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 TradesOwnershipShort InterestTrendsBuy 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. Email Address 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 CompanyDetails2/17/2025 Bleichroeder LP2,500,000$563K0.1%N/A4.154% 2/3/2025 Sigma Planning Corp703,384$158K0.0%+75.1%1.169% 11/4/2024 Sigma Planning Corp401,750$165K0.0%+71.3%2.220% 8/15/2024 Armistice Capital LLC1,713,000$1.30M0.0%N/A9.459% 2/8/2024 Texas Capital Bank Wealth Management Services Inc12,448$32K0.0%N/A0.157% 2/1/2024 Sigma Planning Corp75,477$192K0.0%-48.2%0.951% 11/15/2023 Annandale Capital LLC74,666$209K0.1%+40.0%0.990% 11/6/2023 Sigma Planning Corp145,786$408K0.0%N/A1.934% 8/10/2023 Carlson Capital L P106,666$495K0.0%-93.5%0.114% 7/28/2023 Voss 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. 5/8/2023 Sigma Planning Corp1,444,550$925K0.0%+34.9%1.562% 2/15/2023 Nantahala Capital Management LLC6,052,867$3.51M0.2%-12.1%6.553% 2/13/2023Callan Capital LLC156,986$91K0.0%N/A0.170% 2/13/2023 Voss Capital LLC550,000$319K0.1%-8.3%0.595% 2/7/2023 Formidable Asset Management LLC90,000$52K0.0%N/A0.097% 1/24/2023 Sigma Planning Corp1,070,504$621K0.0%+19.0%1.160% 11/15/2022 Carlson Capital L P2,010,000$1.20M0.1%+5.4%2.178% 11/14/2022 Annandale Capital LLC710,000$422K0.2%+81.6%0.769% 11/10/2022 Sigma Planning Corp899,554$535K0.0%+6.8%0.975% 11/10/2022 Nantahala Capital Management LLC6,888,822$4.10M0.3%-4.8%7.464% 11/9/2022 Toronto Dominion Bank43,851$26K0.0%+80.4%0.048% 11/2/2022 Voss Capital LLC600,000$357K0.1%-14.3%0.650% 10/7/2022 Sanders Morris Harris LLC657,364$395K0.1%-35.8%0.712% 8/15/2022 Nantahala Capital Management LLC7,232,676$5.37M0.3%-1.2%7.837% 8/13/2022 Voss Capital LLC700,010$519K0.2%+27.3%0.759% 8/11/2022 Sigma Planning Corp842,174$625K0.0%+6.4%0.913% 7/11/2022 Sanders Morris Harris LLC1,024,215$812K0.2%-56.3%1.110% 5/12/2022 Annandale Capital LLC200,000$272K0.1%N/A0.217% 5/12/2022Cetera Advisors LLC60,895$83K0.0%+87.7%0.066% 5/9/2022 Toronto Dominion Bank50,186$68K0.0%+76.6%0.054% 5/4/2022 Formidable Asset Management LLC90,000$122K0.0%N/A0.098% 4/22/2022 Gleason Group Inc.18,250$25K0.0%N/A0.020% 4/20/2022 Sigma Planning Corp791,274$1.08M0.0%+39.5%0.858% 4/11/2022 Sanders Morris Harris LLC2,342,694$3.19M0.6%+19.4%2.540% 2/15/2022 683 Capital Management LLC2,019,770$2.73M0.1%-35.1%2.190% 2/14/2022 Bayesian Capital Management LP37,800$51K0.0%N/A0.041% 2/14/2022 Rockefeller Capital Management L.P.21,809$29K0.0%+1,334.8%0.024% 2/10/2022 WealthShield Partners LLC104,920$142K0.0%+40.8%0.114% 2/10/2022 P.A.W. Capital Corp565,000$763K0.7%-24.7%0.613% 2/9/2022 BNP Paribas Arbitrage SA686,058$926K0.0%+101.4%0.744% Tax Drain Deadline: Protect Your Wealth Before September 15th (Ad)On September 15th, the IRS collects another round of quarterly tax payments—targeting self-employed professionals, retirees, and