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 |
|---|---|---|---|---|---|---|
| May 26, 2026 Filed May 29, 2026 00:08 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 212,529 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000495 · wk-form4_1780013281.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 66,731,589 Underlying: Series A Common Stock · 212,529 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 |
| May 26, 2026 Filed May 29, 2026 00:08 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 212,529 | $14.61 | $3,105,048.69 |
DisclosureSEC source: 0001470831-26-000495 · wk-form4_1780013281.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: 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 $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. Read SEC document |
| May 26, 2026 Filed May 29, 2026 00:08 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 212,529 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000495 · wk-form4_1780013281.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: 212,529 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 |
| May 19, 2026 Filed May 21, 2026 00:03 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000479 · wk-form4_1779321830.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 66,944,118 Underlying: Series A Common Stock · 200,000 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 |
| May 19, 2026 Filed May 21, 2026 00:03 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 200,000 | $14.88 | $2,976,000.00 |
DisclosureSEC source: 0001470831-26-000479 · wk-form4_1779321830.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: 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 $14.68 to $15.41 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 |
| May 19, 2026 Filed May 21, 2026 00:03 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000479 · wk-form4_1779321830.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: 200,000 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 |
| May 12, 2026 Filed May 15, 2026 00:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000440 · wk-form4_1778803561.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 67,144,118 Underlying: Series A Common Stock · 200,000 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 |
| May 12, 2026 Filed May 15, 2026 00:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 141,316 | $14.46 | $2,043,429.36 |
DisclosureSEC source: 0001470831-26-000440 · wk-form4_1778803561.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 $14.30 to $14.73 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 |
| May 12, 2026 Filed May 15, 2026 00:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 58,684 | $14.97 | $878,499.48 |
DisclosureSEC source: 0001470831-26-000440 · wk-form4_1778803561.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: 141,316 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 $14.74 to $15.73 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 |
| May 12, 2026 Filed May 15, 2026 00:06 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000440 · wk-form4_1778803561.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: 200,000 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 |
| April 14, 2026 Filed Apr 17, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000375 · wk-form4_1776384250.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 67,344,118 Underlying: Series A Common Stock · 200,000 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 |
| April 14, 2026 Filed Apr 17, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 90,858 | $16.94 | $1,539,134.52 |
DisclosureSEC source: 0001470831-26-000375 · wk-form4_1776384250.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 $16.85 to $17.03 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 |
| April 14, 2026 Filed Apr 17, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 109,142 | $17.39 | $1,897,979.38 |
DisclosureSEC source: 0001470831-26-000375 · wk-form4_1776384250.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: 90,858 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 $17.035 to $18.03 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 |
| April 14, 2026 Filed Apr 17, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000375 · wk-form4_1776384250.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: 200,000 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 |
| April 07, 2026 Filed Apr 10, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000355 · wk-form4_1775779441.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 67,544,118 Underlying: Series A Common Stock · 200,000 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 |
| April 07, 2026 Filed Apr 10, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 200,000 | $18.63 | $3,726,000.00 |
DisclosureSEC source: 0001470831-26-000355 · wk-form4_1775779441.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: 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 $18.31 to $18.94 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 |
| April 07, 2026 Filed Apr 10, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000355 · wk-form4_1775779441.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: 200,000 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 |
| March 31, 2026 Filed Apr 3, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000342 · wk-form4_1775174663.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 67,744,118 Underlying: Series A Common Stock · 200,000 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 |
| March 31, 2026 Filed Apr 3, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 200,000 | $19.42 | $3,884,000.00 |
DisclosureSEC source: 0001470831-26-000342 · wk-form4_1775174663.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: 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 $18.85 to $19.75 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 |
| March 31, 2026 Filed Apr 3, 2026 00:04 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000342 · wk-form4_1775174663.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: 200,000 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 |
| March 24, 2026 Filed Mar 27, 2026 00:01 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000318 · wk-form4_1774569691.xml · derivative · entry 3 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 67,944,118 Underlying: Series A Common Stock · 200,000 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 |
| March 24, 2026 Filed Mar 27, 2026 00:01 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 200,000 | $18.17 | $3,634,000.00 |
DisclosureSEC source: 0001470831-26-000318 · wk-form4_1774569691.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: 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 $17.77 to $18.65 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 |
| March 24, 2026 Filed Mar 27, 2026 00:01 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000318 · wk-form4_1774569691.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: 200,000 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 |
| March 17, 2026 Filed Mar 19, 2026 23:59 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000299 · wk-form4_1773964773.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 68,144,118 Underlying: Series A Common Stock · 200,000 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 |
| March 17, 2026 Filed Mar 19, 2026 23:59 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 102,621 | $19.15 | $1,965,192.15 |
DisclosureSEC source: 0001470831-26-000299 · wk-form4_1773964773.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 $19.10 to $19.32 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 |
| March 17, 2026 Filed Mar 19, 2026 23:59 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 97,379 | $19.60 | $1,908,628.40 |
DisclosureSEC source: 0001470831-26-000299 · wk-form4_1773964773.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: 102,621 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 $19.33 to $20.32 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 |
