Timothy B. Lowinger - Dec 14, 2022 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role
SVP, Chief Sci.&Tech. Off.
Signature
/s/ Alejandra Carvajal, as Attorney-in-Fact
Stock symbol
MRSN
Transactions as of
Dec 14, 2022
Transactions value $
$52,658
Form type
4
Date filed
12/16/2022, 03:46 PM
Previous filing
Jan 19, 2022
Next filing
Jan 18, 2023

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MRSN Common Stock Options Exercise $15.6K +11.1K +8.47% $1.40 142K Dec 14, 2022 Direct
transaction MRSN Common Stock Options Exercise $37.1K +24.3K +17.04% $1.53 167K Dec 14, 2022 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 -11.1K -100% $0.00* 0 Dec 14, 2022 Common Stock 11.1K $1.40 Direct F1
transaction MRSN Stock Option (right to buy) Options Exercise $0 -24.3K -18.93% $0.00 104K Dec 14, 2022 Common Stock 128K $1.53 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 The options vested in equal quarterly installments over the first four years after the vesting commencement date, March 31, 2014.
F2 The options vested in equal quarterly installments over the first four years after the vesting commencement date, June 12, 2015.

Remarks:

Exhibit 24 - Power of Attorney