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Mersana Therapeutics (MRSN) Institutional Ownership

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Institutional Ownership Changes (13F Filings) for Mersana Therapeutics (NASDAQ:MRSN)

Current
Institutional Ownership
Percentage
93.92%
Number of
Institutional Buyers
(last 12 months)
20
Total
Institutional Inflows
(last 12 months)
$22.86M
Number of
Institutional Sellers
(last 12 months)
15
Total
Institutional Outflows
(last 12 months)
$164.78M
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MRSN Institutional Buying and Selling by Quarter

Mersana Therapeutics Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
2/18/2026 Mackenzie Financial Corp33,834$967K0.0%-29.2%0.677%
2/18/2026 XTX Topco Ltd11,948$346K0.0%N/A0.239%
2/18/2026 Millennium Management LLC63,305$1.83M0.0%-18.8%1.266%
2/17/2026 AQR Capital Management LLC37,264$1.08M0.0%-20.2%0.745%
2/16/2026 OMERS ADMINISTRATION Corp7,900$229K0.0%N/A0.158%
2/16/2026 Yakira Capital Management Inc.32,663$945K0.3%N/A0.653%
2/16/2026 Alamea Verwaltungs GmbH24,165$699K0.5%-94.4%0.483%
2/13/2026 Affinity Asset Advisors LLC100,000$2.89M0.2%N/A2.000%
2/13/2026 State Street Corp19,543$565K0.0%-34.5%0.391%
2/13/2026 Ieq Capital LLC12,955$375K0.0%-15.0%0.259%
2/12/2026 Groupe la Francaise61,488$1.78M0.0%N/A1.230%
2/12/2026 Knott David M Jr111,686$3.23M1.5%N/A2.234%
2/12/2026 Mint Tower Capital Management B.V.1,035$30K0.0%N/A0.021%
2/9/2026 Geode Capital Management LLC43,920$1.27M0.0%+5.5%0.879%
2/5/2026 Gamco Investors INC. ET AL10,000$289K0.0%N/A0.200%
2/5/2026 Gabelli Funds LLC47,300$1.37M0.0%N/A0.946%
2/3/2026 Credit Industriel ET Commercial41,392$1.20M0.1%N/A0.828%
1/29/2026 Deltec Asset Management LLC18,000$521K0.1%N/A0.360%
1/26/2026 CWM LLC2,286$66K0.0%-60.3%0.046%
1/1/2026 JPMorgan Chase & Co.6,108$47K0.0%-95.3%0.122%
11/17/2025 Voleon Capital Management LP13,200$102K0.0%N/A0.265%
11/17/2025 Millennium Management LLC77,989$605K0.0%-96.3%1.563%
11/17/2025 Bank of America Corp DE66,397$515K0.0%+230.6%1.331%
11/14/2025 Schonfeld Strategic Advisors LLC273,579$2.12M0.0%-95.2%5.483%
11/14/2025 Two Sigma Investments LP30,688$238K0.0%-96.3%0.615%
11/13/2025 Mackenzie Financial Corp47,819$371K0.0%N/A0.958%
11/7/2025Vanguard Group Inc.302,553$2.35M0.0%-96.1%6.063%
11/7/2025 JPMorgan Chase & Co.6,108$47K0.0%-95.3%0.122%
10/15/2025 CWM LLC5,756$44K0.0%-96.5%0.115%
10/3/2025 Luminus Management LLC50,000$388K0.3%-95.2%1.002%
8/15/2025 683 Capital Management LLC1,990,000$589K0.0%+20.6%39.880%
8/14/2025 Jane Street Group LLC511,182$151K0.0%N/A10.244%
8/14/2025 Qube Research & Technologies Ltd152,877$45K0.0%-87.0%3.064%
8/14/2025 Cerity Partners LLC320,805$95K0.0%+31.4%6.429%
8/13/2025 Marshall Wace LLP226,971$68K0.0%N/A4.553%
8/12/2025 JPMorgan Chase & Co.130,094$39K0.0%+156.6%2.607%
8/8/2025 Geode Capital Management LLC1,049,205$311K0.0%-57.0%21.026%
6/27/2025 Goldman Sachs Group Inc.586,658$202K0.0%-26.9%0.471%
5/21/2025Acadian Asset Management LLC2,989,659$1.03M0.0%N/A2.399%
5/16/2025Goldman Sachs Group Inc.586,658$202K0.0%-26.9%0.471%
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5/16/2025Jacobs Levy Equity Management Inc.1,333,124$459K0.0%+19.9%1.070%
5/16/2025AQR Capital Management LLC5,143,749$1.77M0.0%N/A4.127%
5/16/2025683 Capital Management LLC1,650,000$568K0.0%+83.3%1.324%
5/15/2025Alamea Verwaltungs GmbH604,213$208K0.2%N/A0.485%
5/15/2025State of Wyoming295,498$102K0.0%N/A0.237%
