BetaInsiders sold $109M in the past 12 months.100% was sold under disclosed trading plans. The largest seller, Andrew Bialecki (Co-Chief Executive Officer, Director), sold $92.6M.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
A share of stake is shown for 0 of the 7 officers and directors who sold. 12 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: Andrew Bialecki, Ed Hallen, Amanda Whalen, Stephen Rowland, Landon Edmond, Tony Weisman, Jennifer Ceran, Carmel Galvin, Gomez Fernandez, Susan St Ledger, Roxanne Oulman and Erica Smith (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Ed Hallen Director | 17,885 | n/a | n/a | n/a | Oct 8, 2026 | Oct 9, 2026 |
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Ed Hallen Director | 97,482 | $17.40 | n/a | n/a | Oct 7, 2026 | Oct 9, 2026 |
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Ed Hallen Director | 1,300 | $17.02 | n/a | n/a | Sep 24, 2026 | Sep 25, 2026 |
"% of total stake" is the shares in an event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings are not confirmed, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.
SUMMIT PARTNERS L P sold $88.5M in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.
Yes. Andrew Bialecki sold 4.15M shares ($92.6M) in the past 12 months, all of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 100% of sales by value ran under 10b5-1 trading plans disclosed in the filings. A trading plan schedules sales in advance.
Yes. 1 officer or director reported 1 purchase in the past 12 months (Form 4 code P; rows the filings describe as reinvested dividends, plan purchases, private deals or moves into the person's own trust are not counted).
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| Andrew Bialecki Co-Chief Executive Officer, Director | $92.6M 4.15M shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Ed Hallen Director | $9.2M 378K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Landon Edmond Chief Legal Officer | $3.1M 139K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Amanda Whalen Chief Financial Officer | $2.9M 141K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Stephen Rowland President | $577K 21K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Carmel Galvin Chief People Officer | $307K 11K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| Susan St Ledger Director | $170K 12K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
Outside holder, reported separately: SUMMIT PARTNERS L P (a 10% owner, not part of management). Sold $88.5M (5.00M shares) from Aug 11, 2026 to Aug 11, 2026. Latest filing
Outside holder, reported separately: Shopify Strategic Holdings 3 LLC (a 10% owner, not part of management). No open-market sales reported in the period. Latest filing
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 13, 2025 | Sold | Held Oct 13, 2026 | Still held |
|---|---|---|---|---|
Andrew Bialecki!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Andrew Bialecki are complete. Co-Chief Executive Officer, Director | n/a | −4.15M | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Andrew BialeckiHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Andrew Bialecki are complete; balances and unit counts will be added when the check is finished. −3.42Mgifted (net of own trusts) | ||||
Ed Hallen!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Ed Hallen are complete. Director | n/a | −378K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Ed HallenHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Ed Hallen are complete; balances and unit counts will be added when the check is finished. −76Kgifted (net of own trusts) | ||||
Amanda Whalen!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Amanda Whalen are complete. Chief Financial Officer | n/a | −141K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Amanda WhalenHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Amanda Whalen are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −162Kwithheld by the company for taxes | ||||
Stephen Rowland!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Stephen Rowland are complete. President | n/a | −21K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Stephen RowlandHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Stephen Rowland are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −34Kwithheld by the company for taxes | ||||
Landon Edmond!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Landon Edmond are complete. Chief Legal Officer | n/a | −139K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Landon EdmondHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Landon Edmond are complete; balances and unit counts will be added when the check is finished. −8.4Kgifted (net of own trusts) −93Kwithheld by the company for taxes | ||||
Tony Weisman!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Tony Weisman are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Tony WeismanHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Tony Weisman are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Jennifer Ceran!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jennifer Ceran are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jennifer CeranHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jennifer Ceran are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Carmel Galvin!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Carmel Galvin are complete. Chief People Officer | n/a | −11K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Carmel GalvinHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Carmel Galvin are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −109Kwithheld by the company for taxes | ||||
Gomez Fernandez!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Gomez Fernandez are complete. Co-Chief Executive Officer, Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Gomez FernandezHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Gomez Fernandez are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −120Kwithheld by the company for taxes | ||||
Susan St Ledger!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Susan St Ledger are complete. Director | n/a | −12K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Susan St LedgerHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Susan St Ledger are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Roxanne Oulman!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Roxanne Oulman are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Roxanne OulmanHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Roxanne Oulman are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Erica Smith!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Erica Smith are complete. Chief Financial Officer | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Erica SmithHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Erica Smith are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Holdings and share of stake for Klaviyo, Inc. are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $109M across 4,848,695 shares. Plan status and stated purpose are separate questions, and a sale can have both.
