Mersana Therapeutics, Inc. (MRSN)

Latest Insider Confidence Score

2026Q1

49.7
Bearish

Company insider confidence (by quarter)

2017Q2 2026Q1

Largest shareholders

Insider Role (last 12 mo) Shares held Filed at
Nextech Crossover I Scsp — 12,067,246 Dec 30, 2024
Nextech Crossover I GP S.a r.l. — 12,067,246 Dec 30, 2024
Charoub Ian — 12,067,246 Dec 30, 2024
Constantinides Costas — 12,067,246 Dec 30, 2024
Sgobbo Rocco — 12,067,246 Dec 30, 2024

Recent buy/sell transactions

Exec date Filing date Insider Role Signal Confidence Shares % of shares Under plan? Amount (USD)
Jan 6, 2026 Jan 6, 2026 Hack Andrew A. F. Director Neutral 47.5 -347,123 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Hege Kristen Director Neutral 47.5 -578 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Diaz Allene M. Director Neutral 47.5 -578 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Dere Willard H Director Neutral 47.5 -1,567 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Carvajal Alejandra SVP, Chief Legal Officer Neutral 47.5 -3,131 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Bala Mohan SVP, Chief Development Neutral 47.5 -2,927 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Alleva Lawrence M Director Neutral 47.5 -662 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Huber Martin H. Jr. CEO Neutral 47.5 -9,573 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Mandelia Ashish VP, Chief Accounting Officer Neutral 47.5 -2,300 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Protopapas Anna Director Neutral 47.5 -19,220 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 Lowinger Timothy B SVP, Chief Sci.&Tech. Officer Neutral 47.5 -10,466 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 MOTT DAVID M Director Neutral 47.5 -23,929 -100.00% ✗ -
Jan 6, 2026 Jan 6, 2026 DeSchuytner Brian CFO Neutral 47.5 -5,015 -100.00% ✗ -
Oct 25, 2025 Oct 28, 2025 Bala Mohan SVP, Chief Development Officer Sell 46.3 -77 -2.57% ✓ $762.3
Sep 11, 2025 Sep 15, 2025 Huber Martin H. Jr. CEO Sell 23.8 -2,012 -17.37% ✓ $14.7K
Jun 12, 2025 Jun 13, 2025 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Jun 12, 2025 Jun 13, 2025 Hack Andrew A. F. Director Neutral 52.5 - 0.00% ✗ -
Jun 12, 2025 Jun 13, 2025 Dere Willard H Director Neutral 52.5 - 0.00% ✗ -
Jun 12, 2025 Jun 13, 2025 Diaz Allene M. Director Neutral 52.5 - 0.00% ✗ -
Jun 12, 2025 Jun 13, 2025 Protopapas Anna Director Neutral 52.5 - 0.00% ✗ -
Jun 12, 2025 Jun 13, 2025 Hege Kristen Director Neutral 52.5 - 0.00% ✗ -
Jun 12, 2025 Jun 13, 2025 MOTT DAVID M Director Neutral 52.5 - 0.00% ✗ -
Jan 15, 2025 Jan 17, 2025 Mandelia Ashish VP, Chief Accounting Officer Sell 37.5 -3,554 -5.82% ✓ $2.1K
Jan 15, 2025 Jan 17, 2025 Protopapas Anna Director Sell 50.0 -8,637 -1.77% ✓ $5K
Jan 15, 2025 Jan 17, 2025 Lowinger Timothy B SVP, Chief Sci.&Tech. Officer Sell 42.5 -8,048 -3.03% ✓ $4.7K
Jan 15, 2025 Jan 17, 2025 Huber Martin H. Jr. CEO Sell 42.5 -4,514 -3.54% ✓ $2.6K
Jan 15, 2025 Jan 17, 2025 DeSchuytner Brian CFO Sell 37.5 -8,470 -6.52% ✓ $4.9K
Jan 15, 2025 Jan 17, 2025 Carvajal Alejandra SVP, Chief Legal Officer Sell 37.5 -5,096 -6.11% ✓ $3K
Jan 15, 2025 Jan 17, 2025 Bala Mohan SVP, Chief Development Officer Sell 33.8 -5,939 -7.94% ✓ $3.4K
Jan 14, 2025 Jan 16, 2025 Protopapas Anna Director Sell 50.0 -6,191 -1.31% ✓ $3.9K
Jan 14, 2025 Jan 16, 2025 Mandelia Ashish VP, Chief Accounting Officer Sell 42.5 -1,791 -3.31% ✓ $1.1K
Jan 14, 2025 Jan 16, 2025 Lowinger Timothy B SVP, Chief Sci.&Tech. Officer Sell 52.5 -1,794 -0.72% ✓ $1.1K
Jan 14, 2025 Jan 16, 2025 DeSchuytner Brian CFO Sell 46.3 -2,331 -2.09% ✓ $1.5K
Jan 14, 2025 Jan 16, 2025 Carvajal Alejandra SVP, Chief Legal Officer Sell 50.0 -952 -1.33% ✓ $599.8
Jan 13, 2025 Jan 15, 2025 Protopapas Anna Director Sell 46.3 -11,534 -2.46% ✓ $7.6K
Jan 13, 2025 Jan 15, 2025 Mandelia Ashish VP, Chief Accounting Officer Sell 50.0 -1,007 -2.00% ✓ $664.6
Jan 13, 2025 Jan 15, 2025 Lowinger Timothy B SVP, Chief Sci.&Tech. Officer Sell 50.0 -3,483 -1.41% ✓ $2.3K
Jan 13, 2025 Jan 15, 2025 DeSchuytner Brian CFO Sell 42.5 -3,713 -3.41% ✓ $2.5K
Jan 13, 2025 Jan 15, 2025 Carvajal Alejandra SVP, Chief Legal Officer Sell 42.5 -3,330 -4.58% ✓ $2.2K
Jan 13, 2025 Jan 15, 2025 Bala Mohan SVP, Chief Development Officer Sell 37.5 -3,253 -5.12% ✓ $2.1K
Jan 2, 2025 Jan 3, 2025 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Dec 30, 2024 NEXTECH CROSSOVER I SCSP 10% Owner Neutral 52.5 - 0.00% ✗ -
Dec 19, 2024 Dec 23, 2024 EcoR1 Capital, LLC 10% Owner Neutral 27.5 -8,036,688 -41.50% ✗ -
Oct 25, 2024 Oct 29, 2024 Bala Mohan SVP, Chief Development Officer Sell 42.5 -1,884 -3.33% ✓ $3.6K
Oct 1, 2024 Oct 7, 2024 DeSchuytner Brian CFO Sell 28.8 -13,687 -12.61% ✓ $27.2K
Oct 1, 2024 Oct 7, 2024 Carvajal Alejandra SVP, Chief Legal Officer Sell 23.8 -13,687 -17.68% ✓ $27.2K
Oct 1, 2024 Oct 7, 2024 Bala Mohan SVP, Chief Development Officer Sell 18.8 -13,687 -21.37% ✓ $27.2K
Oct 1, 2024 Oct 7, 2024 Mandelia Ashish VP, Chief Accounting Officer Sell 28.8 -8,216 -14.68% ✓ $16.3K
Oct 1, 2024 Oct 7, 2024 Lowinger Timothy B SVP, Chief Sci.&Tech. Officer Sell 36.3 -13,687 -5.49% ✓ $27.2K
Oct 1, 2024 Oct 3, 2024 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Sep 11, 2024 Sep 13, 2024 Huber Martin H. Jr. CEO Sell 10.0 -50,423 -30.24% ✓ $88.7K
Jul 1, 2024 Jul 2, 2024 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 Hack Andrew A. F. Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 Protopapas Anna Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 MOTT DAVID M Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 Hege Kristen Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 Diaz Allene M. Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 Dere Willard H Director Neutral 52.5 - 0.00% ✗ -
Jun 11, 2024 Jun 12, 2024 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Apr 1, 2024 Apr 3, 2024 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Feb 16, 2024 Mandelia Ashish VP, Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Jan 13, 2024 Jan 17, 2024 Protopapas Anna Director Sell 32.5 -29,399 -6.29% ✓ $79.7K
Jan 13, 2024 Jan 17, 2024 MISRA TUSHAR SVP, Chief Manuf. Officer Sell 25.0 -3,357 -15.74% ✓ $9.1K
Jan 13, 2024 Jan 17, 2024 Mandelia Ashish VP, Chief Accounting Officer Sell 23.8 -5,025 -17.72% ✓ $13.6K
Jan 13, 2024 Jan 17, 2024 Lowinger Timothy B SVP, Chief Sci.&Tech. Officer Sell 41.3 -10,409 -4.96% ✓ $28.2K
Jan 15, 2024 Jan 17, 2024 Huber Martin H. Jr. CEO Neutral 52.5 - 0.00% ✗ -
Jan 13, 2024 Jan 17, 2024 Carvajal Alejandra SVP, Chief Legal Officer Sell 28.8 -4,381 -13.78% ✓ $11.9K
Jan 13, 2024 Jan 17, 2024 DeSchuytner Brian CFO Sell 28.8 -9,327 -14.61% ✓ $25.3K
Jan 13, 2024 Jan 17, 2024 Bala Mohan SVP, Chief Development Officer Sell 25.0 -3,431 -19.62% ✓ $9.3K
Jan 2, 2024 Jan 4, 2024 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Jan 2, 2024 Jan 4, 2024 Hege Kristen Director Neutral 52.5 - 0.00% ✗ -
Jan 2, 2024 Jan 4, 2024 Dere Willard H Director Neutral 90.0 +6,112 18.48% ✗ -
Jan 2, 2024 Jan 4, 2024 MOTT DAVID M Director Neutral 77.5 +8,810 1.49% ✗ -
Oct 25, 2023 Oct 27, 2023 Bala Mohan SVP, Chief Development Officer Sell 25.0 -1,912 -17.96% ✓ $2.2K
Oct 2, 2023 Oct 4, 2023 Huber Martin H. Jr. CEO Neutral 52.5 - 0.00% ✗ -
Oct 2, 2023 Oct 4, 2023 Dere Willard H Director Neutral 90.0 +11,011 49.92% ✗ -
Oct 2, 2023 Oct 4, 2023 Hege Kristen Director Neutral 52.5 - 0.00% ✗ -
Oct 2, 2023 Oct 4, 2023 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Oct 2, 2023 Oct 4, 2023 MOTT DAVID M Director Neutral 82.5 +15,873 2.77% ✗ -
Sep 11, 2023 Sep 13, 2023 Protopapas Anna Director Neutral 82.5 +16,643 4.58% ✗ -
Sep 11, 2023 Sep 13, 2023 Huber Martin H. Jr. CEO Neutral 52.5 - 0.00% ✗ -
Sep 5, 2023 Sep 7, 2023 Carvajal Alejandra SVP, Chief Legal Officer Neutral 52.5 - 0.00% ✗ -
Sep 5, 2023 Sep 7, 2023 Lowinger Timothy B SVP, Chief Sci.&Tech. Off. Neutral 52.5 - 0.00% ✗ -
Sep 5, 2023 Sep 7, 2023 Mandelia Ashish VP, Chief Accounting Officer Neutral 52.5 - 0.00% ✗ -
Sep 5, 2023 Sep 7, 2023 MISRA TUSHAR SVP, Chief Manuf. Officer Neutral 52.5 - 0.00% ✗ -
Sep 5, 2023 Sep 7, 2023 DeSchuytner Brian CFO Neutral 52.5 - 0.00% ✗ -
Sep 7, 2023 Bala Mohan SVP, Chief Development Officer Neutral 52.5 - 0.00% ✗ -
Aug 16, 2023 Aug 18, 2023 MISRA TUSHAR SVP, Chief Manuf. Officer Sell 30.0 -1,908 -14.22% ✓ $2.3K
Jul 31, 2023 EcoR1 Capital, LLC 10% Owner Neutral 52.5 - 0.00% ✗ -
Jul 3, 2023 Jul 6, 2023 Alleva Lawrence M Director Neutral 52.5 - 0.00% ✗ -
Jul 3, 2023 Jul 6, 2023 Huber Martin H. Jr. Director Neutral 52.5 - 0.00% ✗ -
Jul 3, 2023 Jul 6, 2023 Hege Kristen Director Neutral 52.5 - 0.00% ✗ -
Jul 3, 2023 Jul 6, 2023 Dere Willard H Director Neutral 90.0 +4,217 23.64% ✗ -
Jul 3, 2023 Jul 6, 2023 MOTT DAVID M Director Neutral 77.5 +6,079 1.07% ✗ -
Jun 8, 2023 Jun 12, 2023 Hack Andrew A. F. Director Neutral 55.0 +14,467 0.17% ✗ -
Jun 8, 2023 Jun 12, 2023 Diaz Allene M. Director Neutral 90.0 +14,467 100.00% ✗ -
Jun 8, 2023 Jun 12, 2023 Hege Kristen Director Neutral 90.0 +14,467 100.00% ✗ -
Jun 8, 2023 Jun 12, 2023 Huber Martin H. Jr. Director Neutral 90.0 +14,467 100.00% ✗ -
Jun 8, 2023 Jun 12, 2023 MOTT DAVID M Director Neutral 82.5 +14,467 2.62% ✗ -
Jun 8, 2023 Jun 12, 2023 Alleva Lawrence M Director Neutral 90.0 +14,467 682.41% ✗ -