SpaceX opened at $150 officially (the offer price had been $135) on NASDAQ, and it was bought up to $175. SpaceX's total valuation now put at $2t. SpaceX has a current estimated value of max $190 min $165, according to Wall Street.
I think the private market was buying shares for like $75 during the week. There's not the standard IPO 6-month lockup on selling stock (partially because it's a 24 year old company), but there are some limitations, reportedly.