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Fiera Capital sues former exec, ex-employees

Reported by Opalesque ·Investmentexecutive
Aug 11, 2026· 2 min read
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Key Takeaways
  • • Fiera Capital is suing former Canadian large-cap equities head Nessim Mansoor and five other former employees, alleging conspiracy to solicit clients and transfer them to a competing firm established by Mansoor.
  • • The lawsuit seeks $10 million in punitive damages plus compensatory damages, representing a significant legal challenge to client retention and competitive non-compete enforcement.
  • • The case involves allegations of coordinated departure by a senior investment team, raising questions about institutional client loyalty and the enforceability of restrictive covenants in the asset management industry.
Summary
Fiera Capital has initiated legal proceedings against Nessim Mansoor, formerly the head of its Canadian large-cap equities division, along with five additional former employees. According to court filings, Fiera alleges the group conspired to solicit the firm's clients and transition them to a competing investment operation launched by Mansoor.

The lawsuit represents Fiera's effort to enforce client relationships and protect its asset base against coordinated departures by senior investment professionals. By seeking $10 million in punitive damages alongside compensatory damages, Fiera is signaling its intent to establish a precedent regarding the costs of client poaching and breach of fiduciary obligations in the Canadian wealth management sector.

This litigation underscores a recurring challenge in alternative asset management: retaining institutional clients and investment talent amid competitive pressure. The case centers on whether Mansoor and his associates violated non-compete agreements, confidentiality obligations, or fiduciary duties owed to Fiera and its clients. The specifics of client losses and asset transfers remain central to the damage calculations Fiera is pursuing.

For institutional investors and family offices managing relationships with Canadian asset managers, the outcome of this dispute may influence how contractual protections are structured and enforced within the investment management industry. The case also highlights the strategic risks asset managers face when senior portfolio managers depart with significant client relationships.

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Sources

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Opalesque Fiera Capital sues former exec, ex-employees Investmentexecutive Fiera Capital sues former exec, ex-employees