518,379 shares ($10.8M) were withheld by the company for taxes, which isn't a market sale.
1 officer or director bought shares in this period, in 1 trade(Form 4 code P, leaving out rows the filings describe as reinvested dividends, plan purchases, private deals or moves into the person's own trust). Across all their filings on record there is 1 purchase trade.
Gifts the filings describe as charitable. Gifts are not sales and are not included in the sale totals.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| Andrew Bialecki Co-Chief Executive Officer, Director | 4.15M | $92.6M | 100% | 85% | Oct 14, 2025 to May 26, 2026 |
| Ed Hallen Director | 378K | $9.2M | 100% | 8% | Nov 10, 2025 to Oct 7, 2026 |
| Landon Edmond Chief Legal Officer | 139K | $3.1M | 100% | 3% | Nov 20, 2025 to Aug 31, 2026 |
| Amanda Whalen Chief Financial Officer | 141K | $2.9M | 100% | 3% | Nov 14, 2025 to Aug 14, 2026 |
| Stephen Rowland President | 21K | $577K | 100% | 0.5% | Oct 15, 2025 to Dec 15, 2025 |
| Carmel Galvin Chief People Officer | 11K | $307K | 100% | 0.3% | Nov 17, 2025 to Nov 17, 2025 |
| Susan St Ledger Director | 12K | $170K | 100% | 0.2% | May 18, 2026 to Sep 11, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $4.2M | $4.2M | $0 | $0 |
| Nov 2025 | $15.4M | $15.4M | $0 | $0 |
| Dec 2025 | $26.0M | $26.0M | $0 | $0 |
| Jan 2026 | $16.9M | $16.9M | $0 | $0 |
| Feb 2026 | $3.6M | $3.6M | $0 | $0 |
| Mar 2026 | $20.1M | $20.1M | $0 | $0 |
| Apr 2026 | $7.6M | $7.6M | $0 | $0 |
| May 2026 | $9.3M | $9.3M | $0 | $0 |
| Jun 2026 | $185K | $185K | $0 | $0 |
| Jul 2026 | $249K | $249K | $0 | $0 |
| Aug 2026 | $3.5M | $3.5M | $0 | $0 |
| Sep 2026 | $59K | $59K | $0 | $0 |
| Oct 2026 | $1.7M | $1.7M | $0 | $0 |
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Klaviyo, Inc. are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 243 Forms 3, 4 and 5 on record for Klaviyo, Inc. (SEC CIK 1835830), filed from Sep 20, 2023 to Oct 9, 2026; 81 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 13, 2026. Prices are the ones reported in each filing, often weighted averages.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
| Name | Last filed | Last reported balance |
|---|---|---|
| Jeff Fagnan | Apr 10, 2025 | 11,167,774 shares, last reported balance as of Apr 9, 2025 |
| Allen Chaves | Sep 18, 2024 | 178,203 shares, last reported balance as of Sep 17, 2024 |
| Astral Capital ABEH, LLC | Feb 15, 2024 | 5,129,342 shares, last reported balance as of Feb 13, 2024 |
| Accel Growth Fund V L.P. | Sep 20, 2023 | 6,619,435 shares, last reported balance as of Sep 20, 2023 |
| Ping Li | Sep 20, 2023 | 6,619,435 shares, last reported balance as of Sep 20, 2023 |
| Michael Medici | No balance on record |
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