Vince McMahon pocketed over $400 million in an instant on Monday … selling a chunk of his TKO stock following his departure from the company over sexual assault allegations, according to a recent SEC filing.

McMahon dumped 5,350,000 shares — about 25% of his stock — while still holding on to his remaining stake in WWE and UFC’s parent company, which is around 15 million shares.

The SEC filing notes the value of the stocks at $411.95 million … though they could be worth closer to $436 million, as yesterday’s TKO stock price closed at $81.67 (times 5.35 million shares).

The news comes just over one month after the former honcho resigned from his role as TKO’s executive chairman as a result of a former staffer’s lawsuit filing … which accused him of heinous sexual acts and misconduct.

McMahon has maintained his innocence … but felt it was necessary to step down “out of respect for the WWE Universe.”

This is the second big stock dump for McMahon — back in November, he sold 8,400,000 shares … netting around $700 million.

McMahon — who has been out of the public eye following the allegations — has vowed to fight Janel Grant‘s allegations and clear his name … so perhaps some of his big payday will go toward legal fees.