How stock-market investors can play health care’s latest merger mania By: MarketWatch March 09, 2018 at 12:03 PM EST Start with Aetna, Allergan, the SPDR S&P Biotech ETF and the SPDR S&P Health Care Equipment ETF Read More >> Related Stocks: Aetna Allergan Plc Anthem Inc Bluebird Bio CVS Health Corp Celgene Corp Cigna Corp Community Health Systems Express Scripts Holding Healthcare ETF Vanguard Johnson & Johnson Pfizer Quorum Health Corp S&P Biotech SPDR S&P Healthcare Equipment SPDR Tenet Healthcare