Similarweb CEO sells 34,500, then 28,400 shares

Similarweb’s chief executive officer made both reported sales under a Rule 10b5-1 trading plan adopted on June 1, 2026.

Rhea-AI Filing Summary

Similarweb Ltd.’s Chief Executive Officer, Offer Or, reported selling 34,500 ordinary shares on September 22, 2026, at a weighted average price of $8.3778 per share, and 28,400 ordinary shares on September 23, 2026, at a weighted average price of $8.5353 per share. Both sales were made pursuant to a Rule 10b5-1 trading plan adopted on June 1, 2026.

Insider Trade Summary 10b5-1

Net Seller: 62,900 shares

Net Sell 2 txns

Insider Offer Or

Role Chief Executive Officer

Sold 62,900 shs ($531K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F3	28,400	$8.5353	$242K
Sale	Ordinary Shares F1, F2	34,500	$8.3778	$289K

Holdings After Transaction: Ordinary Shares — 4,044,781 shares (Direct)

Footnotes (3)

1. F1. The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026
2. F2. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.22 to $8.50. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
3. F3. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.37 to $8.61. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

Key Figures

Shares sold: 34,500 ordinary shares Weighted average sale price: $8.3778 per share Shares sold: 28,400 ordinary shares +1 more

4 metrics

Shares sold 34,500 ordinary shares Sale on September 22, 2026

Weighted average sale price $8.3778 per share Sale on September 22, 2026

Shares sold 28,400 ordinary shares Sale on September 23, 2026

Weighted average sale price $8.5353 per share Sale on September 23, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average price

2 terms

Rule 10b5-1 trading plan regulatory

"the CEO’s sales reported for September 22 and September 23, 2026"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

weighted average price financial

"the reported price for the September 22, 2026 sale"

Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.

FAQ

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

What price ranges applied to the SMWB CEO’s reported share sales?

The September 22, 2026 sale involved multiple transactions priced from $8.22 to $8.50 per share, and the September 23, 2026 sale involved multiple transactions priced from $8.37 to $8.61 per share.

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

Form 4 Insider Transactions: What Each Field Means →

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Available on EDGAR 09/24/2026 - 09:01 AM Accepted by SEC EDGAR 09/24/2026 - 07:56 AM Learn about SEC filing dates

SEC Form 4

FORM 4

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

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

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

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

X

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Offer Or

(Last) (First) (Middle)

87 HAZOREA ST.

(Street)

KFAR SHMARYAHU

(City) (State) (Zip)

ISRAEL

(Country)

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

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/22/2026

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

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

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

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Ordinary Shares	09/22/2026		S(1)		34,500	D	$8.3778(2)	4,073,181	D
Ordinary Shares	09/23/2026		S(1)		28,400	D	$8.5353(3)	4,044,781	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026

2. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.22 to $8.50. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

3. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.37 to $8.61. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

	/s/ Meirav Shemesh on behalf of Oppenheimer Israel, as Attorney-in-fact	09/24/2026
	** 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 4 (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 4: SEC 1474 (03-26)