| March 17, 2026 Filed Mar 19, 2026 23:59 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000299 · wk-form4_1773964773.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: 200,000 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 |
| March 10, 2026 Filed Mar 13, 2026 01:47 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 206,827 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000262 · wk-form4_1773366442.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 68,344,118 Underlying: Series A Common Stock · 206,827 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 |
| March 10, 2026 Filed Mar 13, 2026 01:47 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 700 | $19.34 | $13,538.00 |
DisclosureSEC source: 0001470831-26-000262 · wk-form4_1773366442.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 $19.28 to $19.37 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 |
| March 10, 2026 Filed Mar 13, 2026 01:47 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 206,127 | $19.96 | $4,114,294.92 |
DisclosureSEC source: 0001470831-26-000262 · wk-form4_1773366442.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: 700 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 $19.375 to $20.37 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 |
| March 10, 2026 Filed Mar 13, 2026 01:47 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 206,827 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000262 · wk-form4_1773366442.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: 206,827 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 |
| March 03, 2026 Filed Mar 6, 2026 02:32 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000247 · wk-form4_1772764346.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 68,550,945 Underlying: Series A Common Stock · 200,000 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 |
| March 03, 2026 Filed Mar 6, 2026 02:32 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 45,978 | $17.90 | $823,006.20 |
DisclosureSEC source: 0001470831-26-000247 · wk-form4_1772764346.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 $17.52 to $18.21 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 |
| March 03, 2026 Filed Mar 6, 2026 02:32 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 154,022 | $18.86 | $2,904,854.92 |
DisclosureSEC source: 0001470831-26-000247 · wk-form4_1772764346.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: 45,978 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 $18.22 to $19.21 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 |
| March 03, 2026 Filed Mar 6, 2026 02:32 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000247 · wk-form4_1772764346.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: 200,000 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 |
| February 24, 2026 Filed Feb 27, 2026 02:30 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 200,000 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000222 · wk-form4_1772159407.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 68,750,945 Underlying: Series A Common Stock · 200,000 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 |
| February 24, 2026 Filed Feb 27, 2026 02:30 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 39,644 | $16.38 | $649,368.72 |
DisclosureSEC source: 0001470831-26-000222 · wk-form4_1772159407.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 $15.83 to $16.53 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 |
| February 24, 2026 Filed Feb 27, 2026 02:30 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 160,356 | $16.86 | $2,703,602.16 |
DisclosureSEC source: 0001470831-26-000222 · wk-form4_1772159407.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: 39,644 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 $16.535 to $17.53 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 |
| February 24, 2026 Filed Feb 27, 2026 02:30 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 200,000 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000222 · wk-form4_1772159407.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: 200,000 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 |
| January 27, 2026 Filed Jan 29, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 155,219 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000061 · wk-form4_1769722181.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 68,950,945 Underlying: Series A Common Stock · 155,219 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 27, 2026 Filed Jan 29, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 4,530 | $24.94 | $112,978.20 |
DisclosureSEC source: 0001470831-26-000061 · wk-form4_1769722181.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 $24.82 to $25.00 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. Read SEC document |
| January 27, 2026 Filed Jan 29, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 150,689 | $25.34 | $3,818,459.26 |
DisclosureSEC source: 0001470831-26-000061 · wk-form4_1769722181.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: 4,530 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 $25.01 to $26.00 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. Read SEC document |
| January 27, 2026 Filed Jan 29, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 155,219 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000061 · wk-form4_1769722181.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: 155,219 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 20, 2026 Filed Jan 22, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 167,926 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000051 · wk-form4_1769117357.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,106,164 Underlying: Series A Common Stock · 167,926 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 20, 2026 Filed Jan 22, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 796 | $23.29 | $18,538.84 |
DisclosureSEC source: 0001470831-26-000051 · wk-form4_1769117357.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 $23.15 to $23.46 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 20, 2026 Filed Jan 22, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 167,130 | $24.16 | $4,037,860.80 |
DisclosureSEC source: 0001470831-26-000051 · wk-form4_1769117357.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: 796 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 $23.48 to $24.46 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 20, 2026 Filed Jan 22, 2026 21:29 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries A Common Stock | 167,926 | Not disclosed | Not disclosed |
DisclosureSEC source: 0001470831-26-000051 · wk-form4_1769117357.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: 167,926 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 13, 2026 Filed Jan 15, 2026 23:02 UTC | Klaviyo, Inc. KVYO · Entity 3775 | ConversionSeries B Common Stock · Derivative | 140,646 | $0.00 | $0.00 |
DisclosureSEC source: 0001470831-26-000037 · wk-form4_1768518127.xml · derivative · entry 4 Bialecki Andrew · CIK 0001991099 · Director · Co-Chief Executive Officer · 10% owner 10b5-1 filing: Plan reported Ownership: Direct Disclosed balance after: 69,274,090 Underlying: Series A Common Stock · 140,646 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 13, 2026 Filed Jan 15, 2026 23:02 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 90,327 | $27.29 | $2,465,023.83 |
DisclosureSEC source: 0001470831-26-000037 · wk-form4_1768518127.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 $27.10 to $27.42 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 |
| January 13, 2026 Filed Jan 15, 2026 23:02 UTC | Klaviyo, Inc. KVYO · Entity 3775 | SaleSeries A Common Stock | 50,319 | $27.62 | $1,389,810.78 |
DisclosureSEC source: 0001470831-26-000037 · wk-form4_1768518127.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: 90,327 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 $27.425 to $28.42 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 |
Value uses the disclosed total when available, otherwise shares × reported transaction price. It is not an estimate of exercise cash cost or investment performance.