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United States Biotechnology & Medical Research

Mersana Therapeutics Inc (MRSN)

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Ticker: MRSN Exchange: NSM
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• Purchase • Sale • Planned purchase • Planned sale Net purchase Net sale Activity signal Earnings
Top insiders
Trades
Bala Mohan
SVP, Chief Development Officer
1 sale — total 762 USD
Planned sale 27 Oct 2025
Value US$259,341.72 | Price 368.37 | Shares 65,163
Planned sale 12 Sep 2025
Value US$4,805,947.15 | Price 85.97 | Shares 89,464
Proposed sale 16 Jan 2025
Value US$4,909.28 | Price 0.61 | Shares 8,048
Proposed sale 16 Jan 2025
Value US$5,166.70 | Price 0.61 | Shares 8,470
Proposed sale 16 Jan 2025
Value US$3,108.56 | Price 0.61 | Shares 5,096
Proposed sale 16 Jan 2025
Value US$3,622.79 | Price 0.61 | Shares 5,939
Proposed sale 16 Jan 2025
Value US$5,268.57 | Price 0.61 | Shares 8,637
Planned sale 16 Jan 2025
Value US$4,667.84 | Price 0.58 | Shares 8,048
Planned sale 16 Jan 2025
Value US$2,061.32 | Price 0.58 | Shares 3,554
Planned sale 16 Jan 2025
Value US$2,618.12 | Price 0.58 | Shares 4,514
Planned sale 16 Jan 2025
Value US$4,912.60 | Price 0.58 | Shares 8,470
Planned sale 16 Jan 2025
Value US$5,009.46 | Price 0.58 | Shares 8,637
Planned sale 16 Jan 2025
Value US$3,444.62 | Price 0.58 | Shares 5,939
Planned sale 16 Jan 2025
Value US$2,955.68 | Price 0.58 | Shares 5,096
Proposed sale 15 Jan 2025
Value US$3,962.24 | Price 0.64 | Shares 6,191
Planned sale 15 Jan 2025
Value US$3,900.33 | Price 0.63 | Shares 6,191
Proposed sale 15 Jan 2025
Value US$1,148.16 | Price 0.64 | Shares 1,794
Planned sale 15 Jan 2025
Value US$1,130.22 | Price 0.63 | Shares 1,794
Proposed sale 15 Jan 2025
Value US$1,491.84 | Price 0.64 | Shares 2,331
Planned sale 15 Jan 2025
Value US$1,468.53 | Price 0.63 | Shares 2,331
Planned sale 15 Jan 2025
Value US$599.76 | Price 0.63 | Shares 952
Planned sale 15 Jan 2025
Value US$1,128.33 | Price 0.63 | Shares 1,791
Proposed sale 14 Jan 2025
Value US$2,049.39 | Price 0.63 | Shares 3,253
Proposed sale 14 Jan 2025
Value US$7,266.42 | Price 0.63 | Shares 11,534
Planned sale 14 Jan 2025
Value US$7,612.44 | Price 0.66 | Shares 11,534
Planned sale 14 Jan 2025
Value US$2,298.78 | Price 0.66 | Shares 3,483
Planned sale 14 Jan 2025
Value US$2,450.58 | Price 0.66 | Shares 3,713
Planned sale 14 Jan 2025
Value US$2,197.80 | Price 0.66 | Shares 3,330
Planned sale 14 Jan 2025
Value US$664.62 | Price 0.66 | Shares 1,007
Planned sale 14 Jan 2025
Value US$2,146.98 | Price 0.66 | Shares 3,253
Proposed sale 28 Oct 2024
Value US$3,843.36 | Price 2.04 | Shares 1,884
Planned sale 28 Oct 2024
Value US$3,579.60 | Price 1.90 | Shares 1,884
Proposed sale 3 Oct 2024
Value US$11,307.96 | Price 2.02 | Shares 5,598
Proposed sale 3 Oct 2024
Value US$11,307.96 | Price 2.02 | Shares 5,598
Proposed sale 3 Oct 2024
Value US$11,307.96 | Price 2.02 | Shares 5,598
Proposed sale 3 Oct 2024
Value US$11,307.96 | Price 2.02 | Shares 5,598
Planned sale 3 Oct 2024
Value US$10,972.08 | Price 1.96 | Shares 5,598
