Rafferty Asset Management LLC Raises Stake in MKS Instruments, Inc. (NASDAQ:MKSI)
Rafferty Asset Management LLC grew its stake in shares of MKS Instruments, Inc. (NASDAQ:MKSI – Free Report) by 15.1% during the 4th quarter, according to its most recent 13F filing with the SEC. The institutional investor owned 399,500 shares of the scientific and technical instruments company’s stock after purchasing an additional 52,493 shares during the […]