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MRSN Insider Trading

Insider Ownership Percentage: 13.00%
Insider Buying (Last 12 Months): $0.00
Insider Selling (Last 12 Months): $40,356.02

Mersana Therapeutics Insider Trading History Chart

This chart shows the insider buying and selling history at Mersana Therapeutics by year and by quarter.

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Mersana Therapeutics Share Price & Price History

Current Price: $27.47
Price Change: ▼ Price Decrease of -0.38 (-1.36%)
As of 12/4/2025 05:00 PM ET

This chart shows the closing price history over time for MRSN up to the past year.

Skip Chart and Table DataPrice Data in Insider Trading History Table
Days: 30 | 90 | 365

Mersana Therapeutics Insider Trading History

Transaction DateInsider NameTitleBuy/SellNumber of SharesAverage Share PriceTotal TransactionShares Held After TransactionDetails
10/27/2025Mohan BalaSVPSell77$9.90$762.302,922View SEC Filing Icon  
9/12/2025Martin H Jr. HuberCEOSell2,012$7.31$14,707.729,572View SEC Filing Icon  
1/16/2025Anna ProtopapasDirectorSell345$14.50$5,002.506,721View SEC Filing Icon  
1/16/2025Ashish MandeliaCAOSell142$14.50$2,059.002,300View SEC Filing Icon  
1/16/2025Martin H Jr. HuberCEOSell180$14.50$2,610.004,915View SEC Filing Icon  
1/16/2025Timothy B. LowingerSVPSell321$14.50$4,654.5010,306View SEC Filing Icon  
1/14/2025Anna ProtopapasDirectorSell461$16.50$7,606.505,794View SEC Filing Icon  
1/14/2025Ashish MandeliaCAOSell40$16.50$660.001,975View SEC Filing Icon  
1/14/2025Timothy B. LowingerSVPSell139$16.50$2,293.509,717View SEC Filing Icon  
10/28/2024Mohan BalaSVPSell75$47.50$3,562.502,189View SEC Filing Icon  
10/3/2024Alejandra CarvajalSVPSell223$49.00$10,927.002,548View SEC Filing Icon  
10/2/2024Ashish MandeliaCAOSell194$50.00$9,700.002,044View SEC Filing Icon  
10/2/2024Brian DeschuytnerCFOSell323$50.00$16,150.004,016View SEC Filing Icon  
9/12/2024Martin H Jr. HuberCEOSell2,016$44.00$88,704.004,653View SEC Filing Icon  
1/16/2024Anna ProtopapasDirectorSell1,175$67.75$79,606.255,006View SEC Filing Icon  
1/16/2024Ashish MandeliaCAOSell201$67.75$13,617.75933View SEC Filing Icon  
1/16/2024Brian DeschuytnerCFOSell373$67.75$25,270.752,180View SEC Filing Icon  
1/16/2024Tushar MisraSVPSell134$67.75$9,078.50718View SEC Filing Icon  
10/26/2023Mohan BalaSVPSell76$28.25$2,147.00349View SEC Filing Icon  
8/17/2023Tushar MisraSVPSell76$29.50$2,242.00460View SEC Filing Icon  
4/27/2023Alejandra CarvajalSVPSell157$97.25$15,268.25813View SEC Filing Icon  
1/17/2023Anna ProtopapasCEOSell693$143.50$99,445.501,949View SEC Filing Icon  
1/17/2023Arvin YangSVPSell88$143.50$12,628.001,232View SEC Filing Icon  
1/17/2023Ashish MandeliaVPSell143$143.50$20,520.50544View SEC Filing Icon  
1/17/2023Brian DeschuytnerCFOSell205$143.50$29,417.501,311View SEC Filing Icon  
1/17/2023Tushar MisraCMOSell18$143.50$2,583.00237View SEC Filing Icon  
See Full Table

SEC Filings (Institutional Ownership Changes) for Mersana Therapeutics (NASDAQ:MRSN)

93.92% of Mersana Therapeutics stock is owned by institutions. Institutional ownership can be a sign of analyst confidence in the fundamentals of the stock.

Institutional Buying and Selling by Quarter

This chart shows the instiutional buying and selling at MRSN by year and by quarter.

