Klaviyo, INC Schedule 13G passive stakes

Andrew Bialecki, a key figure at Klaviyo, Inc., has reported beneficial ownership of 75,326,229 shares of Series A common stock, representing 36.5% of the class.

Vanguard Capital Management has disclosed a beneficial ownership of 5% of Klaviyo Inc.'s common stock as of June 30, 2026.

Capital International Investors reports an 8.0% ownership stake in Klaviyo, Inc., holding 11,703,859 shares.

Vanguard Portfolio Management has reported beneficial ownership of 7,531,915 shares, representing 5.17% of the common stock of Klaviyo Inc.

The Vanguard Group has filed an amended Schedule 13G, reporting 0% beneficial ownership in Klaviyo Inc. following an internal realignment.

Morgan Stanley has reduced its beneficial ownership in Klaviyo, Inc. Series A Common Stock to 4.1%, falling below the 5% reporting threshold.

Capital International Investors has reported a 9.3% beneficial ownership stake in Klaviyo, Inc., holding 12,788,846 shares of common stock.

Andrew Bialecki, co-founder of Klaviyo, Inc., has reported beneficial ownership of 35.1% of the company's Series A common stock as of December 31, 2025.

Morgan Stanley has disclosed an increased beneficial ownership of 10.5% in Klaviyo, Inc.'s Series A Common Stock, holding over 14.5 million shares.

Summit Partners and its affiliated funds have reported a combined beneficial ownership of 12.03% in Klaviyo, Inc.'s Series A Common Stock.

Morgan Stanley has reported a significant 8.4% beneficial ownership stake in Klaviyo, Inc.'s Series A Common Stock, totaling over 10 million shares.

Andrew Bialecki, co-founder of Klaviyo, Inc., has reported beneficial ownership of 37.7% of the company's Series A common stock as of September 30, 2025.

Ed Hallen, a U.S. citizen, has disclosed beneficial ownership of 19.4% of Klaviyo, Inc.'s Series A common stock as of September 30, 2025.

FMR LLC and its Chairman and CEO, Abigail P. Johnson, have disclosed a significant beneficial ownership of 6.7% in Klaviyo Inc.'s Class A Common Stock.

Summit Partners and its affiliated funds have increased their beneficial ownership in Klaviyo, Inc. to 20.87% of Series A Common Stock.

Andrew Bialecki, co-founder of Klaviyo, Inc., reports beneficial ownership of 42.9% of the company's Series A common stock as of June 30, 2025.

The Vanguard Group has filed an amended Schedule 13G, reporting a 10.15% beneficial ownership stake in Klaviyo Inc.'s common stock as of June 30, 2025.

Sands Capital Ventures, LLC and affiliated entities, including Frank M. Sands, have filed an amended Schedule 13G disclosing their beneficial ownership of Klaviyo, Inc. Series A Common Stock.

AllianceBernstein L.P. has filed an amended Schedule 13G, revealing a beneficial ownership of 4.4% of Klaviyo Inc.'s common stock as of March 31, 2025.

Accel Growth Fund V L.P., Accel Leaders Fund II L.P., and related entities, along with Klaviyo director Ping Li, have filed an amended Schedule 13G/A, disclosing a combined beneficial ownership of 4.9% of Klaviyo, Inc.'s Series A common stock.

Summit Partners and its affiliated funds have filed an amended Schedule 13G, revealing a collective beneficial ownership of 30.02% in Klaviyo, Inc.'s Series A Common Stock.

Accomplice Fund I, L.P., along with its general partner Accomplice Associates I, LLC, and Jeff Fagnan, have disclosed a continued beneficial ownership of approximately 10.5% of Klaviyo, Inc.'s Series A Common Stock as of March 31, 2025.

Multiple Accel investment funds and director Ping Li have filed an updated Schedule 13G, disclosing their beneficial ownership of Klaviyo, Inc. Series A common stock, primarily through convertible Series B shares.

Capital Research Global Investors has filed an amended Schedule 13G, reporting beneficial ownership of 3.8% of Klaviyo, Inc.'s common stock as of December 31, 2024.

Summit Partners has filed an amended Schedule 13G, disclosing its collective beneficial ownership of 40,827,778 shares, representing 34.13% of Klaviyo, Inc.'s Series A Common Stock.

AllianceBernstein L.P. has reported a 5.1% beneficial ownership stake in Klaviyo Inc. as of December 31, 2024, through a Schedule 13G filing with the SEC.