Health insurance giants Anthem and Aetna are standing behind their ObamaCare plans one day after a top competitor warned it might pull out of the exchanges.

In a statement on Friday, both companies backed their 2015 forecasts and said they remained committed to the exchanges.

It’s a move from both companies to reassure investors feeling uneasy after the stunning announcement from UnitedHealthcare on Thursday about financial concerns it says are being caused by ObamaCare.

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UnitedHealth lowered its forecast profits by several hundred million dollars and cast doubt its future participation in the marketplace.

The news sent shockwaves through an already anxious healthcare marketplace, less than a month into this year’s open enrollment period for ObamaCare plans.

On Thursday, Aetna shares fell 7 percent while Anthem faced a 9 percent drop, though both saw slight rebounds Friday.

Aetna officials remain committed to the exchanges and will be "continuing our dialogue with policymakers and regulators regarding how we can improve the stability of the individual market," Chief Executive Officer Joseph Swedish said in a statement.

Two smaller insurers — Molina and Centene, which have about 200,000 and 150,000 ObamaCare customers, respectively — also said they were staying put in the exchanges.

“We are doing fine,” Molina wrote on its UBS page on Thursday, adding that it is “too early to question the long term viability of the public exchange markets.”