MORTIMER IAN (PRESIDENT & CFO) sold 95.0% of their position (281.27K shares) of XENON PHARMACEUTICALS INC. on the open market

Open‑market sale worth $16.97M — a major position exit. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 10 sales

MORTIMER IAN

Filed: 3/11/2026ACC: 0001193125-26-102666

InsiderMORTIMER IANCIK 1619961

→

IssuerXENON PHARMACEUTICALS INC.CIK 1582313

Officer· PRESIDENT & CFO

Since Sep 2019

-261.27K

Net shares

Net seller

$16.97M

Total sold

Open market trades

0B · 10S

Total transactions

310K acquired · 571.27K disposed

Non-Derivative Transactions15

Common Shares

Direct

M · Option Exercise

+75K

Price / share

$8.40

Trade value

$630K

% of position

1250.0%

3/9/2026

6K→81K

Common Shares

Direct

S · Sale

−21.79K

Price / share

$58.81

Trade value

$1.28M

% of position

26.9%

3/9/2026

81K→59.21K

Common Shares

Direct

S · Sale

−31.69K

Price / share

$59.88

Trade value

$1.90M

% of position

53.5%

3/9/2026

59.21K→27.52K

Common Shares

Direct

S · Sale

−21.52K

Price / share

$60.49

Trade value

$1.30M

% of position

78.2%

3/9/2026

27.52K→6K

Common Shares

Direct

M · Option Exercise

+25K

Price / share

$3.10

Trade value

$77.50K

% of position

416.7%

3/9/2026

6K→31K

Common Shares

Direct

S · Sale

−12.48K

Price / share

$59.50

Trade value

$742.50K

% of position

40.3%

3/9/2026

31K→18.52K

Common Shares

Direct

S · Sale

−10.07K

Price / share

$60.47

Trade value

$609.05K

% of position

54.4%

3/9/2026

18.52K→8.45K

Common Shares

Direct

S · Sale

−2.45K

Price / share

$61.26

Trade value

$150.03K

% of position

29.0%

3/9/2026

8.45K→6K

Common Shares

Direct

M · Option Exercise

+105K

Price / share

$4.75

Trade value

$498.75K

% of position

1750.0%

3/9/2026

6K→111K

Common Shares

Direct

S · Sale

−43.35K

Price / share

$59.26

Trade value

$2.57M

% of position

37.4%

3/9/2026

116K→72.65K

Common Shares

Direct

S · Sale

−61.65K

Price / share

$60.08

Trade value

$3.70M

% of position

91.1%

3/9/2026

67.65K→6K

Common Shares

Direct

M · Option Exercise

+65K

Price / share

$9.44

Trade value

$613.60K

% of position

1083.3%

3/9/2026

6K→71K

Common Shares

Direct

S · Sale

−65K

Price / share

$62.06

Trade value

$4.03M

% of position

91.5%

3/9/2026

71K→6K

Common Shares

Direct

M · Option Exercise

+20K

Price / share

—

Trade value

—

% of position

333.3%

3/9/2026

6K→26K

Common Shares

Direct

S · Sale

−11.27K

Price / share

$60.11

Trade value

$677.36K

% of position

43.3%

3/10/2026

26K→14.73K

Total

Net shares

+8.73K

Net value

-$15.15M

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Shares Direct	3/9/2026	M · Option Exercise	+75K	$8.40	$630K	1250.0%	6K	81K
Common Shares Direct	3/9/2026	S · Sale	−21.79K	$58.81	$1.28M	26.9%	81K	59.21K
Common Shares Direct	3/9/2026	S · Sale	−31.69K	$59.88	$1.90M	53.5%	59.21K	27.52K
Common Shares Direct	3/9/2026	S · Sale	−21.52K	$60.49	$1.30M	78.2%	27.52K	6K
Common Shares Direct	3/9/2026	M · Option Exercise	+25K	$3.10	$77.50K	416.7%	6K	31K
Common Shares Direct	3/9/2026	S · Sale	−12.48K	$59.50	$742.50K	40.3%	31K	18.52K
Common Shares Direct	3/9/2026	S · Sale	−10.07K	$60.47	$609.05K	54.4%	18.52K	8.45K
Common Shares Direct	3/9/2026	S · Sale	−2.45K	$61.26	$150.03K	29.0%	8.45K	6K
Common Shares Direct	3/9/2026	M · Option Exercise	+105K	$4.75	$498.75K	1750.0%	6K	111K
Common Shares Direct	3/9/2026	S · Sale	−43.35K	$59.26	$2.57M	37.4%	116K	72.65K
Common Shares Direct	3/9/2026	S · Sale	−61.65K	$60.08	$3.70M	91.1%	67.65K	6K
Common Shares Direct	3/9/2026	M · Option Exercise	+65K	$9.44	$613.60K	1083.3%	6K	71K
Common Shares Direct	3/9/2026	S · Sale	−65K	$62.06	$4.03M	91.5%	71K	6K
Common Shares Direct	3/9/2026	M · Option Exercise	+20K	—	—	333.3%	6K	26K
Common Shares Direct	3/10/2026	S · Sale	−11.27K	$60.11	$677.36K	43.3%	26K	14.73K
Total			+8.73K		-$15.15M

Derivative Transactions6

Stock Option

Direct

M · Option Exercise

Converts to

Common Shares

75K shares

−75K

Strike price

8.40

Held after

0.00

Exercisable

—

3/9/2026

Stock Option

Direct

M · Option Exercise

Converts to

Common Shares

25K shares

−25K

Strike price

3.10

Held after

0.00

Exercisable

—

3/9/2026

Stock Option

Direct

M · Option Exercise

Converts to

Common Shares

105K shares

−105K

Strike price

4.75

Held after

0.00

Exercisable

—

3/9/2026

Stock Option

Direct

M · Option Exercise

Converts to

Common Shares

65K shares

−65K

Strike price

9.44

Held after

0.00

Exercisable

—

3/9/2026

Performance Share Units

Direct

A · Award

Converts to

Common Shares

20K shares

+20K

Strike price

Held after

20K

Exercisable

—

3/9/2026

Performance Share Units

Direct

M · Option Exercise

Converts to

Common Shares

20K shares

−20K

Strike price

Held after

0.00

Exercisable

—

3/9/2026

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock Option Direct	Common Shares75K shares	3/9/2026	M · Option Exercise	−75K	8.40	—	0.00
Stock Option Direct	Common Shares25K shares	3/9/2026	M · Option Exercise	−25K	3.10	—	0.00
Stock Option Direct	Common Shares105K shares	3/9/2026	M · Option Exercise	−105K	4.75	—	0.00
Stock Option Direct	Common Shares65K shares	3/9/2026	M · Option Exercise	−65K	9.44	—	0.00
Performance Share Units Direct	Common Shares20K shares	3/9/2026	A · Award	+20K		—	20K
Performance Share Units Direct	Common Shares20K shares	3/9/2026	M · Option Exercise	−20K		—	0.00

Non-Derivative Holdings (Post-Transaction)1

Common Shares

Indirect

Shares owned14.30K

Total

14.30K indirect14.30K

Security Title	Shares Owned	Ownership Type
Common Shares	14.30K	Indirect
Total	14.30K	14.30K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported