Vault-13

SIMILARWEB LTD SMWB

SHS · Common Stock · CUSIP M84137104

47 institutional holders +1 vs Q3 2022
28,985,31129.0m shares reported held*
37.9% of all shares outstanding*
$184.5mreported value*
11 new 9 added 11 reduced 11 sold out net bought ≈ $1.4m (+212.2k 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. Shares outstanding: 76.4m as of 2022-12-31, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $6.37. Options: 5 managers hold calls ($4.2m notional), 4 hold puts ($1.5m).

Trends to Q4 2022

Institutional holders

Managers reporting a position, each quarter

0204060Q3 22: 46Q4 22: 4747Q3 22Q4 22
Numbers
QuarterHolders
Q3 202246
Q4 202247

Calls vs puts

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

CallsPuts
$0$2m$4m$6mQ3 22 calls: $1.0mQ3 22 puts: $3.6mQ3 22P/C 3.53Q4 22 calls: $4.2mQ4 22 puts: $1.5mQ4 22P/C 0.36
Numbers
QuarterCallsPutsP/C
Q3 2022$1.0m$3.6m3.53
Q4 2022$4.2m$1.5m0.36

Biggest buyers

Portolan Capital Management, LLC New +888,184+888.2k
Union Investments & Development Ltd. New +641,962+642.0k
NORTH RUN CAPITAL, LP New +375,000+375.0k
Baader Bank Aktiengesellschaft New +246,970+247.0k
ARK Investment Management LLC Added +104,483+104.5k
Horrell Capital Management, Inc. New +86,000+86.0k
Veritable, L.P. New +35,000+35.0k
Belvedere Trading LLC New +29,495+29.5k
SIMPLEX TRADING, LLC Added +28,675+28.7k
STATE STREET CORP Added +22,100+22.1k

Biggest sellers

BAMCO INC /NY/ Reduced -411,012-411.0k
MILLENNIUM MANAGEMENT LLC Sold out -398,109-398.1k
Phoenix Financial Ltd. Sold out -330,561-330.6k
BESSEMER GROUP INC Sold out -312,677-312.7k
Ulysses Management LLC Reduced -146,484-146.5k
SUSQUEHANNA INTERNATIONAL GROUP, LLP Sold out -145,519-145.5k
MARSHALL WACE, LLP Reduced -89,956-90.0k
BLAIR WILLIAM & CO/IL Reduced -83,001-83.0k
WOLVERINE TRADING, LLC Sold out -56,785-56.8k
ETF MANAGERS GROUP, LLC Sold out -50,300-50.3k

Biggest calls

Phoenix Financial Ltd. Added $4.2m647.7k shares
CITADEL ADVISORS LLC Reduced $8.4k1.3k shares
GROUP ONE TRADING LLC New $6.4k1.0k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 shares
SIMPLEX TRADING, LLC New $0100 shares

Biggest puts

SIMPLEX TRADING, LLC Reduced $972.0k151.3k shares
CITADEL ADVISORS LLC Reduced $291.9k45.4k shares
Belvedere Trading LLC New $221.8k34.5k shares
CONCOURSE FINANCIAL GROUP SECURITIES, INC. Unchanged $00 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 in Q4 2022

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.

None reported in Q4 2022.

