Klaviyo IPO Presentation Deck

Offering summary Issuer Offering Size Over-allotment Pricing Range Exchange/Ticker Expected Pricing Date Use of Proceeds Lead Bookrunners Joint Bookrunners Bookrunners Co-Managers Klaviyo, Inc. 19,200,000 Shares of Series A Common Stock (60% Primary / 40% Secondary) 15% (100% Secondary) $25.00 $27.00 per share NYSE/KVYO Tuesday, September 19, 2023 Working capital and other general corporate purposes and to fund growth strategies. Klaviyo may also use a portion of the net proceeds to acquire or invest in complementary businesses, products, services, technologies, or other assets. However, Klaviyo is not party to any acquisition or investment agreements at this time. A portion of the net proceeds will be used to satisfy anticipated tax withholding and remittance obligations related to the settlement of outstanding RSUS in connection with this offering. Klaviyo will not receive any proceeds from the sale of shares of its Series A common stock being offered by the selling stockholders. Goldman Sachs, Morgan Stanley, Citigroup Barclays, Mizuho, William Blair Piper Sandler, Truist Securities Baird, Canaccord Genuity, Needham & Company, TD Cowen 2023 Ⓒ Klaviyo Confidential 3

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