Klaviyo's Edward Hallen plans sale of 1,300 shares

The notice separates the planned shares between Hodgkins LLC and Hodgkins Trust and includes each entity’s sales during the prior three months.

Available on EDGAR 09/24/2026 - 04:13 PM EDT Accepted by SEC EDGAR 09/24/2026 - 04:12 PM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

Klaviyo, Inc. (KVYO) is the issuer named in a Form 144 notice identifying Edward W. Hallen as the person for whose account 1,300 Class A shares are to be sold, with an aggregate market value of $22,124.00 and an approximate sale date of September 24, 2026. The notice attributes 800 shares to Hodgkins LLC and 500 to Hodgkins Trust; Hallen is identified as an account stakeholder in both. Past-three-month sales dated August 31, 2026, list 59,615 shares ($1,221,349.02) for the LLC and 39,167 shares ($801,622.32) for the trust. Daniel Tucci signed as Fidelity Brokerage Services LLC’s authorized representative and Hallen’s attorney-in-fact.

Key Figures

Shares to be sold: 1,300 Class A shares Aggregate market value: $22,124.00 Hodgkins LLC shares to be sold: 800 shares +5 more

8 metrics

Shares to be sold 1,300 Class A shares Approximate sale date September 24, 2026

Aggregate market value $22,124.00 Class A shares to be sold

Hodgkins LLC shares to be sold 800 shares Class A shares

Hodgkins Trust shares to be sold 500 shares Class A shares

Hodgkins LLC prior sales 59,615 shares Sales during the past three months; dated August 31, 2026

Hodgkins LLC prior sales aggregate market value $1,221,349.02 Sales during the past three months; dated August 31, 2026

Hodgkins Trust prior sales 39,167 shares Sales during the past three months; dated August 31, 2026

Hodgkins Trust prior sales aggregate market value $801,622.32 Sales during the past three months; dated August 31, 2026

Key Terms

Rule 144, Founders Shares, attorney-in-fact

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.

Founders Shares financial

"Founders Shares | Issuer"

Founders shares are a special block of a company’s stock originally given to the people who started the business; they often carry extra voting power or favorable terms compared with regular shares. For investors, these shares matter because they concentrate control and influence how future funding, ownership dilution, and decision-making will play out—think of founders shares as the steering wheel that can steer a company’s direction even as more passengers (investors) climb aboard.

attorney-in-fact regulatory

"as attorney-in-fact for Edward Hallen"

An attorney-in-fact is the person or entity given legal authority through a power of attorney to act on behalf of another for specific tasks, such as signing documents, voting shares, or handling transactions. For investors, this matters because it lets a trusted representative make timely decisions or complete paperwork when the owner cannot, much like handing keys to someone to run errands on your behalf—so checks on scope and limits of that authority are important.

FAQ

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

How many KVYO shares does Edward W. Hallen plan to sell?

The notice identifies 1,300 Class A shares for sale, with an aggregate market value of $22,124.00 and an approximate sale date of September 24, 2026. It attributes 800 shares to Hodgkins LLC and 500 shares to Hodgkins Trust.

What did Hodgkins LLC and Hodgkins Trust sell in the prior three months?

For August 31, 2026, the table lists 59,615 Class A shares and $1,221,349.02 for Hodgkins LLC, and 39,167 Class A shares and $801,622.32 for Hodgkins Trust.

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

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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	1300	22124.00	126937933	09/24/2026	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	Founders Shares	Issuer			1300	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

144: Remarks and Signature

Remarks	Today's sale includes 800 shares sold from Hodgkins Llc, of which Edward W Hallen is an authorized individual and account stakeholder; and 500 shares sold from Hodgkins Trust, of which Edward W. Hallen is an account stakeholder.
Date of Notice	09/24/2026
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)