I have several. Actually come to think of, eight total life shattering trades in a period of a decade. I should start my own thread.....
One that jumps out at me happened back around Halloween 2005. Based on thorough technical scan indicators and the anticipation of upcoming news on their infinite lawsuit saga in early 2006, I started loading RMBS in 1000 share blocks.
After a couple weeks I put together a large position at a cost average somewhere around $13.11ish. I was using margin as well, so I even splurdged for some near term $12.50 puts.
Well after a couple more weeks and serious restlessness as the stock did jack squat, I dumped the puts and the stock postion for a small loss.
Not even 3 whole trading days later, RMBS gaps to mid teens and two months later is trading around $45 per share. I never recovered.
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I think the worst one was back in 2007 when Eloan's merger was suspect and the IV on the put options was insane. The stock was trading at $9.50 per share, but the 1 3/4 month out $2.50 puts were bidding .80. I sold 750 of these contracts worth 75,000 shares of underlying stock at a break even of $1.70 because myself and an attorney did our due diligence. There was no legal way that this merger could not happen.
So guess what happens? I shorted these puts on a Friday and that weekend, BREAKING NEWS >>> ELOAN MERGER OFF! SAID TO BE IN BREACH OF CONTRACT!!!!!>>>>>
So now I am shitting my pants. I can not sleep the entire weekend. I was in shock. So Monday I covered the puts as the stock crashed to just below the $5 mark for a decent size loss.
But here comes even more good news. Two days later, Eloan is given a lower cash amount offer from its acquirer. It was a ploy all along. The acquiring company was just trying to pay less for Eloan. Instead of $15, they paid like $11.50 for them. The merger ends up going through without a hitch. I would have pocketed 100% of that premium, just like my due diligence said I would.
Timing is everything.