Recently, various executives have taken part in insider selling activity for the stocks of GoPro Inc (NASDAQ:GPRO), Twitter Inc (NYSE:TWTR), Tetraphase Pharmaceuticals Inc (NASDAQ:TTPH), and Clean Energy Fuels Corp (NASDAQ:CLNE).

GoPro Inc

President Anthony John Bates unloaded 7,434 GoPro shares, valued at $275,272, in two transactions dated September 8. The shares were sold via automatic sale program. Bates now holds 19,963 of the company’s shares that are valued at $668,761. According to TipRanks.com, which measures corporate insiders’ success based on their transactions, Anthony John Bates has an average return of 23.7% and a 87.5% success rate. Bates is ranked #2125 out of 34001 corporate insiders.

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Twitter Inc

SVP of Engineering Alexander Roetter sold 6,646 Twitter shares valued at $182,108, on September 8. The shares were sold via automatic sale program. Roetter now holds 896,351 of the company’s shares that are valued at $24,766,178. According to TipRanks, Alexander Roetter has an average return of 27.1% and a 83.3% success rate. Roetter is ranked #2785 out of 34001 corporate insiders.

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Tetraphase Pharmaceuticals Inc

COO John Craig Thompson disposed of 10,000 Tetraphase Pharmaceuticals shares (96% of total stake), valued at $440,800, in a transaction dated September 9. The shares were sold via automatic sale program. Thompson now holds 343 of the company’s shares that are valued at $2,909.

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Clean Energy Fuels Corp

Director Boone Pickens dumped 697,860 Clean Energy Fuels shares (3% of total stake), valued at $3,435,311, in three transactions dated September 8 to 10. Pickens now holds 17,441,860 of the company’s shares that are valued at $81,104,649. According to Tipranks, Pickens has an average return of 37.2% and a 80% success rate. Pickens is ranked #2603 out of 34001 corporate insiders.

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