GameStop Corp. shares spiked and then quickly dropped in postmarket trading Monday after cryptic social media posts showed up and then disappeared from the social media account of Keith Gill, the financial influencer known as “Roaring Kitty,

GameStop Corp. Chief Executive Officer Ryan Cohen said his eBay Inc. account was suspended following a publicity stunt in which he listed a raft of personal items to fund his $56 billion bid for the online marketplace.

You do good business stuff; Your stock goes up; Now your stock is worth a lot of money; You use your valuable stock to buy things — executive talent, other companies — that help you do more good business stuff.

French-Canadian entrepreneur Stephan Tétrault has acquired GameStop Corp.’s Canadian stores, according to a Monday press release.