Gulf Keystone Petroleum Ltd. isn't in talks regarding a potential sale of the company, the Kurdistan-focused explorer said Monday, describing as "unfounded" a U.K. newspaper report it was the subject of a potential offer from Exxon Mobil Corp. that valued the AIM-listed company at more than $10 billion. "Whilst there is clearly increasing interest in the region in which Gulf Keystone operates, the board is not in discussions with regard to a sale of the company," said the company in a statement
Gulf Keystone Petroleum Ltd. isn't in talks regarding a potential sale of the company, the Kurdistan-focused explorer said Monday, describing as "unfounded" a U.K. newspaper report it was the subject of a potential offer from Exxon Mobil Corp. that valued the AIM-listed company at more than $10 billion.

"Whilst there is clearly increasing interest in the region in which Gulf Keystone operates, the board is not in discussions with regard to a sale of the company," said the company in a statement.

Gulf Keystone shares soared 22% in early trade after a report in U.K. paper the Independent on Sunday said Exxon was considering an 800 pence a share offer for the firm, nearly five times last week's closing share price. However, the stock shed some of these gains by midday after a Gulf Keystone executive poured cold water on the rumors, telling Dow Jones Newswires the Independent story "had no base."

Gulf Keystone shares ended the day up 13 pence, or 7.7%, at 178p. At 1726 GMT, Exxon shares were down 38 cents, or 0.4%, at $79.76.

Exxon said: "It isn't our practice to comment on media reports, rumors or speculation."

The U.S. oil major last month signed an exploration deal with the Kurdistan Regional Government, which led to some observers suggesting a resolution to a long-standing dispute between Baghdad and Erbil could be in the offing.

Interest in the semiautonomous region's oil fields has until recently been limited to more prospective explorers like Gulf Keystone, and Turkey's Genel Enerji, which was recently bought by ex-BP PLC Chief Executive Tony Hayward's investment vehicle Vallares. But some large discoveries and more favorable contracting terms in the region have drawn the attention of the majors, who have concentrated their efforts in the country on the giant oil fields in the south.

Analysts and traders said they wouldn't be surprised if a bid was to emerge for the Bermuda-based explorer, which says its Shaikan discovery holds between 8 billion and 13.4 billion barrels of oil.

Investec analyst Angus McPhail said although news of a potential deal was positive, he had his reservations about whether one would be forthcoming, at least from Exxon.

"Given Exxon have already acquired acreage in Kurdistan it is somewhat doubtful that they would want to acquire even more acreage before assessing what they have just acquired," said McPhail.

Traders said talk of a bid highlighted the attractiveness of Gulf Keystone as an acquisition target.

"A bid has always been on the cards," said a trader, who asked not to be named. "With their already proven resources, Gulf Keystone are a nice target for the big boys."