Ohio Rev. Code § 1109.33: Investing in stock of federally chartered banks.

A state bank may apply to the superintendent of financial institutions for permission to invest, subject to the conditions and requirements prescribed by the superintendent, an amount, in the aggregate, not exceeding ten per cent of a stock state bank's paid-in capital and surplus or a mutual state bank's retained earnings in the stock of banks or corporations chartered or incorporated under the laws of the United States, including section 25a of the "Federal Reserve Act of 1913," 12 U.S.C. 611, as amended, and principally engaged in international or foreign banking, or in banking in a dependency or insular possession of the United States, either directly or through the agency, ownership, or control of local institutions in foreign countries, dependencies, or insular possessions.