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Livermore
Livermore
ZHEN

Klaviyo, Inc.

KVYO
Exchange
NYSE
Industry
Services-Prepackaged Software
SEC CIK
0001835830

In the last 90 days, Klaviyo, Inc. insiders filed 0 open-market purchases and 7 sales; 277 institutions reported holding it in 13F filings for Q2 2026, worth $2.19B in total; no superinvestor holds it.

Holders of 5% or more of KVYO

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Klaviyo, Inc., largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of KVYO
HolderLatest formStakeChangeFirst filedLatest filingFiling
Bialecki Andrew13G/A36.50%75.3M shares+1.40 ppfrom 35.10%Feb 13, 20245 filingsAug 5, 2026SEC
Shopify Inc.13D/A20.83%33.4M shares+1.98 ppfrom 18.85%Dec 11, 20234 filingsAug 31, 2026SEC
Hallen Ed13G/A19.40%32.9M shares–Feb 13, 20242 filingsNov 5, 2025SEC
Summit Partners L P13G/A12.03%18.9M shares−8.84 ppfrom 20.87%Jan 31, 20245 filingsNov 13, 2025SEC
Accomplice Fund I, L.P.13G/A10.50%11.1M shares–Feb 1, 20242 filingsMay 7, 2025SEC
Capital International Investors13G/A8.00%11.7M shares−1.30 ppfrom 9.30%Feb 13, 20262 filingsMay 14, 2026SEC
BlackRock, Inc.13G5.30%7.46M sharesNewJul 29, 20261 filingJul 29, 2026SEC
Vanguard Portfolio Management LLC13G5.17%7.53M sharesNewApr 29, 20261 filingApr 29, 2026SEC
Vanguard Capital Management LLC13G5.00%7.05M sharesNewJul 31, 20261 filingJul 31, 2026SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