5/14/2025Ieq Capital LLC707,021$243K0.0%N/A0.567%
5/13/2025Algert Global LLC135,013$46K0.0%+124.7%0.108%
5/12/2025Nuveen LLC232,223$80K0.0%N/A0.186%
5/12/2025Invesco Ltd.114,863$40K0.0%+109.3%0.092%
5/9/2025Charles Schwab Investment Management Inc.280,631$97K0.0%-10.2%0.225%
5/1/2025CWM LLC184,825$64K0.0%+102,580.6%0.148%
4/30/2025Cerity Partners LLC244,235$84K0.0%N/A0.196%
4/16/2025Wealth Enhancement Advisory Services LLC130,700$45K0.0%N/A0.105%
4/14/2025Pallas Capital Advisors LLC94,531$33K0.0%N/A0.076%
3/24/2025Wellington Management Group LLP576,148$824K0.0%-6.8%0.462%
2/20/2025Mackenzie Financial Corp91,956$131K0.0%N/A0.074%
2/17/2025VR Adviser LLC10,257,790$14.67M1.0%-9.4%8.304%
2/17/2025Two Sigma Investments LP210,876$302K0.0%-29.8%0.171%
2/17/2025Two Sigma Advisers LP448,000$641K0.0%-8.0%0.363%
2/17/2025Sphera Funds Management LTD.690,272$987K0.2%N/A0.559%
2/17/2025Nuveen Asset Management LLC232,223$332K0.0%+53.6%0.188%
2/17/2025OCONNOR A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS LLC410,029$586K0.0%-28.1%0.332%
2/17/2025Millennium Management LLC795,973$1.14M0.0%+206.4%0.644%
2/17/2025Jacobs Levy Equity Management Inc.1,111,998$1.59M0.0%+12.0%0.900%
2/17/2025D. E. Shaw & Co. Inc.544,463$779K0.0%-46.7%0.441%
2/17/2025Deutsche Bank AG839,724$1.20M0.0%-47.4%0.680%
2/17/2025Cubist Systematic Strategies LLC45,296$65K0.0%N/A0.037%
2/17/2025Bank of America Corp DE953,952$1.36M0.0%-3.6%0.772%
2/17/2025BNP Paribas Financial Markets361,147$516K0.0%+52.3%0.292%
2/17/2025683 Capital Management LLC900,000$1.29M0.1%+392.4%0.729%
2/17/2025Acuta Capital Partners LLC1,120,500$1.60M1.6%-6.6%0.907%
2/14/2025Boxer Capital Management LLC2,635,000$3.77M0.3%N/A2.133%
2/14/2025Novo Holdings A S4,250,000$6.08M0.4%N/A3.440%
2/14/2025Schonfeld Strategic Advisors LLC2,119,586$3.03M0.0%-4.7%1.716%
2/14/2025Oxford Asset Management LLP65,386$94K0.0%N/A0.053%
2/14/2025Susquehanna Fundamental Investments LLC91,852$131K0.0%N/A0.074%
2/14/2025Price T Rowe Associates Inc. MD62,093$89K0.0%-37.3%0.050%
2/14/2025Rock Springs Capital Management LP3,431,684$4.91M0.2%+12.6%2.778%
2/14/2025MetLife Investment Management LLC73,150$105K0.0%+115.7%0.059%
2/13/2025XTX Topco Ltd63,530$91K0.0%-81.7%0.051%
2/13/2025Barclays PLC182,711$262K0.0%-63.1%0.148%
2/13/2025Renaissance Technologies LLC606,285$867K0.0%+23.0%0.491%
2/13/2025Wells Fargo & Company MN67,483$97K0.0%+40.3%0.055%
2/12/2025ExodusPoint Capital Management LP194,153$278K0.0%N/A0.157%
2/12/2025Geode Capital Management LLC2,442,250$3.49M0.0%+1.2%1.977%
2/12/2025Wellington Management Group LLP576,148$824K0.0%-6.8%0.466%
2/11/2025Sei Investments Co.69,527$99K0.0%N/A0.056%
2/4/2025Los Angeles Capital Management LLC159,760$228K0.0%-15.8%0.129%
2/4/2025Bank of New York Mellon Corp346,189$495K0.0%-7.0%0.280%
1/24/2025China Universal Asset Management Co. Ltd.26,194$37K0.0%N/A0.021%
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1/17/2025SG Americas Securities LLC112,291$161K0.0%+28.7%0.091%
1/15/2025Avanza Fonder AB56,298$81K0.0%N/A0.046%
12/26/2024JPMorgan Chase & Co.2,351,359$4.44M0.0%+18.9%1.903%
12/13/2024Exome Asset Management LLC1,178,570$2.23M1.5%N/A0.954%
11/19/2024Barclays PLC494,516$934K0.0%+32.7%0.400%
11/16/2024Geode Capital Management LLC2,413,215$4.56M0.0%-3.2%1.967%
11/15/2024Barclays PLC494,516$934K0.0%+32.7%0.403%
11/15/2024XTX Topco Ltd347,255$656K0.0%+186.0%0.283%
11/15/2024Wellington Management Group LLP618,305$1.17M0.0%+16.0%0.504%
11/15/2024State Street Corp2,725,394$5.15M0.0%+1.6%2.222%


