Vault-13

SIMILARWEB LTD SMWB

SHS · Common Stock · CUSIP M84137104

70 institutional holders -11 vs Q1 2026
40,072,79740.1m shares reported held*
$245.8mreported value*
16 new 19 added 20 reduced 27 sold out net sold ≈ $16.2m (-2.6m shares)

* 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. Holder counts are more reliable. Implied quarter-end price ≈ $6.13. Options: 6 managers hold calls ($1.8m notional), 2 hold puts ($99.3k).

Trends to Q2 2026

Institutional holders

Managers reporting a position, each quarter

050100150Q3 22: 46Q4 22: 47Q1 23: 42Q2 23: 49Q3 23: 52Q4 23: 55Q1 24: 74Q2 24: 77Q3 24: 95Q4 24: 113Q1 25: 110Q2 25: 112Q3 25: 95Q4 25: 99Q1 26: 81Q2 26: 7070Q3 22Q3 23Q3 24Q3 25Q2 26
Numbers
QuarterHolders
Q3 202246
Q4 202247
Q1 202342
Q2 202349
Q3 202352
Q4 202355
Q1 202474
Q2 202477
Q3 202495
Q4 2024113
Q1 2025110
Q2 2025112
Q3 202595
Q4 202599
Q1 202681
Q2 202670

Buyers vs sellers

Managers adding to or starting a position, vs cutting or selling out

Bought or addedCut or sold out
1000100Q3 24: 63 bought or addedQ3 24: 24 cut or sold outQ4 24: 68 bought or addedQ4 24: 34 cut or sold outQ4 24Q1 25: 56 bought or addedQ1 25: 65 cut or sold outQ2 25: 68 bought or addedQ2 25: 48 cut or sold outQ2 25Q3 25: 40 bought or addedQ3 25: 62 cut or sold outQ4 25: 45 bought or addedQ4 25: 43 cut or sold outQ4 25Q1 26: 50 bought or addedQ1 26: 54 cut or sold outQ2 26: 35 bought or addedQ2 26: 47 cut or sold outQ2 26
Numbers
QuarterBought or addedCut or sold out
Q3 20246324
Q4 20246834
Q1 20255665
Q2 20256848
Q3 20254062
Q4 20254543
Q1 20265054
Q2 20263547

Calls vs puts

Options held, notional value, last 4 quarters. P/C = puts ÷ calls

CallsPuts
$0$10m$20m$30mQ3 25 calls: $2.8mQ3 25 puts: $22.4mQ3 25P/C 8.08Q4 25 calls: $1.0mQ4 25 puts: $5.5mQ4 25P/C 5.40Q1 26 calls: $158.4kQ1 26 puts: $327.0kQ1 26P/C 2.06Q2 26 calls: $1.8mQ2 26 puts: $99.3kQ2 26P/C 0.05
Numbers
QuarterCallsPutsP/C
Q3 2025$2.8m$22.4m8.08
Q4 2025$1.0m$5.5m5.40
Q1 2026$158.4k$327.0k2.06
Q2 2026$1.8m$99.3k0.05

Biggest buyers

Schonfeld Strategic Advisors LLC Added +921,455+921.5k
WELLINGTON MANAGEMENT GROUP LLP Added +657,928+657.9k
Lotus Technology Management, LP New +531,409+531.4k
ARK Investment Management LLC Added +482,593+482.6k
JANE STREET GROUP, LLC Added +282,011+282.0k
NANO CAP NEW MILLENNIUM GROWTH FUND L P Added +260,000+260.0k
UBS Group AG Added +204,785+204.8k
PEAK6 LLC Added +163,666+163.7k
ANTIPODES PARTNERS Ltd New +145,601+145.6k
P.A.W. CAPITAL CORP Added +140,000+140.0k

