LOWINGER TIMOTHY B (Chief Scientific Officer) sold 5.0% of their position (10.41K shares) of MERSANA THERAPEUTICS, INC. on the open market

Open‑market sale worth $28.2K — a minor trim. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

LOWINGER TIMOTHY B

Filed: 1/17/2024ACC: 0001104659-24-004547

InsiderLOWINGER TIMOTHY BCIK 1709775

→

IssuerMERSANA THERAPEUTICS, INC.CIK 1442836

Officer· Chief Scientific Officer

Since Jul 2018

+264.59K

Net shares

Net buyer

$28.2K

Total sold

Open market trades

0B · 1S

Total transactions

304.38K acquired · 39.78K disposed

Non-Derivative Transactions5

Common Stock

Direct

M · Option Exercise

+9.38K

Price / share

—

Trade value

—

% of position

5.2%

1/13/2024

180.36K→189.74K

Common Stock

Direct

M · Option Exercise

+4.79K

Price / share

—

Trade value

—

% of position

2.5%

1/14/2024

189.74K→194.53K

Common Stock

Direct

M · Option Exercise

+7.29K

Price / share

—

Trade value

—

% of position

3.7%

1/15/2024

194.53K→201.82K

Common Stock

Direct

M · Option Exercise

+7.92K

Price / share

—

Trade value

—

% of position

3.9%

1/15/2024

201.82K→209.74K

Common Stock

Direct

S · Sale

−10.41K

Price / share

$2.71

Trade value

$28.21K

% of position

5.0%

1/16/2024

209.74K→199.33K

Total

Net shares

+18.97K

Net value

-$28.21K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	1/13/2024	M · Option Exercise	+9.38K	—	—	5.2%	180.36K	189.74K
Common Stock Direct	1/14/2024	M · Option Exercise	+4.79K	—	—	2.5%	189.74K	194.53K
Common Stock Direct	1/15/2024	M · Option Exercise	+7.29K	—	—	3.7%	194.53K	201.82K
Common Stock Direct	1/15/2024	M · Option Exercise	+7.92K	—	—	3.9%	201.82K	209.74K
Common Stock Direct	1/16/2024	S · Sale	−10.41K	$2.71	$28.21K	5.0%	209.74K	199.33K
Total			+18.97K		-$28.21K

Derivative Transactions6

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

9.38K shares

−9.38K

Strike price

Held after

28.13K

Exercisable

—

1/13/2024

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

4.79K shares

−4.79K

Strike price

Held after

9.58K

Exercisable

—

1/14/2024

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

7.29K shares

−7.29K

Strike price

Held after

7.29K

Exercisable

—

1/15/2024

Restricted Stock Unit

Direct

M · Option Exercise

Converts to

Common Stock

7.92K shares

−7.92K

Strike price

Held after

0.00

Exercisable

—

1/15/2024

Stock Option (Right to Buy)

Direct

A · Award

Converts to

Common Stock

225K shares

+225K

Strike price

3.02

Held after

225K

Exercisable

—

1/15/2024

Restricted Stock Unit

Direct

A · Award

Converts to

Common Stock

50K shares

+50K

Strike price

Held after

50K

Exercisable

—

1/15/2024

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Restricted Stock Unit Direct	Common Stock9.38K shares	1/13/2024	M · Option Exercise	−9.38K		—	28.13K
Restricted Stock Unit Direct	Common Stock4.79K shares	1/14/2024	M · Option Exercise	−4.79K		—	9.58K
Restricted Stock Unit Direct	Common Stock7.29K shares	1/15/2024	M · Option Exercise	−7.29K		—	7.29K
Restricted Stock Unit Direct	Common Stock7.92K shares	1/15/2024	M · Option Exercise	−7.92K		—	0.00
Stock Option (Right to Buy) Direct	Common Stock225K shares	1/15/2024	A · Award	+225K	3.02	—	225K
Restricted Stock Unit Direct	Common Stock50K shares	1/15/2024	A · Award	+50K		—	50K