| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MRSN | Common Stock | Options Exercise | +15.2K | +12.59% | 136K | Jan 14, 2022 | Direct | F1 | ||
| transaction | MRSN | Common Stock | Sale | -$28.1K | -4.74K | -3.49% | $5.92 | 131K | Jan 18, 2022 | Direct | F2, F3 |
| Type | Sym | Class | Transaction | Value $ | Shares | Change % | * Price $ | Shares After | Date | Underlying Class | Amount | Exercise Price | Ownership | Footnotes |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| transaction | MRSN | Restricted Stock Units | Options Exercise | $0 | -7.92K | -33.33% | $0.00 | 15.8K | Jan 14, 2022 | Common Stock | 7.92K | Direct | F1, F4 | |
| transaction | MRSN | Restricted Stock Units | Options Exercise | $0 | -7.29K | -25% | $0.00 | 21.9K | Jan 14, 2022 | Common Stock | 7.29K | Direct | F1, F5 | |
| transaction | MRSN | Stock Option (right to buy) | Award | $0 | +86.3K | $0.00 | 86.3K | Jan 14, 2022 | Common Stock | 86.3K | $6.28 | Direct | F6 | |
| transaction | MRSN | Restricted Stock Units | Award | $0 | +19.2K | $0.00 | 19.2K | Jan 14, 2022 | Common Stock | 19.2K | Direct | F1, F7 |
| Id | Content |
|---|---|
| F1 | Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's common stock upon vesting. |
| F2 | Represents the number of shares sold by the reporting person to cover tax withholding obligations in connection with the vesting of the RSUs listed in Table II. These sales were mandated by the Issuer's election under its equity incentive plans to require the reporting person to sell a number of shares of common stock needed to satisfy his tax withholding obligations and does not represent a discretionary trade by the reporting person. |
| F3 | The price reported in Column 4 is a weighted-average price. These shares were sold in multiple transactions at prices ranging from $5.82 to $5.92, inclusive. The reporting person undertakes to provide to Mersana Therapeutics, Inc., any security holder of Mersana Therapeutics, Inc., 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 footnote (3) to this Form 4. |
| F4 | 50% of the total number of RSUs vested as of January 14, 2022, and thereafter shall vest in equal annual installments over the next two years. |
| F5 | 25% of the total number of RSUs vested on January 14, 2022, and thereafter shall vest in equal annual installments over the next three years. |
| F6 | The option vests in equal quarterly installments over the first four years after the vesting commencement date, January 14, 2022. |
| F7 | The restricted stock units vest in equal annual installments over the first four years after the vesting commencement date, January 14, 2022. |