DESCHUYTNER BRIAN (Sr. VP, Finance & Product stgy) sold 14.6% of their position (9.33K shares) of MERSANA THERAPEUTICS, INC. on the open market

Open‑market sale worth $25.3K — a moderate reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

DESCHUYTNER BRIAN

Filed: 1/17/2024ACC: 0001104659-24-004542

InsiderDESCHUYTNER BRIANCIK 1782163

→

IssuerMERSANA THERAPEUTICS, INC.CIK 1442836

Officer· Sr. VP, Finance & Product stgy

Since Jul 2019

+311.51K

Net shares

Net buyer

$25.3K

Total sold

Open market trades

0B · 1S

Total transactions

347.29K acquired · 35.78K disposed

Non-Derivative Transactions5

Common Stock

Direct

M · Option Exercise

+10K

Price / share

—

Trade value

—

% of position

26.8%

1/13/2024

37.38K→47.38K

Common Stock

Direct

M · Option Exercise

+6.25K

Price / share

—

Trade value

—

% of position

12.7%

1/14/2024

49.38K→55.63K

Common Stock

Direct

M · Option Exercise

+6.25K

Price / share

—

Trade value

—

% of position

11.7%

1/15/2024

53.63K→59.88K

Common Stock

Direct

M · Option Exercise

+3.96K

Price / share

—

Trade value

—

% of position

6.6%

1/15/2024

59.88K→63.84K

Common Stock

Direct

S · Sale

−9.33K

Price / share

$2.71

Trade value

$25.28K

% of position

14.6%

1/16/2024

63.84K→54.51K

Total

Net shares

+17.13K

Net value

-$25.28K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	1/13/2024	M · Option Exercise	+10K	—	—	26.8%	37.38K	47.38K
Common Stock Direct	1/14/2024	M · Option Exercise	+6.25K	—	—	12.7%	49.38K	55.63K
Common Stock Direct	1/15/2024	M · Option Exercise	+6.25K	—	—	11.7%	53.63K	59.88K
Common Stock Direct	1/15/2024	M · Option Exercise	+3.96K	—	—	6.6%	59.88K	63.84K
Common Stock Direct	1/16/2024	S · Sale	−9.33K	$2.71	$25.28K	14.6%	63.84K	54.51K
Total			+17.13K		-$25.28K

Derivative Transactions6

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

10K shares

−10K

Strike price

Held after

30K

Exercisable

—

1/13/2024

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

6.25K shares

−6.25K

Strike price

Held after

12.50K

Exercisable

—

1/14/2024

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

6.25K shares

−6.25K

Strike price

Held after

6.25K

Exercisable

—

1/15/2024

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

3.96K shares

−3.96K

Strike price

Held after

0.00

Exercisable

—

1/15/2024

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

262.50K shares

+262.50K

Strike price

3.02

Held after

262.50K

Exercisable

—

1/15/2024

Restricted Stock Unit

Direct

A · Award

Converts to

Common Stock

58.33K shares

+58.33K

Strike price

Held after

58.33K

Exercisable

—

1/15/2024

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Unit Direct	Common Stock10K shares	1/13/2024	M · Option Exercise	−10K		—	30K
Restricted Stock Unit Direct	Common Stock6.25K shares	1/14/2024	M · Option Exercise	−6.25K		—	12.50K
Restricted Stock Unit Direct	Common Stock6.25K shares	1/15/2024	M · Option Exercise	−6.25K		—	6.25K
Restricted Stock Unit Direct	Common Stock3.96K shares	1/15/2024	M · Option Exercise	−3.96K		—	0.00
Stock Option (Right to Buy) Direct	Common Stock262.50K shares	1/15/2024	A · Award	+262.50K	3.02	—	262.50K
Restricted Stock Unit Direct	Common Stock58.33K shares	1/15/2024	A · Award	+58.33K		—	58.33K