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Short sellers believe these stocks are likely to tumble soon, although that isn't always the case.
Short sellers don't often circle major energy companies, but Kinder Morgan (KMI) isn't your typical energy stock.
Shares of the oil-and-gas pipeline operator exploded this week after the announcement of a $71 billion plan to consolidate its empire in an effort to reduce its taxes.
The move drove shares nearly 18% higher at one point on Monday.
That stock's pop lured short sellers. The number of borrowed Kinder Morgan shares shot up by 800% to 60 million after the consolidation plan was announced, according to Astec data.
Securities lending stats are one way to get a real-time feel for what stocks are being shorted.
"There is virtually a one-for-one correlation between when a stock is borrowed and when it is shorted," said Smith.