Free Trial
→ $30 stock to buy before Starlink goes public (WATCH NOW!) (From Paradigm Press) (Ad)tc pixel Free MRSN Stock Alerts

This company has been marked as potentially delisted and may not be actively trading.

Mersana Therapeutics (MRSN) Institutional Ownership

Mersana Therapeutics logo
Compare

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

Current
Institutional Ownership
Percentage
93.92%
Number of
Institutional Buyers
(last 12 months)
29
Total
Institutional Inflows
(last 12 months)
$118.19M
Number of
Institutional Sellers
(last 12 months)
16
Total
Institutional Outflows
(last 12 months)
$166.91M
Get MRSN Insider Trade Alerts

Want to know when executives and insiders are buying or selling Mersana Therapeutics stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily.

Subscribe Now
SMS is currently available in Australia, Belgium, Canada, France, Germany, Ireland, Italy, New Zealand, the Netherlands, Singapore, South Africa, Spain, Switzerland, the United Kingdom, and the United States. By entering your phone number and clicking the sign-up button, you agree to receive periodic text messages from MarketBeat at the phone number you submitted, including texts that may be sent using an automatic telephone dialing system. Message and data rates may apply. Message frequency will vary. Messages will consist of stock alerts, news stories, and partner advertisements/offers. Consent is not a condition of the purchase of any goods or services. Text HELP for help/customer support. Unsubscribe at any time by replying "STOP" to any text message that you receive from MarketBeat or by visiting our mailing preferences page. Read our full terms of service and privacy policy.
Skip Chart & View Institutional Buying and Selling Data

MRSN Institutional Buying and Selling by Quarter

Mersana Therapeutics Major Shareholders & Ownership History

Export
Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
2/18/2026Mackenzie Financial Corp33,834$967K0.0%-29.2%0.677%
2/18/2026XTX Topco Ltd11,948$346K0.0%N/A0.239%
2/18/2026Millennium Management LLC63,305$1.83M0.0%-18.8%1.266%
2/17/2026AQR Capital Management LLC37,264$1.08M0.0%-20.2%0.745%
2/16/2026OMERS ADMINISTRATION Corp7,900$229K0.0%N/A0.158%
2/16/2026Yakira Capital Management Inc.32,663$945K0.3%N/A0.653%
2/16/2026Alamea Verwaltungs GmbH24,165$699K0.5%-94.4%0.483%
2/13/2026Affinity Asset Advisors LLC100,000$2.89M0.2%N/A2.000%
2/13/2026State Street Corp19,543$565K0.0%-34.5%0.391%
2/13/2026Ieq Capital LLC12,955$375K0.0%-15.0%0.259%
2/12/2026Groupe la Francaise61,488$1.78M0.0%N/A1.230%
2/12/2026Knott 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%
2/9/2026Geode Capital Management LLC43,920$1.27M0.0%+5.5%0.879%
2/5/2026Gamco Investors INC. ET AL10,000$289K0.0%N/A0.200%
2/5/2026Gabelli 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%
1/26/2026CWM LLC2,286$66K0.0%-60.3%0.046%
1/1/2026JPMorgan Chase & Co.6,108$47K0.0%-95.3%0.122%
11/17/2025Voleon Capital Management LP13,200$102K0.0%N/A0.265%
11/17/2025Millennium Management LLC77,989$605K0.0%-96.3%1.563%
11/17/2025Bank of America Corp DE66,397$515K0.0%+230.6%1.331%
11/14/2025Schonfeld Strategic Advisors LLC273,579$2.12M0.0%-95.2%5.483%
11/14/2025Two Sigma Investments LP30,688$238K0.0%-96.3%0.615%
11/13/2025Mackenzie Financial Corp47,819$371K0.0%N/A0.958%
11/7/2025Vanguard Group Inc.302,553$2.35M0.0%-96.1%6.063%
11/7/2025JPMorgan Chase & Co.6,108$47K0.0%-95.3%0.122%
10/15/2025CWM LLC5,756$44K0.0%-96.5%0.115%
10/3/2025Luminus Management LLC50,000$388K0.3%-95.2%1.002%
8/15/2025683 Capital Management LLC1,990,000$589K0.0%+20.6%39.880%
8/14/2025Jane Street Group LLC511,182$151K0.0%N/A10.244%
8/14/2025Qube Research & Technologies Ltd152,877$45K0.0%-87.0%3.064%
8/14/2025Cerity Partners LLC320,805$95K0.0%+31.4%6.429%
8/13/2025Marshall Wace LLP226,971$68K0.0%N/A4.553%
8/12/2025JPMorgan Chase & Co.130,094$39K0.0%+156.6%2.607%
8/8/2025Geode Capital Management LLC1,049,205$311K0.0%-57.0%21.026%
6/27/2025Goldman 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%
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%
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

Who are the largest shareholders of MRSN shares?

During the previous two years, 88 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.

What percentage of Mersana Therapeutics' stock is owned by institutional investors?

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

Which institutional investors have been buying Mersana Therapeutics' stock?

Of the 72 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 ($3.28M), 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).

How much institutional buying is happening at Mersana Therapeutics?

Institutional investors have bought a total of 12,865,540 shares in the last 24 months. This purchase volume represents approximately $118.19M in transactions.

Which of Mersana Therapeutics' major shareholders have been selling company stock?

Of the 16 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).

How much institutional selling is happening at Mersana Therapeutics?

Institutional investors have sold a total of 20,316,163 shares in the last 24 months. This volume of shares sold represents approximately $166.91M in transactions.


Related Companies

This page (NASDAQ:MRSN) was last updated on 5/7/2026 by MarketBeat.com Staff.
From Our Partners
Iran's New Leader Just Said Something That Should Terrify Every American
Iran's Supreme Leader has declared the Strait of Hormuz closed as leverage against the U.S. - and with 40% of ...
American Alternative | Sponsoredtc pixel
Your book attached
Your Download Link (Expiring) If you still haven't downloaded the free Simple Options Trading For Beginners...
Profits Run | Sponsoredtc pixel
My feud with Zohran Mamdani
Emmy-winning analyst releases his next big story Whitney Tilson shocked the nation on 60 Minutes when he ac...
Stansberry Research | Sponsoredtc pixel
Sell 99% of Your Stocks, Do THIS Instead…
Millionaire Trader Exposes: "The Single Stock Income Plan" With over 6,000 stocks on the market to choose ...
The Oxford Club | Sponsoredtc pixel
Trade this between 9:30 and 10:45 am EST
The first 75 minutes of the trading day may be the most overlooked window for consistent opportunities.If you ...
Base Camp Trading | Sponsoredtc pixel
Iran War Shock: What I Was Told In That Private Meeting
You’re Being LIED To About The Iran War Forget EVERYTHING you’ve heard about the Iran war. Especially th...
Banyan Hill Publishing | Sponsoredtc pixel
Before you buy SpaceX shares, consider this alternative approach
SpaceX has confidentially filed for an IPO with the SEC, targeting a June 2026 listing at a valuation exceedin...
Weiss Ratings | Sponsoredtc pixel
Elon Unveils AI Passive Income Stream for Millions of Americans
During Tesla's last earnings call, Elon Musk outlined a new AI-driven approach he says could generate $30,000-...
InvestorPlace | Sponsoredtc pixel