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  4. [Form 4] SIMILARWEB LTD. Insider Trading Activity

Similarweb (SMWB) CEO sells option shares in one-day August 26 trade

Filing Impact
(Neutral)
Filing Sentiment
(Neutral)
Form Type
4

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) reported that Chief Executive Officer Offer Or exercised several option grants and sold the resulting ordinary shares on August 26, 2026. He exercised options covering 383,127 ordinary shares at exercise prices of $0.40, $2.71, and $3.04 per share and acquired the corresponding shares. On the same date, he sold all 383,127 ordinary shares in a series of open market or private transactions at weighted average prices ranging from about $9.00 to just over $9.05 per share. The form does not report his post-transaction share or option holdings.

Positive

  • None.

Negative

  • None.
Insider Offer Or
Role Chief Executive Officer
Sold 383,127 shs ($3.45M)
Approx. gross sale proceeds $3.45M
Approx. exercise cost $994K
Approx. pre-tax spread $2.46M
Type Security Shares Price Value
Exercise Options to purchase one Ordinary Share F1 164,817 $0.00 $0.00
Exercise Options to purchase one Ordinary Share F1 39,302 $0.00 $0.00
Exercise Options to purchase one Ordinary Share F1 39,000 $0.00 $0.00
Exercise Options to purchase one Ordinary Share F1 140,008 $0.00 $0.00
Exercise Ordinary shares F2 164,817 $2.71 $447K
Sale Ordinary shares F3 164,817 $9.0006 $1.48M
Exercise Ordinary shares F2 39,302 $2.71 $107K
Sale Ordinary shares F4 39,302 $9.0121 $354K
Exercise Ordinary shares F2 39,000 $0.40 $16K
Sale Ordinary shares F5 39,000 $9.0043 $351K
Exercise Ordinary shares F2 140,008 $3.04 $426K
Sale Ordinary shares F6 140,008 $9.0054 $1.26M
Holdings After Transaction: Options to purchase one Ordinary Share — 1,500,000 shares (Direct); Ordinary shares — 4,598,291 shares (Direct)
Footnotes (6)
  1. F1. The options reported herein were exercised and the underlying shares were sold on the same date as reported in Table I.
  2. F2. The shares were acquired upon the exercise of stock options
  3. F3. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.00 to $9.01. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
  4. F4. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.012 to $9.03. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
  5. F5. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.00 to $9.05. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
  6. F6. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.00 to $9.055. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
Options exercised 383,127 shares Total underlying SIMILARWEB LTD. ordinary shares from option exercises on August 26, 2026
Shares sold 383,127 shares Ordinary shares sold by Offer Or on August 26, 2026
Exercise price $2.71 per share Option exercise price for 204,119 options (164,817 + 39,302) exercised August 26, 2026
Exercise price $0.40 per share Option exercise price for 39,000 options exercised August 26, 2026
Exercise price $3.04 per share Option exercise price for 140,008 options exercised August 26, 2026
Sale price (weighted average) $9.0006 per share Weighted average price for sale of 164,817 ordinary shares
Sale price (weighted average) $9.0121 per share Weighted average price for sale of 39,302 ordinary shares
Net share change -383,127 shares Net of all reported buys and sells in transactionSummary (net-sell direction)
derivative security financial
"transaction_code_description": "Exercise or conversion of derivative security"
A derivative security is a financial contract whose value comes from the price or performance of something else, such as a stock, bond, commodity, or market index. For investors it acts like an insurance policy or a wager: it can be used to protect against losses, lock in prices, or amplify gains and losses, so it can change a portfolio’s risk and potential return without owning the underlying asset directly.
stock options financial
"The shares were acquired upon the exercise of stock options"
Stock options are agreements that give a person the right to buy or sell a company's stock at a specific price within a certain time frame. They are often used as a reward or incentive, similar to a coupon that can be used later if the stock price rises, allowing the holder to make a profit.
weighted average price financial
"The price reported is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
open market or private transaction financial
"transaction_code_description": "Sale in open market or private transaction"

FAQ

What did SMWB CEO Offer Or report in this Form 4 transaction?
Offer Or exercised stock options for 383,127 ordinary shares of SIMILARWEB LTD. and sold all of those shares on August 26, 2026 in a series of transactions described as open market or private transactions.

