Polar Asset Management Partners Inc. Acquires 13.3% Stake in M3-Brigade Acquisition V Corp.

On April 7, 2026, Polar Asset Management Partners Inc. filed a Schedule 13G/A with the SEC, reporting a significant stake in M3-Brigade Acquisition V Corp. (MBAV). As of the event date on March 31, 2026, the Canadian-based investment advisor disclosed beneficial ownership of 3,812,849 Class A ordinary shares, representing 13.3% of the class. This filing marks an increase from a previously reported 0.0% position, indicating a new substantial holding by the firm. Polar Asset Management Partners serves as the investment advisor to the Polar Multi-Strategy Master Fund (PMSMF), which directly holds the shares. The reporting person maintains sole voting and dispositive power over the entire reported amount. The filing was made under Rule 13d-1(b), certifying that the shares were acquired in the ordinary course of business and not for the purpose of influencing or changing the control of the issuer. The shares have an estimated market value of approximately $41 million based on the filing data.