Planned sale 3 Oct 2024
Value US$6,587.56 | Price 1.96 | Shares 3,361
Planned sale 3 Oct 2024
Value US$10,972.08 | Price 1.96 | Shares 5,598
Planned sale 3 Oct 2024
Value US$10,972.08 | Price 1.96 | Shares 5,598
Planned sale 3 Oct 2024
Value US$10,972.08 | Price 1.96 | Shares 5,598
Proposed sale 2 Oct 2024
Value US$16,339.78 | Price 2.02 | Shares 8,089
Proposed sale 2 Oct 2024
Value US$16,339.78 | Price 2.02 | Shares 8,089
Proposed sale 2 Oct 2024
Value US$16,339.78 | Price 2.02 | Shares 8,089
Proposed sale 2 Oct 2024
Value US$16,339.78 | Price 2.02 | Shares 8,089
Planned sale 2 Oct 2024
Value US$16,178.00 | Price 2.00 | Shares 8,089
Planned sale 2 Oct 2024
Value US$9,710.00 | Price 2.00 | Shares 4,855
Planned sale 2 Oct 2024
Value US$16,178.00 | Price 2.00 | Shares 8,089
Planned sale 2 Oct 2024
Value US$16,178.00 | Price 2.00 | Shares 8,089
Planned sale 2 Oct 2024
Value US$16,178.00 | Price 2.00 | Shares 8,089
Proposed sale 12 Sep 2024
Value US$89,248.71 | Price 1.77 | Shares 50,423
Planned sale 12 Sep 2024
Value US$88,744.48 | Price 1.76 | Shares 50,423
Planned sale 16 Jan 2024
Value US$11,872.51 | Price 2.71 | Shares 4,381
Planned sale 16 Jan 2024
Value US$28,208.39 | Price 2.71 | Shares 10,409
Planned sale 16 Jan 2024
Value US$9,097.47 | Price 2.71 | Shares 3,357
Planned sale 16 Jan 2024
Value US$79,671.29 | Price 2.71 | Shares 29,399
Planned sale 16 Jan 2024
Value US$25,276.17 | Price 2.71 | Shares 9,327
Planned sale 16 Jan 2024
Value US$9,298.01 | Price 2.71 | Shares 3,431
Planned sale 16 Jan 2024
Value US$13,617.75 | Price 2.71 | Shares 5,025
Proposed sale 16 Jan 2024
Value US$10,361.62 | Price 3.02 | Shares 3,431
Proposed sale 16 Jan 2024
Value US$31,435.18 | Price 3.02 | Shares 10,409
Proposed sale 16 Jan 2024
Value US$28,167.54 | Price 3.02 | Shares 9,327
Proposed sale 16 Jan 2024
Value US$88,784.98 | Price 3.02 | Shares 29,399
Planned sale 26 Oct 2023
Value US$2,160.56 | Price 1.13 | Shares 1,912
Planned sale 17 Aug 2023
Value US$2,251.44 | Price 1.18 | Shares 1,908
Planned sale 27 Apr 2023
Value US$15,342.16 | Price 3.89 | Shares 3,944
Sale 17 Jan 2023
Value US$20,520.50 | Price 5.74 | Shares 3,575
Sale 17 Jan 2023
Value US$4,488.68 | Price 5.74 | Shares 782
Sale 17 Jan 2023
Value US$12,679.66 | Price 5.74 | Shares 2,209
Sale 17 Jan 2023
Value US$99,566.04 | Price 5.74 | Shares 17,346
Sale 17 Jan 2023
Value US$29,451.94 | Price 5.74 | Shares 5,131
Sale 17 Jan 2023
Value US$35,777.42 | Price 5.74 | Shares 6,233
Sale 17 Jan 2023
Value US$2,628.92 | Price 5.74 | Shares 458
Sale 1 Dec 2022
Value US$36,422.93 | Price 6.59 | Shares 5,527
Sale 17 Aug 2022
Value US$13,340.90 | Price 7.10 | Shares 1,879
Abbreviations B: Buy, S: Sell, PP: Planned purchase, PlS: Planned sale, PrS: Proposed sale, O: Option / Other
Notification date Transaction date B/S Transaction type Insider and/or position Nb. shares
Price
Value 		Number of shares Price Value Details
2025-10-28 2025-10-27 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
65,163 -25.0%
368.37
US$259,342 		65,163 -25.0% 368.37 US$259,342
2025-09-15 2025-09-12 PlS Planned sale
3.2
Huber Martin H. Jr.

