(Bloomberg) -- Illegal or not, trading in options may be the most prescient news you can use.
The number of options to buy shares of Valero Energy Corp. and American Express Co. doubled in the week before the companies reported better-than-estimated earnings. Trading in contracts tied to TXU Corp. and Dow Jones & Co. climbed at least sevenfold a day ahead of takeover announcements that pushed the stocks up as much as 55 percent and prompted a manhunt for the leakers.
Read more at Bloomberg Exclusive News
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