Fiera Capital Corp. FSZ-T is locked in a legal battle with its recently terminated infrastructure head, with both sides suing each other after years of poor fund performance and investor redemption requests.

Alina Osorio, Fiera Infrastructure’s former president, is suing the company for wrongful dismissal, partly attributing her departure to differences over how to handle a large queue of investor redemption requests that now totals $700-million. Ms. Osorio, who sold her infrastructure business to Fiera a decade ago, also argues in her suit that she has the right to buy it back.

Two weeks after she filed her lawsuit in September, Fiera filed its own, alleging Ms. Osorio secretly tried to engineer a sale of Fiera’s majority stake in its infrastructure business and that she persisten

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