Mohan Bala - Oct 25, 2023 Form 4 Insider Report for Mersana Therapeutics, Inc. (MRSN)

Role
SVP, Chief Development Officer
Signature
/s/ Alejandra Carvajal, Attorney-in-Fact
Stock symbol
MRSN
Transactions as of
Oct 25, 2023
Transactions value $
-$2,161
Form type
4
Date filed
10/27/2023, 04:07 PM
Previous filing
Sep 7, 2023
Next filing
Jan 17, 2024

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MRSN Common Stock Options Exercise $0 +6.25K +142.21% $0.00 10.6K Oct 25, 2023 Direct F1
transaction MRSN Common Stock Sale -$2.16K -1.91K -17.96% $1.13 8.73K Oct 26, 2023 Direct F2

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 Restricted Stock Unit Options Exercise $0 -6.25K -33.33% $0.00 12.5K Oct 25, 2023 Common Stock 6.25K Direct F3, F4
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

Transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c).

Explanation of Responses:

Id Content
F1 Represents shares of common stock received upon vesting of a portion of the restricted stock units ("RSUs") awarded to the Reporting Person on October 25, 2021.
F2 Represents the sale of shares of common stock to satisfy the Reporting Person's tax withholding obligations in connection with the service-based vesting and settlement of the RSUs pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on May 10, 2023. The sale was effected through an automatic "sell to cover" transaction that did not represent a discretionary trade by the Reporting Person.
F3 Each RSU represents the contingent right to receive one share of common stock of the Issuer.
F4 6,250 RSUs vested on October 25, 2023, and the remainder will vest in two equal installments on October 25, 2024, and October 25, 2025, subject to the Reporting Person's continued service to the Issuer on such vesting date.