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$MRSN All transactions

Mersana Therapeutics, Inc.

M 10b5-1 Plan

$ Value

$0

Shares

6,670

Price

$0

Filed

Sep 15

Insider

Name

Huber Martin H. Jr.

Title

President, CEO

CIK

0001653276

Roles

Director Officer

Transaction Details

Transaction Date

2025-09-11

Code

M

Table

Non-Derivative

Ownership

Direct

Equity Swap

No

Shares After

11,584

Footnotes

Represents shares of common stock received upon vesting of a portion of the restricted stock units ("RSUs") awarded to the Reporting Person on September 11, 2023. | Amounts reported in this Form 4 reflect the one-for-twenty-five reverse stock split effected by the Issuer on July 25, 2025. | 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 November 7, 2023. The sale was effected through an automatic "sell to cover" transaction that did not represent a discretionary trade by the Reporting Person. | The price reported is a weighted average sales price. The shares were sold in multiple transactions at prices ranging from $7.22 to $7.31, inclusive. The Reporting Person undertakes to provide to the Issuer, any security holder of the Issuer or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in this footnote. | Each RSU represents the contingent right to receive one share of common stock of the Issuer. | 25% of the total number of RSUs granted vested on September 11, 2025, and the remainder shall vest thereafter in equal annual installments over the next two years.

Filing Info

Accession No.

0001104659-25-090026

Form Type

4

Issuer CIK

0001442836

Huber Martin H. Jr.'s History

Date Ticker Type Value
2026-02-04 SNDX A $0
2026-01-06 MRSN U
2026-01-06 MRSN D
2026-01-06 MRSN D
2026-01-06 MRSN D
2026-01-06 MRSN D
2026-01-06 MRSN D
2026-01-06 MRSN D
2026-01-06 MRSN D
2026-01-06 MRSN D

Other Insiders at MRSN (90d)

No other insider activity at this issuer in the last 90 days.