Octave Specialty Group (OSG) Institutional Ownership $5.60 -0.15 (-2.53%) Closing price 05/22/2026 03:59 PM EasternExtended Trading$5.62 +0.02 (+0.43%) As of 05/22/2026 06:26 PM 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 Massive. Learn more. Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Octave Specialty Group (NYSE:OSG)CurrentInstitutional OwnershipPercentage80.92%Number ofInstitutional Buyers(last 12 months)100TotalInstitutional Inflows(last 12 months)$229.39MNumber ofInstitutional Sellers(last 12 months)29TotalInstitutional Outflows(last 12 months)$30.11M Get OSG Insider Trade Alerts Want to know when executives and insiders are buying or selling Octave Specialty Group stock? Sign up for InsiderTrades.com's daily newsletter to get the latest insider transactions delivered to your inbox daily. Subscribe Now View SMS TermsSMS 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. 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Skip Chart & View Institutional Buying and Selling Data OSG Institutional Buying and Selling by Quarter Octave Specialty Group Major Shareholders & Ownership History ExportReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails5/19/2026 Bank of America Corp DE256,110$1.19M0.0%-22.6%0.569% 5/18/2026 Empowered Funds LLC114,004$530K0.0%-28.9%0.253% 5/16/2026 Quantinno Capital Management LP48,700$226K0.0%-38.1%0.108% 5/16/2026 Lazard Asset Management LLC29,220$136K0.0%N/A0.065% 5/15/2026 RIHO Partners LLC546,569$2.54M1.6%N/A1.214% 5/14/2026 Renaissance Technologies LLC227,726$1.06M0.0%+805.2%0.506% 5/14/2026 Public Employees Retirement System of Ohio68,805$320K0.0%N/A0.153% 5/14/2026 Sei Investments Co.156,078$726K0.0%+133.9%0.347% 5/14/2026 Walleye Capital LLC67,134$312K0.0%-47.7%0.149% 5/14/2026 State of Wyoming28,784$134K0.0%+49.5%0.064% One page of the SpaceX S-1 will move this stock overnight (Ad)When SpaceX files its S-1 in June, the SEC will require full disclosure of operating expenses - including power consumption for 1 million GPUs, a cost that rivals entire cities. That disclosure will name the supplier. One small, publicly traded power infrastructure company sits at the center of this - carrying a $1.5 billion backlog and priced like a utility. Dylan Jovine has the full breakdown.See the stock the S-1 revealed >>5/7/2026 Commonwealth Financial Services LLC29,008$135K0.0%N/A0.064% 5/7/2026 Dimensional Fund Advisors LP1,310,132$6.09M0.0%-22.3%2.911% 5/7/2026 Parallel Advisors LLC6,473$30K0.0%+4,186.8%0.014% 5/6/2026 Aire Advisors LLC13,446$63K0.0%N/A0.030% 5/5/2026 Bank of New York Mellon Corp130,471$607K0.0%-5.6%0.290% 4/30/2026 Hsbc Holdings PLC102,430$476K0.0%+11.3%0.228% 4/25/2026 Able Wealth Management LLC15,246$71K0.0%N/A0.034% 4/17/2026 Anchyra Partners LLC16,328$76K0.0%N/A0.036% 4/16/2026 SG Americas Securities LLC18,817$87K0.0%N/A0.042% 4/16/2026 Quotient Wealth Partners LLC16,896$79K0.0%N/A0.038% 3/20/2026 Hsbc Holdings PLC92,040$713K0.0%N/A0.205% 3/12/2026 PEAK6 LLC30,478$237K0.0%N/A0.068% 2/23/2026 Virtu Financial LLC19,235$150K0.0%N/A0.044% 2/19/2026 Invesco Ltd.156,504$1.22M0.0%N/A0.357% 2/18/2026 Empowered Funds LLC160,387$1.25M0.0%N/A0.366% 2/18/2026 XTX Topco Ltd31,058$242K0.0%N/A0.071% 2/18/2026 nVerses Capital LLC12,181$95K0.2%N/A0.028% 2/18/2026 Quadrature Capital Ltd21,219$165K0.0%N/A0.048% 2/18/2026 Oxford Asset Management LLP25,413$198K0.1%N/A0.058% 2/18/2026 Millennium Management LLC303,282$2.36M0.0%N/A0.692% 2/18/2026 Engineers Gate Manager LP81,585$635K0.0%N/A0.186% 2/18/2026 Balyasny Asset Management L.P.42,917$334K0.0%N/A0.098% 2/18/2026 Bridgeway Capital Management LLC245,387$1.91M0.0%N/A0.560% 2/17/2026 Schonfeld Strategic Advisors LLC169,824$1.32M0.0%N/A0.388% 2/17/2026 AQR Capital Management LLC70,128$546K0.0%N/A0.160% 2/17/2026 Jump Financial LLC85,213$663K0.0%N/A0.195% 2/17/2026 