President, CEO

Executive Director
89,464 +10.8%
85.97
US$4,805,947 		89,464 +10.8% 85.97 US$4,805,947
2025-01-17 2025-01-16 PrS Proposed sale
3.8
Timothy B. Lowinger

Officer

Officer
63,314
313.10
US$1,578,465 		63,314 313.10 US$1,578,465
2025-01-17 2025-01-16 PrS Proposed sale
1.5
Brian DeSchuytner

Officer

Officer
8,470
0.61
US$5,167 		8,470 0.61 US$5,167
2025-01-17 2025-01-16 PrS Proposed sale
1.9
Alejandra Carvajal

Officer

Officer
5,096
0.61
US$3,109 		5,096 0.61 US$3,109
2025-01-17 2025-01-16 PrS Proposed sale
Mohan Bala

Officer

Officer
5,939
0.61
US$3,623 		5,939 0.61 US$3,623
2025-01-17 2025-01-16 PrS Proposed sale
2.6
Anna Protopapas

Director

Non-Executive Director
8,637
0.61
US$5,269 		8,637 0.61 US$5,269
2025-01-17 2025-01-16 PlS Planned sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Officer

Officer
8,048 -3.0%
0.58
US$4,668 		8,048 -3.0% 0.58 US$4,668
2025-01-17 2025-01-16 PlS Planned sale
2.8
Mandelia Ashish

VP, Chief Accounting Officer

Officer
3,554 -5.8%
0.58
US$2,061 		3,554 -5.8% 0.58 US$2,061
2025-01-17 2025-01-16 PlS Planned sale
3.2
Huber Martin H. Jr.

President, CEO

Executive Director
4,514 -3.5%
0.58
US$2,618 		4,514 -3.5% 0.58 US$2,618
2025-01-17 2025-01-16 PlS Planned sale
1.5
DeSchuytner Brian

SVP, COO & CFO

Officer
8,470 -6.5%
0.58
US$4,913 		8,470 -6.5% 0.58 US$4,913
2025-01-17 2025-01-16 PlS Planned sale
2.6
Protopapas Anna
Non-Executive Director
8,637 -4.9%
0.58
US$5,009 		8,637 -4.9% 0.58 US$5,009
2025-01-17 2025-01-16 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
5,939 -7.9%
0.58
US$3,445 		5,939 -7.9% 0.58 US$3,445
2025-01-17 2025-01-16 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
5,096 -6.1%
0.58
US$2,956 		5,096 -6.1% 0.58 US$2,956
2025-01-16 2025-01-15 PrS Proposed sale
2.6
Protopapas Anna

Director

Non-Executive Director
6,191
0.64
US$3,962 		6,191 0.64 US$3,962
2025-01-16 2025-01-15 PrS Proposed sale
3.8
Lowinger Timothy B

Officer

Officer
1,794
0.64
US$1,148 		1,794 0.64 US$1,148
2025-01-16 2025-01-15 PrS Proposed sale
1.5
DeSchuytner Brian

