Achillion Pharmaceuticals, Inc. is a company in the U.S. stock market and it is a holding in 5 U.S.-traded ETFs. ACHN has around 100.9K shares in the U.S. ETF market. The largest ETF holder of ACHN is the SPDR S&P Biotech ETF (XBI), with approximately 51.87K shares. Investors may also find of interest that the ETF with the largest allocation to ACHN stock is ProShares Ultra NASDAQ Biotechnology (BIB), with a portfolio weight of 0.01%. On average, U.S. ETFs allocate 0.00% of ACHN to their portfolios.