Timothy B. Lowinger - Dec 20, 2021 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role
Chief Science & Tech. Officer
Signature
/s/ Brian DeSchuytner, as Attorney-in-Fact
Stock symbol
MRSN
Transactions as of
Dec 20, 2021
Transactions value $
$63,830
Form type
4
Date filed
12/20/2021, 04:01 PM
Previous filing
Aug 24, 2021
Next filing
Jan 19, 2022

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MRSN Common Stock Options Exercise $63.8K +45.6K +60.65% $1.40 121K Dec 20, 2021 Direct

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction MRSN Stock Option (right to buy) Options Exercise $0 -45.6K -100% $0.00* 0 Dec 20, 2021 Common Stock 45.6K $1.40 Direct F1
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The option vested 25% on October 2, 2013, and in equal quarterly installments thereafter.