Timothy B. Lowinger - Jul 8, 2021 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role
CS & Technology Officer
Signature
/s/ Brian DeSchuytner, as Attorney-in-Fact
Stock symbol
MRSN
Transactions as of
Jul 8, 2021
Transactions value $
$28,000
Form type
4
Date filed
7/9/2021, 05:25 PM
Previous filing
Jul 2, 2021
Next filing
Jul 19, 2021

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MRSN Common Stock Options Exercise $28K +20K +63.61% $1.40 51.4K Jul 8, 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 -20K -30.49% $0.00 45.6K Jul 8, 2021 Common Stock 20K $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 August 1, 2013, and in equal quarterly installments thereafter.