KLAVIYO INC KVYO
COM SER A · Common Stock · CUSIP 49845K101
B2C CRM and marketing automation platform
- SectorTechnology
- IndustryServices-Prepackaged Software
- HeadquartersBoston, MA
- Founded2012
- Websiteklaviyo.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($135.9k this quarter). Holder counts are more reliable. Implied quarter-end price ≈ $32.47. Options: 13 managers hold calls ($52.8m notional), 11 hold puts ($30.5m).
Trends to Q4 2025
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2023 | 98 |
| Q4 2023 | 103 |
| Q1 2024 | 133 |
| Q2 2024 | 133 |
| Q3 2024 | 157 |
| Q4 2024 | 185 |
| Q1 2025 | 220 |
| Q2 2025 | 256 |
| Q3 2025 | 277 |
| Q4 2025 | 262 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q1 2024 | 105 | 41 |
| Q2 2024 | 73 | 62 |
| Q3 2024 | 87 | 69 |
| Q4 2024 | 110 | 73 |
| Q1 2025 | 150 | 81 |
| Q2 2025 | 177 | 89 |
| Q3 2025 | 166 | 118 |
| Q4 2025 | 144 | 150 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q1 2025 | $74.5m | $50.5m | 0.68 |
| Q2 2025 | $91.8m | $42.3m | 0.46 |
| Q3 2025 | $62.2m | $36.0m | 0.58 |
| Q4 2025 | $52.8m | $30.5m | 0.58 |
Biggest buyers
| Capital International Investors | New | +12.8m |
| FULLER & THALER ASSET MANAGEMENT, INC. | New | +5.7m |
| MORGAN STANLEY | Added | +3.9m |
| VANGUARD GROUP INC | Added | +1.6m |
| Ancora Advisors LLC | New | +1.3m |
| Capital World Investors | New | +1.1m |
| Fiera Capital Corp | Added | +1.1m |
| AMERICAN CENTURY COMPANIES INC | Added | +776.3k |
| Shannon River Fund Management LLC | New | +729.7k |
| Bienville Capital Management, LLC | Added | +690.0k |
Biggest sellers
| Point72 Asset Management, L.P. | Reduced | -4.4m |
| CITADEL ADVISORS LLC | Reduced | -2.7m |
| Bank of New York Mellon Corp | Reduced | -1.1m |
| COOPER CREEK PARTNERS MANAGEMENT LLC | Sold out | -1.0m |
| Freestone Grove Partners LP | Reduced | -902.2k |
| ROYAL BANK OF CANADA | Reduced | -827.6k |
| Qube Research & Technologies Ltd | Sold out | -641.4k |
| ARROWSTREET CAPITAL, LIMITED PARTNERSHIP | Sold out | -623.7k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Reduced | -588.6k |
| JANUS HENDERSON GROUP PLC | Reduced | -567.9k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $20.6m634.3k shares |
| CITADEL ADVISORS LLC | Added | $9.3m287.1k shares |
| MILLENNIUM MANAGEMENT LLC | Added | $7.3m225.0k shares |
| JANE STREET GROUP, LLC | Reduced | $3.8m118.4k shares |
| SIMPLEX TRADING, LLC | Reduced | $3.2m97.9k shares |
| IMC-Chicago, LLC | Added | $2.3m71.4k shares |
| Verition Fund Management LLC | New | $1.6m50.0k shares |
| GROUP ONE TRADING LLC | Added | $1.5m45.6k shares |
| Walleye Trading LLC | Added | $1.2m38.3k shares |
| D. E. Shaw & Co., Inc. | New | $1.0m30.8k shares |
Biggest puts
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Added | $7.1m219.4k shares |
| GOLDMAN SACHS GROUP INC | Added | $6.3m192.5k shares |
| Twin Tree Management, LP | Reduced | $5.2m161.2k shares |
| CITADEL ADVISORS LLC | Reduced | $4.5m137.9k shares |
| GROUP ONE TRADING LLC | Added | $2.9m87.9k shares |
| IMC-Chicago, LLC | Added | $1.9m57.9k shares |
| Walleye Capital LLC | Added | $1.3m38.5k shares |
| SIMPLEX TRADING, LLC | Reduced | $529.3k16.3k shares |
| Walleye Trading LLC | Reduced | $402.6k12.4k shares |
