ING Group announced Monday that its U.S. subsidiary, ING U.S. Inc., has filed a registration statement with the Securities and Exchange Commission to accommodate possible future transactions to further reduce the current 57 percent interest of ING Group in ING U.S. The final structure, timing, size and offer price for the possible transactions have not yet been determined and remain subject to market and other conditions, the company said. ING U.S. shares started trading on the New York Stock Exchange in May 2013, under the ticker symbol "VOYA". The filing is consistent with the Dutch-based company's previously announced plan to divest its remaining stake in ING U.S. over time. Des Moines serves as the company's main site for ING Financial Partners, a broker-dealer subsidiary, as well as its annuity and asset sales organization.