Kosmos Energy raises IPO size to $621 million

(Reuters) - Kosmos Energy filed with U.S. regulators on Thursday to increase the size of its initial public offering by a fourth to $621 million.

The West Africa-focused oil company had previously filed for a $500 million IPO in January.

Kosmos, backed by private equity firms Blackstone Group (BX.N) and Warburg Pincus WP.UL, plans to use proceeds from the offering to help fund its capital spending.

The Hamilton, Bermuda-based company told the U.S. Securities and Exchange Commission in a preliminary prospectus that Credit Suisse (CSGN.VX), Citigroup (C.N) and Barclays Capital (BARC.L) were underwriting the IPO.

Thursday's filing did not reveal how many shares the company planned to sell or their expected price.

The company intends to list its common stock on the New York Stock Exchange under the symbol "KOS."

The amount of money a company says it plans to raise in its first IPO filings is just used to calculate registration fees. The final size of the IPO can be different.

(Reporting by Tanya Agrawal in Bangalore; Editing by Unnikrishnan Nair)