10 days ago, several MKS Instruments, Inc. (NASDAQ:MKSI) insiders started selling their company shares, including Directors Richard Chute and Peter Hanley, who sold 3,000 and 2,000 respectively, at a price of $29.65 per share. CEO Gerard Colella also participated in the sale, giving up 3,000 of his company shares at $29.50 per share. This trend seems to have extended over time, as two more insiders stepped up today announcing their stock sale.

While company Director Robert Anderson chose to sell only 3,418 shares, directly, at a price of $29.61, leaving him with a remainder of 14,405 total shares, the Senior VP of MKS’s Business Units, Tseng-Chung John Lee took the sale even further. The insider sold off his 9,128 company shares, directly, at $29.54 per share, therefore no longer holding a stock position at MKS Instruments.

However, hedge funds like Chuck Royce’s Royce & Associates, or Ken Fisher’s Fisher Asset Management, remain solid in their shareholder positions, with approximately 8 million and 800,000 shares, respectively.

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