Similarweb officer plans Aug. 26 option share sale

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) received a Rule 144 notice from officer Or Offer covering planned sales of ordinary shares. The shares are to be sold through Oppenheimer & Co. Inc. on or after August 26, 2026 and will come from ordinary shares acquired upon cash exercise of employee stock options in four separate blocks.

The notice also lists prior sales by Or Offer during the past three months: ordinary shares sold on August 13, 2026 and August 14, 2026 for stated share amounts and dollar values. This filing is a disclosure of potential resale activity by an existing holder rather than a new share issuance by SIMILARWEB LTD.

Key Figures

Ordinary shares to be sold (block 1): 39,000 shares Ordinary shares to be sold (block 2): 140,008 shares Ordinary shares to be sold (block 3): 164,817 shares +5 more

8 metrics

Ordinary shares to be sold (block 1) 39,000 shares Securities To Be Sold section; ordinary shares acquired upon exercise of employee stock options as of August 26, 2026

Ordinary shares to be sold (block 2) 140,008 shares Securities To Be Sold section; ordinary shares acquired upon exercise of employee stock options as of August 26, 2026

Ordinary shares to be sold (block 3) 164,817 shares Securities To Be Sold section; ordinary shares acquired upon exercise of employee stock options as of August 26, 2026

Ordinary shares to be sold (block 4) 39,302 shares Securities To Be Sold section; ordinary shares acquired upon exercise of employee stock options as of August 26, 2026

Ordinary shares sold on August 13, 2026 574,605 shares Securities Sold During The Past 3 Months; ordinary shares sold by Or Offer

Proceeds on August 13, 2026 sale 5,057,419.85 Securities Sold During The Past 3 Months; dollar value for 574,605 ordinary shares sold by Or Offer

Ordinary shares sold on August 14, 2026 134,992 shares Securities Sold During The Past 3 Months; ordinary shares sold by Or Offer

Proceeds on August 14, 2026 sale 1,197,861.30 Securities Sold During The Past 3 Months; dollar value for 134,992 ordinary shares sold by Or Offer

Key Terms

Rule 144, Ordinary shares, employee stock options, cash payment upon exercise of stock options, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Ordinary shares financial

"Ordinary shares | Oppenheimer & Co. Inc."

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

employee stock options financial

"Shares acquired upon exercise of employee stock options"

Employee stock options are contracts that give workers the right to buy a company's shares at a set price sometime in the future, like a coupon that lets you purchase stock at today’s price later on. Investors care because they align employees’ incentives with company performance and create a potential future claim on shares that can reduce existing owners’ percentage and add to a company’s reported compensation costs.

cash payment upon exercise of stock options financial

"08/26/2026 | Cash payment upon exercise of stock options"

Securities Sold During The Past 3 Months regulatory

"144: Securities Sold During The Past 3 Months"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does the Form 144 filed in connection with SMWB disclose?

It discloses that Or Offer, an officer of SIMILARWEB LTD., has notified of an intent to sell ordinary shares under Rule 144, with the shares to be sold through Oppenheimer & Co. Inc. and acquired via cash exercise of employee stock options.

How will the SMWB shares covered by this Form 144 be acquired for sale?

The ordinary shares will be acquired upon exercise of employee stock options, with each block described as “Shares acquired upon exercise of employee stock options” and funded by cash payment upon exercise of stock options on August 26, 2026.

What SMWB share amounts are listed to be sold under this Form 144?

Four blocks of ordinary shares are listed in the “Securities To Be Sold” section with share amounts of 39,000, 140,008, 164,817, and 39,302, each scheduled as of August 26, 2026 and described as derived from employee stock option exercises.

What past SMWB share sales by Or Offer are disclosed in this filing?

The “Securities Sold During The Past 3 Months” section lists ordinary share sales by Or Offer of 574,605 shares for 5,057,419.85 on August 13, 2026 and 134,992 shares for 1,197,861.30 on August 14, 2026.

Is SIMILARWEB LTD. issuing new SMWB shares in this Form 144?

No. The Form 144 covers resales of ordinary shares for the account of Or Offer, obtained by exercising employee stock options. It is a notice of potential sales by an existing holder, not a registration of a new primary offering by SIMILARWEB LTD.

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

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Available on EDGAR 08/27/2026 - 06:44 AM EDT Accepted by SEC EDGAR 08/27/2026 - 06:44 AM EDT Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001910424
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	SIMILARWEB LTD.
SEC File Number	001-40394
Address of Issuer	33 Yitzhak Rabin Rd. Givatayim ISRAEL 5348303
Phone	972 (73) 320-4086
Name of Person for Whose Account the Securities are To Be Sold	Or Offer
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Ordinary shares	Oppenheimer & Co. Inc. 85 Broad St. New York NY 10004	383127	3421324.11	86962202	08/26/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Ordinary shares	08/26/2026	Shares acquired upon exercise of employee stock options	SIMILARWEB LTD.			39000	08/26/2026	Cash payment upon exercise of stock options
Ordinary shares	08/26/2026	Shares acquired upon exercise of employee stock options	SIMILARWEB LTD.			140008	08/26/2026	Cash payment upon exercise of stock options
Ordinary shares	08/26/2026	Shares acquired upon exercise of employee stock options	SIMILARWEB LTD.			164817	08/26/2026	Cash payment upon exercise of stock options
Ordinary shares	08/26/2026	Shares acquired upon exercise of employee stock options	SIMILARWEB LTD.			39302	08/26/2026	Cash payment upon exercise of stock options

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
Or Offer 33 Yitzhak Rabin Rd. Givatayim L3 5348303	Ordinary shares	08/13/2026	574605	5057419.85
Or Offer 33 Yitzhak Rabin Rd. Givatayim L3 5348303	Ordinary shares	08/14/2026	134992	1197861.30

144: Remarks and Signature

Remarks
Date of Notice	08/26/2026
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	Or Offer By: /s/ Meirav Shemesh Title: Authorized Signatory, Oppenheimer Israel (pursuant to delegation)
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)