Skip Institutional Buying and Selling Chart and Table DataRead Chart Data in Institutional Trading History Table

Mersana Therapeutics Institutional Trading History

Reporting DateHedge FundShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
11/17/2025Voleon Capital Management LP13,200$0.10M0.0%N/A0.265%Search for SEC Filing on Google Icon
11/17/2025Millennium Management LLC77,989$0.61M0.0%-96.3%1.563%Search for SEC Filing on Google Icon
11/17/2025Bank of America Corp DE66,397$0.52M0.0%+230.6%1.331%Search for SEC Filing on Google Icon
11/14/2025Schonfeld Strategic Advisors LLC273,579$2.12M0.0%-95.2%5.483%Search for SEC Filing on Google Icon
11/14/2025Two Sigma Investments LP30,688$0.24M0.0%-96.3%0.615%Search for SEC Filing on Google Icon
11/13/2025Mackenzie Financial Corp47,819$0.37M0.0%N/A0.958%Search for SEC Filing on Google Icon
11/7/2025Vanguard Group Inc.302,553$2.35M0.0%-96.1%6.063%Search for SEC Filing on Google Icon
11/7/2025JPMorgan Chase & Co.6,108$47K0.0%-95.3%0.122%Search for SEC Filing on Google Icon
10/15/2025CWM LLC5,756$44K0.0%-96.5%0.115%Search for SEC Filing on Google Icon
10/3/2025Luminus Management LLC50,000$0.39M0.3%-95.2%1.002%Search for SEC Filing on Google Icon
8/15/2025683 Capital Management LLC1,990,000$0.59M0.0%+20.6%39.880%Search for SEC Filing on Google Icon
8/14/2025Jane Street Group LLC511,182$0.15M0.0%N/A10.244%Search for SEC Filing on Google Icon
8/14/2025Qube Research & Technologies Ltd152,877$45K0.0%-87.0%3.064%Search for SEC Filing on Google Icon
8/14/2025Cerity Partners LLC320,805$95K0.0%+31.4%6.429%Search for SEC Filing on Google Icon
8/13/2025Marshall Wace LLP226,971$68K0.0%N/A4.553%Search for SEC Filing on Google Icon
8/12/2025JPMorgan Chase & Co.130,094$39K0.0%+156.6%2.607%Search for SEC Filing on Google Icon
8/8/2025Geode Capital Management LLC1,049,205$0.31M0.0%-57.0%21.026%Search for SEC Filing on Google Icon
6/27/2025Goldman Sachs Group Inc.586,658$0.20M0.0%-26.9%0.471%Search for SEC Filing on Google Icon
5/21/2025Acadian Asset Management LLC2,989,659$1.03M0.0%N/A2.399%Search for SEC Filing on Google Icon
5/16/2025Goldman Sachs Group Inc.586,658$0.20M0.0%-26.9%0.471%Search for SEC Filing on Google Icon
5/16/2025Jacobs Levy Equity Management Inc.1,333,124$0.46M0.0%+19.9%1.070%Search for SEC Filing on Google Icon
5/16/2025AQR Capital Management LLC5,143,749$1.77M0.0%N/A4.127%Search for SEC Filing on Google Icon
5/16/2025683 Capital Management LLC1,650,000$0.57M0.0%+83.3%1.324%Search for SEC Filing on Google Icon
5/15/2025Alamea Verwaltungs GmbH604,213$0.21M0.2%N/A0.485%Search for SEC Filing on Google Icon
5/15/2025State of Wyoming295,498$0.10M0.0%N/A0.237%Search for SEC Filing on Google Icon
5/14/2025Ieq Capital LLC707,021$0.24M0.0%N/A0.567%Search for SEC Filing on Google Icon
5/13/2025Algert Global LLC135,013$46K0.0%+124.7%0.108%Search for SEC Filing on Google Icon
5/12/2025Nuveen LLC232,223$80K0.0%N/A0.186%Search for SEC Filing on Google Icon
5/12/2025Invesco Ltd.114,863$40K0.0%+109.3%0.092%Search for SEC Filing on Google Icon
5/9/2025Charles Schwab Investment Management Inc.280,631$97K0.0%-10.2%0.225%Search for SEC Filing on Google Icon
5/1/2025CWM LLC184,825$64K0.0%+102,580.6%0.148%Search for SEC Filing on Google Icon
4/30/2025Cerity Partners LLC244,235$84K0.0%N/A0.196%Search for SEC Filing on Google Icon
4/16/2025Wealth Enhancement Advisory Services LLC130,700$45K0.0%N/A0.105%Search for SEC Filing on Google Icon
