Was the Deepwater Horizon incident used to Manipulate stock prices?

Remember when a certain soft drink manufacturer “changed their formula” and the companies stock fell like a rock from a thirty-story building. It only took the company a few weeks to change their recipe back to the original and their stock soared to new heights. Man, I wish I had bought that stock.
Then came the Exxon Valdez oil spill on March 24, 1989. Exxon stock lost 3.9% and then climbed up 7.1% in four week. By comparison, BP has lost 13.1% so far, and was trading for about $49.60 today. Interesting enough, Halliburton stock is up 0.62
It does make one wonder if stocks in certain companies are manipulated.
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