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BCS

Notice of Proposed Sale · 144

Klaviyo, Inc.

KVYONYSEEQUITYCurrent

Notice of Proposed Sale

Filed Aug 28, 2026Accepted Aug 28, 2026, 12:26 PM EDTFiling CIK 1991399Accession 0001950047-26-008818
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Structured filing — 144

primary_doc.xml

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Notice of proposed sale. The proposed amounts below do not establish that a sale occurred.

Proposed-sale notice

Issuer
Klaviyo, Inc.
Issuer CIK
0001835830
SEC file number
001-41806
Phone
6172131788
Person for whose account securities are to be sold
LANDON EDMOND
Relationships to issuer
Officer
Street
125 Summer Street, 6th Floor
City
Boston
State / country code
MA
Postal code
02110

Securities proposed for sale

Securities proposed for sale · 1 reported row
SecurityProposed unitsAggregate market valueUnits outstandingApproximate sale dateExchangeBroker / market maker
Common53,4731,048,605.53126,937,93308/28/2026NYSEMorgan Stanley Smith Barney LLC Executive Financial Services

Broker / market maker — proposed row 1, entry 1

Name
Morgan Stanley Smith Barney LLC Executive Financial Services
Street
1 New York Plaza
Street (continued)
8th Floor
City
New York
State / country code
NY
Postal code
10004

Acquisition of securities to be sold

Acquisition of securities to be sold · 1 reported row
SecurityAcquiredNature of acquisitionAcquired fromAmount acquiredGift transactionPayment dateNature of payment
Common09/19/2023Restricted Stock UnitsIssuer53,473N09/19/2023N/A

Prior-sale reporting

Nothing to report for the preceding three months
Y

Remarks

The securities to be sold were acquired upon the vesting of restricted stock units during the period of 9/19/2023 through 08/15/2026

Notice signature

Notice date
08/28/2026
Signed
/s/ Landon Edmond
Plan adoption dates
08/21/2025

Company context

Current securities

Recent company filings

  1. 144 filingSep 17, 2026
  2. 144 filingAug 31, 2026
  3. 4 filingAug 18, 2026
  4. 4 filingAug 18, 2026
  5. 144 filingAug 11, 2026

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