4/14/2025Pallas Capital Advisors LLC94,531$33K0.0%N/A0.076%Search for SEC Filing on Google Icon
3/24/2025Wellington Management Group LLP576,148$0.82M0.0%-6.8%0.462%Search for SEC Filing on Google Icon
2/20/2025Mackenzie Financial Corp91,956$0.13M0.0%N/A0.074%Search for SEC Filing on Google Icon
2/17/2025VR Adviser LLC10,257,790$14.67M1.0%-9.4%8.304%Search for SEC Filing on Google Icon
2/17/2025Two Sigma Investments LP210,876$0.30M0.0%-29.8%0.171%Search for SEC Filing on Google Icon
2/17/2025Two Sigma Advisers LP448,000$0.64M0.0%-8.0%0.363%Search for SEC Filing on Google Icon
2/17/2025Sphera Funds Management LTD.690,272$0.99M0.2%N/A0.559%Search for SEC Filing on Google Icon
2/17/2025Nuveen Asset Management LLC232,223$0.33M0.0%+53.6%0.188%Search for SEC Filing on Google Icon
2/17/2025OCONNOR A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS LLC410,029$0.59M0.0%-28.1%0.332%Search for SEC Filing on Google Icon
2/17/2025Millennium Management LLC795,973$1.14M0.0%+206.4%0.644%Search for SEC Filing on Google Icon
2/17/2025Jacobs Levy Equity Management Inc.1,111,998$1.59M0.0%+12.0%0.900%Search for SEC Filing on Google Icon
2/17/2025D. E. Shaw & Co. Inc.544,463$0.78M0.0%-46.7%0.441%Search for SEC Filing on Google Icon
2/17/2025Deutsche Bank AG839,724$1.20M0.0%-47.4%0.680%Search for SEC Filing on Google Icon
2/17/2025Cubist Systematic Strategies LLC45,296$65K0.0%N/A0.037%Search for SEC Filing on Google Icon
2/17/2025Bank of America Corp DE953,952$1.36M0.0%-3.6%0.772%Search for SEC Filing on Google Icon
2/17/2025BNP Paribas Financial Markets361,147$0.52M0.0%+52.3%0.292%Search for SEC Filing on Google Icon
2/17/2025683 Capital Management LLC900,000$1.29M0.1%+392.4%0.729%Search for SEC Filing on Google Icon
2/17/2025Acuta Capital Partners LLC1,120,500$1.60M1.6%-6.6%0.907%Search for SEC Filing on Google Icon
2/14/2025Boxer Capital Management LLC2,635,000$3.77M0.3%N/A2.133%Search for SEC Filing on Google Icon
2/14/2025Novo Holdings A S4,250,000$6.08M0.4%N/A3.440%Search for SEC Filing on Google Icon
2/14/2025Schonfeld Strategic Advisors LLC2,119,586$3.03M0.0%-4.7%1.716%Search for SEC Filing on Google Icon
2/14/2025Oxford Asset Management LLP65,386$94K0.0%N/A0.053%Search for SEC Filing on Google Icon
2/14/2025Susquehanna Fundamental Investments LLC91,852$0.13M0.0%N/A0.074%Search for SEC Filing on Google Icon
2/14/2025Price T Rowe Associates Inc. MD62,093$89K0.0%-37.3%0.050%Search for SEC Filing on Google Icon
2/14/2025Rock Springs Capital Management LP3,431,684$4.91M0.2%+12.6%2.778%Search for SEC Filing on Google Icon
2/14/2025MetLife Investment Management LLC73,150$0.11M0.0%+115.7%0.059%Search for SEC Filing on Google Icon
2/13/2025XTX Topco Ltd63,530$91K0.0%-81.7%0.051%Search for SEC Filing on Google Icon
2/13/2025Barclays PLC182,711$0.26M0.0%-63.1%0.148%Search for SEC Filing on Google Icon
2/13/2025Renaissance Technologies LLC606,285$0.87M0.0%+23.0%0.491%Search for SEC Filing on Google Icon
2/13/2025Wells Fargo & Company MN67,483$97K0.0%+40.3%0.055%Search for SEC Filing on Google Icon
2/12/2025ExodusPoint Capital Management LP194,153$0.28M0.0%N/A0.157%Search for SEC Filing on Google Icon
2/12/2025Geode Capital Management LLC2,442,250$3.49M0.0%+1.2%1.977%Search for SEC Filing on Google Icon
2/12/2025Wellington Management Group LLP576,148$0.82M0.0%-6.8%0.466%Search for SEC Filing on Google Icon