Officer

Officer
2,331
0.64
US$1,492 		2,331 0.64 US$1,492
2025-01-16 2025-01-15 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
952 -1.3%
0.63
US$600 		952 -1.3% 0.63 US$600
2025-01-16 2025-01-15 PlS Planned sale
1.5
DeSchuytner Brian

SVP, COO & CFO

Officer
2,331 -2.1%
0.63
US$1,469 		2,331 -2.1% 0.63 US$1,469
2025-01-16 2025-01-15 PlS Planned sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Officer

Officer
1,794 -0.7%
0.63
US$1,130 		1,794 -0.7% 0.63 US$1,130
2025-01-16 2025-01-15 PlS Planned sale
2.6
Protopapas Anna
Non-Executive Director
6,191 -3.8%
0.63
US$3,900 		6,191 -3.8% 0.63 US$3,900
2025-01-16 2025-01-15 PlS Planned sale
2.8
Mandelia Ashish

VP, Chief Accounting Officer

Officer
1,791 -3.3%
0.63
US$1,128 		1,791 -3.3% 0.63 US$1,128
2025-01-17 2025-01-14 PrS Proposed sale
Mohan Bala

Officer

Officer
3,253
0.63
US$2,049 		3,253 0.63 US$2,049
2025-01-15 2025-01-14 PrS Proposed sale
2.6
Protopapas Anna

Director

Non-Executive Director
11,534
0.63
US$7,266 		11,534 0.63 US$7,266
2025-01-15 2025-01-14 PlS Planned sale
2.6
Protopapas Anna
Non-Executive Director
11,534 -7.4%
0.66
US$7,612 		11,534 -7.4% 0.66 US$7,612
2025-01-15 2025-01-14 PlS Planned sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Officer

Officer
3,483 -1.4%
0.66
US$2,299 		3,483 -1.4% 0.66 US$2,299
2025-01-15 2025-01-14 PlS Planned sale
1.5
DeSchuytner Brian

SVP, COO & CFO

Officer
3,713 -3.4%
0.66
US$2,451 		3,713 -3.4% 0.66 US$2,451
2025-01-15 2025-01-14 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
3,330 -4.6%
0.66
US$2,198 		3,330 -4.6% 0.66 US$2,198
2025-01-15 2025-01-14 PlS Planned sale
2.8
Mandelia Ashish

VP, Chief Accounting Officer

Officer
1,007 -2.0%
0.66
US$665 		1,007 -2.0% 0.66 US$665
2025-01-15 2025-01-14 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
3,253 -5.1%
0.66
US$2,147 		3,253 -5.1% 0.66 US$2,147
2024-10-29 2024-10-28 PrS Proposed sale
Bala, Mohan

Officer

Officer
1,884
2.04
US$3,843 		1,884 2.04 US$3,843
2024-10-29 2024-10-28 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
1,884 -3.3%
1.90
US$3,580 		1,884 -3.3% 1.90 US$3,580
2024-10-07 2024-10-03 PrS Proposed sale
Bala, Mohan

Officer

Officer
5,598
2.02
US$11,308 		5,598 2.02 US$11,308
2024-10-07 2024-10-03 PrS Proposed sale
1.9
Carvajal, Alejandra

Officer

Officer
5,598
2.02
US$11,308 		5,598 2.02 US$11,308
2024-10-07 2024-10-03 PrS Proposed sale
1.5
Brian DeSchuytner

Officer

Officer
5,598
2.02
US$11,308 		5,598 2.02 US$11,308
2024-10-07 2024-10-03 PrS Proposed sale
3.8
Timothy B. Lowinger

Officer

Officer
5,598
2.02
US$11,308 		5,598 2.02 US$11,308
2024-10-07 2024-10-03 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
5,598 -8.1%
1.96
US$10,972 		5,598 -8.1% 1.96 US$10,972
2024-10-07 2024-10-03 PlS Planned sale
2.8
Mandelia Ashish

