BlackRock Portfolio Management LLC filed a Schedule 13G with the SEC on October 27, 2026, disclosing beneficial ownership of 2,938,198 shares of common stock in Octave Specialty Group Inc, representing 6.5% of the class, as of a triggering event dated September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: BlackRock Portfolio Management LLC reported beneficial ownership of 2,938,198 shares of Octave Specialty Group Inc common stock.
  • Percent of class: The reported position represents 6.5% of the outstanding common shares, according to the filing.
  • Sole voting power: The filing states sole voting power over 2,383,858 shares, with shared voting power of zero.
  • Sole dispositive power: Sole dispositive power is reported over the full 2,938,198 shares, with shared dispositive power of zero.
  • Triggering event date: The date of the event requiring this filing is listed as September 30, 2026.
  • No single beneficiary above 5%: The filing states that no one person's interest in Octave Specialty Group Inc common stock exceeds five percent of the total outstanding common shares.
  • Signed by: Spencer Fleming, Managing Director of BlackRock Portfolio Management LLC, signed the filing on October 27, 2026.

BlackRock Portfolio Management's Schedule 13G Filing for Octave Specialty Group

BlackRock Portfolio Management LLC, organized in Delaware and headquartered at 50 Hudson Yards, New York, NY 10001, filed a Schedule 13G disclosing a position in Octave Specialty Group Inc (CUSIP: 023139884), whose principal executive offices are located at 40 Wall Street, New York, NY 10005. The filing was submitted on October 27, 2026, with a triggering event date of September 30, 2026. The reporting person is classified as a parent holding company or control person, designated type "HC" on the cover page.

According to the filing, BlackRock Portfolio Management LLC beneficially owns 2,938,198 shares of Octave Specialty Group Inc common stock, equal to 6.5% of the class. Of that total, the filer holds sole voting power over 2,383,858 shares and sole dispositive power over all 2,938,198 shares. Shared voting and shared dispositive power are each reported as zero. The filing notes that it "reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the 'Reporting Business Units') of BlackRock, Inc. and its subsidiaries and affiliates" and does not include securities held by other business units that are disaggregated in accordance with SEC Release No. 34-39538.

Regarding dividends and sale proceeds, the filing discloses that "various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of OCTAVE SPECIALTY GROUP INC," while also affirming that no single person's interest exceeds five percent of the total outstanding common shares. The certification states the securities "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."

What Was Disclosed

BlackRock Portfolio Management LLC disclosed via Schedule 13G that it beneficially owns 2,938,198 shares, or 6.5%, of Octave Specialty Group Inc common stock as of September 30, 2026, with full sole dispositive power and no shared voting or dispositive power reported.