HOUSTON—With a trio of big oil and gas finds, Exxon Mobil Corp. is making its first major splash in the U.S. Gulf of Mexico in decades.

For years, the world’s largest publicly traded oil company was a minor presence in the Gulf, compared with fellow giants such as BP PLC and Chevron Corp. But the company on Wednesday unveiled three discoveries that are likely to turn it into one of the biggest producers of oil and gas in the region.

“This is one of the largest discoveries in the Gulf of Mexico in the last decade,” said Steve Greenlee, president of Exxon Mobil’s exploration business.

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