| JANE STREET GROUP, LLC | Reduced | $269.5k8.3k shares |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Bialecki Andrew 13G · exempt (held before listing) +1.4 pts · filed 2026-08-05 | 36.5% |
| SHOPIFY INC. 13D · may seek influence +2.0 pts · filed 2026-08-31 | 20.8% |
| Hallen Ed 13G · exempt (held before listing) filed 2025-11-05 | 19.4% |
| SUMMIT PARTNERS L P 13G · exempt (held before listing) -8.8 pts · filed 2025-11-13 | 12.0% |
| Accomplice Fund I, L.P. 13G · exempt (held before listing) filed 2025-05-07 | 10.5% |
| Capital International Investors 13G · institution -1.3 pts · filed 2026-05-14 | 8.0% |
| BlackRock, Inc. 13G · institution new · filed 2026-07-29 | 5.3% |
| VANGUARD PORTFOLIO MANAGEMENT LLC 13G · institution new · filed 2026-04-29 | 5.2% |
| VANGUARD CAPITAL MANAGEMENT LLC 13G · institution new · filed 2026-07-31 | 5.0% |
Fell to 5% or below in the last year: FMR LLC (4.7%, 2026-08-06), VANGUARD GROUP INC (0.0%, 2026-03-27; now reported by VANGUARD PORTFOLIO MANAGEMENT LLC), MORGAN STANLEY (4.1%, 2026-03-06)
Insider purchases and sales in Q4 2025
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q1 2024 | 0 | — | 1 | $865.7k | — |
| Q2 2024 | 0 | — | 3 | $1.4m | $1.4m |
| Q3 2024 | 0 | — | 4 | $12.9m | $12.9m |
| Q4 2024 | 0 | — | 3 | $4.9m | $4.9m |
| Q1 2025 | 0 | — | 4 | $5.6m | $5.6m |
| Q2 2025 | 0 | — | 5 | $364.0m | $3.1m |
| Q3 2025 | 0 | — | 7 | $45.6m | $45.6m |
| Q4 2025 | 0 | — | 6 | $50.0m | $50.0m |
| Date | Insider | Trade | Value |
|---|---|---|---|
| 2025-12-22 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $3.3m100.0k shares |
| 2025-12-18 | Edmond Landon Chief Legal Officer | Sold plan | $445.3k14.2k shares |
| 2025-12-18 | Whalen Amanda Chief Financial Officer | Sold plan | $439.4k14.0k shares |
| 2025-12-17 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $3.0m100.0k shares |
| 2025-12-17 | Hallen Ed Director · By Hodgkins LLC | Sold plan | $2.5m82.7k shares |
| 2025-12-17 | Hallen Ed Director · By Hodgkins Trust | Sold plan | $1.1m34.9k shares |
| 2025-12-16 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.0m138.6k shares |
| 2025-12-15 | Rowland Stephen Eric President | Sold plan | $209.2k7.1k shares |
| 2025-12-15 | Hallen Ed Director · By Hodgkins LLC | Sold plan | $18.1k600 shares |
| 2025-12-15 | Hallen Ed Director · By Hodgkins Trust | Sold plan | $4.7k157 shares |
| 2025-12-11 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $533.3k17.8k shares |
| 2025-12-10 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $2.5m82.2k shares |
| 2025-12-09 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $3.9m131.4k shares |
| 2025-12-04 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $28.6k952 shares |
| 2025-12-02 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.1m142.0k shares |
| 2025-11-24 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.0m144.7k shares |
| 2025-11-20 | Edmond Landon Chief Legal Officer | Sold plan | $397.1k14.4k shares |
| 2025-11-18 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.0m147.3k shares |
| 2025-11-17 | Galvin Carmel Chief People Officer | Sold plan | $306.9k11.2k shares |
| 2025-11-17 | Rowland Stephen Eric President | Sold plan | $194.6k7.1k shares |