VP, Chief Accounting Officer

Officer
3,361 -6.6%
1.96
US$6,588 		3,361 -6.6% 1.96 US$6,588
2024-10-07 2024-10-03 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
5,598 -10.0%
1.96
US$10,972 		5,598 -10.0% 1.96 US$10,972
2024-10-07 2024-10-03 PlS Planned sale
1.5
DeSchuytner Brian

SVP, COO & CFO

Officer
5,598 -5.6%
1.96
US$10,972 		5,598 -5.6% 1.96 US$10,972
2024-10-07 2024-10-03 PlS Planned sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Officer

Officer
5,598 -2.3%
1.96
US$10,972 		5,598 -2.3% 1.96 US$10,972
2024-10-07 2024-10-02 PrS Proposed sale
Bala, Mohan

Officer

Officer
8,089
2.02
US$16,340 		8,089 2.02 US$16,340
2024-10-07 2024-10-02 PrS Proposed sale
1.9
Carvajal, Alejandra

Officer

Officer
8,089
2.02
US$16,340 		8,089 2.02 US$16,340
2024-10-07 2024-10-02 PrS Proposed sale
1.5
Brian DeSchuytner

Officer

Officer
8,089
2.02
US$16,340 		8,089 2.02 US$16,340
2024-10-07 2024-10-02 PrS Proposed sale
3.8
Timothy B. Lowinger

Officer

Officer
8,089
2.02
US$16,340 		8,089 2.02 US$16,340
2024-10-07 2024-10-02 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
8,089 -10.5%
2.00
US$16,178 		8,089 -10.5% 2.00 US$16,178
2024-10-07 2024-10-02 PlS Planned sale
2.8
Mandelia Ashish

VP, Chief Accounting Officer

Officer
4,855 -8.7%
2.00
US$9,710 		4,855 -8.7% 2.00 US$9,710
2024-10-07 2024-10-02 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
8,089 -12.6%
2.00
US$16,178 		8,089 -12.6% 2.00 US$16,178
2024-10-07 2024-10-02 PlS Planned sale
1.5
DeSchuytner Brian

SVP, COO & CFO

Officer
8,089 -7.5%
2.00
US$16,178 		8,089 -7.5% 2.00 US$16,178
2024-10-07 2024-10-02 PlS Planned sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Officer

Officer
8,089 -3.2%
2.00
US$16,178 		8,089 -3.2% 2.00 US$16,178
2024-09-13 2024-09-12 PrS Proposed sale
3.2
Huber, Martin H. Jr.

Officer, Director

Executive Director
50,423
1.77
US$89,249 		50,423 1.77 US$89,249
2024-09-13 2024-09-12 PlS Planned sale
3.2
Huber Martin H. Jr.

President, CEO

Executive Director
50,423 -30.2%
1.76
US$88,744 		50,423 -30.2% 1.76 US$88,744
2024-01-17 2024-01-16 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
4,381 -13.8%
2.71
US$11,873 		4,381 -13.8% 2.71 US$11,873
2024-01-17 2024-01-16 PlS Planned sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Officer

Officer
10,409 -5.0%
2.71
US$28,208 		10,409 -5.0% 2.71 US$28,208
2024-01-17 2024-01-16 PlS Planned sale
2.3
MISRA TUSHAR

SVP, Chief Manuf. Officer

Officer
3,357 -15.7%
2.71
US$9,097 		3,357 -15.7% 2.71 US$9,097
2024-01-17 2024-01-16 PlS Planned sale
2.6
Protopapas Anna
Non-Executive Director
29,399 -19.0%
2.71
US$79,671 		29,399 -19.0% 2.71 US$79,671
2024-01-17 2024-01-16 PlS Planned sale
1.5
DeSchuytner Brian

SVP, COO & CFO

Officer
9,327 -14.6%
2.71
US$25,276 		9,327 -14.6% 2.71 US$25,276
2024-01-17 2024-01-16 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
3,431 -19.6%
2.71
US$9,298 		3,431 -19.6% 2.71 US$9,298
2024-01-17 2024-01-16 PlS Planned sale
2.8
Mandelia Ashish

VP, Chief Accounting Officer

Officer
5,025 -17.7%
2.71
US$13,618 		5,025 -17.7% 2.71 US$13,618
2024-01-16 2024-01-16 PrS Proposed sale
Bala, Mohan

Officer

Officer
3,431
3.02
US$10,362 		3,431 3.02 US$10,362
2024-01-16 2024-01-16 PrS Proposed sale
3.8
Timothy B. Lowinger

Officer

Officer
10,409
3.02
US$31,435 		10,409 3.02 US$31,435
2024-01-16 2024-01-16 PrS Proposed sale
1.5
Brian DeSchuytner

Officer

Officer
9,327
3.02
US$28,168 		9,327 3.02 US$28,168
2024-01-16 2024-01-16 PrS Proposed sale
2.6
Anna Protopapas

Director

Non-Executive Director
29,399
3.02
US$88,785 		29,399 3.02 US$88,785
2023-10-27 2023-10-26 PlS Planned sale
Bala Mohan

SVP, Chief Development Officer

Officer
1,912 -18.0%
1.13
US$2,161 		1,912 -18.0% 1.13 US$2,161
2023-08-18 2023-08-17 PlS Planned sale
2.3
MISRA TUSHAR

SVP, Chief Manuf. Officer

Officer
1,908 -14.2%
1.18
US$2,251 		1,908 -14.2% 1.18 US$2,251
2023-04-28 2023-04-27 PlS Planned sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
3,944 -16.3%
3.89
US$15,342 		3,944 -16.3% 3.89 US$15,342
2023-01-18 2023-01-17 S Sale
2.8
Mandelia Ashish

VP, Controller

Officer
3,575 -20.8%
5.74
US$20,520 		3,575 -20.8% 5.74 US$20,520
2023-01-18 2023-01-17 S Sale
1.9
Carvajal Alejandra

SVP, Chief Legal Officer

Officer
782 -6.6%
5.74
US$4,489 		782 -6.6% 5.74 US$4,489
2023-01-18 2023-01-17 S Sale
3.7
Yang Arvin

SVP, Chief Medical Officer

Officer
2,209 -6.7%
5.74
US$12,680 		2,209 -6.7% 5.74 US$12,680
2023-01-18 2023-01-17 S Sale
2.6
Protopapas Anna

President & CEO

Executive Director
17,346 -26.3%
5.74
US$99,566 		17,346 -26.3% 5.74 US$99,566
2023-01-18 2023-01-17 S Sale
1.5
DeSchuytner Brian

SVP, Chief Financial Officer

Officer
5,131 -13.5%
5.74
US$29,452 		5,131 -13.5% 5.74 US$29,452
2023-01-18 2023-01-17 S Sale
3.8
Lowinger Timothy B

SVP, Chief Sci.&Tech. Off.

Officer
6,233 -3.3%
5.74
US$35,777 		6,233 -3.3% 5.74 US$35,777
2023-01-18 2023-01-17 S Sale
2.3
MISRA TUSHAR

SVP, CMO

Officer
458 -7.2%
5.74
US$2,629 		458 -7.2% 5.74 US$2,629
2022-12-02 2022-12-01 S Sale
3.7
Yang Arvin

Chief Medical Officer

Officer
5,527 -17.6%
6.59
US$36,423 		5,527 -17.6% 6.59 US$36,423
2022-08-18 2022-08-17 S Sale
2.3
MISRA TUSHAR

Chief Manufacturing Officer

Officer
1,879 -30.1%
7.10
US$13,341 		1,879 -30.1% 7.10 US$13,341
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