Marty Shkreli comes to mind.

"Acknowledging a financial interest, but with no medical expertise, Mr. Shkreli has posted blogs on investing website SeekingAlpha.com, spreading unfounded and inaccurate rumors about drugs owned by companies he was shorting. He also inserted himself into the FDA approval process for pending drugs of companies he was shorting. Following such actions, the companies’ stock price dropped and Mr. Shkreli made money."

http://www.citizensforethics.org/legal-filings/entry/us-attorney-investigate-short-seller-martin-shkreli