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Klaviyo, Inc. planned insider sales

In the last twelve months insiders at Klaviyo, Inc. filed 34 Form 144 notices of planned sales, 9.3 million shares worth $184.3 million at the time of filing, from 14 sellers. The latest, filed 7 October 2026: Hallen Ed (officer, director), 97,482 shares worth $1.7 million, planned for around 7 October 2026 through Fidelity Brokerage Services LLC.

FiledSellerRelationshipSharesValuePlanned saleSold, per Form 4BrokerHow acquiredFiling
7 October 2026Hallen EdOfficer, Director97,482$1.7 million7 October 202697,482 shares from 7 October 2026Fidelity Brokerage Services LLCFounder's SharesForm 144
24 September 2026Hallen EdOfficer, Director1,300$22,12424 September 20261,300 shares from 24 September 2026Fidelity Brokerage Services LLCFounders SharesForm 144
17 September 2026Amanda WhalenOfficer42,000$681,66017 September 2026None on Form 4 yetMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
11 September 2026St. Ledger SusanDirector2,328$37,08511 September 20262,328 shares from 11 September 2026Fidelity Brokerage Services LLCRestricted Stock VestingForm 144
31 August 2026Landon Ramon EdmondOfficer8,103$163,27531 August 20268,103 shares from 31 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
31 August 2026Hallen EdOfficer, Director98,782$2.0 million31 August 202698,782 shares from 31 August 2026Fidelity Brokerage Services LLCFounders SharesForm 144
28 August 2026Landon EdmondOfficer53,473$1.0 million28 August 202653,473 shares from 28 August 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
11 August 2026Summit Investors GE IX/VC IV (UK), L.P.10% Stockholder2,016$37,01411 August 2026None on Form 4 yetGoldman Sachs & Co. LLCPre-IPO TransactionsForm 144
11 August 2026Summit Investors GE IX-VC IV, LLC10% Stockholder15,531$285,14911 August 2026None on Form 4 yetGoldman Sachs & Co. LLCPre-IPO TransactionsForm 144
11 August 2026Summit Partners Co-Invest (Kiwi) L.P.10% Stockholder182,210$3.3 million11 August 2026None on Form 4 yetGoldman Sachs & Co. LLCPre-IPO TransactionsForm 144
11 August 2026Summit Partners Growth Equity Fund IX-B, L.P.10% Stockholder1,845,131$33.9 million11 August 2026None on Form 4 yetGoldman Sachs & Co. LLCPre-IPO TransactionsForm 144
11 August 2026Summit Partners Growth Equity Fund IX-A, L.P.10% Stockholder2,955,112$54.3 million11 August 20265,000,000 shares from 11 August 2026Goldman Sachs & Co. LLCPre-IPO TransactionsForm 144
18 June 2026Amanda WhalenOfficer42,000$565,32018 June 202642,000 shares from 18 June 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
26 May 2026Andrew BialeckiDirector, Officer, 10% Stockholder212,529$3.2 million26 May 2026212,529 shares from 26 May 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPreviously Exercised Stock OptionsForm 144
18 May 2026St. Ledger SusanDirector9,334$133,19618 May 20269,334 shares from 18 May 2026Fidelity Brokerage Services LLCRestricted Stock VestingForm 144
20 April 2026Landon Ramon EdmondOfficer9,623$179,66120 April 20269,623 shares from 20 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
16 April 2026Amanda WhalenOfficer28,000$514,36016 April 202628,000 shares from 16 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
7 April 2026Andrew BialeckiDirector, Officer, 10% Stockholder637,778$12.3 million7 April 2026800,000 shares from 7 April 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPreviously Exercised Stock OptionsForm 144
17 March 2026Stephen E. RowlandOfficer4,940$94,84817 March 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
12 March 2026Landon Ramon EdmondOfficer14,366$285,30912 March 202614,366 shares from 12 March 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
5 March 2026Stephen E. RowlandOfficer4,940$96,4785 March 2026No matching Form 4 saleMorgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
24 February 2026Andrew BialeckiDirector, Officer, 10% Stockholder1,350,000$21.4 million24 February 20261,206,827 shares from 24 February 2026Morgan Stanley Smith Barney LLC Executive Financial ServicesPreviously Exercised Stock OptionsForm 144
18 December 2025Landon Ramon EdmondOfficer39,283$1.2 million18 December 202539,283 shares from 18 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
18 December 2025Amanda WhalenOfficer56,000$1.7 million18 December 202556,000 shares from 18 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
17 December 2025Hallen EdOfficer, Director117,550$3.6 million17 December 2025117,550 shares from 17 December 2025Fidelity Brokerage Services LLCFounder SharesForm 144
15 December 2025Hallen EdOfficer, Director757$22,82315 December 2025757 shares from 15 December 2025Fidelity Brokerage Services LLCFounders SharesForm 144
15 December 2025Stephen RowlandOfficer14,208$423,96715 December 20257,104 shares from 15 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
2 December 2025Andrew BialeckiDirector, Officer, 10% Stockholder1,350,000$38.0 million2 December 20251,330,951 shares from 2 December 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesPreviously Exercised Stock OptionsForm 144
20 November 2025Landon Ramon EdmondOfficer14,394$396,41120 November 202514,394 shares from 20 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
17 November 2025Stephen RowlandOfficer7,104$203,24517 November 20257,104 shares from 17 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
17 November 2025Galvin CarmelOfficer11,156$319,28517 November 202511,156 shares from 17 November 2025Fidelity Brokerage Services LLCRestricted Stock VestingForm 144
14 November 2025Amanda WhalenOfficer15,000$427,20014 November 202515,000 shares from 14 November 2025Morgan Stanley Smith Barney LLC Executive Financial ServicesRestricted Stock UnitsForm 144
12 November 2025Hallen EdOfficer, Director2,811$84,33211 November 20252,811 shares from 11 November 2025Fidelity Brokerage Services LLCFounders SharesForm 144
10 November 2025Hallen EdOfficer, Director59,492$1.8 million10 November 202559,492 shares from 10 November 2025Fidelity Brokerage Services LLCFounder SharesForm 144
A Form 144 is the notice an insider files with the SEC before selling restricted or control shares over the Rule 144 thresholds; it says what may be sold, not what was.
Read moreValue is the filer's own aggregate market value. Sold, per Form 4: the same seller's open-market sales on Form 4 from the notice's date to 90 days after, added up, as they appear on the insiders page; a holder who files no Form 4, such as some large holders, never shows one. What is a Form 144?