This company has been marked as potentially delisted and may not be actively trading. Aptose Biosciences (APTO) Institutional Ownership Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsFDA EventsHeadlinesInsider TradesOwnershipTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Aptose Biosciences (NASDAQ:APTO)CurrentInstitutional OwnershipPercentage26.62%Number ofInstitutional Buyers(last 12 months)2TotalInstitutional Inflows(last 12 months)$21.00MNumber ofInstitutional Sellers(last 12 months)0 Get APTO Insider Trade Alerts Want to know when executives and insiders are buying or selling Aptose Biosciences stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. 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Skip Chart & View Institutional Buying and Selling Data APTO Institutional Buying and Selling by Quarter Aptose Biosciences Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails2/17/2025Bleichroeder LP2,500,000$563K0.1%N/A4.154% 2/3/2025Sigma Planning Corp703,384$158K0.0%+75.1%1.169% 11/4/2024Sigma Planning Corp401,750$165K0.0%+71.3%2.220% 8/15/2024Armistice Capital LLC1,713,000$1.30M0.0%N/A9.459% 2/8/2024Texas Capital Bank Wealth Management Services Inc12,448$32K0.0%N/A0.157% 2/1/2024Sigma Planning Corp75,477$192K0.0%-48.2%0.951% 11/15/2023Annandale Capital LLC74,666$209K0.1%+40.0%0.990% 11/6/2023Sigma Planning Corp145,786$408K0.0%N/A1.934% 8/10/2023Carlson Capital L P106,666$495K0.0%-93.5%0.114% 7/28/2023Voss Capital LLC14,634$68K0.0%-97.3%0.016% Get the Latest News and Ratings for APTO and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Aptose Biosciences and its competitors with MarketBeat's FREE daily newsletter. 5/8/2023Sigma Planning Corp1,444,550$925K0.0%+34.9%1.562% 2/15/2023Nantahala Capital Management LLC6,052,867$3.51M0.2%-12.1%6.553% 2/13/2023Callan Capital LLC156,986$91K0.0%N/A0.170% 2/13/2023Voss Capital LLC550,000$319K0.1%-8.3%0.595% 2/7/2023Formidable Asset Management LLC90,000$52K0.0%N/A0.097% 1/24/2023Sigma Planning Corp1,070,504$621K0.0%+19.0%1.160% 11/15/2022Carlson Capital L P2,010,000$1.20M0.1%+5.4%2.178% 11/14/2022Annandale Capital LLC710,000$422K0.2%+81.6%0.769% 11/10/2022Sigma Planning Corp899,554$535K0.0%+6.8%0.975% 11/10/2022Nantahala Capital Management LLC6,888,822$4.10M0.3%-4.8%7.464% 11/9/2022Toronto Dominion Bank43,851$26K0.0%+80.4%0.048% 11/2/2022Voss Capital LLC600,000$357K0.1%-14.3%0.650% 10/7/2022Sanders Morris Harris LLC657,364$395K0.1%-35.8%0.712% 8/15/2022Nantahala Capital Management LLC7,232,676$5.37M0.3%-1.2%7.837% 8/13/2022Voss Capital LLC700,010$519K0.2%+27.3%0.759% 8/11/2022Sigma Planning Corp842,174$625K0.0%+6.4%0.913% 7/11/2022Sanders Morris Harris LLC1,024,215$812K0.2%-56.3%1.110% 5/12/2022Annandale Capital LLC200,000$272K0.1%N/A0.217% 5/12/2022Cetera Advisors LLC60,895$83K0.0%+87.7%0.066% 5/9/2022Toronto Dominion Bank50,186$68K0.0%+76.6%0.054% 5/4/2022Formidable Asset Management LLC90,000$122K0.0%N/A0.098% 4/22/2022Gleason Group Inc.18,250$25K0.0%N/A0.020% 4/20/2022Sigma Planning Corp791,274$1.08M0.0%+39.5%0.858% 4/11/2022Sanders Morris Harris LLC2,342,694$3.19M0.6%+19.4%2.540% 2/15/2022683 Capital Management LLC2,019,770$2.73M0.1%-35.1%2.190% 2/14/2022Bayesian Capital Management LP37,800$51K0.0%N/A0.041% 2/14/2022Rockefeller Capital Management L.P.21,809$29K0.0%+1,334.8%0.024% 2/10/2022WealthShield Partners LLC104,920$142K0.0%+40.8%0.114% 2/10/2022P.A.W. Capital Corp565,000$763K0.7%-24.7%0.613% 2/9/2022BNP Paribas Arbitrage SA686,058$926K0.0%+101.4%0.744% 2/7/2022Texas Capital Bank Wealth