(Bloomberg) -- Southwest Gas Holdings Inc. confirmed that billionaire Carl Icahn made an unsolicited tender offer for its outstanding shares and said its board of directors will review the offer.

Southwest will announce its view on the offer within 10 business days and the company advised shareholders to take no action at this time, the company said in a statement Wednesday. 

Icahn tweeted his offer to buy Southwest shares at $75 per share earlier Wednesday morning. He has argued that Southwest’s takeover of pipeline company Questar is “ill-advised.”

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