Klaviyo, Inc.
US ˙ NYSE ˙ US49845K1016

SecurityKVYO / Klaviyo, Inc.
InstitutionCitadel Advisors Llc
ManagerKen Griffin
Latest Disclosed Ownership1,162,379 shares
Latest Disclosed Value $ 22,619,895
Citadel Advisors Llc ownership in KVYO / Klaviyo, Inc.

On May 15, 2026 - Citadel Advisors Llc filed a 13F-HR form disclosing ownership of 1,162,379 shares of Klaviyo, Inc. (US:KVYO) valued at $22,619,895 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 315,769 shares of Klaviyo, Inc.. This represents a change in shares of 268.11% during the quarter. The current value of the position is $18,109,865 USD.

Citadel Advisors Llc has a history of taking positions in derivatives of the underlying security (KVYO) in the form of stock options. The firm currently holds call options representing 259,900 of underlying shares valued at $5,057,654 USD and put options representing 187,900 of underlying shares valued at $3,656,534 USD .

Note: prior versions of this page mistakenly stated that the share values represented the number of options, not the number of underlying shares. For more information on the data backing these reports, please see the SEC document Frequently Asked Questions About Form 13F.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Institutional Put/Call Ratios
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In addition to reporting standard equity and debt issues, institutions with more than 100MM assets under management must also disclose their put and call option holdings. Since put options generally indicate negative sentiment, and call options indicate positive sentiment, we can get a sense of the overall institutional sentiment by plotting the ratio of puts to calls. The chart to the right plots the historical put/call ratio for this instrument.

Using Put/Call Ratio as an indicator of investor sentiment overcomes one of the key deficiencies of using total institutional ownership, which is that a significant amount of assets under management are invested passively to track indices. Passively-managed funds do not typically buy options, so the put/call ratio indicator more closely tracks the sentiment of actively-managed funds.

KVYO / Klaviyo, Inc. Historical Put/Call Ratio
Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date
Effective
Date
Form Security Class ID Avg Price
Paid (Est)
Reported
Shares
ΔShares ΔShares
(%)
Reported
Value
(x1000)
ΔValue
(%)
Alloc
(%)
ΔAlloc ΔAlloc (%) Cost Basis
(x1000)
Unrealized
Gain/Loss
(x1000)
2026-05-15 2026-03-31 13F KLAVIYO COM SER A 49845K101 1,162,379 846,610 268.11 22,620 120.61 0.0032
2026-02-17 2025-12-31 13F KLAVIYO COM SER A 49845K101 315,769 -2,676,729 -89.45 10,253 -87.63 0.0015
2025-11-14 2025-09-30 13F KLAVIYO COM SER A 49845K101 2,992,498 2,356,579 370.58 82,862 288.04 0.0126
2025-08-14 2025-06-30 13F KLAVIYO COM SER A 49845K101 635,919 -296,196 -31.78 21,354 -24.29 0.0037
2025-05-15 2025-03-31 13F KLAVIYO COM SER A 49845K101 932,115 432,769 86.67 28,206 36.96 0.0053
2025-02-14 2024-12-31 13F KLAVIYO COM SER A 49845K101 499,346 86,086 20.83 20,593 40.85 0.0036
2024-11-14 2024-09-30 13F KLAVIYO COM SER A 49845K101 413,260 -184,960 -30.92 14,621 -1.80 0.0028
2024-08-14 2024-06-30 13F KLAVIYO COM SER A 49845K101 598,220 575,961 2,587.54 14,890 2,525.93 0.0030
2024-05-15 2024-03-31 13F KLAVIYO COM SER A 49845K101 22,259 -41,661 -65.18 567 -68.06 0.0001
2024-02-14 2023-12-31 13F KLAVIYO COM SER A 49845K101 63,920 -246,635 -79.42 1,776 -83.43 0.0004
2023-11-14 2023-09-30 13F KLAVIYO COM SER A 49845K101 310,555 310,555 10,714 0.0023
Disclosed Call Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share
Price
Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F KLAVIYO COM SER A Call 259,900 -9.47 5,058 -45.75 n/a n/a n/a
2026-02-17 2025-12-31 13F KLAVIYO COM SER A Call 287,100 10.72 9,322 29.83 n/a n/a n/a
2025-11-14 2025-09-30 13F KLAVIYO COM SER A Call 259,300 19.77 7,180 -1.24 n/a n/a n/a
2025-08-14 2025-06-30 13F KLAVIYO COM SER A Call 216,500 -30.94 7,270 -23.36 n/a n/a n/a
2025-05-15 2025-03-31 13F KLAVIYO COM SER A Call 313,500 38.29 9,487 1.47 n/a n/a n/a
2025-02-14 2024-12-31 13F KLAVIYO COM SER A Call 226,700 -30.14 9,349 -18.56 n/a n/a n/a
2024-11-14 2024-09-30 13F KLAVIYO COM SER A Call 324,500 68.57 11,481 139.62 n/a n/a n/a
2024-08-14 2024-06-30 13F KLAVIYO COM SER A Call 192,500 189.04 4,791 182.49 n/a n/a n/a
2024-05-15 2024-03-31 13F KLAVIYO COM SER A Call 66,600 311.11 1,697 276.89 n/a n/a n/a
2024-02-14 2023-12-31 13F KLAVIYO COM SER A Call 16,200 20.00 450 -3.23 n/a n/a n/a
2023-11-14 2023-09-30 13F KLAVIYO COM SER A Call 13,500 466 n/a n/a n/a
Disclosed Put Options
File
Date
Effective
Date
Form Security Class ID Opt Avg Share Price Shares ΔShares
(%)
Value
(x1000)
ΔValue
(%)
Prior Allocation
(%)
Allocation
(%)
ΔAllocation
(%)
Cost Basis
(x1000)
Profit
(x1000)
Return
(%)
2026-05-15 2026-03-31 13F KLAVIYO COM SER A Put 187,900 36.26 3,657 -18.34 n/a n/a n/a
2026-02-17 2025-12-31 13F KLAVIYO COM SER A Put 137,900 -10.97 4,478 4.38 n/a n/a n/a
2025-11-14 2025-09-30 13F KLAVIYO COM SER A Put 154,900 -32.12 4,289 -44.02 n/a n/a n/a
2025-08-14 2025-06-30 13F KLAVIYO COM SER A Put 228,200 -41.06 7,663 -34.60 n/a n/a n/a
2025-05-15 2025-03-31 13F KLAVIYO COM SER A Put 387,200 9.72 11,717 -19.49 n/a n/a n/a
2025-02-14 2024-12-31 13F KLAVIYO COM SER A Put 352,900 220.82 14,554 274.02 n/a n/a n/a
2024-11-14 2024-09-30 13F KLAVIYO COM SER A Put 110,000 -23.18 3,892 9.18 n/a n/a n/a
2024-08-14 2024-06-30 13F KLAVIYO COM SER A Put 143,200 63.28 3,564 59.53 n/a n/a n/a
2024-05-15 2024-03-31 13F KLAVIYO COM SER A Put 87,700 93.17 2,235 77.16 n/a n/a n/a
2024-02-14 2023-12-31 13F KLAVIYO COM SER A Put 45,400 421.84 1,261 320.33 n/a n/a n/a
2023-11-14 2023-09-30 13F KLAVIYO COM SER A Put 8,700 300 n/a n/a n/a
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.