The Chicago Stock Exchange said on Friday it was evaluating its options after the US Securities and Exchange Commission blocked the sale of the bourse to a group of US and China-based investors due to the opaque nature of the buyers and their funds.

The SEC’s decision brought to an end a two-year effort to sell the exchange, known as CHX, to a consortium of investors that was led by China’s Chongqing Casin Enterprise Group and its U.S. affiliate North American Casin Holdings.

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