Klaviyo plans Series A stock sale under Form 144

Klaviyo, Inc. received a notice of intent to sell 1,845,131 shares of its Series A common stock, par value $0.001 per share, through Goldman Sachs & Co. LLC on the NYSE.

Rhea-AI Filing Summary

Klaviyo, Inc. received a notice of intent to sell 1,845,131 shares of its Series A common stock, par value $0.001 per share, through Goldman Sachs & Co. LLC on the NYSE. The proposed sale has an aggregate market value of $33,876,605.16, with 126,937,933 shares of this class outstanding.

The disclosure also lists prior activity labeled as Pre-IPO Transactions, involving 20,086,500 shares of Series A common stock dated September 20, 2023, with a note that equity interests in Klaviyo were purchased pre-IPO.

Key Figures

Shares to be sold: 1,845,131 shares Aggregate market value: $33,876,605.16 Shares outstanding: 126,937,933 shares +3 more

6 metrics

Shares to be sold 1,845,131 shares Series A common stock proposed for sale under Form 144

Aggregate market value $33,876,605.16 Value of 1,845,131 Series A shares covered by the notice

Shares outstanding 126,937,933 shares Outstanding Series A common stock at time of notice

Pre-IPO transaction shares 20,086,500 shares Series A common stock in Pre-IPO Transactions on 09/20/2023

Proposed sale date 08/11/2026 Date associated with proposed NYSE sale of Series A shares

Pre-IPO transaction date 09/20/2023 Date of Pre-IPO Transactions involving Series A common stock

Key Terms

Form 144, Series A common stock, Pre-IPO Transactions, aggregate market value, +1 more

5 terms

Form 144 regulatory

"A notice of proposed sale of securities is filed on Form 144"

Form 144 is a document that investors must file with the government when they plan to sell a large number of shares of a company's stock. It helps ensure transparency so everyone knows how many shares are being sold and when, which can impact the stock's price.

Series A common stock financial

"Series A common stock, par value $0.001 per share"

Series A common stock is a specific class of a company’s ordinary shares issued during an early formal funding round, carrying the ownership rights and voting power tied to that class. For investors it signals an early-stage equity claim with potential upside if the business grows, but also greater risk and typically less liquidity than shares in mature, publicly traded firms—imagine buying a seat on a startup’s team before the company has proven itself.

Pre-IPO Transactions financial

"Series A common stock, par value $0.001 per share | 09/20/2023 | Pre-IPO Transactions"

aggregate market value financial

"1845131 | 33876605.16 | 126937933"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

equity interests financial

"Equity interests in the Issuer were purchased pre-IPO."

Equity interests are an ownership stake in a company—usually represented by shares or membership units—that give the holder a claim on the business’s profits, assets and sometimes voting power. Think of it as owning one or more slices of a company’s pie: the bigger your slice, the larger your share of dividends, capital gains and influence, and the more you are affected by dilution or company losses. Investors use equity interests to measure value, control and potential returns.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filing for KVYO disclose about planned stock sales?

The filing discloses an intent to sell 1,845,131 shares of Klaviyo’s Series A common stock. The planned sale has an aggregate market value of $33,876,605.16 and is expected to be executed through Goldman Sachs & Co. LLC on the NYSE.

How many Klaviyo (KVYO) Series A shares are outstanding according to this filing?

The document states that there are 126,937,933 shares of Klaviyo’s Series A common stock outstanding. This figure provides context for the relative size of the planned 1,845,131-share sale disclosed in the Form 144 notice.

What is the reported market value of the KVYO shares to be sold?

The planned sale of Klaviyo Series A common stock is reported at an aggregate market value of $33,876,605.16. This value corresponds to the 1,845,131 shares covered by the Form 144 notice of proposed sale.

Which broker is involved in the proposed Klaviyo (KVYO) share sale?

The proposed sale of Klaviyo Series A common stock is associated with Goldman Sachs & Co. LLC. The broker’s address is given as 200 West Street, New York, NY 10282, and the shares are indicated for trading on the NYSE.

What pre-IPO transaction activity in KVYO shares is referenced in this Form 144?

The disclosure references Pre-IPO Transactions dated September 20, 2023 involving 20,086,500 shares of Series A common stock. A note adds that equity interests in Klaviyo were purchased pre-IPO, providing historical context for current holdings.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 08/11/2026 - 06:36 PM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001634426
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	KLAVIYO, INC
SEC File Number	001-41806
Address of Issuer	125 SUMMER ST, 6TH FLOOR BOSTON MASSACHUSETTS 02110
Phone	617-213-1788
Name of Person for Whose Account the Securities are To Be Sold	Summit Partners Growth Equity Fund IX-B, L.P.
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	10% Stockholder

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Series A Common stock, par value $0.001 per share	Goldman Sachs & Co. LLC 200 West Street New York NY 10282	1845131	33876605.16	126937933	08/11/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Series A common stock, par value $0.001 per share	09/20/2023	Pre-IPO Transactions	Klaviyo, Inc.			20086500	09/20/2023	Equity interests in the Issuer were purchased pre-IPO.

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Nothing to Report

144: Remarks and Signature

Remarks
Date of Notice	08/11/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Adam Hennessey
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)