Occidental will issue $9.1 billion in debt and about $1.7 billion in common stock to finance the transaction. Occidental Petroleum on Monday agreed to buy CrownRock , a major privately held energy producer that operates in the Permian Basin, for $12 billion. Occidental CEO Vicki Hollub said the company is purchasing CrownRock to increase its scale in the Midland Basin. Occidental is the ninth-largest energy company in the U.S. with a market capitalization of $49.7 billion. Occidental's purchase of CrownRock is the third major deal in the energy sector in less than two months.

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Persons: Vicki Hollub, Hollub, CNBC's, CrownRock, Timothy Dunn, Warren Buffett's, Warren Buffett's Berkshire Hathaway, Berkshire Hathaway, Buffett, Carl Icahn, Enverus, Weeks, Hess Organizations: Midland Basin, U.S . Energy Information Administration, U.S, Occidental Petroleum, Occidental, Endeavor Resources, Houston, Lime Rock Partners, Warren Buffett's Berkshire, Anadarko Petroleum, Exxon Mobil, Natural Resources, Chevron, Pioneer, Texas Intermediate, CNBC, Energy Information Administration Locations: Occidental, Midland, Texas, U.S, Warren, Berkshire, CrownRock