Similarweb CEO sells 79,591 shares in Sept trades

SIMILARWEB LTD.’s CEO disclosed pre-planned open-market sales totaling 79,591 Ordinary Shares under a Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) reported that Chief Executive Officer Offer Or sold a total of 79,591 Ordinary Shares in open-market or private transactions on September 14 and 15, 2026. The sales were made under a Rule 10b5-1 trading plan adopted on June 1, 2026 and reported at weighted-average prices.

Insider Trade Summary 10b5-1

Net Seller: 79,591 shares

Net Sell 2 txns

Insider Offer Or

Role Chief Executive Officer

Sold 79,591 shs ($679K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F3	26,691	$8.5267	$228K
Sale	Ordinary Shares F1, F2	52,900	$8.5378	$452K

Holdings After Transaction: Ordinary Shares — 4,253,500 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 $8.07 to $8.70. 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 $8.32 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

Key Figures

Shares sold September 14, 2026: 52,900 shares Weighted-average price September 14, 2026: $8.5378 per share Shares sold September 15, 2026: 26,691 shares +2 more

5 metrics

Shares sold September 14, 2026 52,900 shares Ordinary Shares sold by CEO Offer Or

Weighted-average price September 14, 2026 $8.5378 per share Ordinary Shares sales, trades from $8.07 to $8.70

Shares sold September 15, 2026 26,691 shares Ordinary Shares sold by CEO Offer Or

Weighted-average price September 15, 2026 $8.5267 per share Ordinary Shares sales, trades from $8.32 to $8.70

Total shares sold 79,591 shares Sum of reported Ordinary Shares sales on September 14–15, 2026

Key Terms

Rule 10b5-1 trading plan, weighted average price, Ordinary Shares, open market or private transaction

4 terms

Rule 10b5-1 trading plan regulatory

"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan"

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 price reported is a weighted average price. These shares were sold"

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.

Ordinary Shares financial

"Ordinary Shares were sold in multiple transactions ranging from $8.07 to $8.70"

Ordinary shares are a type of ownership stake in a company, giving shareholders a right to participate in the company’s profits and decision-making through voting. They are similar to owning a piece of a business, and their value can rise or fall based on the company's performance. Investors buy ordinary shares to potentially earn dividends and benefit from the company's growth over time.

open market or private transaction financial

"Sale in open market or private transaction"

FAQ

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

What insider transaction did SMWB disclose in this Form 4?

SIMILARWEB LTD.’s CEO Offer Or sold 79,591 Ordinary Shares in aggregate on September 14 and 15, 2026 in open-market or private transactions, according to the Form 4.

How many SMWB shares did the CEO sell on each date?

On September 14, 2026, Offer Or sold 52,900 Ordinary Shares. On September 15, 2026, he sold an additional 26,691 Ordinary Shares, for a total of 79,591 shares.

At what prices were the SMWB shares sold by the CEO?

The September 14, 2026 sale was reported at a weighted-average price of $8.5378 per share, with individual trades between $8.07 and $8.70. The September 15, 2026 sale used a weighted-average price of $8.5267, with trades between $8.32 and $8.70.

Were the SMWB CEO’s sales made under a Rule 10b5-1 plan?

Yes. A footnote states that the sales reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted on June 1, 2026, and the Form 4’s Rule 10b5-1 checkbox is marked as affirmed.

Does the Form 4 show Offer Or’s SMWB share holdings after these sales?

No. For each reported transaction, the field for shares owned following the transaction is left blank, so this Form 4 does not state Offer Or’s remaining SMWB holdings.

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

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Available on EDGAR 09/16/2026 - 07:01 AM Accepted by SEC EDGAR 09/16/2026 - 07:01 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)
09/14/2026

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	09/14/2026		S(1)		52,900	D	$8.5378(2)	4,280,191	D
Ordinary Shares	09/15/2026		S(1)		26,691	D	$8.5267(3)	4,253,500	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 $8.07 to $8.70. 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 $8.32 to $8.70. 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	09/16/2026
	** 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)