Mizuho Financial Group Reports New 7.4% Stake in GigCapital7 Corp.

On May 14, 2026, Mizuho Financial Group, Inc. filed a Schedule 13G with the SEC, reporting a new 7.4% ownership stake in GigCapital7 Corp. (GIG). As of the event date on March 31, 2026, the Tokyo-based financial institution beneficially owns 1,477,330 common shares. The filing indicates that Mizuho Financial Group, Inc. holds sole voting and dispositive power over the entirety of these shares. The position is held indirectly through several subsidiaries, including Mizuho Bank, Ltd., Mizuho Americas LLC, and Mizuho Securities USA LLC, the latter being a registered broker-dealer and the direct holder of the equity securities. 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. This represents a significant new position for Mizuho in the Palo Alto-based company, as the previous reported ownership was zero.