r/wallstreetbets has collectively decided to pump GameStop (GME) stock in a battle with shortsellers at hedge funds. Over the last week or so the stop price of GME is up 3x with no change in fundamentals. This user (u/DeepFuckingValue) purchased 800 call options on GME call options and is up millions of dollars on his position. Assuming the screenshots are not faked, he has yet to close his position.
Unclear if this counts as market manipulation.