Biggest sellers

MILLENNIUM MANAGEMENT LLC Reduced -807,565-807.6k
MIRABELLA FINANCIAL SERVICES LLP Sold out -792,664-792.7k
CenterBook Partners LP Reduced -725,376-725.4k
Militia Capital Management LLC Sold out -691,264-691.3k
MARSHALL WACE, LLP Reduced -577,207-577.2k
ACADIAN ASSET MANAGEMENT LLC Reduced -398,857-398.9k
Qube Research & Technologies Ltd Reduced -384,299-384.3k
Penn Capital Management Company, LLC Sold out -360,366-360.4k
MORGAN STANLEY Reduced -323,660-323.7k
XTX Topco Ltd Reduced -217,974-218.0k

Biggest calls

GROUP ONE TRADING LLC New $760.7k124.1k shares
JANE STREET GROUP, LLC New $543.7k88.7k shares
CITADEL ADVISORS LLC New $237.8k38.8k shares
IMC-Chicago, LLC New $165.5k27.0k shares
SIMPLEX TRADING, LLC Added $104.2k17.0k shares
PEAK6 LLC Reduced $18.4k3.0k shares

Biggest puts

CITADEL ADVISORS LLC Reduced $88.3k14.4k shares
SIMPLEX TRADING, LLC Added $11.0k1.8k 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.

HolderStakeChangeShares Last filed
Viola Growth Management Fund 2 Ltd. 13G · exempt (held before listing) filed 2025-02-12 13.2% 10.8m≈ $66.3m 2025-02-12

Fell to 5% or below in the last year: Phoenix Financial Ltd. (2.9%, 2026-02-24)

Insider purchases and sales since 1 Apr 2026

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)

BuyingSelling
404Q4 24: 0 buyingQ4 24: 0 sellingQ1 25: 0 buyingQ1 25: 0 sellingQ1 25Q2 25: 0 buyingQ2 25: 0 sellingQ3 25: 0 buyingQ3 25: 0 sellingQ3 25Q4 25: 0 buyingQ4 25: 0 sellingQ1 26: 0 buyingQ1 26: 0 sellingQ1 26Q2 26: 4 buyingQ2 26: 0 sellingQ3 26: 0 buyingQ3 26: 1 sellingQ3 26
Numbers
QuarterBuyingBoughtSellingSoldSold under a plan
Q4 20240—0——
Q1 20250—0——
Q2 20250—0——
Q3 20250—0——
Q4 20250—0——
Q1 20260—0——
Q2 20264$1.0m0——
Q3 20260—1$15.2m$5.5m
DateInsiderTradeSharesPrice ValueTheir holding
2026-09-24 Offer Or Chief Executive Officer Sold plan 114,300 $7.69 $879.2k114.3k shares -3%
2026-09-23 Offer Or Chief Executive Officer Sold plan 28,400 $8.54 $242.5k28.4k shares -1%
2026-09-22 Offer Or Chief Executive Officer Sold plan 34,500 $8.38 $289.1k34.5k shares -1%
2026-09-21 Offer Or Chief Executive Officer Sold plan 32,200 $8.40 $270.5k32.2k shares -1%
2026-09-18 Offer Or Chief Executive Officer Sold plan 37,500 $8.25 $309.4k37.5k shares -1%
2026-09-17 Offer Or Chief Executive Officer Sold plan 30,400 $8.35 $253.8k30.4k shares -1%
2026-09-16 Offer Or Chief Executive Officer Sold plan 45,719 $8.40 $384.0k45.7k shares -1%
2026-09-15 Offer Or Chief Executive Officer Sold plan 26,691 $8.53 $227.7k26.7k shares -1%
2026-09-14 Offer Or Chief Executive Officer Sold plan 52,900 $8.54 $451.8k52.9k shares -1%
2026-09-11 Offer Or Chief Executive Officer Sold plan 59,000 $8.05 $475.0k59.0k shares -1%
2026-09-10 Offer Or Chief Executive Officer Sold plan 59,200 $8.06 $477.2k59.2k shares -1%
2026-09-09 Offer Or Chief Executive Officer Sold plan 86,300 $8.06 $695.6k86.3k shares -2%
2026-09-08 Offer Or Chief Executive Officer Sold plan 60,700 $8.33 $505.6k60.7k shares -1%
2026-08-26 Offer Or Chief Executive Officer Sold 383,127 $9.00 $3.4m383.1k shares -8%
2026-08-14 Offer Or Chief Executive Officer Sold 134,992 $8.87 $1.2m135.0k shares -3%
2026-08-13 Offer Or Chief Executive Officer Sold 574,605 $8.80 $5.1m574.6k shares -11%
2026-06-01 Offer Or Chief Executive Officer, director Bought 50,000 $4.15 $207.5k50.0k shares +1%
2026-05-21 Eilam Barak Director Bought 50,000 $3.86 $193.0k50.0k shares +97%
2026-05-20 Beit-On Harel Moshe Director Bought 75,000 $3.89 $291.8k75.0k shares +1%
2026-05-19 Offer Or Chief Executive Officer, director Bought 53,000 $3.58 $189.7k53.0k shares +1%
2026-05-18 Rapaport-Dagim Tamar Director Bought 40,000 $3.22 $128.8k40.0k shares +170%
2026-05-18 Offer Or Chief Executive Officer, director Bought 3,105 $3.20 $9.9k3.1k shares +<1%

