Today, BUD LIGHT salutes you, Mr. Retail Trader Through TD Ameritrade with 2.7 mil on the ask...
You buy your shares low, and decide to sell under the 50 dma...but you don't just sell, you sell all at once...putting a single enormous block on the ask and stopping all upward momentum...
Next time, try breaking it up into smaller blocks...you'll get filled, and in the process won't stop the run (i.e. more money for you)
*Mr. Retail Trader Through TD Ameritradddddddddde*