Similarweb CEO sells 709K shares after option exercise

Rhea-AI Filing Summary

SIMILARWEB LTD. Chief Executive Officer Offer Or reported multiple transactions in the company’s Ordinary Shares on August 13–14, 2026. He exercised options covering 563,492 Ordinary Shares at exercise prices of $0.40 and $3.04 per share, and the underlying shares were acquired and then sold on the same dates.

Across these transactions, he sold a total of 709,597 Ordinary Shares in market sales at weighted average prices generally in the $8.66–$9.005 range, according to the price footnotes. The filing does not state his resulting share ownership after these transactions.

Insider Trade Summary

Exercise and sale activity reported; no spread calculated

Exercise and Sale 14 txns

Insider Offer Or

Role Chief Executive Officer

Sold 709,597 shs ($6.26M)

Approx. gross sale proceeds $6.26M

Approx. exercise cost $987K

Type	Security	Shares	Price	Value
Exercise	Options to purchase one Ordinary Share F5	59,992	$0.00	$0.00
Exercise	Options to purchase one Ordinary Share F5	75,000	$0.00	$0.00
Exercise	Ordinary Shares F6	59,992	$3.04	$182K
Sale	Ordinary Shares F3	59,992	$8.9006	$534K
Exercise	Ordinary Shares F6	75,000	$0.40	$30K
Sale	Ordinary Shares F4	75,000	$8.852	$664K
Exercise	Options to purchase one Ordinary Share F5	228,500	$0.00	$0.00
Exercise	Options to purchase one Ordinary Share F5	200,000	$0.00	$0.00
Exercise	Ordinary Shares F6	228,500	$3.04	$695K
Sale	Ordinary Shares F1	228,500	$8.8215	$2.02M
Exercise	Ordinary Shares F6	200,000	$0.40	$80K
Sale	Ordinary Shares F2	200,000	$8.7864	$1.76M
Sale	Ordinary Shares	106,105	$8.75	$928K
Sale	Ordinary Shares	40,000	$8.90	$356K

Holdings After Transaction: Options to purchase one Ordinary Share — 879,008 contracts (Direct); Ordinary Shares — 4,598,291 shares (Direct)

Footnotes (6)

1. F1. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.66 to $9.005. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
2. F2. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.69 to $8.88. 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 $8.90 to $8.92. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
4. F4. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.85 to $8.87. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request
5. F5. The options reported herein were exercised and the underlying shares were sold on the same date as reported in Table I.
6. F6. The shares were acquired upon the exercise of stock options

Key Figures

Total shares sold: 709,597 shares Options exercised (underlying shares): 563,492 shares Exercise price: $0.40 per share +4 more

7 metrics

Total shares sold 709,597 shares Aggregate Ordinary Shares sold by Offer Or per transactionSummary

Options exercised (underlying shares) 563,492 shares Total underlying Ordinary Shares from option exercises (M code) per transactionSummary

Exercise price $0.40 per share Exercise price on certain options to purchase one Ordinary Share

Exercise price $3.04 per share Exercise price on another set of options to purchase one Ordinary Share

Weighted average sale price $8.8215 per share Weighted average price for 228,500-share sale on 2026-08-13 (footnote F1)

Weighted average sale price $8.7864 per share Weighted average price for 200,000-share sale on 2026-08-13 (footnote F2)

Sale price $8.9000 per share Price for 40,000-share sale on 2026-08-13 without footnote qualification

Key Terms

weighted average price, Exercise or conversion of derivative security, Options to purchase one Ordinary Share, Ordinary Shares

4 terms

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.

Exercise or conversion of derivative security financial

"transaction_code_description":"Exercise or conversion of derivative security""

Options to purchase one Ordinary Share financial

"security_title":"Options to purchase one Ordinary Share""

Ordinary Shares financial

"security_title":"Ordinary Shares""

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 did SIMILARWEB (SMWB) CEO Offer Or report in this Form 4?

Offer Or reported option exercises and related share sales on August 13–14, 2026. He exercised options for 563,492 Ordinary Shares and then sold 709,597 shares in market transactions at various weighted average prices disclosed in the filing.

How many SIMILARWEB (SMWB) shares did the CEO sell in this Form 4?

The CEO sold a total of 709,597 Ordinary Shares. These were executed in multiple market transactions over August 13–14, 2026, at weighted average prices detailed in the footnotes, with trade price ranges broadly between $8.66 and $9.005 per share.

What options did the SIMILARWEB (SMWB) CEO exercise in this Form 4?

Offer Or exercised options over 563,492 Ordinary Shares, consisting of options at exercise prices of $0.40 and $3.04 per share. The footnotes state the options were exercised and the underlying shares were sold on the same dates as the reported stock sales.

What prices were reported for the SIMILARWEB (SMWB) CEO’s share sales?

Reported per-share prices include weighted averages such as $8.8215, $8.7864, $8.9006, and $8.8520. Footnotes clarify these are weighted average prices from multiple trades within ranges like $8.66–$9.005, with exact breakdowns available on request.

Does this SIMILARWEB (SMWB) Form 4 indicate trading under a Rule 10b5-1 plan?

The filing’s Rule 10b5‑1 checkbox is not marked as affirmative, and the footnotes do not mention any trading plan. The disclosure therefore only confirms the reported option exercises and share sales, without describing them as executed under a pre-arranged plan.

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

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Accepted by SEC EDGAR 08/17/2026 - 08:38 AM EDT 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).

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)
08/13/2026

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	08/13/2026		M		228,500(6)	A	$3.04	4,972,896	D
Ordinary Shares	08/13/2026		S		228,500	D	$8.8215(1)	4,744,396	D
Ordinary Shares	08/13/2026		M		200,000(6)	A	$0.4	4,944,396	D
Ordinary Shares	08/13/2026		S		200,000	D	$8.7864(2)	4,744,396	D
Ordinary Shares	08/13/2026		S		106,105	D	$8.75	4,638,291	D
Ordinary Shares	08/13/2026		S		40,000	D	$8.9	4,598,291	D
Ordinary Shares	08/14/2026		M		59,992(6)	A	$3.04	4,658,283	D
Ordinary Shares	08/14/2026		S		59,992	D	$8.9006(3)	4,598,291	D
Ordinary Shares	08/14/2026		M		75,000(6)	A	$0.4	4,673,291	D
Ordinary Shares	08/14/2026		S		75,000	D	$8.852(4)	4,598,291	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
Options to purchase one Ordinary Share	$3.04	08/13/2026		M(5)			228,500	01/29/2022	01/28/2031	Ordinary shares	228,500	$0	200,000	D
Options to purchase one Ordinary Share	$0.4	08/13/2026		M(5)			200,000	02/14/2015	02/14/2028	Ordinary shares	200,000	$0	814,000	D
Options to purchase one Ordinary Share	$3.04	08/14/2026		M(5)			59,992	01/29/2022	01/28/2031	Ordinary shares	59,992	$0	140,008	D
Options to purchase one Ordinary Share	$0.4	08/14/2026		M(5)			75,000	02/14/2015	02/14/2028	Ordinary shares	75,000	$0	739,000	D

Explanation of Responses:

1. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.66 to $9.005. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

2. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.69 to $8.88. 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 $8.90 to $8.92. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

4. The price reported is a weighted average price. These shares were sold in multiple transactions ranging from $8.85 to $8.87. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request

5. The options reported herein were exercised and the underlying shares were sold on the same date as reported in Table I.

6. The shares were acquired upon the exercise of stock options

	/s/ Meirav Shemesh on behalf of Oppenheimer Israel, as Attorney-in-fact	08/17/2026
	** 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)