Notice: This company has been marked as potentially delisted and may not be actively trading. Merrimack Pharmaceuticals (MACK) Institutional Ownership Add Compare Share Share Ownership Stock AnalysisDividendEarningsHeadlinesInsider TradesOwnershipTrends Institutional Ownership Changes (13F Filings) for Merrimack Pharmaceuticals (NASDAQ:MACK)CurrentInstitutional OwnershipPercentage63.97%Number ofInstitutional Buyers(last 12 months)8TotalInstitutional Inflows(last 12 months)$9.10MNumber ofInstitutional Sellers(last 12 months)2TotalInstitutional Outflows(last 12 months)$1.36M Get MACK Insider Trade Alerts Want to know when executives and insiders are buying or selling Merrimack Pharmaceuticals stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. Email Address Skip Chart & View Institutional Buying and Selling Data MACK Institutional Buying and Selling by Quarter Ad Colonial Metals“This Changes Everything” - Trump Hands Millions Massive IRS GiftNow it's your time to return the favor by taking advantage of this tax "revenge loophole." Because even as we wait for Trump's agenda to kick in…>> YES! Send Me My FREE Gold Guide! Merrimack Pharmaceuticals Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails8/14/2024 Marshall Wace LLP38,221$578K0.0%N/A0.258% 8/9/2024 Dimensional Fund Advisors LP318,995$4.83M0.0%-19.9%2.157% 8/8/2024 JBF Capital Inc.39,637$600K0.1%N/A0.268% 8/1/2024 Rhumbline Advisers2,480$38K0.0%-81.7%0.017% 5/15/2024 Aristides Capital LLC10,000$148K0.1%N/A0.069% 5/10/2024 Vanguard Group Inc.620,847$9.17M0.0%+2.0%4.272% Get the Latest News and Ratings for MACK and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Merrimack Pharmaceuticals and its competitors with MarketBeat's FREE daily newsletter. 5/1/2024 BNP Paribas Financial Markets5,077$75K0.0%+67.3%0.035% 2/14/2024 ADAR1 Capital Management LLC549,418$7.37M2.6%N/A3.837% 1/30/2024 Strs Ohio3,300$44K0.0%N/A0.023% 1/25/2024 Allspring Global Investments Holdings LLC11,827$159K0.0%N/A0.083% 11/15/2023 Kennedy Capital Management LLC93,708$1.16M0.0%+2.4%0.654% 11/14/2023 Wittenberg Investment Management Inc.209,739$2.59M0.9%+2.3%1.465% 11/8/2023 Sepio Capital LP306,680$3.78M0.3%+4.1%2.142% 8/11/2023 Wittenberg Investment Management Inc.204,994$2.52M0.9%+3.5%1.432% 8/4/2023 American International Group Inc.5,039$62K0.0%N/A0.035% 8/3/2023 Fifth Lane Capital LP10,929$134K0.0%N/A0.077% 5/15/2023 Wittenberg Investment Management Inc.197,994$2.43M0.9%+3.6%1.388% 5/15/2023 Madison Avenue Partners LP553,085$6.80M1.5%N/A3.879% 5/15/2023 Sio Capital Management LLC272,843$3.35M1.7%+9.1%1.913% 5/12/2023 Yakira Capital Management Inc.72,118$886K0.2%-15.9%0.506% 2/15/2023 Nantahala Capital Management LLC210,000$2.41M0.2%-51.1%1.566% 2/10/2023 22NW LP1,015,048$11.63M6.3%-17.5%7.569% 2/10/2023 Yakira Capital Management Inc.85,732$982K0.2%-26.0%0.639% 2/6/2023 Wittenberg Investment Management Inc.191,194$2.19M0.9%+1.3%1.426% 11/14/2022 Point72 Asset Management L.P.1,100,994$4.13M0.0%+228.5%8.210% 11/10/2022 Nantahala Capital Management LLC429,596$1.61M0.1%-12.6%3.204% 10/28/2022 Sepio Capital LP294,545$1.11M0.1%-6.9%2.196% 8/16/2022 Western Standard LLC1,269,558$7.55M5.7%+8.3%9.467% 8/15/2022 Nantahala Capital Management LLC491,509$2.92M0.1%-4.9%3.665% 8/11/2022 Yakira Capital Management Inc.115,821$689K0.1%+30.6%0.864% 7/26/2022 Sepio Capital LP316,313$1.88M0.2%+6.7%2.359% 5/13/2022 Bronte Capital Management Pty Ltd.578,313$3.66M0.3%+7.6%4.313% 5/12/2022 Yakira Capital Management Inc.88,683$561K0.1%+20.7%0.661% 5/9/2022 Sepio Capital LP296,546$1.88M0.2%+276.2%2.211% 2/16/2022 Western Standard LLC1,172,463$4.58M2.7%-7.6%8.743% 2/10/2022 Bronte Capital Management Pty Ltd.537,584$2.10M0.1%-2.1%4.009% 2/9/2022 Dimensional Fund Advisors LP488,687$1.91M0.0%-2.1%3.644% 2/9/2022 Yakira Capital Management Inc.73,450$287K0.0%+21.1%0.548% 1/20/2022 Radnor Capital Management LLC13,332$52K0.0%N/A0.099% 11/15/2021 Point72 Asset Management L.P.341,685$1.65M0.0%+63.0%2.548% Breaking News: Tesla headed to $500… (Ad)That headline hit late last night…and the rally has begun Which is why we want to urge you to go ahead and download Lance’s e-Book now outlining his bullish case for Tesla. So to claim your free digital copy today, simply follow this link and enter your email address. 11/15/2021 Dimensional Fund Advisors LP499,368$2.41M0.0%-3.5%3.724% 11/9/2021BlackRock Inc.211,051$1.02M0.0%+12.8%1.574% 11/3/2021 Sepio Capital LP78,829$381K0.0%-64.4%0.588% 8/25/2021 Marshall Wace LLP39,150$250K0.0%-57.3%0.292% 8/17/2021 Bridgeway Capital Management LLC59,200$378K0.0%-7.8%0.441% 8/16/2021 Point72 Asset Management L.P.209,563$1.34M0.0%N/A1.563% 8/16/2021 Nantahala Capital Management LLC571,946$3.66M0.1%-6.1%4.265% 8/16/2021 State Street Corp46,556$297K0.0%+316.2%0.347% 8/16/2021 Western Standard LLC1,269,558$8.11M4.8%+25.5%9.467% 8/16/2021 Marshall Wace LLP39,150$250K0.0%-57.3%0.292% 8/13/2021 Renaissance Technologies LLC101,970$652K0.0%-45.8%0.760% 8/13/2021 Northern Trust Corp31,678$203K0.0%-12.5%0.236% 8/13/2021 Geode Capital Management LLC96,692$617K0.0%+6.0%0.721% 8/12/2021 Wittenberg Investment Management Inc.189,294$1.21M0.5%+1.7%1.412% 5/18/2021 Millennium Management LLC12,292$77K0.0%N/A0.092% 5/17/2021 Price T Rowe Associates Inc. MD10,500$66K0.0%N/A0.078% 5/14/2021 Nantahala Capital Management LLC608,974$3.82M0.1%-19.0%4.541% 5/14/2021 Dimensional Fund Advisors LP519,220$3.26M0.0%-5.7%3.872% 5/13/2021 Renaissance Technologies LLC188,161$1.18M0.0%+6.4%1.403% 5/13/2021 Bank of New York Mellon Corp42,225$265K0.0%+140.7%0.315% 5/12/2021 Geode Capital Management LLC91,208$572K0.0%+9.3%0.680% 5/10/2021 Sepio Capital LP218,907$1.38M0.1%+13.1%1.632% 5/7/2021BlackRock Inc.255,503$1.61M0.0%+1.4%1.905% 4/26/2021 Mascoma Wealth Management LLC5,000$31K0.0%N/A0.037% 4/13/2021 Bronte Capital Management Pty Ltd.550,679$3.46M0.4%+3.6%4.106% 3/8/2021 Dimensional Fund Advisors LP550,539$3.79M0.0%-2.9%4.115% 2/25/2021 Dimensional Fund Advisors LP550,539$3.79M0.0%-2.9%4.115% 2/10/2021 Renaissance Technologies LLC176,861$1.22M0.0%N/A1.322% 12/16/2020 Bronte Capital Management Pty Ltd.531,510$2.05M0.4%N/A3.972% 11/17/2020 Nantahala Capital Management LLC751,943$3.01M0.1%+0.6%5.620% 11/12/2020 Bronte Capital Management Pty Ltd.531,510$2.05M0.4%N/A3.972% (Data available from 1/1/2016 forward) MACK Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of MACK shares? During the previous two years, 20 institutional investors and hedge funds held shares of Merrimack Pharmaceuticals. The most heavily invested institutionals were 22NW LP ($11.63M), Vanguard Group Inc. ($9.17M), ADAR1 Capital Management LLC ($7.37M), Madison Avenue Partners LP ($6.80M), Dimensional Fund Advisors LP ($4.83M), Sepio Capital LP ($3.78M), and Sio Capital Management LLC ($3.35M).Learn more on MACK's institutional investors. What percentage of Merrimack Pharmaceuticals stock is owned by institutional investors? 63.97% of Merrimack Pharmaceuticals stock is owned by institutional investors. Learn more on MACK's institutional investor holdings. Which institutional investors have been buying Merrimack Pharmaceuticals stock? Of the 15 institutional investors that purchased Merrimack Pharmaceuticals stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Madison Avenue Partners LP ($553.09K), ADAR1 Capital Management LLC ($549.42K), JBF Capital Inc. ($39.64K), Marshall Wace LLP ($38.22K), Sio Capital Management LLC ($22.84K), Wittenberg Investment Management Inc. ($21.05K), and Sepio Capital LP ($12.14K). How much institutional buying is happening at Merrimack Pharmaceuticals? Institutional investors have bought a total of 1,293,617 shares in the last 24 months. This purchase volume represents approximately $16.81M in transactions. Which Merrimack Pharmaceuticals major shareholders have been selling company stock? The following institutional investors have sold Merrimack Pharmaceuticals stock in the last 24 months: Nantahala Capital Management LLC ($219.60K), 22NW LP ($215.97K), Dimensional Fund Advisors LP ($79.01K), Yakira Capital Management Inc. ($43.70K), and Rhumbline Advisers ($11.04K). How much institutional selling is happening at Merrimack Pharmaceuticals? Institutional investors have sold a total of 569,310 shares in the last 24 months. This volume of shares sold represents approximately $6.87M in transactions. Related Companies IRWD Major Shareholders EBS Major Shareholders RIGL Major Shareholders SGMO Major Shareholders CDXS Major Shareholders XOMA Major Shareholders VNDA Major Shareholders LXRX Major Shareholders VSTM Major Shareholders ACHV Major Shareholders This page (NASDAQ:MACK) was last updated on 11/21/2024 by MarketBeat.com Staff From Our PartnersThe Crypto That’s Making Wall Street SweatThe Crypto Wall Street Is Desperate to Hide It's happening now, right under everyone's radar. Big tech gian...Crypto 101 Media | SponsoredMissed Nvidia? 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