How many SIMILARWEB (SMWB) shares did the CEO sell and at what prices?
Offer Or sold 383,127 ordinary shares of SIMILARWEB LTD. at weighted average prices per share of $9.0006, $9.0121, $9.0043, and $9.0054, with individual trades ranging roughly from $9.00 to slightly above $9.05.

What option exercise prices were reported in SMWB CEO Offer Or’s Form 4?
Offer Or exercised options to acquire SIMILARWEB LTD. ordinary shares at exercise prices of $0.40, $2.71, and $3.04 per share, covering a total of 383,127 underlying shares.

Were the SMWB share sales under a Rule 10b5-1 trading plan?
The filing’s Rule 10b5-1 checkbox is unchecked and there is no footnote stating that the transactions were made pursuant to a Rule 10b5-1 trading plan.

Does the Form 4 state Offer Or’s remaining SMWB holdings after these trades?
No. The non-derivative and derivative transaction lines in the Form 4 list the exercised and sold shares, but the total shares following the transactions are not reported in the structured data provided.

AI-generated analysis. How Rhea-AI works. Not financial advice.

Form 4 Insider Transactions: What Each Field Means →
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SEC Form 4
FORM 4UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940
OMB APPROVAL
OMB Number:3235-0287
Estimated average burden
hours per response:0.5
Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).
Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.
1. Name and Address of Reporting Person*
Offer Or
(Last)(First)(Middle)
87 HAZOREA ST.
(Street)
KFAR SHMARYAHU
(City)(State)(Zip)
ISRAEL
(Country)		2. Issuer Name and Ticker or Trading Symbol
SIMILARWEB LTD. [ SMWB ] 		5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)
Director10% Owner
XOfficer (give title below)Other (specify below)
Chief Executive Officer
2a. Foreign Trading Symbol
3. Date of Earliest Transaction (Month/Day/Year)
08/26/2026		6. Individual or Joint/Group Filing (Check Applicable Line)
XForm filed by One Reporting Person
Form filed by More than One Reporting Person
4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3) 2. Transaction Date (Month/Day/Year)2A. Deemed Execution Date, if any (Month/Day/Year)3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeVAmount(A) or (D)Price
Ordinary shares08/26/2026M164,817(2)A$2.714,763,108D
Ordinary shares08/26/2026S164,817D$9.0006(3)4,598,291D
Ordinary shares08/26/2026M39,302(2)A$2.714,637,593D
Ordinary shares08/26/2026S39,302D$9.0121(4)4,598,291D
Ordinary shares08/26/2026M39,000(2)A$0.44,637,291D
Ordinary shares08/26/2026S39,000D$9.0043(5)4,598,291D
Ordinary shares08/26/2026M140,008(2)A$3.044,738,299D
Ordinary shares08/26/2026S140,008D$9.0054(6)4,598,291D
Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned
(e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (Month/Day/Year)3A. Deemed Execution Date, if any (Month/Day/Year)4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 6. Date Exercisable and Expiration Date (Month/Day/Year)7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4)
CodeV(A)(D)Date ExercisableExpiration DateTitleAmount or Number of Shares
Options to purchase one Ordinary Share$2.7108/26/2026M(1)164,81711/20/202011/19/2028Ordinary shares164,817$0400,000D
Options to purchase one Ordinary Share$2.7108/26/2026M(1)39,30211/20/201911/19/2028Ordinary shares39,302$0400,000D
Options to purchase one Ordinary Share$0.408/26/2026M(1)39,00002/14/201502/14/2028Ordinary shares39,000$0700,000D
Options to purchase one Ordinary Share$3.0408/26/2026M(1)140,00801/29/202201/28/2031Ordinary shares140,008$00D
Explanation of Responses:
1. The options reported herein were exercised and the underlying shares were sold on the same date as reported in Table I.
2. The shares were acquired upon the exercise of stock options
3. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.00 to $9.01. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
4. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.012 to $9.03. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
5. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.00 to $9.05. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
6. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $9.00 to $9.055. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
/s/ Meirav Shemesh on behalf of Oppenheimer Israel, as Attorney-in-fact08/27/2026
** Signature of Reporting PersonDate
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)

Source: View Original Filing on SEC EDGAR