Similarweb (NYSE: SMWB) director discloses shares, options and RSU grants

Rhea-AI Filing Summary

SIMILARWEB LTD. director Benjamin Seror filed an initial ownership report detailing his equity position in the company. He directly holds 316,250 ordinary shares and two fully vested option grants covering 18,750 and 231,250 underlying ordinary shares, with exercise prices of 2.3800 and 3.0400 and expirations in November 2030 and January 2031. He also holds several restricted share unit (RSU) awards representing 18,750, 40,000, 60,000 and 80,000 ordinary shares, each vesting 25% after one year and the remainder in 12 quarterly installments starting on 02/15/2024, 02/15/2025, 02/15/2026 and 02/15/2027, subject to his continued service.

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^*

Seror Benjamin

(Last) (First) (Middle)

C/O 33 YITZHAK RABIN RD.

(Street)

GIVATAYIM

(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)

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

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	316,250	D
Restricted Share Units, each representing one Ordinary Share	18,750(1)	D
Restricted Share Units, each representing one Ordinary Share	40,000(2)	D
Restricted Share Units, each representing one Ordinary Share	60,000(3)	D
Restricted Share Units, each representing one Ordinary Share	80,000(4)	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	11/09/2021(5)	11/08/2030	Ordinary shares, par value NIS 0.01 per share	18,750	$2.38	D
Options to purchase one Ordinary Share	01/29/2021(5)	01/28/2031	Ordinary shares, par value NIS 0.01 per share	231,250	$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 02/15/2025, 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 02/15/2026, 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 02/15/2027, subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

5. 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.

	Benjamin Seror 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 the Form 3 filing for Similarweb (SMWB) disclose about Benjamin Seror?

The Form 3 shows that director Benjamin Seror reported his initial ownership in Similarweb, including 316,250 ordinary shares, fully vested options over additional shares, and several RSU grants that vest over time, subject to his continued service with the company.

How many Similarweb (SMWB) ordinary shares does Benjamin Seror directly hold?

Benjamin Seror directly holds 316,250 ordinary shares of Similarweb. This figure reflects his reported common equity position, separate from his options and restricted share units, and represents the shares he currently owns outright according to the Form 3 disclosure.

What option awards did Benjamin Seror report in his Similarweb (SMWB) Form 3?

He reported fully vested options to purchase 18,750 ordinary shares at an exercise price of 2.3800 and options over 231,250 ordinary shares at 3.0400, with expirations in November 2030 and January 2031, respectively, all held directly.

What RSU grants for Similarweb (SMWB) did Benjamin Seror disclose?

He disclosed RSU awards representing 18,750, 40,000, 60,000 and 80,000 ordinary shares. Each grant vests 25% after one year and then in 12 quarterly installments, starting on 02/15/2024, 02/15/2025, 02/15/2026 and 02/15/2027, subject to continued service.

Do Benjamin Seror’s options in Similarweb (SMWB) vest immediately?

Yes. The filing notes that his options are fully vested and immediately exercisable. This means he can choose to exercise them at their stated exercise prices any time before their respective expiration dates, based on his own decisions and circumstances.

Are Benjamin Seror’s Similarweb (SMWB) RSUs subject to continued service?

Yes. Each RSU grant vests only if he maintains continued service with Similarweb or its subsidiaries through each vesting date. If service ends earlier, unvested RSUs would typically not settle into ordinary shares under the terms described.