TRIL > Matrix Capital reports 16.5% ownership. Matrix has $3.1B AUM and only 5 other healthcare stocks with big bets on SGEN, INCY, ADAP, EXEL and DVA. https://whalewisdom.com/schedule13d/view/matrix-capital-management-company-lp-sc-13g-2017-12-08-tril Matrix Capital Management Company is based out of Waltham. Matrix Capital Management Company is a hedge fund with 1-10 clients and discretionary assets under management (AUM) of $2,972,588,000 (Form ADV from 2017-03-31). Their last reported 13F filing for Q3 2017 included $3,127,380,000 in managed 13F securities and a top 10 holdings concentration of 82.09%. Matrix Capital Management Company's largest holding is Netflix Inc with shares held of 3,810,000.