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, Q2 2026

#ManagerLocationShares Value% of their portfolioChangeShares change
1 NASPERS LTD 81.19% of their portfolio CAPETOWN, T3 11,173,26511.2m $68.5m $68.5m 81.19% Unchanged
2 MENORA MIVTACHIM HOLDINGS LTD. 0.10% of their portfolio Ramat Gan, L3 4,015,4944.0m $24.6m $24.6m 0.10% Unchanged
3 WELLINGTON MANAGEMENT GROUP LLP 0.00% of their portfolio Boston, MA 3,624,6853.6m $22.2m $22.2m 0.00% Added +657.9k +657,928
4 ION Crossover Partners Ltd 24.88% of their portfolio Herzliya Pituach, L3 3,030,8263.0m $18.6m $18.6m 24.88% Unchanged
5 Ulysses Management LLC 6.21% of their portfolio New York, NY 2,928,4742.9m $18.0m $18.0m 6.21% Reduced -70.0k -70,000
6 S SQUARED TECHNOLOGY, LLC 3.21% of their portfolio RYE, NY 1,690,0001.7m $10.4m $10.4m 3.21% Added +90.0k +90,000
7 Schonfeld Strategic Advisors LLC 0.04% of their portfolio NEW YORK, NY 1,210,6291.2m $7.4m $7.4m 0.04% Added +921.5k +921,455
8 Y.D. More Investments Ltd 0.22% of their portfolio Ramat Gan, L3 1,147,0351.1m $7.0m $7.0m 0.22% Reduced -4.3k -4,263
9 ARK Investment Management LLC 0.03% of their portfolio ST. PETERSBURG, FL 834,663834.7k $5.1m $5.1m 0.03% Added +482.6k +482,593
10 RENAISSANCE TECHNOLOGIES LLC 0.01% of their portfolio NEW YORK, NY 713,728713.7k $4.4m $4.4m 0.01% Reduced -25.9k -25,945
11 CDC Financial, Inc. 3.18% of their portfolio CHICAGO, IL 674,233674.2k $4.1m $4.1m 3.18% Added +35.2k +35,219
12 Alpha Family Trust 1.62% of their portfolio Los Angeles, CA 658,935658.9k $4.0m $4.0m 1.62% Unchanged
13 NANO CAP NEW MILLENNIUM GROWTH FUND L P 3.06% of their portfolio STATEN ISLAND, NY 650,000650.0k $4.0m $4.0m 3.06% Added +260.0k +260,000
14 HERALD INVESTMENT MANAGEMENT Ltd 0.54% of their portfolio LONDON, X0 645,465645.5k $4.0m $4.0m 0.54% Unchanged
15 P.A.W. CAPITAL CORP 3.00% of their portfolio GREENWICH, CT 640,000640.0k $3.9m $3.9m 3.00% Added +140.0k +140,000
16 Sphera Management Technology Funds Ltd 1.32% of their portfolio TEL AVIV, L3 615,000615.0k $3.8m $3.8m 1.32% Unchanged
17 CenterBook Partners LP 0.18% of their portfolio GREENWICH, CT 599,737599.7k $3.7m $3.7m 0.18% Reduced -725.4k -725,376
18 Lotus Technology Management, LP 4.18% of their portfolio ORLANDO, FL 531,409531.4k $3.4m $3.4m 4.18% New
19 JANE STREET GROUP, LLC 0.00% of their portfolio NEW YORK, NY 513,277513.3k $3.1m $3.1m 0.00% Added +282.0k +282,011
20 PEAK6 LLC 0.07% of their portfolio AUSTIN, TX 484,822484.8k $3.0m $3.0m 0.07% Added +163.7k +163,666
21 Connor, Clark & Lunn Investment Management Ltd. 0.01% of their portfolio VANCOUVER, A1 445,691445.7k $2.7m $2.7m 0.01% Reduced -87.9k -87,943
