Vanguard Portfolio Management LLC filed Amendment No. 2 to its Schedule 13G with the SEC on October 30, 2026, disclosing beneficial ownership of 6,579,962 shares of Five9 Inc common stock as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: Vanguard Portfolio Management reported beneficial ownership of 6,579,962 shares of Five9 Inc common stock.
  • Percent of class: The reported stake represents 8.80% of the outstanding class of common stock.
  • Sole voting power: Vanguard Portfolio Management reported sole voting power over 110,696 shares.
  • Sole dispositive power: The filing reported sole dispositive power over all 6,579,962 shares, with zero shared dispositive power.
  • Triggering date: The event requiring this filing occurred on September 30, 2026.
  • Affiliates included: The filing covers securities beneficially owned by Vanguard Portfolio Management LLC and affiliates Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC.

Vanguard Portfolio Management's Disclosed Stake in Five9 Inc as of September 30, 2026

According to the filing, Vanguard Portfolio Management LLC, organized in Pennsylvania and headquartered at 100 Vanguard Blvd, Malvern, PA 19355, submitted Amendment No. 2 to its Schedule 13G regarding its holdings in Five9 Inc (NASDAQ:FIVN), whose principal executive offices are located at 3001 Bishop Dr, Ste 350, San Ramon, CA 94583. The filing is classified under Rule 13d-1(b) and identifies Vanguard Portfolio Management as an investment adviser.

The filing discloses that Vanguard Portfolio Management beneficially owned an aggregate of 6,579,962 shares of Five9 common stock (CUSIP 338307101), representing 8.80% of the class. Of that total, the registrant reported sole voting power over 110,696 shares and sole dispositive power over the full 6,579,962 shares. Shared voting power and shared dispositive power were each reported as zero.

The filing notes, in accordance with SEC Release No. 34-39538 (January 12, 1998), that the reported securities include holdings by Vanguard funds or sleeves thereof over which Vanguard Portfolio Management LLC exercises dispositive power, as well as securities held by clients over which named affiliates exercise dispositive and/or voting power. The filing further states that "Vanguard Portfolio Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein," and that no single other person's interest in the reported securities exceeds 5%. The statement was signed by My Trieu-Gatt, Authorized Signatory and Head of Global Fund Administration, on October 30, 2026.

What Was Disclosed

Vanguard Portfolio Management filed Amendment No. 2 to Schedule 13G, reporting beneficial ownership of 6,579,962 shares of Five9 Inc common stock, equal to 8.80% of the class, with sole voting power over 110,696 shares and sole dispositive power over all reported shares, as of September 30, 2026.