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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
1709775	B Timothy Lowinger	C/O Mersana Therapeutics, Inc. 840 Memorial Drive Cambridge MA 02139	Chief Scientific 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	2018-08-27	3,500	$7.43	15,991	No	4	M	Direct
Common Stock	Disposition	2018-08-27	3,500	$13.15	12,491	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	Option to purchase Common Stock	Disposition	2018-08-27	3,500	$0.00	3,500	$7.43

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
1,611		2021-05-11	No	4	M	Direct

Footnotes

Transaction made pursuant to Dr. Lowinger's company approved trading plan under Rule 10b5-1.
This price is a weighted average price. These shares were sold in multiple transactions at prices ranging from $13.00 to $13.50, inclusive. The reporting person undertakes to provide to Mersana Therapeutics, Inc., any other security holder of Mersana Therapeutics Inc. or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote.
The option vested 25% on May 12, 2012 and in equal quarterly installments thereafter.