Bank of Montreal says it expects to grow its U.S. mergers and acquisitions business through the purchase of a Minneapolis-based advisory firm, which will become part of BMO Capital Markets.

The bank says it has a definitive agreement to acquire Green Holcomb Fisher, a boutique M&A advisory firm.

BMO says the financial terms aren't being made public. The deal requires regulatory approvals and is expected to close by the bank's fiscal fourth quarter ending Oct. 31.

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Bank of Montreal says Green Holcomb Fisher will complement its existing U.S. mergers and acquisitions practice and double the number of M&A transactions it handles in the United States.

Besides its head office in Minneapolis, Green Holcomb Fisher has offices in Seattle and Atlanta.