Labour Party Membership Drops 20 Percent Under Keir Starmer

The Labour Party lost more than a fifth of its membership in 2025, falling from 333,235 to 264,754, according to figures published by the Electoral Commission. This 20.6 percent decline occurred alongside a sharp financial downturn, with donations plunging 84 percent from £39.4 million in 2024 to £6.5 million in 2025, leaving the party with a £2.6 million deficit.

The exodus took place under the leadership of former Prime Minister Keir Starmer, whose government implemented rightward shifts on immigration, economic policy, and benefit payments. Contributing factors included parliamentary revolts over welfare reform, a Mandelson scandal, and the expulsion of left-leaning figures such as Jeremy Corbyn and Diane Abbott. Starmer resigned in June after losing the support of his MPs.

While Labour declined, the Green Party reported a membership surge, growing from 68,000 in September 2025 to over 200,000 by March 2026. Reform UK also claimed over 270,000 members by the end of 2025. Current Prime Minister Andy Burnham, who assumed leadership less than three weeks before the report's release, now faces pressure to reverse these trends, though party leadership maintains that improved organizational discipline is aiding financial recovery.