A national bank must apply to and obtain permission from the OCC before consummating any business combination in which the resulting entity is a national bank

This includes reorganizations under 12 USC §215a-2 in which a national bank becomes a subsidiary of a bank holding company

See the "Business Combinations" booklet of the Comptroller's Licensing Manual for details of the procedures for a national bank to consummate a business combination

12 CFR Part 5  Rules, Policies, and Procedures for
                          Corporate Activities

OCC Commentary

12 CFR Part 303  Filing Procedures

12 CFR Part 307  Notification of Changes in Insured Status

12 CFR Part 546  Merger, Dissolution, Reorganization

12 CFR Part 563  Savings Associations - Operations

See "Combination with a National or State Bank" in the OTS Applications Processing Manual

See "Mergers with FDIC-Insured Depository Institutions and non-FDIC Insured Entities In which a Savings Institution Survives" in the OTS Applications Processing Manual

See "Purchase or Sale of Assets and/or Assumption or Transfer of Liabilities By a Savings Institution from FDIC-Insured And Non-FDIC Insured Depository Institutions" in the OTS Applications Processing Manual

12 CFR 708b  Mergers of Federally-Insured Credit
                         Unions; Voluntary Termination Or 
                         Conversion of Insured Status

12 CFR Part 741  Requirements for Insurance

Merger Manual for Credit Unions

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