Reported relationships
Latest disclosed role at each company.
| Company | Last reported as | Report date | Published |
|---|---|---|---|
| Klaviyo, Inc.KVYO · Entity 3775 | Director · Co-Chief Executive Officer · 10% owner | May 26, 2026 | May 29, 2026 |
Disclosed balances
About these balances
Latest available filing per company, not a reconstructed current portfolio. Matching sequences show the last reported balance with all source rows expandable; grouping alone does not establish account ownership. Do not add unresolved positions together. Filings may omit unchanged positions, and amendments may correct only part of an older disclosure. Jointly reported shares are not necessarily this owner's personal holdings.
Klaviyo, Inc.
Report date May 26, 2026 · Filed May 29, 2026
| Security / award | Ownership account | Disclosed shares / units | Disclosure context |
|---|---|---|---|
| Series A Common StockSEC Table I · non-derivative | Direct | 0 |
Ending reported balance
After 2026-05-26 transaction · row 2
2 source rows · reconciled sequenceRow 1 · 2026-05-26 · Conversion · Acquired 212,529 · Balance 212,529 F1: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Row 2 · 2026-05-26 · Sale · Disposed 212,529 · Balance 0 F1: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $14.43 to $15.00 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. |
| Series B Common StockSEC Table II · derivative / convertible security | Direct | 66,731,589 |
Reported balance
After 2026-05-26 transaction · row 3
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 3 · 2026-05-26 · Conversion · Disposed 212,529 · Balance 66,731,589 F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. |
| Series B Common StockSEC Table II · derivative / convertible security | IndirectBy The Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023 | 7,517,410 |
Reported balance
Holding disclosure · report date 2026-05-26 · row 4
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 4 · Balance 7,517,410 F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F4: Shares held by the Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023, of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose. |
| Series B Common StockSEC Table II · derivative / convertible security | IndirectBy The Elizabeth L. Bialecki Irrevocable GST Trust of 2023 | 517,006 |
Reported balance
Holding disclosure · report date 2026-05-26 · row 5
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 5 · Balance 517,006 F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F5: Shares held by the Elizabeth L. Bialecki Irrevocable GST Trust of 2023, of which the Reporting Person serves as a trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose. |
| Series B Common StockSEC Table II · derivative / convertible security | IndirectBy The Andrew P. Bialecki Irrevocable GST Trust of 2023 | 517,006 |
Reported balance
Holding disclosure · report date 2026-05-26 · row 6
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 6 · Balance 517,006 F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F6: Shares held by the Andrew P. Bialecki Irrevocable GST Trust of 2023, of which the Reporting Person's spouse serves as a trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose. |
| Series B Common StockSEC Table II · derivative / convertible security | IndirectBy spouse | 43,218 |
Reported balance
Holding disclosure · report date 2026-05-26 · row 7
Instrument identity requires review; Table II rows are not merged.
1 source rowRow 7 · Balance 43,218 F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. |
Filing footnotes · ownership attribution and instrument terms
F1: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025.
F2: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date.
F3: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $14.43 to $15.00 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.
F4: Shares held by the Andrew P. Bialecki Grantor Retained Annuity Trust I of 2023, of which the Reporting Person serves as trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose.
F5: Shares held by the Elizabeth L. Bialecki Irrevocable GST Trust of 2023, of which the Reporting Person serves as a trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose.
F6: Shares held by the Andrew P. Bialecki Irrevocable GST Trust of 2023, of which the Reporting Person's spouse serves as a trustee. The Reporting Person disclaims Section 16 beneficial ownership of such shares except to the extent of his pecuniary interest therein, if any, and this report shall not be deemed to be an admission that he has beneficial ownership of such shares for Section 16 or any other purpose.
Transaction history
JSON APIPurchases/sales include open-market and private transactions. Plan disclosure applies to the filing; individual rows may differ. “Not disclosed” is not “unplanned.”
The cutoff filters transaction history only. Company summaries and owner relationships show the latest available disclosures. Parser corrections can improve historical records.
