April 10 (Reuters) - Pioneer Natural Resources Co's (PXD.N) shares rose as much as 8.5% on Monday following a report that Exxon Mobil Corp (XOM.N) held preliminary talks with the U.S. shale oil producer about a possible acquisition.
Shares of Pioneer were up 6.5% at $221.74, while Exxon Mobil inched up 0.2% to $115.25.
Pioneer is the third-largest oil producer after Chevron Corp (CVX.N) and ConocoPhillips (COP.N) in the Permian basin, the biggest in the United States.
Analysts believe Pioneer and other exploration and production companies could be acquired in the coming quarters given oil giants such as Exxon are looking to boost inventory.
"Would not be surprised to see Exxon step up for PXD's scale and inventory depth in the Midland Basin, but the price tag will ultimately be based on the oil prices underwritten by Exxon.
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