Company · Ownership research

Klaviyo, Inc. KVYO

CIK 0001835830

Form 4 transactions dated Oct 1, 2023 to Oct 15, 2026, as reported to the SEC.

Insider trading Initial holdings Institutional holders

This page lists 30 of 72 rows; the complete set is available through the API.

Insider filings on file run through Sep 25, 2026.

Some filings are submitted jointly by several insiders. The SEC form does not apportion the reported figures between them, so results include every joint filer.

Insider purchases & sales

Purchased: $1.15M
Sold: $1.63B

Oct 1, 2023 – Sep 25, 2026
Available records · partial months are marked ·

202510 of 30 preview events · 72 available in 2025

Date	Insider	Activity	Trade value (USD)	% of prior holding
Dec 22, 2025	Bialecki Andrew Chief Executive Officer · Director · 10% owner	Sale10b5-1 footnote	$3.30M 100,000 shares sold	100.00% sold Direct holding	▾
Dec 18, 2025	Edmond Landon Chief Legal Officer	Sale10b5-1 footnote	$445.30K 14,190 shares sold	3.86% sold Direct holding	▾
Dec 18, 2025	Whalen Amanda Chief Financial Officer	Sale10b5-1 footnote	$439.36K 14,000 shares sold	3.00% sold Direct holding	▾
Dec 17, 2025	Hallen Ed Director · 10% owner	Sale10b5-1 footnote	$1.06M 34,878 shares sold	20.70% sold Trust holding	▾
Dec 17, 2025	Hallen Ed Director · 10% owner	Sale10b5-1 footnote	$2.51M 82,672 shares sold	13.60% sold LLC holding	▾
Dec 17, 2025	Bialecki Andrew Chief Executive Officer · Director · 10% owner	Sale10b5-1 footnote	$3.04M 100,000 shares sold	100.00% sold Direct holding	▾
Dec 16, 2025	Bialecki Andrew Chief Executive Officer · Director · 10% owner	Sale10b5-1 footnote	$4.03M 138,648 shares sold	100.00% sold Direct holding	▾
Dec 15, 2025	Rowland Stephen Eric President	Sale10b5-1 footnote	$209.22K 7,104 shares sold	1.61% sold Direct holding	▾
Dec 15, 2025	Hallen Ed Director · 10% owner	Sale10b5-1 footnote	$4.73K 157 shares sold	0.09% sold Trust holding	▾
Dec 15, 2025	Hallen Ed Director · 10% owner	Sale10b5-1 footnote	$18.09K 600 shares sold	0.10% sold LLC holding	▾

Showing 30 / 72 record groups in 2025. The complete set is available through the API.

Klaviyo, Inc. · KVYO

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The initial HTML of this page carries its exact data as script#research-data (JSON): values, units, scope, preview limits and SEC sources. Read it directly, no script or API key needed; script#research-access says what needs an account. For the year shown, this page lists 30 of 72 purchase / sale groups and 30 of 163 other groups; the totals and the monthly series cover the whole window.

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{"ticker":"KVYO","transaction_code":["P","S"],"transaction_form_type":"4","page_size":20}

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.

Non-cancelled, non-derivative purchase (P) and sale (S) rows dated inside the public window, as reported. Share totals are on today's split-adjusted basis. Includes open-market and private transactions. Data after the latest filing is not asserted complete and is not zero-filled. A grouped event shares filing, transaction date, security, code, direction, ownership bucket and source. Derivative groups also match underlying security, exercise price, exercise/expiration dates and footnote references. Reported rows are retained; P/S price lots can be grouped. Post-transaction balances are never summed.