By Steve Holland and Alexandra Alper WASHINGTON (Reuters) -Shares of U.S. Steel rose 5% on Monday, as a $14.9-billion bid for the well-known American firm from Nippon Steel approached the finish line and after details of the U.

The two steel companies list “a golden share to be issued to the U.S. government” among the aspects of what they call a partnership agreement.

Nippon Steel’s $14 billion US Steel deal raises investor concerns over financing, control via golden share, and high acquisition premium.