PROTOPAPAS ANNA (President & CEO) sold 26.3% of their position (17.35K shares) of MERSANA THERAPEUTICS, INC. on the open market

Open‑market sale worth $99.6K — a significant reduction. Review remaining holdings and any 10b5‑1 plan disclosures.

S · 1 sale

PROTOPAPAS ANNA

Filed: 1/18/2023ACC: 0001104659-23-004744

InsiderPROTOPAPAS ANNACIK 1347582

→

IssuerMERSANA THERAPEUTICS, INC.CIK 1442836

DirectorOfficer· President & CEO

Since Jan 2019

+670.15K

Net shares

Net buyer

$99.6K

Total sold

Open market trades

0B · 1S

Total transactions

983.45K acquired · 313.30K disposed

Non-Derivative Transactions6

Common Stock

Direct

G · Gift

−240.24K

Price / share

—

Trade value

—

% of position

95.9%

5/20/2022

250.62K→10.37K

Common Stock

Indirect

G · Gift

+240.24K

Price / share

—

Trade value

—

% of position

New position

5/20/2022

0.00→240.24K

Common Stock

Direct

M · Option Exercise

+16.75K

Price / share

—

Trade value

—

% of position

161.5%

1/14/2023

10.37K→27.12K

Common Stock

Direct

M · Option Exercise

+21.25K

Price / share

—

Trade value

—

% of position

78.4%

1/15/2023

27.12K→48.37K

Common Stock

Direct

M · Option Exercise

+17.71K

Price / share

—

Trade value

—

% of position

36.6%

1/15/2023

48.37K→66.08K

Common Stock

Direct

S · Sale

−17.35K

Price / share

$5.74

Trade value

$99.57K

% of position

26.3%

1/17/2023

66.08K→48.73K

Total

Net shares

+38.36K

Net value

-$99.57K

Security	Date	Type	Shares	Price / Share	Trade Value	% of Position	Held Before	Held After
Common Stock Direct	5/20/2022	G · Gift	−240.24K	—	—	95.9%	250.62K	10.37K
Common Stock Indirect	5/20/2022	G · Gift	+240.24K	—	—	New position	0.00	240.24K
Common Stock Direct	1/14/2023	M · Option Exercise	+16.75K	—	—	161.5%	10.37K	27.12K
Common Stock Direct	1/15/2023	M · Option Exercise	+21.25K	—	—	78.4%	27.12K	48.37K
Common Stock Direct	1/15/2023	M · Option Exercise	+17.71K	—	—	36.6%	48.37K	66.08K
Common Stock Direct	1/17/2023	S · Sale	−17.35K	$5.74	$99.57K	26.3%	66.08K	48.73K
Total			+38.36K		-$99.57K

Derivative Transactions5

Stock option (right to buy)

Direct

A · Award

Converts to

Common Stock

562.50K shares

+562.50K

Strike price

6.06

Held after

562.50K

Exercisable

—

1/13/2023

Restricted stock unit

Direct

A · Award

Converts to

Common Stock

125K shares

+125K

Strike price

Held after

125K

Exercisable

—

1/13/2023

Restricted stock unit

Direct

M · Option Exercise

Converts to

Common Stock

16.75K shares

−16.75K

Strike price

Held after

50.25K

Exercisable

—

1/14/2023

Restricted stock unit

Direct

M · Option Exercise

Converts to

Common Stock

21.25K shares

−21.25K

Strike price

Held after

42.50K

Exercisable

—

1/15/2023

Restricted stock unit

Direct

M · Option Exercise

Converts to

Common Stock

17.71K shares

−17.71K

Strike price

Held after

17.71K

Exercisable

—

1/15/2023

Security	Converts To	Date	Type	Shares	Strike Price	Exercisable	Held After
Stock option (right to buy) Direct	Common Stock562.50K shares	1/13/2023	A · Award	+562.50K	6.06	—	562.50K
Restricted stock unit Direct	Common Stock125K shares	1/13/2023	A · Award	+125K		—	125K
Restricted stock unit Direct	Common Stock16.75K shares	1/14/2023	M · Option Exercise	−16.75K		—	50.25K
Restricted stock unit Direct	Common Stock21.25K shares	1/15/2023	M · Option Exercise	−21.25K		—	42.50K
Restricted stock unit Direct	Common Stock17.71K shares	1/15/2023	M · Option Exercise	−17.71K		—	17.71K

Non-Derivative Holdings (Post-Transaction)1

Common Stock

Indirect

Shares owned72.26K

Total

72.26K indirect72.26K

Security Title	Shares Owned	Ownership Type
Common Stock	72.26K	Indirect
Total	72.26K	72.26K indirect

Derivative Holdings (Post-Transaction)0

No derivative holdings reported