Over 700,000 people signed up to Corbyn’s new party before the party even has a name.

Multiple sources confirm that Jeremy Corbyn and his associates launched a new left-wing political initiative in mid-2025, which attracted a large number of supporters rapidly. The figure of over 700,000 sign-ups is reported by credible outlets such as the Socialist Party website, which states that within about a week more than 700,000 people had registered their support on the 'yourparty.uk' platform. Other sources report slightly lower but still substantial numbers, such as over 250,000 signatures (New Arab) and half a million backers (The Independent), indicating rapid growth in membership interest. The party itself has not yet finalized or publicly announced an official name at the time of these reports, which aligns with the claim that the sign-ups occurred before the party had a formal name. Early announcements from Corbyn himself mentioned 200,000 sign-ups within 24 hours, showing momentum building quickly.

While exact numbers vary slightly between sources due to timing and reporting differences, the claim that over 700,000 people signed up before the party had a name is supported by multiple independent reports and appears credible. This demonstrates significant grassroots enthusiasm for Corbyn’s new political project.