The group of oil and gas pipeline and storage companies controlled by Kinder Morgan but traded separately will combine and become the 4th biggest U.S. energy company by market value.

The companies announced Sunday that Kinder Morgan Inc., Kinder Morgan Energy Partners, Kinder Morgan Management and El Paso Pipeline Partners will all combine under the Kinder Morgan Inc. umbrella and trade under the KMI ticker symbol.

The deal is subject to shareholder and regulatory approval. It is expected to close this year.

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