Security key
49845K101
Klaviyo, Inc. - Series A common stock, par value $0.001 per share (the "Series A Common Stock") (KVYO)
CUSIP: 49845K101
Q1 2026 13F Holders as of 31 Mar 2026
- Security type / class
- Equity / Series A common stock, par value $0.001 per share (the "Series A Common Stock")
- Total 13F shares
- 154,261,478
- Total 13F value
- $2,999,812,466
- Share change
- +375,043
- Put/Call ratio
- 54%
- SEC-reported price per share
- $19.46
- Number of holders
- 261
- Value change
- -$129,866,128
- Number of buys
- 166
- Number of sells
- 104
- Shares outstanding
- 206,373,230
Holder snapshot
7 signals
Open additional details 1 more signal available
Security identity
Names, identifiers, and filing context for this profile.
1 source field
Report period
Q1 2026
Institutions
261
Top holders
10
KVYO full security history
Ownership snapshot
Full 13F holder table
Klaviyo, Inc. SEC filings
Klaviyo, Inc. company facts
Broader feeds
Ownership snapshot
Top reported holders of KVYO - Klaviyo, Inc. - Series A common stock, par value $0.001 per share (the "Series A Common Stock") (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Hallen Ed
Disclosed value leader
Hallen Ed
Comparable rows
15/15
Latest evidence
31 Dec 2025
13D/G
3/4/5
13F
Lead comparable stake: 19%
13D/G row: Hallen Ed
Showing 1-6 of 15 holder rows.
Quick read
Hallen Ed leads the comparable SEC ownership view at 19%.
15 of 15 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Hallen Ed's linked filing trail.
Comparable ownership
Top 5
Hallen Ed
19%
SHOPIFY INC.
19%
SUMMIT PARTNERS L P
12%
Accomplice Fund I, L.P.
10%
VANGUARD GROUP INC
10%
Ownership % is shown only when SEC disclosures are safely comparable across share classes.
Detailed SEC evidence table Showing 1-6 of 15 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Hallen Ed |
13D/G
3/4/5
Director, 10%+ Owner
|
19%
|
$910,422,224
32,879,098 shares
|
$0 | 30 Sep 2025 |
| SHOPIFY INC. |
13D/G
Shopify Strategic Holdings 3 LLC
|
19%
|
$886,841,973
32,027,518 shares
|
+$28,607,813 | 29 Aug 2025 |
| SUMMIT PARTNERS L P |
13F
13D/G
3/4/5
Company · 10%+ Owner
|
12%
from 13D/G
|
$612,149,702
18,852,778 shares
|
— | 31 Dec 2025 |
| Accomplice Fund I, L.P. |
13D/G
3/4/5
Jeff Fagnan · 10%+ Owner
|
10%
|
$322,309,237
11,137,154 shares
|
$0 | 31 Mar 2025 |
| VANGUARD GROUP INC |
13F
13D/G
Company · The Vanguard Group
|
10%
from 13D/G
|
$466,319,204
14,361,540 shares
|
— | 31 Dec 2025 |
| Capital International Investors |
13F
13D/G
Company
|
8%
from 13D/G
|
$415,253,830
12,788,846 shares
|
— | 31 Dec 2025 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
13F holder rows
Institutional holders as of Q1 2026
Investor-level positions for this CUSIP, loaded as an interactive table.
Institutions
261
Shares
154,261,478
Rows available
261
| Investor | Option | Weight % | Change % | SEC-reported value | * Price | Shares | Share Change | Activity | Report Period |
|---|
* SEC-reported price is the security price as of the portfolio date and can indicate the last known price at which the security was still held. The marker flags a reported price that did not pass the local price check.
Compare Q1 2026 vs Q1 2026 Across Filers
Q1 2026 holders
261
Q1 2026 holders
261
Holder diff
0
| Investor | Q1 2026 Shares | Q1 2026 Shares | Share Diff | Share Chg % | Q1 2026 value | Q1 2026 value | Value change | Value Chg % |
|---|