RSP Permian Inc. opened an initial public offering (IPO) of 20 million common shares, at an anticipated price of $19-$21 per share on Jan. 7. More than nine million shares are offered, the company also said the same day.

And the selling stockholders—who are offering more than ten million shares—are also letting underwriters purchase an additional three million shares if they sell more than 20 million shares to cover overallotments, the company said.

The underwriters’ additional purchase option is for 30 days, the company added.

RSP will trade on the New York Stock Exchange under the symbol “RSPP,” the company said.

The IPO was made on prospectus, the company said. Joint book-runners for it were Barclays PLC (NYSE: BCS), J.P. Morgan (NYSE: JPM), Tudor, Pickering, Holt & Co., Raymond James (NYSE: RJF), RBC Capital Markets and UBS Investment Bank (NYSE: UBS), the company said.

RSP Permian, Inc. is an independent oil and natural gas acquisition, exploration, development and production company. It’s focused on the Permian Basin, and based in Dallas.