Similarweb (NYSE: SMWB) director discloses RSU and ordinary share holdings

Rhea-AI Filing Summary

SIMILARWEB LTD. director Lisa M. Campbell filed an initial ownership report showing her equity stake in the company. She holds 20,877 restricted share units, each representing one ordinary share, and 5,219 ordinary shares directly. The RSUs vest in three equal annual installments over a 3-year period, with the first vesting date on 11/15/2025, subject to her continued service with Similarweb or its subsidiaries through each vesting date.

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^*

Campbell Lisa M

(Last) (First) (Middle)

C/O DROPBOX, INC.

1800 OWENS STREET

(Street)

SAN FRANCISCO CALIFORNIA 94158

(City) (State) (Zip)

UNITED STATES

(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)
Restricted Share Units, each representing one Ordinary Share	20,877(1)	D
Ordinary Shares	5,219	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

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 3 years period equal installments with the first vesting date on 11/15/2025 subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date.

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.

	Lisa Campbell 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 Similarweb (SMWB) director Lisa M. Campbell report on this Form 3?

Lisa M. Campbell reports her initial equity holdings in Similarweb. She directly holds 20,877 restricted share units, each representing one ordinary share, and 5,219 ordinary shares. This filing establishes her starting ownership position as a director of the company.

How many restricted share units does Lisa M. Campbell hold in Similarweb (SMWB)?

She holds 20,877 restricted share units in Similarweb. Each RSU represents a contingent right to receive one ordinary share, subject to vesting conditions and her continued service with the company or its subsidiaries through specified vesting dates.

What are the vesting terms of Lisa M. Campbell’s RSUs in Similarweb (SMWB)?

Her restricted share units vest in three equal annual installments over a 3-year period. The first vesting date is 11/15/2025, and each installment requires her continued service to Similarweb or its subsidiaries through the applicable vesting date.

How many Similarweb (SMWB) ordinary shares does Lisa M. Campbell directly own?

She directly owns 5,219 ordinary shares of Similarweb. This holding is reported separately from her 20,877 restricted share units, which only convert into ordinary shares as they vest according to the stated schedule and service conditions.

Do Lisa M. Campbell’s RSUs in Similarweb (SMWB) provide immediate ownership of shares?

The RSUs do not provide immediate share ownership. Each restricted share unit represents a contingent right to receive one ordinary share, which is realized only as the units vest over three years, subject to her continued service with the company.