Michael Saylor says 25% of Mag8 companies now hold Bitcoin on balance sheets after SpaceX IPO revealed 18,712 BTC alongside Tesla's 11,509 BTC holdings.

Elon Musk’s mega-company holds more Bitcoin than cryptocurrency broker Coinbase.

Elon Musk's SpaceX is set to begin trading on the Nasdaq under the ticker SPCX on Friday, officially joining the ranks of public Bitcoin treasury companies with 18,712 BTC worth…