Endologix must conduct confirmatory clinical study By: MarketMinute.com Stock News May 18, 2017 at 16:57 PM EDT Endologix Inc. (Nasdaq: ELGX) must conduct a confirmatory clinical study for its Nellix Endovascular Aneurysm Sealing System. Shares of the medical device maker plummeted $2.47 to close at $4.26. Related Stocks: Endologix Inc