2/11/2025Sei Investments Co.69,527$99K0.0%N/A0.056%Search for SEC Filing on Google Icon
2/4/2025Los Angeles Capital Management LLC159,760$0.23M0.0%-15.8%0.129%Search for SEC Filing on Google Icon
2/4/2025Bank of New York Mellon Corp346,189$0.50M0.0%-7.0%0.280%Search for SEC Filing on Google Icon
1/24/2025China Universal Asset Management Co. Ltd.26,194$37K0.0%N/A0.021%Search for SEC Filing on Google Icon
1/17/2025SG Americas Securities LLC112,291$0.16M0.0%+28.7%0.091%Search for SEC Filing on Google Icon
1/15/2025Avanza Fonder AB56,298$81K0.0%N/A0.046%Search for SEC Filing on Google Icon
12/26/2024JPMorgan Chase & Co.2,351,359$4.44M0.0%+18.9%1.903%Search for SEC Filing on Google Icon
12/13/2024Exome Asset Management LLC1,178,570$2.23M1.5%N/A0.954%Search for SEC Filing on Google Icon
11/19/2024Barclays PLC494,516$0.93M0.0%+32.7%0.400%Search for SEC Filing on Google Icon
11/16/2024Geode Capital Management LLC2,413,215$4.56M0.0%-3.2%1.967%Search for SEC Filing on Google Icon
11/15/2024Barclays PLC494,516$0.93M0.0%+32.7%0.403%Search for SEC Filing on Google Icon
11/15/2024XTX Topco Ltd347,255$0.66M0.0%+186.0%0.283%Search for SEC Filing on Google Icon
11/15/2024Wellington Management Group LLP618,305$1.17M0.0%+16.0%0.504%Search for SEC Filing on Google Icon
11/15/2024State Street Corp2,725,394$5.15M0.0%+1.6%2.222%Search for SEC Filing on Google Icon
11/15/2024Quarry LP30,000$57K0.0%N/A0.024%Search for SEC Filing on Google Icon
11/15/2024Jacobs Levy Equity Management Inc.993,046$1.88M0.0%+104.5%0.809%Search for SEC Filing on Google Icon
11/15/2024Atom Investors LP24,661$47K0.0%-93.3%0.020%Search for SEC Filing on Google Icon
11/14/2024Verition Fund Management LLC1,303,249$2.46M0.0%+11,695.2%1.062%Search for SEC Filing on Google Icon
11/14/2024Acuta Capital Partners LLC1,200,000$2.27M1.8%-27.8%0.978%Search for SEC Filing on Google Icon
11/14/2024MetLife Investment Management LLC33,916$64K0.0%-48.3%0.028%Search for SEC Filing on Google Icon
11/13/2024BNP Paribas Financial Markets237,198$0.45M0.0%-29.4%0.193%Search for SEC Filing on Google Icon
11/13/2024FMR LLC277,740$0.53M0.0%+13.2%0.226%Search for SEC Filing on Google Icon
11/13/2024Dynamic Technology Lab Private Ltd18,095$34K0.0%N/A0.015%Search for SEC Filing on Google Icon
11/12/2024HealthInvest Partners AB538,621$1.02M0.5%+191.3%0.439%Search for SEC Filing on Google Icon
11/9/2024Intech Investment Management LLC27,342$52K0.0%N/A0.022%Search for SEC Filing on Google Icon
11/5/2024GSA Capital Partners LLP271,774$0.51M0.0%+368.9%0.222%Search for SEC Filing on Google Icon
11/4/2024Los Angeles Capital Management LLC189,660$0.36M0.0%+8.1%0.155%Search for SEC Filing on Google Icon
10/28/2024US Bancorp DE16,178$31K0.0%N/A0.013%Search for SEC Filing on Google Icon
10/10/2024Exchange Traded Concepts LLC85,006$0.16M0.0%+95.8%0.069%Search for SEC Filing on Google Icon
10/3/2024SG Americas Securities LLC87,233$0.17M0.0%-37.1%0.071%Search for SEC Filing on Google Icon
8/16/2024Algert Global LLC44,655$90K0.0%N/A0.036%Search for SEC Filing on Google Icon
8/15/2024Susquehanna Fundamental Investments LLC308,691$0.62M0.0%+31.9%0.252%Search for SEC Filing on Google Icon
8/15/2024Affinity Asset Advisors LLC767,000$1.54M0.2%-23.3%0.627%Search for SEC Filing on Google Icon
8/14/2024Squarepoint Ops LLC252,804$0.51M0.0%N/A0.207%Search for SEC Filing on Google Icon
Data available starting January 2016

