Sumitomo Mitsui Trust Group, Inc. filed Amendment No. 5 to its Schedule 13G with the SEC on October 29, 2026, disclosing beneficial ownership of 121,591,698 shares of Mizuho Financial Group, Inc. common stock as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: Sumitomo Mitsui Trust Group, Inc. reported beneficial ownership of 121,591,698 shares of Mizuho Financial Group common stock, representing 5.0% of the class.
  • Shared voting power: The filing reported shared power to vote or direct the vote for 114,648,798 shares, with sole voting power of 0 shares.
  • Shared dispositive power: The filing reported shared power to dispose or direct the disposition of 121,591,698 shares, with sole dispositive power of 0 shares.
  • Triggering event date: The date of the event requiring the filing was stated as September 30, 2026.
  • Subsidiary name change: The filing disclosed that Nikko Asset Management Co., Ltd. changed its name to Amova Asset Management Co., Ltd. as of September 1, 2025.
  • Reporting entity classification: Sumitomo Mitsui Trust Group, Inc. is classified as a parent holding company (HC) and financial institution (FI), organized in Japan.

Sumitomo Mitsui Trust Group Discloses Position in Mizuho Financial as of September 30, 2026

According to the filing, Sumitomo Mitsui Trust Group, Inc., a Japan-incorporated parent holding company, submitted Amendment No. 5 to Schedule 13G with respect to its holdings in Mizuho Financial Group, Inc. (CUSIP 60687Y109). The filing was signed by Hideaki Takamiya, Senior Manager of Risk Management Dept, and dated October 29, 2026. The issuer's principal executive offices are located at 5-5, Otemachi 1-chome, Chiyoda-ku, Tokyo, Japan, 100-8176, according to the filing.

The filing reported that portions of the securities are owned, or may be deemed to be beneficially owned, by two subsidiaries: Sumitomo Mitsui Trust Asset Management Co., Ltd. and Amova Asset Management Co., Ltd. Both subsidiaries are classified as investment advisers under Section 240.13d-1(b)(1)(ii)(E) and as non-U.S. institutions under Section 240.13d-1(b)(1)(ii)(J), according to the filing. The filing also noted that Amova Asset Management Co., Ltd. was formerly known as Nikko Asset Management Co., Ltd., which changed its name effective September 1, 2025.

The filing certified, in accordance with the standard Schedule 13G certification language, that "the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer." Item 5 of the filing indicates ownership of 5 percent or less of the class, consistent with the reported 5.0% figure. Item 6 states that ownership of more than 5 percent on behalf of another person is "Not Applicable."

What Was Disclosed

Sumitomo Mitsui Trust Group, Inc. disclosed beneficial ownership of 121,591,698 shares of Mizuho Financial Group common stock, equal to 5.0% of the class, as of September 30, 2026, via Amendment No. 5 to Schedule 13G filed October 29, 2026.