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Of course that's not yet a membership, more people who are interested in joining a new party.
And no word yet whether there will be a membership fee although some 300K joined Labour under Corbyn and paid 5 quid a month filling their coffers.
Some surveys are already saying Your Party could take over 30% of the vote while local councilors are already leaving to join along with the Manchester Labour Youth who have switched to Your Party. There will be more including some Labour MPs eventually.
All this before the party is even off the ground and no policies have been announced although people pretty well know what Corbyn stands for.
No wonder Labour are spitting chips. It's from them the real attacks will come.
7 days is a long time in politics as Harold Wilson famously said but 4 years? Hard to tell what will happen.