>> a lockup period ending matching with mandated index fund buying is emphatically good for IPO buyers

I cant believe you wrote this. You are making Ed Zitron case for him. And the lockup period in this case has been reduced to 15 days or less:

https://youtu.be/T8e2FbwN7dw?t=96

https://youtu.be/T8e2FbwN7dw?t=123