| Transaction date | Company | Activity / security | Shares / units | Reported price | Reported value | Details |
|---|---|---|---|---|---|---|
| January 13, 2026 Filed Jan 15, 2026 23:02 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 140,646 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000037 · wk-form4_1768518127.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 140,646 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| January 07, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 16,649 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · derivative · entry 7 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,414,736 Underlying: Series A Common Stock · 16,649 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| January 07, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 16,649 | $30.01 | $499,636.49 |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · nonDerivative · entry 5 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F5 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.00 to $30.06 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. Read SEC document |
| January 07, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 16,649 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · nonDerivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 16,649 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| January 06, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 137,504 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · derivative · entry 6 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,431,385 Underlying: Series A Common Stock · 137,504 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| January 06, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 2,382 | $28.52 | $67,934.64 |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · nonDerivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.42 to $28.54 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. Read SEC document |
| January 06, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 135,122 | $28.92 | $3,907,728.24 |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 2,382 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.545 to $29.54 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. Read SEC document |
| January 06, 2026 Filed Jan 8, 2026 21:31 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 137,504 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000022 · wk-form4_1767907885.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 137,504 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 22, 2025 Filed Dec 23, 2025 21:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 100,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000452 · wk-form4_1766523997.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,568,889 Underlying: Series A Common Stock · 100,000 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 22, 2025 Filed Dec 23, 2025 21:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 6,934 | $31.94 | $221,471.96 |
DisclosureSEC source: 0001470831-25-000452 · wk-form4_1766523997.xml · nonDerivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $31.57 to $32.30 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. Read SEC document |
| December 22, 2025 Filed Dec 23, 2025 21:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 93,066 | $33.05 | $3,075,831.30 |
DisclosureSEC source: 0001470831-25-000452 · wk-form4_1766523997.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 6,934 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $32.38 to $33.35 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. Read SEC document |
| December 22, 2025 Filed Dec 23, 2025 21:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 100,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000452 · wk-form4_1766523997.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 100,000 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 17, 2025 Filed Dec 17, 2025 22:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 100,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000431 · wk-form4_1766010254.xml · derivative · entry 6 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,668,889 Underlying: Series A Common Stock · 100,000 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 17, 2025 Filed Dec 17, 2025 22:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 100,000 | $30.40 | $3,040,000.00 |
DisclosureSEC source: 0001470831-25-000431 · wk-form4_1766010254.xml · nonDerivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.00 to $30.71 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. Read SEC document |
| December 17, 2025 Filed Dec 17, 2025 22:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 100,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000431 · wk-form4_1766010254.xml · nonDerivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 100,000 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 16, 2025 Filed Dec 17, 2025 22:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 138,648 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000431 · wk-form4_1766010254.xml · derivative · entry 5 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,768,889 Underlying: Series A Common Stock · 138,648 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 16, 2025 Filed Dec 17, 2025 22:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 138,648 | $29.04 | $4,026,337.92 |
DisclosureSEC source: 0001470831-25-000431 · wk-form4_1766010254.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.58 to $29.42 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. Read SEC document |
| December 16, 2025 Filed Dec 17, 2025 22:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 138,648 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000431 · wk-form4_1766010254.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 138,648 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 11, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 3,419,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · derivative · entry 13 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,907,537 Underlying: Series A Common Stock · 3,419,000 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 11, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 17,777 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · derivative · entry 12 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,326,537 Underlying: Series A Common Stock · 17,777 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 11, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | GiftSeries A Common Stock | 3,419,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 9 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F7 · kind: Represents a bona fide gift of 3,419,000 shares of stock from the Reporting Person to a donor-advised fund. The Reporting Person directed the transfer of 3,419,000 shares of their Series B Common Stock, resulting in the automatic conversion of the shares into Series A Common Stock upon execution of the transfer pursuant to the Issuer's certificate of incorporation. Read SEC document |
| December 11, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 3,419,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 8 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 3,419,000 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F6 · price: The Reporting Person directed the transfer of 3,419,000 shares of their Series B Common Stock in connection with a bona fide gift to a donor-advised fund, resulting in the automatic conversion of the shares into Series A Common Stock upon execution of the transfer pursuant to the Issuer's certificate of incorporation. Read SEC document |
| December 11, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 17,777 | $30.00 | $533,310.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 7 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. Read SEC document |
| December 11, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 17,777 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 6 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 17,777 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 10, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 82,223 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · derivative · entry 11 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,344,314 Underlying: Series A Common Stock · 82,223 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 10, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 82,223 | $30.12 | $2,476,556.76 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 5 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F5 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $30.00 to $30.45 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. Read SEC document |
