BlackRock, Inc. filed Amendment No. 21 to its Schedule 13G with the SEC on November 4, 2026, disclosing beneficial ownership of 13,058,352 shares of Olin Corp common stock as of October 31, 2026.

Key Highlights

  • Aggregate beneficial ownership: BlackRock reported beneficial ownership of 13,058,352 shares of Olin Corp common stock, representing 11.5% of the class.
  • Sole voting power: BlackRock disclosed sole voting power over 12,867,129 shares.
  • Sole dispositive power: BlackRock disclosed sole dispositive power over 13,058,352 shares.
  • Shared voting and dispositive power: Both shared voting power and shared dispositive power are reported as 0.
  • Five-percent subsidiary interest: According to the filing, iShares Core S&P Small-Cap ETF holds an interest of more than five percent of the total outstanding common stock of Olin Corp.
  • Filing event date: The date of event requiring this filing is stated as October 31, 2026.

BlackRock's Amended Schedule 13G Filing on Olin Corp Ownership

BlackRock, Inc., organized in Delaware and headquartered at 50 Hudson Yards, New York, NY 10001, filed Amendment No. 21 to Schedule 13G on November 4, 2026, concerning its holdings in Olin Corp (CUSIP 680665205), whose principal executive offices are located at 190 Carondelet Plaza Suite 1530, Clayton, MO 63105. The filing was signed by Spencer Fleming, Managing Director, and the event date triggering the amendment is reported as October 31, 2026.

According to the filing, BlackRock beneficially owns 13,058,352 shares of Olin Corp common stock, equal to 11.5% of the class. Of that total, the company reports sole voting power over 12,867,129 shares and sole dispositive power over the full 13,058,352 shares. No shares are subject to shared voting or shared dispositive power, the filing states. The filing notes that this Schedule 13G "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 beneficially owned by other business units whose beneficial ownership is disaggregated from the Reporting Business Units in accordance with SEC Release No. 34-39538.

The filing further discloses that iShares Core S&P Small-Cap ETF holds an interest in Olin Corp common stock that is more than five percent of the total outstanding shares. BlackRock certifies in the filing that 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." Subsidiary identification details are provided in Exhibit 99 attached to the filing.

What Was Disclosed

BlackRock, Inc. filed Amendment No. 21 to Schedule 13G disclosing 13,058,352 shares, or 11.5%, of Olin Corp common stock beneficially owned as of October 31, 2026, with iShares Core S&P Small-Cap ETF identified as holding more than five percent of Olin Corp's outstanding stock.