thyssenkrupp AG (XTRA:TKA) is considering listing its steel division on the stock market amid mounting opposition to a potential sale to Liberty Steel Group, according to people familiar with the matter. Thyssenkrupp executives are studying the idea of handing existing shareholders stock in the steel unit, the people said, asking not to be identified because the information is private. Some supervisory board members have called on Thyssenkrupp to explore an alternative to the Liberty sale after union officials and some large shareholders raised concerns, the people said. No final decisions have been made on whether to opt for a sale or spinoff of the unit, the people said. Developing the business by itself remains an option for Thyssenkrupp, a spokesperson for the steelmaker said, declining to further comment. A spokesman for Liberty declined to comment.