Similarweb CEO sells 76,119 shares near $8.35

SIMILARWEB CEO Offer Or sold 76,119 Ordinary Shares in mid-September 2026 under a pre-arranged Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) reported that Chief Executive Officer Offer Or sold a total of 76,119 Ordinary Shares in open-market transactions on September 16 and 17, 2026 at weighted average prices of $8.3976 and $8.3460 per share, respectively. These sales were effectuated pursuant to a Rule 10b5-1 trading plan adopted on June 1, 2026, and the prices reflect weighted averages over multiple trades within stated price ranges.

Insider Trade Summary 10b5-1

Net Seller: 76,119 shares

Net Sell 2 txns

Insider Offer Or

Role Chief Executive Officer

Sold 76,119 shs ($638K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F3	30,400	$8.346	$254K
Sale	Ordinary Shares F1, F2	45,719	$8.3976	$384K

Holdings After Transaction: Ordinary Shares — 4,177,381 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 $8.235 to $8.76. 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 $8.19 to $8.50. 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 16, 2026: 45,719 shares Weighted average price September 16, 2026: $8.3976 per share Shares sold September 17, 2026: 30,400 shares +2 more

5 metrics

Shares sold September 16, 2026 45,719 shares Ordinary Shares sold by CEO Offer Or on September 16, 2026

Weighted average price September 16, 2026 $8.3976 per share Ordinary Shares sold in multiple transactions ranging from $8.235 to $8.76

Shares sold September 17, 2026 30,400 shares Ordinary Shares sold by CEO Offer Or on September 17, 2026

Weighted average price September 17, 2026 $8.3460 per share Ordinary Shares sold in multiple transactions ranging from $8.19 to $8.50

Total shares sold 76,119 shares Aggregate Ordinary Shares sold across both reported transactions

Key Terms

Rule 10b5-1 trading plan, weighted average price, Ordinary Shares

3 terms

Rule 10b5-1 trading plan regulatory

"The sale reported ... 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, transaction date September 16, 2026"

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.

FAQ

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

What insider transactions did SIMILARWEB (SMWB) disclose for its CEO Offer Or?

SIMILARWEB disclosed that CEO Offer Or sold a total of 76,119 Ordinary Shares on September 16 and 17, 2026 in open-market transactions, at weighted average prices of $8.3976 and $8.3460 per share, respectively, under a Rule 10b5-1 trading plan.

How many SIMILARWEB (SMWB) shares did the CEO sell on September 16, 2026?

On September 16, 2026, CEO Offer Or sold 45,719 Ordinary Shares of SIMILARWEB at a weighted average price of $8.3976 per share, in multiple transactions with individual prices ranging from $8.235 to $8.76.

How many SIMILARWEB (SMWB) shares did the CEO sell on September 17, 2026?

On September 17, 2026, CEO Offer Or sold 30,400 Ordinary Shares of SIMILARWEB at a weighted average price of $8.3460 per share, in multiple transactions with individual prices ranging from $8.19 to $8.50.

Were the recent SIMILARWEB (SMWB) insider sales made under a Rule 10b5-1 plan?

Yes. The filing states that the sales reported were effectuated pursuant to a Rule 10b5-1 trading plan adopted by CEO Offer Or on June 1, 2026, and the document-level Rule 10b5-1 checkbox is marked as affirmed.

What is the total number of SIMILARWEB (SMWB) shares sold by the CEO in this Form 4?

Across both reported transactions, CEO Offer Or sold a total of 76,119 Ordinary Shares of SIMILARWEB, consisting of 45,719 shares on September 16, 2026 and 30,400 shares on September 17, 2026.

How were the sale prices for SIMILARWEB (SMWB) CEO’s transactions reported?

For each date, the price disclosed is a weighted average price. On September 16, 2026, trades ranged from $8.235 to $8.76; on September 17, 2026, trades ranged from $8.19 to $8.50. The reporting person will provide detailed per-trade prices upon request.

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

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Available on EDGAR 09/18/2026 - 06:14 AM Accepted by SEC EDGAR 09/18/2026 - 06:13 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)
09/16/2026

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	09/16/2026		S(1)		45,719	D	$8.3976(2)	4,207,781	D
Ordinary Shares	09/17/2026		S(1)		30,400	D	$8.346(3)	4,177,381	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 $8.235 to $8.76. 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 $8.19 to $8.50. 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	09/18/2026
	** 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)