On May 17 GameStop announced plans to sell up to 45 million shares, and on May 24th they announced that all 45 million shares were sold for $933 million, at an average price of about $20.73.

Modifying shares outstanding from 306 million to 351 million is an approximately 15% dilution. A shareholder could have expected the value of their own share holdings to have dropped 15% from this action, but shareholder value hardly went down at all as a consequence of the dilution and in fact is up about 75% from May 1 to May 24.