As of November 7, 2026, 9 holders' latest Schedule 13D or 13G filings report owning 5% or more of Klaviyo Inc. The largest reported stake is Bialecki Andrew's, at 36.5%. 22 filings are on record since July 7, 2025 (Schedule 13G/A, August 5, 2026).
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Key facts
- · Reporting person: Fmr LLC · Sole voting: 6,625,852 · Shared voting: 0 · Sole dispositive: 6,730,469 · Shared dispositive: 0 · SCHEDULE 13G, 2026-11-05
- · Reporting person: Shopify Strategic Holdings 3 LLC · Sole voting: 0 · Shared voting: 33,405,047 · Sole dispositive: 0 · Shared dispositive: 33,405,047 · SCHEDULE 13D/A, 2026-08-31
- · Holder: Fmr LLC · Percent: 4.7% · SCHEDULE 13G/A
- · Reporting person: Bialecki Andrew · Sole voting: 75,326,229 · Shared voting: 0 · Sole dispositive: 75,326,229 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-08-05
- · Reporting person: Vanguard Capital Management · Sole voting: 1,060,848 · Shared voting: 0 · Sole dispositive: 7,051,508 · Shared dispositive: 0 · SCHEDULE 13G, 2026-07-31
Klaviyo Inc has 22 Schedule 13D or 13G filings on record since 2025-07-07. 9 holders' latest filing reports 5% or more of class a common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 36.5% | 75,326,229 | SCHEDULE 13G/A, 2026-08-05 | 2026-06-30 | |
| Shopify Inc. | 20.83% | 33,405,047 | SCHEDULE 13D/A, 2026-08-31 | 2026-08-05 |
| 19.4% | 32,879,098 | SCHEDULE 13G/A, 2025-11-05 | 2025-09-30 | |
| Summit Partners, L.P. | 12.03% | 18,852,778 | SCHEDULE 13G/A, 2025-11-13 | 2025-09-30 |
| Capital International Investors | 8% | 11,703,859 | SCHEDULE 13G/A, 2026-05-14 | 2026-03-31 |
| Fmr LLC | 5.3% | 6,730,469 | SCHEDULE 13G, 2026-11-05 | 2026-09-30 |
| BlackRock, Inc. | 5.3% | 7,462,388 | SCHEDULE 13G, 2026-07-29 | 2026-06-30 |
| Vanguard Portfolio Management | 5.17% | 7,531,915 | SCHEDULE 13G, 2026-04-29 | 2026-03-31 |
| Vanguard Capital Management | 5% | 7,051,508 | SCHEDULE 13G, 2026-07-31 | 2026-06-30 |
| 4.1% | 5,988,235 | SCHEDULE 13G/A, 2026-03-06 | 2026-02-28 | |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-27 | 2026-03-13 |
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Keep reading
More on Klaviyo Inc and the records around it.
Klaviyo Inc elsewhere on the record
- Leadership changes Jul 2026
- Who owns it
Companies that share a holder
- Summit Partners Growth Equity Fund IX-A, L.P. also filed stake reports on 1 other company: LifeStance Health Group, Inc (Aug 2026)
- Capital International Investors also filed stake reports on 96 other companies: Aurora Innovation, Inc. (Nov 2026), Arxis, Inc. (Aug 2026), Astronics Corp. (Aug 2026)
- Morgan Stanley also filed stake reports on 182 other companies: MDA Space Ltd. (Nov 2026), RiverNorth/DoubleLine Strategic Opportunity Fund, Inc. (Oct 2026), Arbutus Biopharma Corp (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Bialecki Andrew | 75,326,229 | 0 | 75,326,229 | 0 | SCHEDULE 13G/A, 2026-08-05 |
| Shopify Strategic Holdings 3 LLC | 0 | 33,405,047 | 0 | 33,405,047 | SCHEDULE 13D/A, 2026-08-31 |
| Shopify Inc. | 0 | 33,405,047 | 0 | 33,405,047 | SCHEDULE 13D/A, 2026-08-31 |
| Fmr LLC | 6,625,852 | 0 | 6,730,469 | 0 | SCHEDULE 13G, 2026-11-05 |
| Abigail P. Johnson | 0 | 0 | 6,730,469 | 0 | SCHEDULE 13G, 2026-11-05 |
| BlackRock, Inc. | 7,237,852 | 0 | 7,462,388 | 0 | SCHEDULE 13G, 2026-07-29 |
| Vanguard Capital Management | 1,060,848 | 0 | 7,051,508 | 0 | SCHEDULE 13G, 2026-07-31 |
The latest filing identifies Klaviyo Inc by CUSIP 49845K101 and gives its principal executive office as 125 SUMMER STREET, FLOOR 6, BOSTON, MA 02110 (SCHEDULE 13G, 2026-11-05).
