Timothy B Lowinger - 20 Aug 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
20 Aug 2021
Net transactions value
-$10,748
Form type
4
Filing time
24 Aug 2021, 16:31:02 UTC
Previous filing
22 Jul 2021
Next filing
20 Dec 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 $13,651 +2,216 +2.9% $6.16 77,389 20 Aug 2021 Direct F1
transaction MRSN Common Stock Sale $24,398 -2,216 -2.9% $11.01* 75,173 20 Aug 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 -2,216 -2.8% $0.000000 77,195 20 Aug 2021 Common Stock 2,216 $6.16 Direct F1, F2
* 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 15, 2020.