OFFER OR (Chief Executive Officer) sold 7.7% of their position (383.13K shares) of SIMILARWEB LTD. on the open market

Open‑market sale worth $3.45M — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 4 sales

OFFER OR

Filed: 8/27/2026ACC: 0001976408-26-000777

InsiderOFFER ORCIK 1910424

→

IssuerSIMILARWEB LTD.CIK 1842731

Officer· Chief Executive Officer

Since Mar 2026

-383.13K

Net shares

Net seller

$3.45M

Total sold

Open market trades

0B · 4S

Total transactions

383.13K acquired · 766.25K disposed

Non-Derivative Transactions8

Ordinary shares

Direct

M · Option Exercise

+164.82K

Price / share

$2.71

Trade value

$446.65K

% of position

3.6%

8/26/2026

4.60M→4.76M

Ordinary shares

Direct

S · Sale

−164.82K

Price / share

$9.00

Trade value

$1.48M

% of position

3.5%

8/26/2026

4.76M→4.60M

Ordinary shares

Direct

M · Option Exercise

+39.30K

Price / share

$2.71

Trade value

$106.51K

% of position

0.9%

8/26/2026

4.60M→4.64M

Ordinary shares

Direct

S · Sale

−39.30K

Price / share

$9.01

Trade value

$354.19K

% of position

0.8%

8/26/2026

4.64M→4.60M

Ordinary shares

Direct

M · Option Exercise

+39K

Price / share

$0.40

Trade value

$15.60K

% of position

0.8%

8/26/2026

4.60M→4.64M

Ordinary shares

Direct

S · Sale

−39K

Price / share

$9.00

Trade value

$351.17K

% of position

0.8%

8/26/2026

4.64M→4.60M

Ordinary shares

Direct

M · Option Exercise

+140.01K

Price / share

$3.04

Trade value

$425.62K

% of position

3.0%

8/26/2026

4.60M→4.74M

Ordinary shares

Direct

S · Sale

−140.01K

Price / share

$9.01

Trade value

$1.26M

% of position

3.0%

8/26/2026

4.74M→4.60M

Total

Net shares

+0.00

Net value

-$2.46M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Ordinary shares Direct	8/26/2026	M · Option Exercise	+164.82K	$2.71	$446.65K	3.6%	4.60M	4.76M
Ordinary shares Direct	8/26/2026	S · Sale	−164.82K	$9.00	$1.48M	3.5%	4.76M	4.60M
Ordinary shares Direct	8/26/2026	M · Option Exercise	+39.30K	$2.71	$106.51K	0.9%	4.60M	4.64M
Ordinary shares Direct	8/26/2026	S · Sale	−39.30K	$9.01	$354.19K	0.8%	4.64M	4.60M
Ordinary shares Direct	8/26/2026	M · Option Exercise	+39K	$0.40	$15.60K	0.8%	4.60M	4.64M
Ordinary shares Direct	8/26/2026	S · Sale	−39K	$9.00	$351.17K	0.8%	4.64M	4.60M
Ordinary shares Direct	8/26/2026	M · Option Exercise	+140.01K	$3.04	$425.62K	3.0%	4.60M	4.74M
Ordinary shares Direct	8/26/2026	S · Sale	−140.01K	$9.01	$1.26M	3.0%	4.74M	4.60M
Total			+0.00		-$2.46M

Derivative Transactions4

Options to purchase one Ordinary Share

Direct

M · Option Exercise

Converts to

Ordinary shares

164.82K shares

−164.82K

Strike price

2.71

Held after

400K

Exercisable

—

8/26/2026

Options to purchase one Ordinary Share

Direct

M · Option Exercise

Converts to

Ordinary shares

39.30K shares

−39.30K

Strike price

2.71

Held after

400K

Exercisable

—

8/26/2026

Options to purchase one Ordinary Share

Direct

M · Option Exercise

Converts to

Ordinary shares

39K shares

−39K

Strike price

0.4

Held after

700K

Exercisable

—

8/26/2026

Options to purchase one Ordinary Share

Direct

M · Option Exercise

Converts to

Ordinary shares

140.01K shares

−140.01K

Strike price

3.04

Held after

0.00

Exercisable

—

8/26/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Options to purchase one Ordinary Share Direct	Ordinary shares164.82K shares	8/26/2026	M · Option Exercise	−164.82K	2.71	—	400K
Options to purchase one Ordinary Share Direct	Ordinary shares39.30K shares	8/26/2026	M · Option Exercise	−39.30K	2.71	—	400K
Options to purchase one Ordinary Share Direct	Ordinary shares39K shares	8/26/2026	M · Option Exercise	−39K	0.4	—	700K
Options to purchase one Ordinary Share Direct	Ordinary shares140.01K shares	8/26/2026	M · Option Exercise	−140.01K	3.04	—	0.00