Price T Rowe Associates Inc. MD70,941$552K0.0%N/A0.162% 2/17/2026 Russell Investments Group Ltd.346,258$2.69M0.0%N/A0.790% 2/17/2026 Kemnay Advisory Services Inc.8,059$63K0.0%N/A0.018% 2/17/2026 ExodusPoint Capital Management LP109,765$854K0.0%N/A0.251% Porter flew 3,300 miles to investigate this system (Ad)Porter Stansberry flew the Porter and Co. team 3,300 miles to Dublin to investigate a 17-year investing experiment called Project Prophet - and documented everything on film. Rooted in the laws of physics, this quantitative approach challenges conventional wealth-building wisdom. With 17 years of verified data behind it, Porter calls it unlike anything he has seen in nearly 30 years in the business.Watch the full investigation and decide for yourself2/16/2026 Wolf Hill Capital Management LP1,888,973$14.70M1.6%N/A4.312% 2/16/2026 Verition Fund Management LLC17,500$136K0.0%N/A0.040% 2/16/2026 PEAK6 LLC30,478$237K0.0%N/A0.070% 2/16/2026 Barclays PLC680,441$5.29M0.0%N/A1.553% 2/13/2026 The Manufacturers Life Insurance Company 12,594$98K0.0%N/A0.029% 2/13/2026 DLD Asset Management LP60,421$470K0.0%N/A0.138% 2/13/2026 Gendell Jeffrey L1,569,472$12.21M0.2%N/A3.582% 2/13/2026 Quarry LP15,103$118K0.0%N/A0.034% 2/13/2026 Jacobs Levy Equity Management Inc.237,185$1.85M0.0%N/A0.541% 2/13/2026 Essex Investment Management Co. LLC410,822$3.20M0.5%N/A0.938% 2/13/2026 Charles Schwab Investment Management Inc.361,424$2.81M0.0%N/A0.825% 2/13/2026 Police & Firemen s Retirement System of New Jersey11,825$92K0.0%N/A0.027% 2/13/2026 State Street Corp943,368$7.34M0.0%N/A2.153% 2/13/2026 Wells Fargo & Company MN85,734$667K0.0%N/A0.196% 2/12/2026 Third Avenue Management LLC782,093$6.09M1.1%N/A1.785% 2/12/2026 MetLife Investment Management LLC19,956$155K0.0%N/A0.046% 2/12/2026 State Board of Administration of Florida Retirement System12,630$98K0.0%N/A0.029% 2/12/2026 Renaissance Technologies LLC25,158$196K0.0%N/A0.057% 2/12/2026 Dimensional Fund Advisors LP1,685,627$13.11M0.0%N/A3.848% 2/12/2026 Federated Hermes Inc.4,420$34K0.0%N/A0.010% 2/12/2026 Cruiser Capital Advisors LLC107,140$834K0.7%N/A0.245% 2/12/2026 New York State Common Retirement Fund10,073$78K0.0%N/A0.023% 2/12/2026 Nuveen LLC810,279$6.30M0.0%N/A1.850% 2/11/2026 Empowered Funds LLC160,387$1.25M0.0%N/A0.366% 2/11/2026 Metis Global Partners LLC25,136$196K0.0%N/A0.057% 2/11/2026 Deutsche Bank AG25,647$200K0.0%N/A0.059% 2/11/2026 Fox Run Management L.L.C.42,354$330K0.1%N/A0.097% 2/11/2026 Cerity Partners LLC11,332$88K0.0%N/A0.026% 2/11/2026 Franklin Resources Inc.11,959$93K0.0%N/A0.027% 2/11/2026 Arrowpoint Investment Partners Singapore Pte. Ltd.203,011$1.58M0.2%N/A0.463% 2/11/2026 State of Wyoming19,249$150K0.0%N/A0.044% 2/10/2026 CIBC Asset Management Inc23,893$186K0.0%N/A0.055% 2/10/2026 Goldman Sachs Group Inc.779,975$6.07M0.0%N/A1.780% 2/10/2026 AXQ Capital LP40,374$314K0.1%N/A0.092% 2/10/2026 Norges Bank75,000$584K0.0%N/A0.171% 2/10/2026 Intech Investment Management LLC21,038$164K0.0%N/A0.048% 2/9/2026 Geode Capital Management LLC1,024,547$7.97M0.0%N/A2.339% 2/6/2026 Legato Capital Management LLC132,620$1.03M0.1%N/A0.303% 2/6/2026 Mraz Amerine & Associates Inc.18,950$147K0.0%N/A0.043% 2/6/2026 Prescott Group Capital Management L.L.C.893,517$6.95M0.6%N/A2.040% 2/4/2026 KLCM Advisors Inc.23,900$186K0.0%N/A0.055% 2/3/2026 Western Standard LLC2,504,627$19.49M9.0%N/A5.717% 2/2/2026 VELA Investment Management LLC178,752$1.39M0.3%N/A0.408% 1/30/2026 Harbor Advisors LLC196,382$1.53M0.2%N/A0.448% 1/29/2026 Inscription Capital LLC10,800$84K0.0%N/A0.025% 1/29/2026 Calamos Advisors LLC49,089$382K0.0%N/A0.112% 1/28/2026 Crown Wealth Group LLC11,162$87K0.0%N/A0.025% 1/26/2026 CWM LLC5,598$44K0.0%N/A0.013% 1/9/2026 SG Americas Securities LLC403,237$3.64M0.0%+434.7%0.920% 1/1/2026 JPMorgan Chase & Co.34,555$288K0.0%+10.6%0.079% You cannot escape