[144] Similarweb Ltd. SEC Filing

Rhea-AI Filing Summary

Similarweb Ltd. filed a Form 144 reporting a proposed sale of 801,433 ordinary shares through Oppenheimer & Co. Inc. on the NYSE, with an aggregate market value of $6,756,080.19. The filing lists 82,618,511 shares outstanding, and the approximate date of sale is 08/14/2025.

The securities were reported as acquired under the issuer's employee stock options plan on four dates with the following quantities: 10/13/2015: 528,920, 04/19/2017: 67,278, 07/26/2017: 105,238, and 05/07/2019: 100,000. Payment is listed as cash upon exercise on 08/14/2025. The filer represents there is no material nonpublic information and reports nothing to report for securities sold during the past three months.

Positive

• Full disclosure of number of shares to be sold and the aggregate market value
• Acquisition details provided for each lot, showing securities originated from employee stock option plan

Negative

• Planned sale of 801,433 shares valued at $6,756,080.19 may increase available supply in the market
• No information in the filing to explain any intent or reason for the sale beyond exercise and sale mechanics

Insights

Securities Analyst

TL;DR: Routine Form 144 discloses a planned sale of 801,433 shares valued at $6.76M; size is notable but impact depends on market context.

The filing clearly states the number of shares to be sold, the aggregate market value, the broker (Oppenheimer & Co.), and the approximate sale date of 08/14/2025. All shares were acquired via the issuer's employee stock options plan and will be paid in cash upon exercise. The filing notes no securities sold in the past three months and includes the standard attestation regarding material nonpublic information. Based on the disclosed facts alone, this is a routine insider sale notice; its materiality for investors cannot be determined from the filing by itself.

Corporate Governance Expert

TL;DR: Disclosure shows option-origin shares are being exercised and offered for sale, with the filer affirming no undisclosed material information.

The document identifies the acquisition source as the companys employee stock options plan across four acquisition dates and provides exact share counts for each grant. The inclusion of the attestation about material adverse information and the note on Rule 10b5-1 plans are standard governance controls for insider sales. From a governance perspective, the filing meets disclosure requirements and documents provenance of the shares, which aids transparency for stakeholders.

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

144: Issuer Information

Name of Issuer

SEC File Number

Address of Issuer

Phone

Name of Person for Whose Account the Securities are To Be Sold

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

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	Oppenheimer & Co. Inc. 85 Broad St. New York NY 10004	801433	6756080.19	82618511	08/14/2025	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	10/13/2015	Employee stock Options plan	Issuer			528920	08/14/2025	Cash - Upon Exercise
Ordinary	04/19/2017	Employee stock Options plan	Issuer			67278	08/14/2025	Cash - Upon Exercise
Ordinary	07/26/2017	Employee stock Options plan	Issuer			105238	08/14/2025	Cash - Upon Exercise
Ordinary	05/07/2019	Employee stock Options plan	Issuer			100000	08/14/2025	Cash - Upon Exercise

* 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

Nothing to Report

144: Remarks and Signature

Remarks

Date of Notice

Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1

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

ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)

FAQ

What did Similarweb (SMWB) file in this Form 144?

The company filed notice of a proposed sale of 801,433 ordinary shares on the NYSE through Oppenheimer, with aggregate market value $6,756,080.19.

When is the Approximate Date of Sale listed on Similarweb's Form 144?

The filing lists the approximate date of sale as 08/14/2025.

How were the shares to be sold acquired according to the filing?

All reported shares were acquired under the issuer's employee stock options plan on dates in 2015, 2017, and 2019, and will be paid in cash upon exercise.

Does the filing report any securities sold by the filer in the past three months?

No. The Form 144 states Nothing to Report for securities sold during the past three months.

What attestation does the filer make in the Form 144?

The filer represents by signing the notice that they do not know any material adverse information about the issuer that has not been publicly disclosed.