In regards to this stock split:

The stock split will be effected by means of a stock dividend to the holders of record of MicroStrategy’s class A common stock and class B common stock as of the close of business on August 1, 2024, the record date for the dividend.
In each case, the shares are expected to be distributed after the close of trading on August 7, 2024. Trading is expected to commence on a split-adjusted basis at market open on August 8, 2024. The stock dividend will not have any impact on the voting and other rights of stockholders.

Historical info on prior stock splits:

It is interesting that in a prior stock run up MSTR Split and then had to do reverse split:
Jan. 27, 2000 2-for-1 July 31, 2002 1-for-10
Motley Fool link mention Old Super Bowl Ad: