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 has been a registered insider since 2003.
                                      
                                  As Chief Technology Officer at Mersana Therapeutics,  last made a transaction on 1/16/2025.
                              
| 
                              InsiderInsights.com Purchase Scorecard
                             | 
|  |  | 
                              Transaction Date
                             | 
| Nq | Hit Rate
 | Mean Return
 | Median Return
 | Range of Returns
 | Time From Purchases
 | Nq | Hit Rate
 | Mean Return
 | Median Return
 | Range of Returns
 | 
| 6 | 17% | -53% | -57% | 79 | 1 Year | 6 | 0% | -- | -- | -- | 
| 6 | 17% | -51% | -67% | 98 | 9 Month | 6 | 0% | -- | -- | -- | 
| 6 | 0% | -41% | -42% | 67 | 6 Month | 6 | 0% | -- | -- | -- | 
| 6 | 33% | -17% | -30% | 85 | 3 Month | 6 | 0% | -- | -- | -- | 
| 6 | 33% | -4% | -4% | 65 | 1 Month | 6 | 0% | -- | -- | -- | 
| 6 | 17% | -7% | -7% | 16 | 1 Week | 6 | 0% | -- | -- | -- | 
| 
                              InsiderInsights.com Sales Scorecard
                             | 
|  |  | 
                              Transaction Date
                             | 
| Nq | Hit Rate
 | Mean Return
 | Median Return
 | Range of Returns
 | Time From Sales
 | Nq | Hit Rate
 | Mean Return
 | Median Return
 | Range of Returns
 | 
| 18 | 89% | -44% | -72% | 392 | 1 Year | 18 | 0% | -- | -- | -- | 
| 21 | 81% | 173% | -63% | 1,699 | 9 Month | 21 | 0% | -- | -- | -- | 
| 21 | 95% | -43% | -47% | 85 | 6 Month | 21 | 0% | -- | -- | -- | 
| 21 | 90% | -27% | -29% | 115 | 3 Month | 21 | 0% | -- | -- | -- | 
| 21 | 76% | -7% | -6% | 73 | 1 Month | 21 | 0% | -- | -- | -- | 
| 21 | 67% | -3% | -2% | 34 | 1 Week | 21 | 0% | -- | -- | -- | 
| Scorecards Updated 10/30/2025 11:17 AM EST | Latest Transaction Date: | 1/16/2025 | 
| Average days between Transaction and Entered Dates: | 2 |