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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
1442836	Mersana Therapeutics Inc.	MRSN	Pharmaceutical Preparations (2834)	000000000

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1645755	Alejandra Carvajal	C/O Mersana Therapeutics, Inc. 840 Memorial Drive Cambridge MA 02139	Chief Legal Officer	No	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2022-04-26	13,250	$0.00	13,250	No	4	M	Direct
Common Stock	Disposition	2022-04-26	3,948	$3.69	9,302	No	4	S	Direct

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Direct
No	4	S	Direct

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Restricted stock unit	Disposition	2022-04-26	13,250	$0.00	13,250	$0.00

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
13,250			No	4	M	Direct

Footnotes

Represents shares of common stock received upon the vesting of a portion of the restricted stock units ("RSUs") awarded to the Reporting Person on April 26, 2021.
Represents the sale of shares of common stock to satisfy the Reporting Person's tax withholding obligations in connection with the service-based vesting and settlement of the RSUs.
Each RSU represents the contingent right to receive one share of common stock of the Issuer.
The RSUs vested as to 50% of the shares on April 26, 2022 and will vest as to 50% of the shares on April 26, 2023, subject to the Reporting Person's continued service to the Issuer on such date.