Last week, the stock of Uber Technologies went on a wild ride, falling hard after Uber reported earnings on Feb. 5, only to rocket higher toward the end of the week. On earnings, while revenue and earnings per share actually beat expectations,

Uber stock hit its highest level since October after Ackman disclosed his Pershing Square hedge fund accumulated a 1.4% stake in the ride hailer.

Uber’s stock extends its surge as hedge funder Ackman says he’s amassed a 30.3-million-share stake since early January.