Optum Care Solutions, a unit of United Health Group, submitted an unsolicited offer to acquire Amedisys, Inc., which just last month announced plans to merge with Option Care Health, Inc.

According to a June 5 statement, the bid calls for Optum to acquire Amedisys in an all-cash transaction for $100 per share. Optum said the proposed transaction represents a 26% premium over Amedisys’ most recent closing share price. The proposal has no financing contingency or condition and does not require shareholder approval, the company said.

The move comes after Option Care Health, the nation’s largest independent provider of home infusion services, agreed in early May to buy Amedisys in an all-stock deal that valued the home health and hospice provider at roughly $3.6 billion.

Under the terms of the merger agreement, Amedisys stockholders will receive 3.0213 shares of Option Care Health common stock for each share of Amedisys common stock they hold at the closing of the transaction.

Amedisys Board of Directors determined that Optum’s unsolicited proposal “could reasonably be expected” to be a better deal than the company’s existing merger plans with Option Care Health.

As permitted by the merger agreement with Option Care Health, Amedisys entered into a confidentiality agreement with Optum and is exploring its proposal.

At the same time, Amedisys noted that it “remains bound by the terms of the merger agreement with Option Care Health,” which does not permit termination in favor of an alternative transaction.

“Amedisys’ commitment to quality and care innovation within the home, and the patient-first culture of its people, combined with Optum’s deep value-based care expertise can drive meaningful improvement in the health outcomes and experiences of more patients at lower costs, leading to continued growth,” said Patrick Conway, M.D., chief executive officer of Optum Care Solutions.