See Full Table
Mersana Therapeutics logo
Mersana Therapeutics, Inc., a clinical stage biopharmaceutical company, develops antibody drug conjugates (ADC) for cancer patients with unmet needs. The company develops XMT-1660, a B7-H4-targeted Dolasynthen ADC candidate; and XMT-2056, an immunosynthen ADC. It has research and development collaborations with Janssen Biotech, Inc., Ares Trading S.A., Merck KGaA, and Asana BioSciences, LLC for the development of ADC product candidates. The company was formerly known as Nanopharma Corp. and changed its name to Mersana Therapeutics, Inc. in November 2005. Mersana Therapeutics, Inc. was incorporated in 2001 and is headquartered in Cambridge, Massachusetts.
Read More on Mersana Therapeutics

Today's Range

Now: $27.47
Low: $27.31
High: $28.36

50 Day Range

MA: $15.01
Low: $7.57
High: $27.92

52 Week Range

Now: $27.47
Low: $5.21
High: $70.73

Volume

70,525 shs

Average Volume

233,076 shs

Market Capitalization

$137.35 million

P/E Ratio

N/A

Dividend Yield

N/A

Beta

0.45

Who are the company insiders with the largest holdings of Mersana Therapeutics?

Mersana Therapeutics' top insider investors include:
  1. Timothy B Lowinger (SVP)
  2. Martin H Jr Huber (CEO)
  3. Anna Protopapas (Director)
  4. Brian Deschuytner (CFO)
  5. Mohan Bala (SVP)
  6. Alejandra Carvajal (SVP)
  7. Ashish Mandelia (CAO)
  8. Tushar Misra (SVP)
Learn More about top insider investors at Mersana Therapeutics.

Who are the major institutional investors of Mersana Therapeutics?

Mersana Therapeutics' top institutional shareholders include:
  1. Vanguard Group Inc. — 6.06%
  2. Schonfeld Strategic Advisors LLC — 5.48%
  3. Millennium Management LLC — 1.56%
  4. Bank of America Corp DE — 1.33%
  5. Luminus Management LLC — 1.00%
  6. Mackenzie Financial Corp — 0.96%
Learn More about top institutional investors of Mersana Therapeutics stock.

Which major investors are selling Mersana Therapeutics stock?

In the previous quarter, MRSN stock was sold by these institutional investors:
  1. Vanguard Group Inc.
  2. Schonfeld Strategic Advisors LLC
  3. Millennium Management LLC
  4. Luminus Management LLC
  5. Two Sigma Investments LP
  6. CWM LLC
  7. JPMorgan Chase & Co.
  8. Citadel Advisors LLC
In the previous year, company insiders that have sold Mersana Therapeutics company stock include:
  1. Timothy B Lowinger (SVP)
  2. Martin H Jr Huber (CEO)
  3. Anna Protopapas (Director)
  4. Brian Deschuytner (CFO)
  5. Mohan Bala (SVP)
Learn More investors selling Mersana Therapeutics stock.

Which major investors are buying Mersana Therapeutics stock?

In the last quarter, MRSN stock was bought by institutional investors including:
  1. Mackenzie Financial Corp
  2. Bank of America Corp DE
  3. Voleon Capital Management LP