 Rhumbline Advisers boosted its position in Krystal Biotech Inc NASDAQ:KRYS by 7.7 in the 1st quarter, according to the company in its most recent 13F filing with the SEC. The fund owned 12,175 shares of the companys stock after purchasing an additional 867 shares during the quarter. Rhumbline Advisers holdings in Krystal Biotech were worth ... 