KEY POINTS
  • Hospital and health insurer stocks plunged after a federal judge ruled the ACA unconstitutional.
  • U.S. District Court Judge Reed O'Connor of Texas issued the decision late Friday.
  • The lawsuit was backed by the Trump administration and is likely to be appealed.
President Barack Obama

Hospital and health insurer stocks plunged Monday after a federal judge in Texas ruled former President Barack Obama's signature health law, the Affordable Care Act, unconstitutional.

Shares of HCA Healthcare, the largest for-profit U.S. hospital operator, fell 2.9 percent Monday. Shares of insurer Cigna closed down 3.3 percent. Health-care service company Centene slid 4.7 percent, managed health company Molina Healthcare plunged 8.9 percent and Tenet Healthcare fell 6.8 percent.