By Christopher Bjork 

MADRID--The board of Spain's Deoleo SA agreed to sell the company to private-equity firm CVC Capital Partners, ending a monthslong and often politically charged search for a buyer of the world's largest olive-oil bottler.

Several Spanish banks with stakes in the maker of household brands such as Bertolli and Carbonell will sell 29.99% of the company to the U.K.-based firm, Deoleo announced late Thursday. CVC had offered to buy Deoleo for EUR0.38 (53 cents) a share, valuing the company at EUR438.8 million.

As part of the transaction, Deoleo may issue new shares that would be purchased by CVC to bolster Deoleo's finances. CVC has agreed to launch a takeover bid for the rest of the company once the first part of the transaction is concluded, Deoleo said.

Deoleo accounts for 22% of global sales of bottled olive oil, making it a prized asset in the food industry. It posted a EUR20 million euro profit last year and revenue of EUR813 million.

But a series of ill-timed acquisitions has left the company EUR472 million in debt at a time when Spanish banks are trimming their industrial holdings in an effort strengthen their capital ratios and focus attention on retail banking.

The group of former savings banks that control Deoleo hired J.P. Morgan Chase last summer to find a buyer for their stakes.

That decision drew interest from several private-equity funds as well as Italy's state-owned Fondo Strategico Italiano and Qatar Holding LLC, an arm of the Gulf emirate's main sovereign-wealth fund.

The latter two teamed up to bid for Deoleo, causing an uproar from Spanish olive-oil farmers and government officials, who frowned on the idea of Italian control over the biggest player in a Spanish-dominated industry but appeared to feel more comfortable with CVC's bid.

The government in recent days said it might buy a small stake in Deoleo to ensure a degree of Spanish control over the firm, but it hasn't done so. In Italy, Prime Minister Matteo Renzi told reporters that Spanish authorities seemed to have an ideological aversion to Italian control of the company.

Not all Deoleo's large shareholders supported the decision to sell to CVC. A cooperative of Spanish olive-oil farmers that owns 10% of the company said it "lamented" the Spanish banks' decision to sell to a foreign fund "when there were clear alternatives in the process giving the company a viable future with Spanish ownership."

Write to Christopher Bjork at christopher.bjork@wsj.com

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