Holders, Q4 2022

#ManagerLocationShares Value% of their portfolioChangeShares change
1 NASPERS LTD 9.46% of their portfolio CAPETOWN, T3 11,173,26511.2m $71.8m $71.8m 9.46% Unchanged
2 ION Crossover Partners Ltd 87.08% of their portfolio Herzliya Pituach, L3 5,772,1835.8m $37.1m $37.1m 87.08% Unchanged
3 Ulysses Management LLC 4.28% of their portfolio New York, NY 2,267,2672.3m $14.6m $14.6m 4.28% Reduced -146.5k -146,484
4 Alpha Family Trust 9.76% of their portfolio Los Angeles, CA 1,681,7771.7m $10.8m $10.8m 9.76% Unchanged
5 Migdal Insurance & Financial Holdings Ltd. 0.23% of their portfolio Petach Tikva, L3 1,586,9501.6m $10.2m $10.2m 0.23% Reduced -50.0k -50,000
6 Y.D. More Investments Ltd 2.06% of their portfolio Ramat Gan, L3 1,511,8661.5m $8.3m $8.3m 2.06% First filing
7 Portolan Capital Management, LLC 0.57% of their portfolio BOSTON, MA 888,184888.2k $5.7m $5.7m 0.57% New
8 Union Investments & Development Ltd. 2.60% of their portfolio Tel Aviv, L3 641,962642.0k $4.4m $4.4m 2.60% New
9 MEITAV INVESTMENT HOUSE LTD 0.05% of their portfolio BENE-BERAQ, L3 550,821550.8k $3.0m $3.0m 0.05% Unchanged
10 NORTH RUN CAPITAL, LP 5.54% of their portfolio BOSTON, MA 375,000375.0k $2.4m $2.4m 5.54% New
11 ARK Investment Management LLC 0.02% of their portfolio ST. PETERSBURG, FL 334,983335.0k $2.2m $2.2m 0.02% Added +104.5k +104,483
12 Old Well Partners, LLC 1.65% of their portfolio CHARLOTTE, NC 296,304296.3k $1.9m $1.9m 1.65% Added +4.6k +4,551
13 BLAIR WILLIAM & CO/IL 0.01% of their portfolio CHICAGO, IL 286,465286.5k $1.8m $1.8m 0.01% Reduced -83.0k -83,001
14 Premier Fund Managers Ltd 0.06% of their portfolio GUILDFORD, X0 265,855265.9k $1.5m $1.5m 0.06% Unchanged
15 BlackRock Inc. 0.00% of their portfolio New York, NY 248,701248.7k $1.6m $1.6m 0.00% Reduced -45.5k -45,525
16 Baader Bank Aktiengesellschaft 0.15% of their portfolio Unterschleissheim, 2M 246,970247.0k $1.6m $1.6m 0.15% New
17 TUDOR INVESTMENT CORP ET AL 0.02% of their portfolio STAMFORD, CT 136,244136.2k $876.0k $876.0k 0.02% Added +858 +858
18 BAMCO INC /NY/ 0.00% of their portfolio NEW YORK, NY 128,887128.9k $828.7k $828.7k 0.00% Reduced -411.0k -411,012
19 STATE STREET CORP 0.00% of their portfolio BOSTON, MA 111,634111.6k $717.8k $717.8k 0.00% Added +22.1k +22,100
20 Horrell Capital Management, Inc. 0.18% of their portfolio LITTLE ROCK, AR 86,00086.0k $553.0k $553.0k 0.18% New
21 SIMPLEX TRADING, LLC 0.02% of their portfolio CHICAGO, IL 59,82759.8k $384.0k $384.0k 0.02% Added +28.7k +28,675
22 Swiss National Bank 0.00% of their portfolio ZURICH, V8 44,38844.4k $285.4k $285.4k 0.00% Unchanged
23 Veritable, L.P. 0.00% of their portfolio Newtown Square, PA 35,00035.0k $225.1k $225.1k 0.00% New
24 UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC 0.00% of their portfolio NEW YORK, NY 33,20033.2k $213.5k $213.5k 0.00% Unchanged
25 Belvedere Trading LLC 0.11% of their portfolio CHICAGO, IL 29,49529.5k $189.7k $189.7k 0.11% New
26 MARSHALL WACE, LLP 0.00% of their portfolio LONDON, X0 23,17323.2k $149.0k $149.0k 0.00% Reduced -90.0k -89,956
27 RENAISSANCE TECHNOLOGIES LLC 0.00% of their portfolio NEW YORK, NY 22,40022.4k $144.0k $144.0k 0.00% Added +6.4k +6,400
28 CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM 0.00% of their portfolio WEST SACRAMENTO, CA 20,29520.3k $130.5k $130.5k 0.00% Unchanged
29 Yarbrough Capital, LLC 0.01% of their portfolio FRANKLIN, TN 17,20017.2k $110.6k $110.6k 0.01% Unchanged
30 VANGUARD GROUP INC 0.00% of their portfolio Valley Forge, PA 17,09617.1k $109.9k $109.9k 0.00% Unchanged
31 CREDIT SUISSE AG/ 0.00% of their portfolio ZURICH, V8 17,01117.0k $109.4k $109.4k 0.00% Reduced -8.8k -8,839
32 PDT Partners, LLC 0.02% of their portfolio New York, NY 16,65616.7k $107.1k $107.1k 0.02% New
33 MORGAN STANLEY 0.00% of their portfolio NEW YORK, NY 15,31815.3k $98.5k $98.5k 0.00% Added +2.1k +2,110
34 Caprock Group, LLC 0.01% of their portfolio BOISE, ID 12,50012.5k $80.4k $80.4k 0.01% Unchanged
35 LAZARD ASSET MANAGEMENT LLC 0.00% of their portfolio NEW YORK, NY 7,4547.5k $47.0k $47.0k 0.00% New
36 ANTIPODES PARTNERS Ltd 0.00% of their portfolio ROYAL EXCHANGE, C3 5,2635.3k $33.0k $33.0k 0.00% New
37 Legal & General Group Plc 0.00% of their portfolio London, X0 4,1714.2k $26.8k $26.8k 0.00% Added +1.6k +1,640
38 CITIGROUP INC 0.00% of their portfolio NEW YORK, NY 4,1154.1k $26.5k $26.5k 0.00% Reduced -16.1k -16,126
39 WELLS FARGO & COMPANY/MN 0.00% of their portfolio SAN FRANCISCO, CA 3,1383.1k $20.2k $20.2k 0.00% Unchanged
40 Harel Insurance Investments & Financial Services Ltd. 0.00% of their portfolio Ramat Gan, L3 2,1852.2k $14.0k $14.0k 0.00% Reduced -233 -233
41 UBS Group AG 0.00% of their portfolio ZURICH, V8 1,9662.0k $12.6k $12.6k 0.00% New
42 BANK OF AMERICA CORP /DE/ 0.00% of their portfolio CHARLOTTE, NC 1,3321.3k $8.6k $8.6k 0.00% Reduced -22.5k -22,535
43 SIGNATUREFD, LLC 0.00% of their portfolio ATLANTA, GA 447447 $2.9k $2.9k 0.00% Unchanged
44 JPMORGAN CHASE & CO 0.00% of their portfolio NEW YORK, NY 300300 $2.0k $2.0k 0.00% Reduced -34.4k -34,372
45 ROYAL BANK OF CANADA 0.00% of their portfolio TORONTO, A6 5757 $0 $0 0.00% Added +56 +56
46 FMR LLC 0.00% of their portfolio BOSTON, MA 66 $39 $39 0.00% Unchanged
47 CONCOURSE FINANCIAL GROUP SECURITIES, INC. 0.00% of their portfolio BIRMINGHAM, AL 00 $0 $0 0.00% Unchanged