| 2025-11-14 | Whalen Amanda Chief Financial Officer | Sold plan | $428.9k15.0k shares |
| 2025-11-11 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.2m140.5k shares |
| 2025-11-11 | Hallen Ed Director · By Hodgkins LLC | Sold plan | $68.0k2.3k shares |
| 2025-11-11 | Hallen Ed Director · By Hodgkins Trust | Sold plan | $16.4k545 shares |
| 2025-11-10 | Hallen Ed Director · By Hodgkins LLC | Sold plan | $1.5m50.9k shares |
| 2025-11-10 | Hallen Ed Director · By Hodgkins Trust | Sold plan | $257.6k8.6k shares |
| 2025-10-15 | Rowland Stephen Eric President | Sold plan | $173.0k7.1k shares |
| 2025-10-14 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.0m163.3k shares |
| 2025-10-10 | Whalen Amanda Chief Financial Officer | Sold plan | $375.4k15.0k shares |
| 2025-10-07 | Bialecki Andrew Chief Executive Officer, director | Sold plan | $4.0m159.5k shares |
Their holding: how much the trade added to or took from the insider's holding (direct, or the trust or fund named). The same trade is sometimes reported by more than one insider, such as a fund and the director who represents it; totals count it once. A value is left blank where the reported price is far from the market price (usually a typo).
Holders, Q4 2025
| Manager | Shares | Change |
|---|---|---|
| SUMMIT PARTNERS L P 58.24% of their portfolio | 18.9m $612.1m | Unchanged |
| MORGAN STANLEY 0.03% of their portfolio | 14.5m $472.3m | Added +3.9m |
| VANGUARD GROUP INC 0.01% of their portfolio | 14.4m $466.3m | Added +1.6m |
| Capital International Investors 0.07% of their portfolio | 12.8m $415.3m | New |
| FMR LLC 0.01% of their portfolio | 8.4m $271.8m | Added +131.7k |
| FULLER & THALER ASSET MANAGEMENT, INC. 0.32% of their portfolio | 5.7m $185.3m | New |
| ALLIANCEBERNSTEIN L.P. 0.05% of their portfolio | 4.7m $153.6m | Reduced -75.4k |
| BlackRock, Inc. 0.00% of their portfolio | 3.7m $120.7m | Added +59.4k |
| Sands Capital Alternatives, LLC 22.86% of their portfolio | 3.6m $118.5m | Added +134.6k |
| JPMORGAN CHASE & CO 0.01% of their portfolio | 3.6m $115.7m | Reduced -250.9k |
| Whale Rock Capital Management LLC 1.27% of their portfolio | 3.1m $99.3m | Added +922 |
| FEDERATED HERMES, INC. 0.16% of their portfolio | 2.9m $94.2m | Reduced -9.4k |
| AMERICAN CENTURY COMPANIES INC 0.05% of their portfolio | 2.9m $94.0m | Added +776.3k |
| Capital Research Global Investors 0.02% of their portfolio | 2.6m $83.7m | Reduced -15.4k |
| Fiera Capital Corp 0.24% of their portfolio | 2.3m $75.7m | Added +1.1m |
| GREENOAKS LLC 2.52% of their portfolio | 2.3m $75.2m | Unchanged |
| TWO SIGMA INVESTMENTS, LP 0.11% of their portfolio | 2.2m $72.2m | Added +531.8k |
| FRANKLIN RESOURCES INC 0.02% of their portfolio | 2.0m $64.3m | Added +57.9k |
| 12 West Capital Management LP 7.11% of their portfolio | 1.8m $59.7m | Unchanged |
| TWO SIGMA ADVISERS, LP 0.11% of their portfolio | 1.8m $57.9m | Added +226.2k |
| RENAISSANCE TECHNOLOGIES LLC 0.09% of their portfolio | 1.8m $57.3m | Added +80.4k |
| MILLENNIUM MANAGEMENT LLC 0.04% of their portfolio | 1.7m $55.2m | Reduced -80.6k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 1.7m $54.3m | Added +195.3k |
| Clearbridge Investments, LLC 0.04% of their portfolio | 1.6m $53.3m | Reduced -339.6k |