| December 10, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 82,223 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 82,223 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 09, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 131,362 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · derivative · entry 10 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,426,537 Underlying: Series A Common Stock · 131,362 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 09, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 800 | $28.84 | $23,072.00 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F4 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.81 to $28.89 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. Read SEC document |
| December 09, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 130,562 | $29.42 | $3,841,134.04 |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 800 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.92 to $29.89 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. Read SEC document |
| December 09, 2025 Filed Dec 11, 2025 21:22 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 131,362 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000395 · wk-form4_1765488141.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 131,362 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 04, 2025 Filed Dec 4, 2025 23:50 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 952 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000382 · wk-form4_1764892241.xml · derivative · entry 6 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,557,899 Underlying: Series A Common Stock · 952 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 04, 2025 Filed Dec 4, 2025 23:50 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 952 | $30.00 | $28,560.00 |
DisclosureSEC source: 0001470831-25-000382 · wk-form4_1764892241.xml · nonDerivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. Read SEC document |
| December 04, 2025 Filed Dec 4, 2025 23:50 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 952 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000382 · wk-form4_1764892241.xml · nonDerivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 952 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 02, 2025 Filed Dec 4, 2025 23:50 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 142,045 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000382 · wk-form4_1764892241.xml · derivative · entry 5 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,558,851 Underlying: Series A Common Stock · 142,045 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| December 02, 2025 Filed Dec 4, 2025 23:50 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 142,045 | $28.62 | $4,065,327.90 |
DisclosureSEC source: 0001470831-25-000382 · wk-form4_1764892241.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $28.20 to $28.87 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. Read SEC document |
| December 02, 2025 Filed Dec 4, 2025 23:50 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 142,045 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000382 · wk-form4_1764892241.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 142,045 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| November 24, 2025 Filed Nov 26, 2025 21:12 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 144,717 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000372 · wk-form4_1764191533.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,700,896 Underlying: Series A Common Stock · 144,717 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| November 24, 2025 Filed Nov 26, 2025 21:12 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 144,717 | $27.76 | $4,017,343.92 |
DisclosureSEC source: 0001470831-25-000372 · wk-form4_1764191533.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $27.39 to $28.20 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. Read SEC document |
| November 24, 2025 Filed Nov 26, 2025 21:12 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 144,717 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000372 · wk-form4_1764191533.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 144,717 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| November 18, 2025 Filed Nov 20, 2025 21:10 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 147,329 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000359 · wk-form4_1763673005.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,845,613 Underlying: Series A Common Stock · 147,329 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| November 18, 2025 Filed Nov 20, 2025 21:10 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 147,329 | $27.16 | $4,001,455.64 |
DisclosureSEC source: 0001470831-25-000359 · wk-form4_1763673005.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $26.62 to $27.59 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. Read SEC document |
| November 18, 2025 Filed Nov 20, 2025 21:10 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 147,329 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000359 · wk-form4_1763673005.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 147,329 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| November 11, 2025 Filed Nov 13, 2025 21:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 140,464 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000313 · wk-form4_1763069095.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 73,992,942 Underlying: Series A Common Stock · 140,464 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| November 11, 2025 Filed Nov 13, 2025 21:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 140,464 | $29.74 | $4,177,399.36 |
DisclosureSEC source: 0001470831-25-000313 · wk-form4_1763069095.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $29.21 to $30.01 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. Read SEC document |
| November 11, 2025 Filed Nov 13, 2025 21:24 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 140,464 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000313 · wk-form4_1763069095.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 140,464 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| October 14, 2025 Filed Oct 16, 2025 20:09 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 163,331 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-25-000260 · wk-form4_1760645384.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 74,133,406 Underlying: Series A Common Stock · 163,331 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| October 14, 2025 Filed Oct 16, 2025 20:09 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 163,331 | $24.37 | $3,980,376.47 |
DisclosureSEC source: 0001470831-25-000260 · wk-form4_1760645384.xml · nonDerivative · entry 2 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 0 F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F3 · price: The price reported in Column 4 is a weighted average price. The shares were sold in multiple transactions at prices ranging from $23.67 to $24.655 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. Read SEC document |
| October 14, 2025 Filed Oct 16, 2025 20:09 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 163,331 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-25-000260 · wk-form4_1760645384.xml · nonDerivative · entry 1 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 163,331 Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
| October 07, 2025 Filed Oct 9, 2025 20:01 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 159,508 | $0.00 | $0.00 |
DisclosureSEC source: 0001991099-25-000003 · wk-form4_1760040098.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 74,296,737 Underlying: Series A Common Stock · 159,508 shares Expires not disclosed Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event. F2 · derivative.exercise_price: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F1 · kind: These transactions were effected by the Reporting Person pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 20, 2025. F2 · derivative.exercise_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. F2 · derivative.expiration_date: Each share of the Issuer's Series B Common Stock, par value $0.001 per share ("Series B Common Stock"), is convertible at any time at the option of the holder into one share of the Issuer's Series A Common Stock, par value $0.001 per share ("Series A Common Stock"), and will automatically convert into one share of Series A Common Stock upon the occurrence of certain events as set forth in the Issuer's certificate of incorporation. The Series B Common Stock has no expiration date. Read SEC document |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.