Management Services Inc.25,000$34K0.0%N/A0.027% 2/4/2022Toronto Dominion Bank28,410$38K0.0%+1,070.1%0.031% 2/2/2022Sanders Morris Harris LLC1,961,594$2.92M0.5%+42.8%2.127% 2/2/2022Sigma Planning Corp567,314$766K0.0%+10.7%0.615% 11/24/2021Patriot Financial Group Insurance Agency LLC54,529$119K0.0%-66.2%0.061% 11/16/2021Opaleye Management Inc.549,000$1.20M0.2%-44.0%0.617% 11/16/2021Voss Capital LLC67,600$147K0.1%-83.9%0.076% 11/16/2021Squarepoint Ops LLC15,483$34K0.0%N/A0.017% 11/16/2021Two Sigma Investments LP218,633$477K0.0%N/A0.246% 11/15/2021Man Group plc260,836$569K0.0%+77.0%0.293% 11/15/2021683 Capital Management LLC3,112,737$6.79M0.3%+42.1%3.499% 11/12/2021Renaissance Technologies LLC723,005$1.58M0.0%N/A0.813% 11/12/2021Carlson Capital L P720,408$1.57M0.1%+41.3%0.810% 11/12/2021Gagnon Securities LLC59,380$129K0.0%-45.8%0.067% 11/12/2021Jump Financial LLC105,202$229K0.0%+11.3%0.118% 11/12/2021Prosight Management LP70,563$154K0.1%-46.9%0.079% 11/12/2021WealthShield Partners LLC74,512$162K0.0%+83.0%0.084% 11/10/2021Goldman Sachs Group Inc.751,802$1.64M0.0%+12.5%0.845% 11/2/2021Raymond James & Associates20,150$44K0.0%-27.1%0.023% 11/2/2021Benjamin F. Edwards & Company Inc.20,000$44K0.0%+150.0%0.022% 10/28/2021Sigma Planning Corp512,519$1.12M0.0%+34.9%0.576% 10/25/2021P.A.W. Capital Corp750,000$1.64M1.5%+7.1%0.843% 10/13/2021Sanders Morris Harris LLC1,373,794$3.08M0.6%+45.3%1.544% 10/7/2021Newman Dignan & Sheerar Inc.12,915$28K0.0%N/A0.015% 8/17/2021Woodline Partners LP235,005$780K0.0%-89.4%0.264% 8/17/2021Millennium Management LLC315,293$1.05M0.0%-13.7%0.354% 8/17/2021Man Group plc147,380$489K0.0%-24.0%0.166% 8/17/2021683 Capital Management LLC2,191,207$7.27M0.3%+264.6%2.463% 8/16/2021Opaleye Management Inc.980,000$3.25M0.5%+12.4%1.102% 8/16/2021Nantahala Capital Management LLC7,541,497$25.04M0.7%-2.6%8.478% 8/16/2021Carlson Capital L P510,000$1.69M0.1%+27.5%0.573% 8/13/2021First Light Asset Management LLC4,115,411$13.66M0.8%+32.6%4.627% 8/13/2021Voss Capital LLC420,161$1.40M0.6%-4.5%0.472% 8/13/2021Sigma Planning Corp380,044$1.26M0.0%+16.4%0.427% 8/13/2021Jump Financial LLC94,500$314K0.0%N/A0.106% 8/12/2021DRW Securities LLC8,476,176$28.14M0.9%+6.3%9.529% (Data available from 1/1/2016 forward) APTO Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of APTO shares? During the previous two years, the following institutional investors and hedge funds held shares of Aptose Biosciences shares: Armistice Capital LLC ($1.30M), Bleichroeder LP ($563K), Annandale Capital LLC ($209K), and Sigma Planning Corp ($158K), Texas Capital Bank Wealth Management Services Inc ($32K).Learn more on Aptose Biosciences' institutional investors. What percentage of Aptose Biosciences' stock is owned by institutional investors? 26.62% of Aptose Biosciences' stock is owned by institutional investors. Learn more on APTO's institutional investor holdings. Which institutional investors have been buying Aptose Biosciences' stock? The following institutional investors have purchased Aptose Biosciences' stock in the last 24 months: Bleichroeder LP ($2.50M), Armistice Capital LLC ($1.71M), Sigma Planning Corp ($614.70K), Annandale Capital LLC ($21.33K), and Texas Capital Bank Wealth Management Services Inc ($12.45K). How much institutional buying is happening at Aptose Biosciences? Institutional investors have bought a total of 2,968,916 shares in the last 24 months. This purchase volume represents approximately $21.00M in transactions. 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