Activist investor HoldCo Asset Management is engaged in a dispute with Comerica Bank and Fifth Third Bancorp over their proposed acquisition. HoldCo argues the deal undervalues Comerica and has urged shareholders to vote against it, even resorting to legal action. Comerica maintains its commitment to the transaction, while Fifth Third's CEO expressed confidence in the deal's completion, expected in early 2026. This situation highlights increasing pressure from activist investors on US banks.