Similarweb CEO sells 69,700 shares in plan trades

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) reported that its Chief Executive Officer, Offer Or, sold a total of 69,700 Ordinary Shares in two transactions under a Rule 10b5-1 trading plan adopted on June 1, 2026. The sales on September 18 and September 21, 2026 were executed at weighted average prices with no post-transaction share balance reported.

Insider Trade Summary 10b5-1

Net Seller: 69,700 shares

Net Sell 2 txns

Insider Offer Or

Role Chief Executive Officer

Sold 69,700 shs ($580K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F3	32,200	$8.404	$271K
Sale	Ordinary Shares F1, F2	37,500	$8.2476	$309K

Holdings After Transaction: Ordinary Shares — 4,107,681 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 $8.10 to $8.345. 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 $8.29 to $8.48. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

Key Figures

Total shares sold: 69,700 Ordinary Shares Shares sold on September 18, 2026: 37,500 Ordinary Shares Weighted average price on September 18, 2026: $8.2476 per share +3 more

6 metrics

Total shares sold 69,700 Ordinary Shares Aggregate of CEO Offer Or’s reported sales in September 2026

Shares sold on September 18, 2026 37,500 Ordinary Shares Sale by Offer Or at a weighted average price of $8.2476

Weighted average price on September 18, 2026 $8.2476 per share Multiple transactions ranging from $8.10 to $8.345

Shares sold on September 21, 2026 32,200 Ordinary Shares Sale by Offer Or at a weighted average price of $8.4040

Weighted average price on September 21, 2026 $8.4040 per share Multiple transactions ranging from $8.29 to $8.48

Rule 10b5-1 plan adoption date June 1, 2026 Date Offer Or adopted the trading plan governing these sales

Key Terms

Rule 10b5-1 trading plan, weighted average price, multiple transactions

3 terms

Rule 10b5-1 trading plan regulatory

"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"

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 in multiple transactions ranging from $8.10 to $8.345."

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.

multiple transactions financial

"These shares were sold in multiple transactions ranging from $8.29 to $8.48."

FAQ

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

What insider transaction did SMWB disclose in this Form 4?

The filing reports that SIMILARWEB LTD. Chief Executive Officer Offer Or sold a total of 69,700 Ordinary Shares in two transactions in September 2026, executed under a Rule 10b5-1 trading plan adopted on June 1, 2026.

How many SIMILARWEB (SMWB) shares did the CEO sell on September 18, 2026?

On September 18, 2026, Offer Or sold 37,500 Ordinary Shares of SIMILARWEB LTD. at a weighted average price of $8.2476 per share. A footnote states these shares were sold in multiple transactions ranging from $8.10 to $8.345.

How many SIMILARWEB (SMWB) shares did the CEO sell on September 21, 2026?

On September 21, 2026, Offer Or sold 32,200 Ordinary Shares of SIMILARWEB LTD. at a weighted average price of $8.4040 per share, with individual sale prices ranging from $8.29 to $8.48 according to the filing footnote.

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

Yes. The filing states that the reported sales were effectuated pursuant to a Rule 10b5-1 trading plan adopted by Offer Or on June 1, 2026, indicating the transactions were pre-arranged under that plan.

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

Across both reported transactions, Offer Or sold a total of 69,700 Ordinary Shares of SIMILARWEB LTD., consisting of 37,500 shares sold on September 18, 2026 and 32,200 shares sold on September 21, 2026.

Does the Form 4 show how many SIMILARWEB (SMWB) shares the CEO holds after these sales?

No. The reported transactions list the number of shares sold and the weighted average prices, but they do not state a post-transaction Ordinary Share balance for Offer Or.

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

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Available on EDGAR 09/22/2026 - 07:43 AM Accepted by SEC EDGAR 09/22/2026 - 07:43 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)
09/18/2026

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	09/18/2026		S(1)		37,500	D	$8.2476(2)	4,139,881	D
Ordinary Shares	09/21/2026		S(1)		32,200	D	$8.404(3)	4,107,681	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 $8.10 to $8.345. 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 $8.29 to $8.48. 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	09/22/2026
	** 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)