This was an earnings winner (released 2 days ago after market). Yesterday (the first market session after the release), the stock went up 30%. Premarket today, the stock went from $4 to $9.50 and the float rotated. I didn't want to chase it while it was up so high, and I didn't want to buy it premarket, so I waited for the open. The stock started crashing $2.5 down right at the open. When it found support from the support at pre-market, I entered with my trading plan outlined.