FMR LLC and Abigail P. Johnson filed a Schedule 13G with the SEC on November 4, 2026, disclosing beneficial ownership of Klaviyo Inc. Class A Common Stock as of September 30, 2026.

Key Highlights

  • Aggregate beneficial ownership: FMR LLC reported 6,730,468.77 shares of Klaviyo Inc. Class A Common Stock beneficially owned.
  • Percent of class: The reported holdings represent 5.3% of the outstanding Class A Common Stock.
  • Sole voting power: FMR LLC holds sole voting power over 6,625,851.69 shares, with 0.00 shares subject to shared voting power.
  • Sole dispositive power: FMR LLC holds sole dispositive power over 6,730,468.77 shares, with 0.00 shares subject to shared dispositive power.
  • Abigail P. Johnson: Also named as a reporting person, with sole dispositive power over the same 6,730,468.77 shares and 0.00 sole or shared voting power.
  • Triggering event date: The event requiring this filing occurred on September 30, 2026.
  • Ordinary course certification: The filing certifies the securities "were acquired and are held in the ordinary course of business" and not for the purpose of changing or influencing control of Klaviyo Inc.

FMR LLC and Abigail P. Johnson Disclose Ownership Position in Klaviyo Inc.

According to the Schedule 13G filed on November 4, 2026, FMR LLC, a Delaware-organized holding company, and Abigail P. Johnson, a United States individual, each reported beneficial ownership of 6,730,468.77 shares of Klaviyo Inc. (NYSE:KVYO) Class A Common Stock (CUSIP 49845K101). The filing identifies FMR LLC as a parent holding company (type "HC") and Abigail P. Johnson as an individual (type "IN"). The triggering date for the filing was September 30, 2026.

The filing states that FMR LLC holds sole voting power over 6,625,851.69 shares and sole dispositive power over 6,730,468.77 shares, with no shared voting or dispositive power reported. Abigail P. Johnson is listed as holding sole dispositive power over the same 6,730,468.77 shares, with 0.00 sole or shared voting power. The aggregate beneficial ownership for both reporting persons is recorded as 6,730,468.77 shares, equal to 5.3% of the class, according to the filing.

The filing also discloses that "one or more other persons are known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the CLASS A COMMON STOCK of KLAVIYO INC," but notes that no single other person's interest exceeds five percent of the total outstanding Class A Common Stock. Subsidiaries responsible for acquiring the reported securities are identified in Exhibit 99, attached to the filing. The document was signed by Stephanie J. Brown under powers of attorney granted by FMR LLC and Abigail P. Johnson.

What Was Disclosed

FMR LLC and Abigail P. Johnson filed a Schedule 13G reporting combined beneficial ownership of 6,730,468.77 shares, or 5.3%, of Klaviyo Inc. Class A Common Stock, with the triggering event dated September 30, 2026.