between the prime minister and the oil industry.
A Conservative spokesman said: “All donations to the Conservative party are properly and transparently declared to the Electoral Commission, published by them, and comply fully with the law.”
Labour’s Jon Trickett, the shadow Cabinet Office minister, said: “It’s worrying to think that while Theresa May omitted to mention ‘living standards’ anywhere in the manifesto, she made a number of manifesto pledges to the oil and gas industry – including active support of new oil and gas facilities – after she and her cabinet ministers have been liaising with, and taking money from, the industry’s top bosses.”