46 Schedule 13D and 13G filings on Klaviyo, Inc., newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on KVYO
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 31, 20265:40 PM ETShopify Inc.and 1 other13D/A20.83%33.4M shares+1.98 ppfrom 18.85%Aug 5, 2026SEC
Aug 6, 202610:31 AM ETFMR LLCand 1 other13G/A4.70%6.57M shares−2.00 ppfrom 6.70%Below 5%Jun 30, 2026SEC
Aug 5, 20266:45 PM ETBialecki Andrew13G/A36.50%75.3M shares+1.40 ppfrom 35.10%Jun 30, 2026SEC
Jul 31, 202610:43 AM ETVanguard Capital Management LLC13G5.00%7.05M sharesNewJun 30, 2026SEC
Jul 29, 20263:19 PM ETBlackRock, Inc.13G5.30%7.46M sharesNewJun 30, 2026SEC
May 14, 202612:52 PM ETCapital International Investors13G/A8.00%11.7M shares−1.30 ppfrom 9.30%Mar 31, 2026SEC
Apr 29, 20262:17 PM ETVanguard Portfolio Management LLC13G5.17%7.53M sharesNewMar 31, 2026SEC
Mar 27, 202610:17 AM ETVanguard Group Inc13G/A0.00%0 shares−10.15 ppfrom 10.15%Below 5%Mar 13, 2026SEC
Mar 6, 20264:15 PM ETMorgan Stanley13G/A4.10%5.99M shares−6.40 ppfrom 10.50%Below 5%Feb 28, 2026SEC
Feb 13, 20264:30 PM ETCapital International Investors13G9.30%12.8M sharesNewDec 31, 2025SEC
Feb 10, 20265:08 PM ETBialecki Andrew13G/A35.10%78.2M shares−2.60 ppfrom 37.70%Dec 31, 2025SEC
Jan 8, 20264:22 PM ETMorgan Stanley13G/A10.50%14.5M shares+2.10 ppfrom 8.40%Dec 31, 2025SEC
Nov 14, 20255:02 PM ETShopify Inc.and 1 other13D/A18.85%32.0M shares−6.66 ppfrom 25.51%Aug 29, 2025SEC
Nov 13, 20254:05 PM ETSummit Partners L Pand 5 others13G/A12.03%18.9M shares−8.84 ppfrom 20.87%Sep 30, 2025SEC
Nov 7, 202512:04 PM ETMorgan Stanley13G8.40%10.3M sharesNewSep 30, 2025SEC
Nov 5, 20254:19 PM ETHallen Ed13G/A19.40%32.9M shares–Sep 30, 2025SEC
Nov 5, 20254:17 PM ETBialecki Andrew13G/A37.70%83.1M shares−5.20 ppfrom 42.90%Sep 30, 2025SEC
Nov 5, 202511:40 AM ETFMR LLCand 1 other13G6.70%8.24M sharesNewSep 30, 2025SEC
Aug 8, 20254:33 PM ETSummit Partners L Pand 5 others13G/A20.87%30.8M shares−9.15 ppfrom 30.02%Jun 30, 2025SEC
Aug 5, 20254:24 PM ETBialecki Andrew13G/A42.90%87.8M shares–Jun 30, 2025SEC
Jul 7, 20251:20 PM ETVanguard Group Inc13G/A10.15%10.7M shares–Jun 30, 2025SEC
May 14, 20255:36 PM ETSands Capital Ventures, LLCand 5 others13G/A4.90%4.42M shares–Below 5%Mar 31, 2025SEC
May 14, 20255:10 PM ETAlliancebernstein L.P.13G/A4.40%4.02M shares−0.70 ppfrom 5.10%Below 5%Mar 31, 2025SEC
May 13, 20254:22 PM ETAccel Growth Fund V L.P.and 8 others13G/A4.90%4.66M shares−0.70 ppfrom 5.60%Below 5%Mar 31, 2025SEC
May 7, 20254:31 PM ETSummit Partners L Pand 5 others13G/A30.02%38.8M shares−4.11 ppfrom 34.13%Mar 31, 2025SEC
May 7, 20254:05 PM ETAccomplice Fund I, L.P.and 2 others13G/A10.50%11.1M shares–Mar 31, 2025SEC
Feb 21, 20255:08 PM ETShopify Inc.and 1 other13D/A25.51%31.0M shares–Nov 9, 2024SEC
Feb 14, 20256:10 AM ETAccel Growth Fund V L.P.and 8 others13G/A5.60%4.62M shares–Dec 31, 2024SEC
Feb 13, 20252:14 PM ETCapital Research Global Investors13G/A3.80%3.00M shares–Below 5%Dec 31, 2024SEC
Feb 7, 20257:49 PM ETSummit Partners L Pand 5 others13G/A34.13%40.8M shares–Dec 31, 2024SEC
Feb 5, 20254:31 PM ETAlliancebernstein L.P.13G/A5.10%4.00M shares−1.40 ppfrom 6.50%Dec 31, 2024SEC
Nov 15, 20241:44 PM ETAlliancebernstein L.P.13G/A6.50%4.68M shares–Sep 30, 2024SEC
Nov 14, 2024Sands Capital Ventures, LLC13G/AOld format–––SEC
Nov 14, 2024Accel Growth Fund V L.P.13G/AOld format–––SEC
Nov 14, 2024Lone Pine Capital LLCSuperinvestorLone Pine Capital13G/AOld format–––SEC
Nov 12, 2024Capital Research Global Investors13GOld format–New–SEC
Nov 12, 2024Vanguard Group Inc13G/AOld format–––SEC
Nov 8, 2024Summit Partners L P13G/AOld format–––SEC
Nov 4, 2024Vanguard Group Inc13G/AOld format–––SEC
Nov 4, 2024Vanguard Group Inc13G/AOld format–––SEC
Oct 31, 20245:17 PM ETClearbridge Investments, LLC13G/A3.00%2.15M shares–Below 5%Sep 30, 2024SEC
Jul 30, 2024Shopify Inc.13D/AOld format–––SEC
Mar 7, 202412:29 PM ETBlackRock Inc.13GOld format–––SEC
Feb 14, 2024Alliancebernstein L.P.13GOld format–New–SEC
Feb 13, 2024Hallen Ed13GOld format–New–SEC
Feb 13, 2024Bialecki Andrew13GOld format–New–SEC
Feb 13, 2024Vanguard Group Inc13GOld format–New–SEC
Feb 13, 2024Sands Capital Ventures, LLC13GOld format–New–SEC
Feb 12, 2024Accel Growth Fund V L.P.13GOld format–New–SEC
Feb 9, 2024Clearbridge Investments, LLC13GOld format–New–SEC

Form 144: proposed insider sales

1 notice from officers, directors and other affiliates planning to sell Klaviyo, Inc. shares, newest first.

Form 144 notices for KVYO
Filed (ET)SellerShares to sellMarket valuePlanned saleBrokerFiling
Sep 24, 20264:12 PM ETHallen EdOfficer · Director1.30K$22.1KSep 24, 202610b5-1Fidelity Brokerage Services LLCSEC