22 UBS Group AG 0.00% of their portfolio ZURICH, V8 403,328403.3k $2.5m $2.5m 0.00% Added +204.8k +204,785
23 CITADEL ADVISORS LLC 0.00% of their portfolio MIAMI, FL 346,735346.7k $2.1m $2.1m 0.00% Reduced -129.3k -129,270
24 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 268,203268.2k $1.6m $1.6m 0.00% Reduced -323.7k -323,660
25 LAVELLE CAPITAL LP 0.63% of their portfolio SAN FRANCISCO, CA 202,727202.7k $1.2m $1.2m 0.63% Unchanged
26 Persistent Asset Partners Ltd 0.35% of their portfolio HONG KONG, K3 180,000180.0k $1.1m $1.1m 0.35% Unchanged
27 SUSQUEHANNA FUNDAMENTAL INVESTMENTS, LLC 0.02% of their portfolio BALA CYNWYD, PA 169,885169.9k $1.0m $1.0m 0.02% Added +44.3k +44,262
28 D. E. Shaw & Co., Inc. 0.00% of their portfolio New York, NY 159,935159.9k $980.4k $980.4k 0.00% Added +101.4k +101,383
29 ANTIPODES PARTNERS Ltd 0.02% of their portfolio ROYAL EXCHANGE, C3 145,601145.6k $892.5k $892.5k 0.02% New
30 SUSQUEHANNA INTERNATIONAL GROUP, LLP 0.00% of their portfolio BALA CYNWYD, PA 138,417138.4k $848.5k $848.5k 0.00% New
31 BlackRock, Inc. 0.00% of their portfolio New York, NY 133,533133.5k $818.6k $818.6k 0.00% Added +6.0k +6,029
32 TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio NEW YORK, NY 129,851129.9k $796.0k $796.0k 0.00% Added +50.8k +50,775
33 MYDA Advisors LLC 0.15% of their portfolio WOODMERE, NY 100,000100.0k $613.0k $613.0k 0.15% New
34 Pathstone Holdings, LLC 0.00% of their portfolio ENGLEWOOD, NJ 99,39099.4k $609.3k $609.3k 0.00% Added +49.0k +49,000
35 GSA CAPITAL PARTNERS LLP 0.04% of their portfolio LONDON, X0 95,89995.9k $588.0k $588.0k 0.04% Reduced -56.2k -56,206
36 State of Wyoming 0.05% of their portfolio CHEYENNE, WY 88,45888.5k $542.2k $542.2k 0.05% New
37 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 77,05477.1k $472.3k $472.3k 0.00% Reduced -32.3k -32,342
38 Quadrature Capital Ltd 0.00% of their portfolio LONDON, X0 68,20768.2k $418.1k $418.1k 0.00% Reduced -26.0k -26,027
39 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 60,98161.0k $373.8k $373.8k 0.00% Reduced -577.2k -577,207
40 Centiva Capital, LP 0.01% of their portfolio New York, NY 45,91945.9k $281.5k $281.5k 0.01% Reduced -14.2k -14,203
41 WealthTrust Axiom LLC 0.06% of their portfolio WAYNE, PA 44,56544.6k $273.2k $273.2k 0.06% New
42 IMC-Chicago, LLC 0.00% of their portfolio CHICAGO, IL 37,50637.5k $229.9k $229.9k 0.00% New
43 SIMPLEX TRADING, LLC 0.01% of their portfolio CHICAGO, IL 33,06633.1k $202.7k $202.7k 0.01% Added +30.2k +30,162
44 Qube Research & Technologies Ltd 0.00% of their portfolio LONDON, X0 31,84731.8k $195.2k $195.2k 0.00% Reduced -384.3k -384,299
