Jacob Rees-Mogg’s business partner, a string of Brexit backers and the wife of a former senior minister to President Putin are among the Conservative donors who have paid more than £7m to socialise with Theresa May since the general election.

Eighty-one party benefactors have paid a total of £7.4m to the Conservative party for access to the prime minister at dinners, post-prime minister’s questions’ lunches and drinks receptions since July 2017, records show.

Party insiders say the large amount raised over just nine months from a single revenue stream is evidence that the Tories are aiming to be “election ready” for the autumn.

At least 10 of the donors, who joined the Leader’s Group for £50,000 a head, are supporters of a hard Brexit.

Dominic Johnson, who attended two of the group’s events in 2017, is the co-founder of Somerset Capital Management – an investment firm set up with Rees-Mogg, a hard Brexiter and the chairman of the European Research Group [ERG].

Somerset was recently reported to be warning its clients about “considerable uncertainty” as a result of Brexit, and set up a fund in Ireland, which benefits from EU financial passporting rights.

Sir Michael Hintze, the hedge fund billionaire who gave £100,000 to Vote Leave, is a familiar figure in Conservative circles and attended at least one dinner in 2017 with the prime minister, sources said.

Hardy McLain, a retired US hedge fund manager living in London, attended events in 2017 and 2018. He previously donated £20,000 to the Vote Leave campaign.

It is the first time since July 2017 that any details of dinner guests of May’s Leader’s Group have emerged. Their identities have been quietly released by the Conservatives this week.

Receiving campaign donations is a routine activity for politicians. But each gift carries with it a potential conflict of interest if the prime minister’s policies appear to benefit those who made the donations.

Edmund Truell, who attended dinners in 2017 and 2018, owns a Swiss-listed private equity business called Disruptive Capital, whose mission statement is to “exploit market uncertainty” to generate returns.

Only two women are among the Leader’s Group donors disclosed in the documents.

Lubov Chernukhin, whose husband, Vladimir, was the deputy finance minister of the Russian president, Vladimir Putin, was given access to the prime minister between last July and September. She has given £626,500 to the Tories since 2012, including £160,000 to play tennis with Boris Johnson and £30,000 to dine with the defence secretary, Gavin Williamson.

Alisa Swidler, a US philanthropist and friend of Bill Clinton who has given £336,686 to the party, also attended an event with May.

The party’s chief executive, the mining tycoon Sir Mick Davis, told a meeting of donors in September that the party needed to raise an additional £6m through the parliamentary cycle if it was to win the next general election.

The party spent £18.5m on last year’s election, when the Conservatives lost their working majority, compared with £11m by Labour. Sources told the Guardian the Tories are aiming for a 40% annual increase in the party’s budget – money that will be spent on up to 100 local campaign co-ordinators.

Records show that Lord Ashcroft, the former Conservative party treasurer who gave millions to the party under William Hague’s leadership but stopped donating during Cameron’s premiership, appears to be back in the fold and is a member of May’s leader’s Group. He was joined by the former government adviser and investor in payday loans, Adrian Beecroft.

May appears to bring cabinet members to each event. She was joined by Amber Rudd and the party chairman, Brandon Lewis, at events between the election and the end of September; the chancellor, Philip Hammond, and Boris Johnson, the foreign secretary, accompanied her to Leader’s Group meetings in the autumn; between January and April this year, May was joined by Johnson, Michael Gove, Liam Fox and four other cabinet ministers.

The Conservatives had not updated details of donors who attended events since July 2017. Cameron pledged to release donors’ data following an outcry over the Leader’s Group dinners and whether they were allowing the rich and powerful to buy access to the cabinet.