There are several documented market anomalies (and much more undocumented ones!).

One that is widely recognized is the post–earnings-announcement drift, or PEAD.

“PEAD is the tendency for a stock’s cumulative abnormal returns to drift in the direction of an earnings surprise for several weeks (even several months) following an earnings announcement.”

A chart always says it better.

Here’s Nvidia (NVDA) with 3 PEADs in a row:

NVDA Gap & Go

Comes handy in case you run into some EMH enthusiast.