45 LAZARD ASSET MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 23,56623.6k $144.5k $144.5k 0.00% Added +12.3k +12,338
46 SG Americas Securities, LLC 0.00% of their portfolio NEW YORK, NY 22,06422.1k $135.0k $135.0k 0.00% New
47 MILLENNIUM MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 18,19818.2k $111.6k $111.6k 0.00% Reduced -807.6k -807,565
48 Integrated Wealth Concepts LLC 0.00% of their portfolio WALTHAM, MA 15,00015.0k $92.0k $92.0k 0.00% New
49 R Squared Ltd 0.04% of their portfolio HONG KONG, K3 11,25611.3k $69.0k $69.0k 0.04% New
50 XTX Topco Ltd 0.00% of their portfolio LONDON, X0 10,90610.9k $66.9k $66.9k 0.00% Reduced -218.0k -217,974
51 PRELUDE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio NEW YORK, NY 10,41110.4k $63.8k $63.8k 0.00% New
52 PharVision Advisers, LLC 1.20% of their portfolio BOCA RATON, FL 10,36810.4k $63.6k $63.6k 1.20% Reduced -8.6k -8,559
53 Olympiad Research LP 0.13% of their portfolio Stamford, CT 10,33710.3k $63.4k $63.4k 0.13% New
54 Cresset Asset Management, LLC 0.00% of their portfolio Chicago, IL 10,14410.1k $62.2k $62.2k 0.00% Unchanged
55 MARATHON CAPITAL MANAGEMENT 0.01% of their portfolio Hunt Valley, MD 10,00010.0k $61.3k $61.3k 0.01% New
56 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 9,2009.2k $56.4k $56.4k 0.00% Added +1.0k +1,000
57 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 7,5117.5k $46.0k $46.0k 0.00% Reduced -102.7k -102,663
58 ACADIAN ASSET MANAGEMENT LLC 0.00% of their portfolio Boston, MA 6,7506.8k $41.0k $41.0k 0.00% Reduced -398.9k -398,857
59 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 5,9005.9k $36.0k $36.0k 0.00% Added +5.7k +5,700
60 SBI Securities Co., Ltd. 0.00% of their portfolio TOKYO, M0 1,0241.0k $6.3k $6.3k 0.00% Unchanged
61 BARCLAYS PLC 0.00% of their portfolio LONDON, X0 690690 $4.2k $4.2k 0.00% Reduced -9.9k -9,921
62 Tower Research Capital LLC (TRC) 0.00% of their portfolio NEW YORK, NY 399399 $2.4k $2.4k 0.00% New
63 OSAIC HOLDINGS, INC. 0.00% of their portfolio SCOTTSDALE, AZ 300300 $1.8k $1.8k 0.00% Unchanged
64 Quarry LP 0.00% of their portfolio NEW YORK, NY 149149 $913 $913 0.00% New
65 JONES FINANCIAL COMPANIES LLLP 0.00% of their portfolio DES PERES, MO 100100 $560 $560 0.00% Unchanged
66 Smartleaf Asset Management LLC 0.00% of their portfolio BOSTON, MA 2929 $179 $179 0.00% Unchanged
67 Caitong International Asset Management Co., Ltd 0.00% of their portfolio HONG KONG, K3 1111 $67 $67 0.00% Reduced -231 -231
68 FMR LLC 0.00% of their portfolio BOSTON, MA 66 $37 $37 0.00% Unchanged
69 Farther Finance Advisors, LLC 0.00% of their portfolio SAN FRANCISCO, CA 33 $16 $16 0.00% New
70 Covestor Ltd 0.00% of their portfolio LONDON, X0 00 $0 $0 0.00% Unchanged