| GOLDMAN SACHS GROUP INC 0.01% of their portfolio | 1.5m $49.5m | Reduced -68.0k |
| NORGES BANK 0.01% of their portfolio | 1.5m $49.3m | Not comparable |
| Bank of New York Mellon Corp 0.01% of their portfolio | 1.4m $45.0m | Reduced -1.1m |
| Ancora Advisors LLC 0.89% of their portfolio | 1.3m $43.2m | New |
| VOYA INVESTMENT MANAGEMENT LLC 0.04% of their portfolio | 1.3m $40.9m | Reduced -160.1k |
| Capital World Investors 0.01% of their portfolio | 1.1m $37.3m | New |
| STATE STREET CORP 0.00% of their portfolio | 1.1m $34.1m | Added +234.3k |
| Bienville Capital Management, LLC 5.00% of their portfolio | 969.3k $31.5m | Added +690.0k |
| SANDS CAPITAL MANAGEMENT, LLC 0.09% of their portfolio | 928.8k $30.2m | Reduced -176.8k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 893.2k $29.0m | Added +303.5k |
| JANUS HENDERSON GROUP PLC 0.01% of their portfolio | 886.8k $28.8m | Reduced -567.9k |
| Point72 Asset Management, L.P. 0.04% of their portfolio | 876.9k $28.5m | Reduced -4.4m |
| ArrowMark Colorado Holdings LLC 0.58% of their portfolio | 815.6k $26.5m | Reduced -84.9k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 809.4k $26.3m | Added +79.5k |
| FIRST TRUST ADVISORS LP 0.02% of their portfolio | 806.9k $26.2m | Reduced -119.4k |
| Delta Global Management LP 1.86% of their portfolio | 785.3k $25.5m | Added +270.9k |
| Shannon River Fund Management LLC 3.72% of their portfolio | 729.7k $23.7m | New |
| Schonfeld Strategic Advisors LLC 0.11% of their portfolio | 701.3k $22.8m | Reduced -211.9k |
| Walleye Capital LLC 0.13% of their portfolio | 677.6k $22.0m | Added +661.3k |
| Barton Investment Management 2.34% of their portfolio | 670.0k $21.8m | Added +275.1k |
| J. Goldman & Co LP 0.80% of their portfolio | 634.4k $20.6m | Added +221.4k |
| Islander Capital Partners, L.P. 9.10% of their portfolio | 621.7k $20.2m | First filing |
| BNP PARIBAS ASSET MANAGEMENT Holding S.A. 0.02% of their portfolio | 613.0k $19.9m | Added +612.0k |
| Granahan Investment Management, LLC 0.84% of their portfolio | 605.3k $19.7m | Added +294.4k |
| Nearwater Capital Markets, Ltd 0.33% of their portfolio | 600.0k $19.5m | New |
| CANADA PENSION PLAN INVESTMENT BOARD 0.01% of their portfolio | 590.7k $19.2m | Added +135.2k |
| Engineers Gate Manager LP 0.22% of their portfolio | 570.0k $18.5m | Added +167.0k |
| Alyeska Investment Group, L.P. 0.05% of their portfolio | 552.9k $18.0m | New |
| Quantinno Capital Management LP 0.04% of their portfolio | 549.1k $17.8m | Added +48.1k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 513.6k $16.7m | Added +3.9k |
| UBS Group AG 0.00% of their portfolio | 468.6k $15.2m | Added +49.3k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.03% of their portfolio | 461.9k $15.0m | Reduced -588.6k |
| NEW YORK STATE COMMON RETIREMENT FUND 0.02% of their portfolio | 458.1k $14.9m | Added +109.0k |
| GLYNN CAPITAL MANAGEMENT LLC 5.09% of their portfolio | 456.8k $14.8m | Reduced -476 |
| Jefferies Financial Group Inc. 0.12% of their portfolio | 455.0k $14.8m | Added +436.2k |
| NEUBERGER BERMAN GROUP LLC 0.01% of their portfolio | 445.5k $14.5m | New |
| Morangie Management LLC 10.95% of their portfolio | 423.1k $13.7m | Reduced -46.7k |
| GOODNOW INVESTMENT GROUP, LLC 1.13% of their portfolio | 374.5k $12.2m | Reduced -9.8k |
