Klaviyo, Inc.
A maker of marketing software that helps online stores send personalized email and SMS campaigns, using customer data pulled from platforms like Shopify to trigger automated messages such as cart-abandonment reminders. Founded in 2012 in Boston by Andrew Bialecki and Ed Hallen, the company takes its name from the Spanish word "clavija," a mountaineering piton — a nod to supporting businesses as they "climb the mountain" of growth.
Sold 34.73M
Sold 16.52M
Sold 270.4K
Granted 2.40M
Granted 481.8K · Sold 45.0K
Granted 980.4K · Sold 398.0K
Granted 519.4K · Sold 259.5K
Granted 412.0K · Sold 175.5K
Sold 260.0K
Granted 29.2K · Sold 33.3K
Bought 26.9K
Granted 29.2K
Granted 29.2K · Bought 16.3K · Sold 25.0K
Sold 2.41M
Granted 29.2K · Sold 23.2K
Sold 1.11M
| Insider | Stake change | Holds now | Granted / vested | Bought | Sold |
|---|---|---|---|---|---|
| Summit Partners L P +5 co-filers10% owner · 48 transactions | — | 177.60M | — | — | 34.73M |
| Bialecki AndrewCo-Chief Executive Officer, Director, 10% owner · 99 transactions | — | 75.33M | — | — | 16.52M |
| Hallen EdDirector, 10% owner · 16 transactions | — | 33.85M | — | — | 270.4K |
| Fernandez Gomez LucianoCo-Chief Executive Officer, Director · 14 transactions | — | 2.32M | 2.40M | — | — |
| Galvin CarmelChief People Officer · 16 transactions | — | 938.0K | 481.8K | — | 45.0K |
| Whalen AmandaChief Financial Officer · 81 transactions | — | 852.2K | 980.4K | — | 398.0K |
| Edmond LandonChief Legal Officer · 56 transactions | — | 561.8K | 519.4K | — | 259.5K |
| Rowland Stephen EricPresident · 52 transactions | — | 434.3K | 412.0K | — | 175.5K |
| Chaves AllenChief Technology Officer · 12 transactions | — | 259.0Kas of Sep 2024 | — | — | 260.0K |
| Weisman TonyDirector · 7 transactions | — | 125.0K | 29.2K | — | 33.3K |
| Fagnan Jeff10% owner · 8 transactions | — | 63.2Kas of Apr 2025 | — | 26.9K | — |
| Oulman RoxanneDirector · 4 transactions | — | 61.8K | 29.2K | — | — |
| Ceran JenniferDirector · 7 transactions | — | 45.5K | 29.2K | 16.3K | 25.0K |
| Fagnan Jeff +3 co-filers10% owner · 2 transactions | — | 26.7Kas of Oct 2023 | — | — | 2.41M |
| St. Ledger SusanDirector · 8 transactions | — | 25.8K | 29.2K | — | 23.2K |
| Karlen Jon +2 co-filers10% owner · 3 transactions | — | 0as of Feb 2024 | — | — | 1.11M |
| Summit Partners L P +2 co-filers10% owner · 2 transactions | — | 0as of Aug 2025 | — | — | — |
Select a row to see that insider’s individual transactions. Sum of the holdings confirmed in the 12 months before this insider's last filing. A Form 4 reports a holding per line — held directly, or through a named trust, partnership or foundation, and in each share class separately — never a person’s total. Lines not restated in that time are left out and shown apart: an active filer restates what they still hold, so a line they did not restate is more often an entity since renamed, whose shares a successor line reports too. An amber marker means some were left out.
Net open-market activity over the last 5 years: -56.22M shares. Grants, option exercises and tax withholding are excluded — they are compensation mechanics, not decisions to buy or sell.