Connecticut’s financially “unstable” Obamacare health-insurance co-op was placed under state supervision on Tuesday, as regulators said 40,000 people covered by the company will ultimately have to find new plans for the coming year.

HealthyCT is the 14th of 23 original Obamacare co-ops to fail since they began selling health plans on government-run Affordable Care Act insurance exchanges. Several of the other remaining co-ops, at least, are believed to be on shaky financial ground.

Until last week, the nonprofit HealthyCT had “adequate capital and sustainable liquidity” — but that fell apart Thursday with a federal requirement that hit HealthyCT with a $13.4 million bill, according to the Connecticut Insurance Department.

. . .