Labour lost more than a fifth of its members in the run-up to Sir Keir Starmer's resignation, new data has revealed. Figures released by the Electoral Commission show the party's membership fell from 333,235 in 2024 to 264,754 in 2025.
Donations plummet
It comes as the party slipped behind in opinion polling, and saw a slump in donations over the same period. Donations dropped from £39.4m in 2024 - a year in which there was a general election - to £6.5m in 2025, a fall of almost 84%.
Other parties fare better
Other political parties fared better. Reform UK said it had around 270,000 members, while the Green Party - Labour's rivals on the left - saw a significant rise in support since Zack Polanski became leader. Green Party membership quadrupled since 2025, standing at 186,441 at the end of the year.
A Green Party spokesperson told the Daily Express: "The green party has quadrupled in membership in the last year, skyrocketed in the polls and took nearly 4x (according to yougov) the votes from Labour as Reform did in the 2024 local elections."
"This has led to a change of prime minister - unclear whether labour are actually meaningfully changing direction but regardless the green party will keep pushing our bold and transformative politics!"
Reactions
Figures from the Commission are understood not to reflect the current state of Labour Party membership, which may have changed since. A Labour Party spokesperson said: "The Labour Party is proud to be powered by our dedicated Party members and supporters who fight day after day for Labour victories to change the country for the better."
Mainstream, a left-wing Labour campaign group, said the decline in the party's membership was "horrifying", adding: "but it needn't be terminal." A spokesman for the group's interim council added: "By building a culture and pioneering new practices to realise pluralism, internal democracy and participation, we can rebuild our movement. Labour's new leadership must make this a priority. To transform the country, we must transform Labour."
