Similarweb CEO sells 147K shares around $8

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) reported that Chief Executive Officer Offer Or sold a total of 147,000 ordinary shares in two open-market transactions on September 8 and 9, 2026 under a Rule 10b5-1 trading plan adopted on June 1, 2026, at weighted average prices around $8 per share.

Insider Trade Summary 10b5-1

Net Seller: 147,000 shares

Net Sell 2 txns

Insider Offer Or

Role Chief Executive Officer

Sold 147,000 shs ($1.20M)

Type	Security	Shares	Price	Value
Sale	Ordinary shares F1, F3	86,300	$8.0568	$695K
Sale	Ordinary shares F1, F2	60,700	$8.3295	$506K

Holdings After Transaction: Ordinary shares — 4,451,291 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 $8.24 to $8.56. 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 $8.00 to $8.22. 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 8, 2026: 60,700 shares Weighted average price September 8, 2026: $8.3295 per share Shares sold September 9, 2026: 86,300 shares +2 more

5 metrics

Shares sold September 8, 2026 60,700 shares Ordinary shares sold by CEO Offer Or on September 8, 2026

Weighted average price September 8, 2026 $8.3295 per share Sales of 60,700 ordinary shares, with trades from $8.24 to $8.56

Shares sold September 9, 2026 86,300 shares Ordinary shares sold by CEO Offer Or on September 9, 2026

Weighted average price September 9, 2026 $8.0568 per share Sales of 86,300 ordinary shares, with trades from $8.00 to $8.22

Total shares sold 147,000 shares Combined ordinary share sales reported in this Form 4

Key Terms

Rule 10b5-1 trading plan, weighted average price

2 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"

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

What insider transaction did SIMILARWEB (SMWB) disclose in this Form 4?

SIMILARWEB disclosed that CEO Offer Or sold 147,000 ordinary shares in the open market on September 8 and 9, 2026, at weighted average prices of about $8 per share, pursuant to a Rule 10b5-1 trading plan.

How many SMWB shares did the CEO sell on September 8, 2026 and at what price?

On September 8, 2026, CEO Offer Or sold 60,700 ordinary shares of SMWB at a weighted average price of $8.3295 per share, with individual trades executed between $8.24 and $8.56.

How many SMWB shares did the CEO sell on September 9, 2026 and at what price?

On September 9, 2026, CEO Offer Or sold 86,300 ordinary shares of SMWB at a weighted average price of $8.0568 per share, with individual trades executed between $8.00 and $8.22.

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

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

What is the total number of SMWB shares sold by the CEO in this filing?

Across both reported transactions, CEO Offer Or sold a total of 147,000 ordinary shares of SIMILARWEB LTD., combining 60,700 shares sold on September 8, 2026 and 86,300 shares sold on September 9, 2026.

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Available on EDGAR 09/10/2026 - 09:29 AM Accepted by SEC EDGAR 09/10/2026 - 09:28 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)
09/08/2026

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	09/08/2026		S(1)		60,700	D	$8.3295(2)	4,537,591	D
Ordinary shares	09/09/2026		S(1)		86,300	D	$8.0568(3)	4,451,291	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 $8.24 to $8.56. 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 $8.00 to $8.22. 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	09/10/2026
	** 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)