| TWIN FOCUS CAPITAL PARTNERS, LLC 1.36% of their portfolio | 364.7k $11.8m | Reduced -48.2k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 348.3k $11.3m | Added +64.7k |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 345.0k $11.2m | Reduced -183.5k |
| Jump Financial, LLC 0.13% of their portfolio | 317.4k $10.3m | Added +81.5k |
| CITADEL ADVISORS LLC 0.01% of their portfolio | 315.8k $10.3m | Reduced -2.7m |
| Burkehill Global Management, LP 0.64% of their portfolio | 300.0k $9.7m | Unchanged |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 286.8k $9.3m | Added +152.0k |
| Swiss National Bank 0.00% of their portfolio | 252.7k $8.2m | Added +54.0k |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 242.4k $7.9m | Reduced -61.0k |
| CAPITAL FUND MANAGEMENT S.A. 0.07% of their portfolio | 232.9k $7.6m | Added +6.3k |
| VICTORY CAPITAL MANAGEMENT INC 0.00% of their portfolio | 229.0k $7.4m | Reduced -205.0k |
| Trexquant Investment LP 0.07% of their portfolio | 228.5k $7.4m | Reduced -225.9k |
| Balyasny Asset Management L.P. 0.01% of their portfolio | 227.7k $7.4m | Reduced -348.9k |
| 1832 Asset Management L.P. 0.01% of their portfolio | 226.8k $7.4m | New |
| Mayflower Financial Advisors, LLC 0.89% of their portfolio | 226.7k $7.4m | Reduced -6.5k |
| UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio | 225.4k $7.3m | Added +42.8k |
| Freestone Grove Partners LP 0.05% of their portfolio | 209.2k $6.8m | Reduced -902.2k |
| Liontrust Investment Partners LLP 0.09% of their portfolio | 193.6k $6.3m | Added +91.8k |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 183.1k $5.9m | Added +54.1k |
| Lisanti Capital Growth, LLC 1.37% of their portfolio | 178.1k $5.8m | New |
| Cinctive Capital Management LP 0.33% of their portfolio | 174.8k $5.7m | Reduced -110.7k |
| HUNTINGTON NATIONAL BANK 0.03% of their portfolio | 166.5k $5.4m | Added +89.8k |
| Pathstone Holdings, LLC 0.02% of their portfolio | 159.5k $5.2m | Reduced -14.5k |
| LMR Partners LLP 0.05% of their portfolio | 150.0k $4.9m | Added +50.0k |
| Cynosure Group, LLC 0.47% of their portfolio | 141.9k $4.6m | Reduced -141.9k |
| Night Squared LP 1.25% of their portfolio | 136.2k $4.4m | Reduced -31.1k |
| Focus Partners Wealth 0.00% of their portfolio | 134.6k $4.4m | Added +384 |
| OSSIAM 0.09% of their portfolio | 133.9k $4.3m | Unchanged |
| IEQ CAPITAL, LLC 0.01% of their portfolio | 132.8k $4.3m | Reduced -54.5k |
| Crestwood Advisors Group, LLC 0.07% of their portfolio | 128.9k $4.2m | Added +3 |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 126.1k $4.1m | Added +9.4k |
| SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.14% of their portfolio | 125.2k $4.1m | New |
| Susquehanna Portfolio Strategies, LLC 0.06% of their portfolio | 124.2k $4.0m | Reduced -264.9k |
| Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio | 120.6k $3.9m | New |
| Legal & General Group Plc 0.00% of their portfolio | 118.2k $3.8m | Added +15.7k |
| CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio | 113.8k $3.7m | Added +23.9k |
| FIL Ltd 0.00% of their portfolio | 109.9k $3.6m | New |
| ENVESTNET ASSET MANAGEMENT INC 0.00% of their portfolio | 109.6k $3.6m | Added +7.4k |