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  4. [Form 4] Klaviyo, Inc. Insider Trading Activity

Klaviyo's Edmond Landon sells 61,576 shares

After the August 31, 2026 sale, Landon reported holdings of 50,886 shares plus 297,110 RSUs and 129,870 PSUs.

Filing Impact
(Very High)
Filing Sentiment
(Negative)
Form Type
4

Rhea-AI Filing Summary

Klaviyo, Inc. (KVYO) reported that Chief Legal Officer Edmond Landon sold shares of the company’s Series A Common Stock in two open-market transactions made under Rule 10b5-1 trading plans. On August 28, 2026, Landon sold 53,473 shares at a weighted average price of $20.01 per share, with individual trades ranging from $20.00 to $20.15 per share, pursuant to a trading plan adopted on August 21, 2025. On August 31, 2026, he sold an additional 8,103 shares at a weighted average price of $20.44 per share, with trades ranging from $19.95 to $20.77 per share, under a trading plan adopted on June 1, 2026.

After these transactions, Landon’s reported position consists of 50,886 shares of Series A Common Stock, 297,110 unvested restricted stock units and 129,870 unvested performance stock units, each RSU or PSU representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement.

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Insights

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Insider Edmond Landon
Role Chief Legal Officer
Sold 61,576 shs ($1.24M)
Type Security Shares Price Value
Sale Series A Common Stock F3, F4, F5 8,103 $20.44 $166K
Sale Series A Common Stock F1, F2 53,473 $20.01 $1.07M
Holdings After Transaction: Series A Common Stock — 477,866 shares (Direct)
Footnotes (5)
  1. F1. These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 21, 2025.
  2. F2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $20.00 to $20.15 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
  3. F3. These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1, 2026.
  4. F4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $19.95 to $20.77 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
  5. F5. Consists of (i) 50,886 shares of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), (ii) 297,110 unvested restricted stock units awarded under the Issuer's 2023 Stock Option and Incentive Plan (the "Plan"), each representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement, and (iii) 129,870 unvested performance stock units awarded under the Plan, each representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement.
Shares sold August 28, 2026 53,473 shares Open-market sale of Series A Common Stock under Rule 10b5-1 plan adopted August 21, 2025
Weighted average sale price August 28, 2026 $20.01 per share Shares sold in multiple transactions at prices from $20.00 to $20.15 per share
Shares sold August 31, 2026 8,103 shares Open-market sale of Series A Common Stock under Rule 10b5-1 plan adopted June 1, 2026
Weighted average sale price August 31, 2026 $20.44 per share Shares sold in multiple transactions at prices from $19.95 to $20.77 per share
Total shares sold in Form 4 61,576 shares Aggregate net-sell volume across reported transactions
Common shares held after transactions 50,886 shares Series A Common Stock directly held by the reporting person after the August 31, 2026 transaction
Unvested restricted stock units 297,110 RSUs Unvested RSUs under the 2023 Stock Option and Incentive Plan, each for one share upon vesting and settlement
Unvested performance stock units 129,870 PSUs Unvested PSUs under the 2023 Stock Option and Incentive Plan, each for one share upon vesting and settlement
Rule 10b5-1 trading plan regulatory
"These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted"
A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
restricted stock units financial
"297,110 unvested restricted stock units awarded under the Issuer's 2023 Stock Option and Incentive Plan"
Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.
performance stock units financial
"129,870 unvested performance stock units awarded under the Plan"
Performance stock units are a type of company award that grants employees shares of stock only if certain performance goals are met. They motivate employees to work toward specific company achievements, aligning their interests with those of shareholders. For investors, they can influence a company's future stock supply and reflect management’s confidence in reaching key targets.
contingent right to receive one share financial
"each representing the contingent right to receive one share of Series A Common Stock"

FAQ

What insider transactions did Edmond Landon report in KVYO shares?
Edmond Landon reported two open-market sales of Klaviyo Series A Common Stock, totaling 61,576 shares, on August 28, 2026 and August 31, 2026, both executed under Rule 10b5-1 trading plans.

How many KVYO shares did Edmond Landon sell on August 28, 2026?
On August 28, 2026, Edmond Landon sold 53,473 shares of Klaviyo Series A Common Stock at a weighted average price of $20.01 per share, with sale prices ranging from $20.00 to $20.15 per share, under a Rule 10b5-1 trading plan.

What were the details of Edmond Landon’s August 31, 2026 KVYO stock sale?
On August 31, 2026, Edmond Landon sold 8,103 shares of Klaviyo Series A Common Stock at a weighted average price of $20.44 per share, with trades between $19.95 and $20.77 per share, under a Rule 10b5-1 trading plan adopted on June 1, 2026.

Were Edmond Landon’s KVYO stock sales made under Rule 10b5-1 trading plans?
Yes. Both reported sales were effected under Rule 10b5-1 trading plans: the August 28, 2026 sale under a plan adopted on August 21, 2025, and the August 31, 2026 sale under a plan adopted on June 1, 2026.

What KVYO equity holdings does Edmond Landon report after these sales?
Following the reported sales, Edmond Landon reports holdings of 50,886 shares of Klaviyo Series A Common Stock, plus 297,110 unvested restricted stock units and 129,870 unvested performance stock units, each unit representing the contingent right to receive one share upon vesting and settlement.

How many KVYO shares did Edmond Landon sell in total in this Form 4?
In total, Edmond Landon sold 61,576 shares of Klaviyo Series A Common Stock, consisting of 53,473 shares sold on August 28, 2026 and 8,103 shares sold on August 31, 2026, as summarized in the filing’s transaction totals.

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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
X
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Edmond Landon
(Last)(First)(Middle)
C/O KLAVIYO, INC.
125 SUMMER STREET, 6TH FLOOR
(Street)
BOSTON MASSACHUSETTS 02110
(City)(State)(Zip)
UNITED STATES
(Country)		2. Issuer Name and Ticker or Trading Symbol
Klaviyo, Inc. [ KVYO ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Legal Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/28/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Series A Common Stock08/28/2026S(1)53,473D$20.01(2)485,969D
Series A Common Stock08/31/2026S(3)8,103D$20.44(4)477,866(5)D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Explanation of Responses:
1. These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on August 21, 2025.
2. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $20.00 to $20.15 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
3. These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1, 2026.
4. The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $19.95 to $20.77 per share. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in this footnote.
5. Consists of (i) 50,886 shares of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), (ii) 297,110 unvested restricted stock units awarded under the Issuer's 2023 Stock Option and Incentive Plan (the "Plan"), each representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement, and (iii) 129,870 unvested performance stock units awarded under the Plan, each representing the contingent right to receive one share of Series A Common Stock upon vesting and settlement.
Remarks:
/s/ Landon Edmond09/01/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR