Klaviyo: $1.70M share sale listed for Hallen

Four earlier Class A transactions from Hodgkins LLC and Hodgkins Trust are listed for August 31 and September 24, 2026.

Rhea-AI Filing Summary

Klaviyo, Inc. Class A shares are listed for sale for Edward W. Hallen’s account: 97,482 shares, with an approximate sale date of October 7, 2026 and an aggregate market value of $1,696,066.56. Remarks say “today’s sale” includes 38,667 shares sold from Hodgkins LLC and 58,815 sold from Hodgkins Trust; Edward W. Hallen is identified as an authorized individual and account stakeholder for the LLC and an account stakeholder for the trust.

Key Figures

Class A shares listed for sale: 97,482 shares Aggregate market value: $1,696,066.56 Shares outstanding: 126,937,933 shares +4 more

7 metrics

Class A shares listed for sale 97,482 shares For Edward W. Hallen’s account; approximate sale date October 7, 2026

Aggregate market value $1,696,066.56 For the 97,482 Class A shares listed for sale

Shares outstanding 126,937,933 shares As listed in the sale notice

Prior sale through Hodgkins LLC 59,615 shares August 31, 2026

Prior sale through Hodgkins Trust 39,167 shares August 31, 2026

Prior sale through Hodgkins LLC 800 shares September 24, 2026

Prior sale through Hodgkins Trust 500 shares September 24, 2026

Key Terms

Rule 144, Founder's Shares, account stakeholder

3 terms

Rule 144 regulatory

"the definition of "person" in paragraph (a) of Rule 144"

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Founder's Shares technical

"Founder's Shares"

account stakeholder technical

"of which Edward W. Hallen is an account stakeholder"

FAQ

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

What prior KVYO stock sales does the notice list?

The notice lists 59,615 Class A shares sold through Hodgkins LLC on August 31, 2026, for $1,221,349.02; 39,167 through Hodgkins Trust that date for $801,622.32; 800 through Hodgkins LLC on September 24, 2026, for $13,614.50; and 500 through Hodgkins Trust that date for $8,509.50.

What broker and exchange are listed for the KVYO sale?

The notice lists Fidelity Brokerage Services LLC as the broker and NYSE as the exchange for the Class A shares, with an approximate sale date of October 7, 2026.

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

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Available on EDGAR 10/07/2026 - 04:13 PM Accepted by SEC EDGAR 10/07/2026 - 04:12 PM 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	0001991125
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 STREET, FLOOR 6 BOSTON MASSACHUSETTS 02110
Phone	800-338-1744
Name of Person for Whose Account the Securities are To Be Sold	Hallen Ed
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	Officer
Relationship to Issuer	Director

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
Class A	Fidelity Brokerage Services LLC 900 Salem Street Smithfield RI 02917	97482	1696066.56	126937933	10/07/2026	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 *
Class A	09/25/2012	Founder's Shares	Issuer			97482	09/25/2012	Compensation

* 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

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Hodgkins Llc 125 Summer Street 6th Floor Boston MA 02110	Class A	08/31/2026	59615	1221349.02
Hodgkins Trust 125 Summer Street 6th Floor Boston MA 02110	Class A	08/31/2026	39167	801622.32
Hodgkins Llc 125 Summer Street 6th Floor Boston MA 02110	Class A	09/24/2026	800	13614.50
Hodgkins Trust 125 Summer Street 6th Floor Boston MA 02110	Class A	09/24/2026	500	8509.50

144: Remarks and Signature

Remarks	Today's sale includes 38667 shares sold from Hodgkins Llc, of which Edward W Hallen is an authorized individual and account stakeholder; and 58815 shares sold from Hodgkins Trust, of which Edward W. Hallen is an account stakeholder. Trades in the past 3 months are also from these accounts.
Date of Notice	10/07/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	06/01/2026
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	/s/ Daniel Tucci, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Edward Hallen
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)