MRSN Institutional Ownership - Frequently Asked Questions

During the previous two years, 85 institutional investors and hedge funds held shares of Mersana Therapeutics. The most heavily invested institutionals were VR Adviser LLC ($14.67M), Novo Holdings A S ($6.08M), Rock Springs Capital Management LP ($4.91M), Boxer Capital Management LLC ($3.77M), Knott David M Jr ($3.23M), Affinity Asset Advisors LLC ($2.89M), and Verition Fund Management LLC ($2.46M).Learn more on Mersana Therapeutics' institutional investors.

93.92% of Mersana Therapeutics' stock is owned by institutional investors. Learn more on MRSN's institutional investor holdings.

Of the 68 institutional investors that purchased Mersana Therapeutics' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: AQR Capital Management LLC ($5.14M), Novo Holdings A S ($4.25M), Acadian Asset Management LLC ($2.99M), Boxer Capital Management LLC ($2.64M), 683 Capital Management LLC ($1.81M), Verition Fund Management LLC ($1.29M), and Exome Asset Management LLC ($1.18M).

Institutional investors have bought a total of 1,787,130 shares in the last 24 months. This purchase volume represents approximately $22.86M in transactions.

Of the 15 institutional investors that sold Mersana Therapeutics' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Vanguard Group Inc. ($7.38M), Schonfeld Strategic Advisors LLC ($5.40M), Millennium Management LLC ($2.03M), Geode Capital Management LLC ($1.39M), Qube Research & Technologies Ltd ($1.02M), Luminus Management LLC ($989.31K), and Two Sigma Investments LP ($792.58K).

Institutional investors have sold a total of 20,068,463 shares in the last 24 months. This volume of shares sold represents approximately $164.78M in transactions.


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This page (NASDAQ:MRSN) was last updated on 6/21/2026 by MarketBeat.com Staff.
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