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Jeb Bush is selling his last two business stakes

Former Florida governor Jeb Bush shakes hands with attendees after speaking at the 42nd annual Conservative Political Action Conference (CPAC) February 27, 2015 in National Harbor, Maryland.

Alex Wong, Getty Images

Former Florida Gov. Jeb Bush is selling his stakes in the last two business endeavors where he plays an ownership role - a sure sign that a presidential candidacy is just on the horizon.

"Just as he said he would, Governor Bush has been reviewing his private sector commitments as he contemplates a potential run," Bush spokeswoman Kristy Campbell said in a statement. "This was a natural step as Governor Bush transitioned his time and focus from running his business to increasing his political efforts on behalf of conservative candidates and causes."

The GOP frontrunner is leaving Jeb Bush & Associates, a consulting group he started after his tenure as Florida governor, and is also resigning from two positions at business advisory corporation Britton Hill, where he was one of two partners at Britton Hill Partners and one of four at Briton Hill Holdings.

"I have enjoyed the experience of starting and building a business with my talented partners. George will be a valuable addition to the Britton Hill team, and I wish them all the best," the potential Republican nominee said, in a statement released by Britton Hill.

Bush's resignation from these companies, first reported by the Washington Post, is the latest sign of his likely presidential run in 2016. The former Florida governor withdrew from all of his board memberships in January, including positions at companies like Tenet Healthcare Corp, British banking giant Barclays, and the for-profit Academic Partnerships.

He finalized the deals with the Britton Hill entities and Jeb Bush & Associates in March.