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

Role
SVP, Chief Sci.&Tech. Off.
Signature
/s/ Alejandra Carvajal, as Attorney-in-Fact
Issuer symbol
MRSN
Transactions as of
14 Dec 2022
Net transactions value
+$52,658
Form type
4
Filing time
16 Dec 2022, 15:46:33 UTC
Previous filing
19 Jan 2022
Next filing
18 Jan 2023
SEC
View on sec.gov

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MRSN Common Stock Options Exercise $15,555 +11,111 +8.5% $1.40 142,345 14 Dec 2022 Direct
transaction MRSN Common Stock Options Exercise $37,102 +24,250 +17% $1.53 166,595 14 Dec 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 -11,111 -100% $0.000000* 0 14 Dec 2022 Common Stock 11,111 $1.40 Direct F1
transaction MRSN Stock Option (right to buy) Options Exercise $0 -24,250 -19% $0.000000 103,868 14 Dec 2022 Common Stock 128,118 $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