Cigna CEO: Obamacare marketplace remains 'challenging' for 2017, 2018 By: CNBC.com News August 04, 2017 at 12:17 PM EDT Cigna entered the Obamacare exchanges in 2014, to try to find a "solution" that worked, CEO David Cordani told CNBC on Friday. Read More >> Related Stocks: Aetna Cigna Corp