high-net-worth savers. But the wealthy aren’t just writing checks. They’re moving fast to protect capital and purchasing power using legal, IRS-compliant strategies. American Alternative Assets just released the Mar-A-Lago Accord, a free guide revealing how to reduce Q3 tax exposure and reposition wealth before it’s drained.Click here to download the guide and protect your assets before Sept 15th.2/7/2022 Texas Capital Bank Wealth Management Services Inc.25,000$34K0.0%N/A0.027% 2/4/2022 Toronto Dominion Bank28,410$38K0.0%+1,070.1%0.031% 2/2/2022 Sanders Morris Harris LLC1,961,594$2.92M0.5%+42.8%2.127% 2/2/2022 Sigma Planning Corp567,314$766K0.0%+10.7%0.615% 11/24/2021 Patriot Financial Group Insurance Agency LLC54,529$119K0.0%-66.2%0.061% 11/16/2021 Opaleye Management Inc.549,000$1.20M0.2%-44.0%0.617% 11/16/2021 Voss Capital LLC67,600$147K0.1%-83.9%0.076% 11/16/2021 Squarepoint Ops LLC15,483$34K0.0%N/A0.017% 11/16/2021 Two Sigma Investments LP218,633$477K0.0%N/A0.246% 11/15/2021 Man Group plc260,836$569K0.0%+77.0%0.293% 11/15/2021 683 Capital Management LLC3,112,737$6.79M0.3%+42.1%3.499% 11/12/2021 Renaissance Technologies LLC723,005$1.58M0.0%N/A0.813% 11/12/2021 Carlson Capital L P720,408$1.57M0.1%+41.3%0.810% 11/12/2021 Gagnon Securities LLC59,380$129K0.0%-45.8%0.067% 11/12/2021 Jump Financial LLC105,202$229K0.0%+11.3%0.118% 11/12/2021 Prosight Management LP70,563$154K0.1%-46.9%0.079% 11/12/2021 WealthShield Partners LLC74,512$162K0.0%+83.0%0.084% 11/10/2021 Goldman 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% 10/28/2021 Sigma Planning Corp512,519$1.12M0.0%+34.9%0.576% 10/25/2021 P.A.W. Capital Corp750,000$1.64M1.5%+7.1%0.843% 10/13/2021 Sanders Morris Harris LLC1,373,794$3.08M0.6%+45.3%1.544% 10/7/2021 Newman Dignan & Sheerar Inc.12,915$28K0.0%N/A0.015% 8/17/2021 Woodline Partners LP235,005$780K0.0%-89.4%0.264% 8/17/2021 Millennium Management LLC315,293$1.05M0.0%-13.7%0.354% 8/17/2021 Man Group plc147,380$489K0.0%-24.0%0.166% 8/17/2021 683 Capital Management LLC2,191,207$7.27M0.3%+264.6%2.463% 8/16/2021 Opaleye Management Inc.980,000$3.25M0.5%+12.4%1.102% 8/16/2021 Nantahala Capital Management LLC7,541,497$25.04M0.7%-2.6%8.478% 8/16/2021 Carlson Capital L P510,000$1.69M0.1%+27.5%0.573% 8/13/2021 First Light Asset Management LLC4,115,411$13.66M0.8%+32.6%4.627% 8/13/2021 Voss Capital LLC420,161$1.40M0.6%-4.5%0.472% 8/13/2021 Sigma Planning Corp380,044$1.26M0.0%+16.4%0.427% 8/13/2021 Jump Financial LLC94,500$314K0.0%N/A0.106% 8/12/2021 DRW Securities LLC8,476,176$28.14M0.9%+6.3%9.529% 8/10/2021 Rock Creek Group LP220,161$731K0.1%+15.9%0.248% 8/6/2021 WealthShield Partners LLC40,726$135K0.0%N/A0.046% 8/5/2021 P.A.W. Capital Corp700,000$2.32M2.0%+1.4%0.787% 5/18/2021 Morgan Stanley507,051$3.03M0.0%+6.9%0.570% (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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