Similarweb CEO sells 118K shares in plan trades

Similarweb’s CEO reported two Rule 10b5-1 plan sales totaling 118,200 ordinary shares over two days in September 2026.

Rhea-AI Filing Summary

SIMILARWEB LTD. (SMWB) reported that Chief Executive Officer Offer Or sold a total of 118,200 Ordinary Shares in open-market transactions under a pre-arranged Rule 10b5-1 trading plan adopted on June 1, 2026. The sales on September 10 and 11, 2026 were executed at weighted average prices with specified intra-day price ranges.

Insider Trade Summary 10b5-1

Net Seller: 118,200 shares

Net Sell 2 txns

Insider Offer Or

Role Chief Executive Officer

Sold 118,200 shs ($952K)

Type	Security	Shares	Price	Value
Sale	Ordinary Shares F1, F3	59,000	$8.0493	$475K
Sale	Ordinary Shares F1, F2	59,200	$8.0631	$477K

Holdings After Transaction: Ordinary Shares — 4,333,091 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 $7.89 to $8.18. 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 $7.94 to $8.12. 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: 118,200 shares Shares sold on September 10, 2026: 59,200 shares Weighted average price on September 10, 2026: $8.0631 per share +3 more

6 metrics

Total shares sold 118,200 shares Aggregate open-market sales reported for September 10–11, 2026

Shares sold on September 10, 2026 59,200 shares Ordinary Shares sold in open-market or private transactions

Weighted average price on September 10, 2026 $8.0631 per share Multiple transactions ranging from $7.89 to $8.18

Shares sold on September 11, 2026 59,000 shares Ordinary Shares sold in open-market or private transactions

Weighted average price on September 11, 2026 $8.0493 per share Multiple transactions ranging from $7.94 to $8.12

Rule 10b5-1 plan adoption date June 1, 2026 Date CEO’s trading plan governing these sales was adopted

Key Terms

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

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"

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.

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 transactions did SMWB report for its CEO Offer Or?

Offer Or reported two open-market sales of Similarweb Ltd. Ordinary Shares, totaling 118,200 shares, executed on September 10 and 11, 2026, according to the Form 4 filing.

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

On September 10, 2026, Offer Or sold 59,200 shares. On September 11, 2026, he sold 59,000 shares. Both transactions involved Ordinary Shares of Similarweb Ltd.

At what prices were the SMWB CEO’s shares sold?

The September 10, 2026 sale had a weighted average price of $8.0631 per share, from $7.89 to $8.18. The September 11, 2026 sale had a weighted average price of $8.0493, from $7.94 to $8.12, with details available on request.

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

Yes. The filing states the sales were made pursuant to a Rule 10b5-1 trading plan adopted by Offer Or on June 1, 2026, and the Form 4’s 10b5-1 checkbox is affirmed.

Does the Form 4 show Offer Or’s remaining SMWB share holdings?

No. For these two reported transactions, the Form 4 does not state total shares held following the transactions, so only the shares sold and their pricing details are available.

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 09/14/2026 - 09:08 AM Accepted by SEC EDGAR 09/14/2026 - 09:07 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)
09/10/2026

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	09/10/2026		S(1)		59,200	D	$8.0631(2)	4,392,091	D
Ordinary Shares	09/11/2026		S(1)		59,000	D	$8.0493(3)	4,333,091	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 $7.89 to $8.18. 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 $7.94 to $8.12. 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	09/14/2026
	** 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)