WSJ News Exclusive | Exxon Mobil Eyes Potential Megadeal With Shale Driller Pioneer
The oil and gas giant has held informal, early-stage talks to buy Pioneer Natural Resources, which is valued at $49 billion.
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### Instruction: WSJ News Exclusive | Exxon Mobil Eyes Potential Megadeal With Shale Driller Pioneer

### Response: The oil and gas giant has held informal, early-stage talks to buy Pioneer Natural Resources, which is valued at $49 billion.