Source of funds (Item 3)
Item 3 of the Schedule 13D is hereby amended by adding the text below to the end of Item 3 of the Schedule 13D: On January 28, April 28, and July 28 2026, 344,383, 344,381 and 344,383 of the Warrants held by SSH 3, respectively, vested and became exercisable for an equal number of shares of Series B Common Stock. SSH 3 exercised these Warrants on January 29, April 28 and August 31, 2026, respectively. Additionally, 344,382 of the Warrants held by SSH 3 will vest and become exercisable for 344,382 shares of Series B Common Stock on October 28, 2026.Shopify Inc., SCHEDULE 13D/A, 2026-08-31
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-07 | The Vanguard Group | 10.15% | SCHEDULE 13G/A |
| 2025-08-05 | Bialecki Andrew | 42.9% | SCHEDULE 13G/A |
| 2025-08-08 | Summit Partners, L.P. | 20.87% | SCHEDULE 13G/A |
| 2025-11-05 | Fmr LLC | 6.7% | SCHEDULE 13G |
| 2025-11-05 | Bialecki Andrew | 37.7% | SCHEDULE 13G/A |
| 2025-11-05 | Hallen Ed | 19.4% | SCHEDULE 13G/A |
| 2025-11-07 | Morgan Stanley | 8.4% | SCHEDULE 13G |
| 2025-11-13 | Summit Partners, L.P. | 12.03% | SCHEDULE 13G/A |
| 2025-11-14 | Shopify Inc. | 18.85% | SCHEDULE 13D/A |
| 2026-01-08 | Morgan Stanley | 10.5% | SCHEDULE 13G/A |
| 2026-02-10 | Bialecki Andrew | 35.1% | SCHEDULE 13G/A |
| 2026-02-13 | Capital International Investors | 9.3% | SCHEDULE 13G |
| 2026-03-06 | Morgan Stanley | 4.1% | SCHEDULE 13G/A |
| 2026-03-27 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.17% | SCHEDULE 13G |
| 2026-05-14 | Capital International Investors | 8% | SCHEDULE 13G/A |
| 2026-07-29 | BlackRock, Inc. | 5.3% | SCHEDULE 13G |
| 2026-07-31 | Vanguard Capital Management | 5% | SCHEDULE 13G |
| 2026-08-05 | Bialecki Andrew | 36.5% | SCHEDULE 13G/A |
| 2026-08-06 | Fmr LLC | 4.7% | SCHEDULE 13G/A |
| 2026-08-31 | Shopify Inc. | 20.83% | SCHEDULE 13D/A |
| 2026-11-05 | Fmr LLC | 5.3% | SCHEDULE 13G |
Questions about who owns Klaviyo Inc
Who owns Klaviyo Inc?
On this page, 9 holders' latest ownership filings report 5% or more of Klaviyo Inc: Bialecki Andrew (36.5%, Schedule 13G/A, filed 2026-08-05), Shopify Inc. (20.83%, Schedule 13D/A, filed 2026-08-31), Hallen Ed (19.4%, Schedule 13G/A, filed 2025-11-05), Summit Partners, L.P. (12.03%, Schedule 13G/A, filed 2025-11-13) and Capital International Investors (8%, Schedule 13G/A, filed 2026-05-14); 4 more are listed above.
Who are the largest shareholders of Klaviyo Inc?
By the share each holder's latest filing reports, the largest holders of Klaviyo Inc on this page are Bialecki Andrew (36.5%), Shopify Inc. (20.83%) and Hallen Ed (19.4%).
When did Bialecki Andrew buy into Klaviyo Inc?
The filings give report dates, not purchase dates. The earliest filing from Bialecki Andrew on this page is the Schedule 13G/A, filed 2025-08-05, reporting 42.9%; its latest, Schedule 13G/A filed 2026-08-05, reports 36.5%. That earliest filing is itself an amendment, which updates an earlier report.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 22 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for Klaviyo Inc
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| July 13, 2026 | Leadership change: Erica Smith appointed, Chief Financial Officer, and 1 more | — | Leadership changes | Source |
| May 5, 2026 | Leadership change: Amanda Whalen departs, Chief Financial Officer, and 1 more | — | Leadership changes | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.