Similarweb (NYSE: SMWB) CEO details share, RSU and option holdings

Rhea-AI Filing Summary

SIMILARWEB LTD. Chief Executive Officer Offer Or has filed an initial Form 3 detailing his equity holdings in the company. He directly owns 3,647,291 ordinary shares and holds multiple restricted share unit (RSU) awards that each convert into ordinary shares over time, subject to continued service.

He also holds stock options to purchase ordinary shares at exercise prices ranging from $0.40 to $3.04 per share, with expiration dates between 2028 and 2031. The RSUs generally vest 25% after one year, then in 12 equal quarterly installments beginning on specified dates, provided he remains with Similarweb or its subsidiaries.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person^*

Offer Or

(Last) (First) (Middle)

87 HAZOREA ST.

(Street)

KFAR SHMARYAHU

(City) (State) (Zip)

ISRAEL

(Country)

2. Date of Event Requiring Statement (Month/Day/Year)
03/26/2026

3. Issuer Name and Ticker or Trading Symbol
SIMILARWEB LTD. [ SMWB ]

3a. Foreign Trading Symbol

5. If Amendment, Date of Original Filed (Month/Day/Year)

4. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Chief Executive Officer

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Ordinary shares	3,647,291	D
Restricted Share Units, each representing one Ordinary Share	47,500(1)	D
Restricted Share Units, each representing one Ordinary Share	47,500(2)	D
Restricted Share Units, each representing one Ordinary Share	98,000(3)	D
Restricted Share Units, each representing one Ordinary Share	98,000(4)	D
Restricted Share Units, each representing one Ordinary Share	150,000(5)	D
Restricted Share Units, each representing one Ordinary Share	150,000(6)	D
Restricted Share Units, each representing one Ordinary Share	200,000(7)	D
Restricted Share Units, each representing one Ordinary Share	200,000(8)	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Options to purchase one Ordinary Share	02/14/2015(9)	02/14/2028	Ordinary shares, par value NIS 0.01 per share	1,014,000	$0.4	D
Options to purchase one Ordinary Share	11/20/2019(9)	11/19/2028	Ordinary shares, par value NIS 0.01 per share	439,302	$2.71	D
Options to purchase one Ordinary Share	11/20/2020(9)	11/19/2028	Ordinary shares, par value NIS 0.01 per share	564,817	$2.71	D
Options to purchase one Ordinary Share	01/29/2022(9)	01/28/2031	Ordinary shares, par value NIS 0.01 per share	428,500	$3.04	D

Explanation of Responses:

1. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2024, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

2. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2024, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

3. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2025, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

4. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2025, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

5. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2026, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

6. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2026, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

7. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2027, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

8. The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 25% after one year period & 12 equal installments every quarter afterwards with the first vesting date on 02/15/2027, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

9. The Options are fully vested & immediately exercisable.

Remarks:

This Form 3 has been filed after March 18,2026 but prior to April 20,2026 in reliance on the temporary relief made available to the directors and officers of certain foreign private issuers by the Staff of the Securities and Exchange Commission in its no action letter dated March 13,2026.

	Or Offer by: Oppenheimer Israel, as Attorney-in-fact	03/26/2026
	** Signature of Reporting Person	Date
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 5 (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 3: SEC 1473 (03-26)

FAQ

What does Offer Or’s Form 3 filing for Similarweb (SMWB) show?

The Form 3 shows Offer Or’s initial beneficial ownership in Similarweb, including 3,647,291 directly held ordinary shares plus multiple RSU and stock option awards. It establishes his baseline equity position as Chief Executive Officer at the time of the filing.

How many Similarweb (SMWB) ordinary shares does Offer Or hold directly?

Offer Or directly holds 3,647,291 Similarweb ordinary shares, according to the Form 3 data. This direct ownership is separate from his restricted share units and stock options, which represent additional contingent or exercisable rights to acquire ordinary shares over time.

What stock options does the Similarweb (SMWB) CEO hold under this Form 3?

The CEO holds several option grants to purchase Similarweb ordinary shares at exercise prices of $0.40, $2.71 and $3.04 per share. These options have expiration dates ranging from February 2028 through January 2031, providing long-dated potential share acquisition rights.

How do Offer Or’s Similarweb (SMWB) RSUs vest over time?

The RSUs each represent one Similarweb ordinary share and generally vest 25% after one year, then in 12 equal quarterly installments. Vesting schedules begin on dates such as February 15, 2024, 2025, 2026 and 2027, conditioned on Offer Or’s continued service with the company.

Does Offer Or’s Similarweb (SMWB) Form 3 show any share purchases or sales?

The data reflects holdings entries and does not show any recorded buy or sell transactions for this period. It is an initial ownership statement listing existing ordinary shares, RSU awards and stock options rather than reporting new market trades or option exercises.