Summit Partners entities sell 6.5M shares of Klaviyo at $30.01 each in secondary offering

Klaviyo, Inc.

Selling stockholders (Summit Partners affiliates) offer 6.5M shares at $30.01; underwriter has 30-day option for 975K additional shares.
Klaviyo receives no proceeds from the secondary offering.
Offering expected to close on or about August 21, 2025; Barclays acts as sole underwriter.
Secondary sale represents a liquidation event for Summit Partners, not a capital raise for the company.
Shares registered on Form S-3 filed February 19, 2025; pricing announced August 15, 2025.

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