Timothy B Lowinger - 21 Jun 2021 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role
Chief Science & Tech. Officer
Signature
/s/ Brian DeSchuytner, as Attorney-in-Fact
Issuer symbol
MRSN
Transactions as of
21 Jun 2021
Net transactions value
-$16,922
Form type
4
Filing time
23 Jun 2021, 16:30:51 UTC
Previous filing
24 May 2021
Next filing
02 Jul 2021
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 $7.02 +2 +0.01% $3.51 31,446 21 Jun 2021 Direct F1
transaction MRSN Common Stock Sale $27.56 -2 -0.01% $13.78* 31,444 21 Jun 2021 Direct F1
transaction MRSN Common Stock Options Exercise $13,663 +2,218 +7.1% $6.16 33,662 21 Jun 2021 Direct F1
transaction MRSN Common Stock Sale $30,564 -2,218 -6.6% $13.78* 31,444 21 Jun 2021 Direct F1

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 -2 -0.02% $0.000000 12,180 21 Jun 2021 Common Stock 2 $3.51 Direct F1, F2
transaction MRSN Stock Option (right to buy) Options Exercise $0 -2,218 -2.6% $0.000000 81,647 21 Jun 2021 Common Stock 2,218 $6.16 Direct F1, F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Transaction effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 12, 2020.
F2 The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 23, 2019.
F3 The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 15, 2020.