Castellum (CTM) Institutional Ownership $1.15 +0.02 (+1.77%) Closing price 09/9/2025 04:10 PM EasternExtended Trading$1.14 -0.01 (-1.30%) As of 07:00 AM Eastern Extended trading is trading that happens on electronic markets outside of regular trading hours. This is a fair market value extended hours price provided by Polygon.io. Learn more. Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartHeadlinesInsider TradesOwnershipSEC FilingsShort InterestBuy This Stock Institutional Ownership Changes (13F Filings) for Castellum (NYSEAMERICAN:CTM)CurrentInstitutional OwnershipPercentage3.39%Number ofInstitutional Buyers(last 12 months)9TotalInstitutional Inflows(last 12 months)$4.71MNumber ofInstitutional Sellers(last 12 months)2TotalInstitutional Outflows(last 12 months)$696.09K Get CTM Insider Trade Alerts Want to know when executives and insiders are buying or selling Castellum stock? 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Skip Chart & View Institutional Buying and Selling Data CTM Institutional Buying and Selling by Quarter Castellum Major Shareholders & Ownership History Export to ExcelReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails8/14/2025Jane Street Group LLC194,733$204K0.0%N/A0.209% 8/12/2025XTX Topco Ltd135,796$143K0.0%+107.6%0.158% 8/8/2025Meridian Wealth Management LLC616,800$648K0.0%+6.2%0.717% 8/8/2025Geode Capital Management LLC599,198$629K0.0%+43.2%0.696% 8/4/2025Savvy Advisors Inc.191,100$201K0.0%N/A0.222% 5/15/2025Cubist Systematic Strategies LLC67,680$72K0.0%N/A0.097% 5/8/2025XTX Topco Ltd65,419$69K0.0%N/A0.094% 4/29/2025Bank of New York Mellon Corp600,002$636K0.0%-51.1%0.858% 4/17/2025Inscription Capital LLC250,000$265K0.0%N/A0.357% 2/14/2025Jane Street Group LLC449,001$898K0.0%+2,180.2%0.642% 2/12/2025Geode Capital Management LLC299,643$599K0.0%+49.9%0.428% 2/12/2025PKS Advisory Services LLC42,221$84K0.0%N/A0.060% 2/6/2025Meridian Wealth Management LLC589,400$1.18M0.1%-2.5%0.843% 2/4/2025Bank of New York Mellon Corp1,227,824$2.46M0.0%N/A1.756% 8/15/2024Armistice Capital LLC3,547,987$660K0.0%-23.8%6.691% 5/20/2024Virtu Financial LLC103,288$27K0.0%+82.2%0.195% 2/8/2024Meridian Wealth Management LLC503,500$150K0.0%+123.8%1.056% 1/18/2024Inscription Capital LLC250,000$74K0.0%N/A0.524% 10/17/2023Meridian Wealth Management LLC225,000$52K0.0%+44.2%0.473% 8/2/2023Meridian Wealth Management LLC156,000$78K0.0%-16.7%0.369% 7/19/2023Magnus Financial Group LLC250,000$125K0.0%N/A0.592% 2/9/2023Almanack Investment Partners LLC.50,000$63K0.0%N/A2.404% 2/1/2023Kestra Private Wealth Services LLC74,804$94K0.0%N/A3.596% 1/31/2023Kestra Advisory Services LLC73,519$93K0.0%N/A3.535% (Data available from 1/1/2016 forward) CTM Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of CTM shares? During the previous two years, 11 institutional investors and hedge funds held shares of Castellum. The most heavily invested institutionals were Armistice Capital LLC ($660K), Meridian Wealth Management LLC ($648K), Bank of New York Mellon Corp ($636K), Geode Capital Management LLC ($629K), Inscription Capital LLC ($265K), Jane Street Group LLC ($204K), and Savvy Advisors Inc. ($201K).Learn more on Castellum's institutional investors. What percentage of Castellum's stock is owned by institutional investors? 3.39% of Castellum's stock is owned by institutional investors. Learn more on CTM's institutional investor holdings. Which institutional investors have been buying Castellum's stock? Of the 10 institutional investors that purchased Castellum's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Bank of New York Mellon Corp ($1.23M), Jane Street Group LLC ($624.04K), Inscription Capital LLC ($500K), Meridian Wealth Management LLC ($383.50K), Geode Capital Management LLC ($280.39K), Savvy Advisors Inc. ($191.10K), and XTX Topco Ltd ($135.80K). How much institutional buying is happening at Castellum? Institutional investors have bought a total of 2,855,051 shares in the last 24 months. This purchase volume represents approximately $4.71M in transactions. Which of Castellum's major shareholders have been selling company stock? The following institutional investors have sold Castellum stock in the last 24 months: Bank of New York Mellon Corp ($627.82K), and Meridian Wealth Management LLC ($15.30K). How much institutional selling is happening at Castellum? Institutional investors have sold a total of 643,122 shares in the last 24 months. This volume of shares sold represents approximately $696.09K in transactions. Related Companies Absci Institutional Ownership Ooma Institutional Ownership TSS Institutional Ownership National Research Institutional Ownership OptimizeRx Institutional Ownership QMMM Institutional Ownership ReposiTrak Institutional Ownership Paysign Institutional Ownership 8X8 Institutional Ownership Akso Health Group Institutional Ownership This page (NYSEAMERICAN:CTM) was last updated on 9/10/2025 by MarketBeat.com Staff From Our Partners“HELIOS”: My No. 1 Investment of the 2020sA mysterious new energy technology — backed by Nvidia, Google, and even legendary investors like Stanley Druck...Stansberry Research | SponsoredWall Street legend: “Put $1,000 in this AI stock”A massive money shift is underway in the AI market. 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