this reality (Ad)The last time something like this happened was 1974 - a secret deal that quietly determined the financial fate of an entire generation. According to Porter Stansberry, founder of one of the largest independent financial research firms in the world, it is happening again. Fortune calls it 'the biggest change to the world's relationship with the dollar' in a generation. Stansberry says Trump's money reset - enacted through executive orders and a treaty signed by 13 nations in December 2025 called Pax Silica - could determine whether you are enriched or quietly impoverished by the shift already underway.Read Porter Stansberry's full briefing and find out which moves to make now1/1/2026 Tudor Investment Corp ET AL125,155$1.04M0.0%-59.1%0.286% 12/9/2025 Tudor Investment Corp ET AL125,155$1.04M0.0%-59.1%0.286% 11/17/2025 Verition Fund Management LLC20,533$171K0.0%-47.8%0.047% 11/17/2025 Prelude Capital Management LLC17,878$149K0.0%N/A0.041% 11/17/2025 Millennium Management LLC700,895$5.85M0.0%-29.6%1.600% 11/17/2025 MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.20,052$167K0.0%-23.7%0.046% 11/17/2025 Brevan Howard Capital Management LP35,485$296K0.0%-30.0%0.081% 11/17/2025 Bank of America Corp DE203,202$1.70M0.0%+22.2%0.464% 11/17/2025 Aquatic Capital Management LLC12,588$105K0.0%N/A0.029% 11/14/2025 Schonfeld Strategic Advisors LLC548,442$4.57M0.0%+92.0%1.182% OSG Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of OSG shares? During the previous two years, 186 institutional investors and hedge funds held shares of Octave Specialty Group. The most heavily invested institutionals were Glazer Capital LLC ($28.95M), Vanguard Group Inc. ($21.31M), Western Standard LLC ($19.49M), FMR LLC ($19.42M), Continental General Insurance Co. ($17.25M), Wolf Hill Capital Management LP ($14.70M), and Gendell Jeffrey L ($12.21M).Learn more on Octave Specialty Group's institutional investors. What percentage of Octave Specialty Group's stock is owned by institutional investors? 80.92% of Octave Specialty Group's stock is owned by institutional investors. Learn more on OSG's institutional investor holdings. Which institutional investors have been buying Octave Specialty Group's stock? Of the 162 institutional investors that purchased Octave Specialty Group's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Western Standard LLC ($5.60M), Glazer Capital LLC ($3.41M), Wolf Hill Capital Management LP ($3.35M), Gendell Jeffrey L ($2.17M), Continental General Insurance Co. ($2.07M), Dimensional Fund Advisors LP ($1.77M), and Prescott Group Capital Management L.L.C. ($1.59M). How much institutional buying is happening at Octave Specialty Group? Institutional investors have bought a total of 28,954,044 shares in the last 24 months. This purchase volume represents approximately $229.39M in transactions. Which of Octave Specialty Group's major shareholders have been selling company stock? Of the 29 institutional investors that sold Octave Specialty Group's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Dimensional Fund Advisors LP ($630.19K), Goldman Sachs Group Inc. ($505.52K), Squarepoint Ops LLC ($424.15K), American Century Companies Inc. ($417.93K), Tudor Investment Corp ET AL ($361.09K), Millennium Management LLC ($295.15K), and Y Intercept Hong Kong Ltd ($200.21K). How much institutional selling is happening at Octave Specialty Group? Institutional investors have sold a total of 3,814,698 shares in the last 24 months. This volume of shares sold represents approximately $30.11M in transactions. Related Companies TWFG Institutional Ownership Ategrity Specialty Institutional Ownership Trupanion Institutional Ownership Bowhead Specialty Institutional Ownership Root Institutional Ownership Heritage Insurance Institutional Ownership Hippo Institutional Ownership Yuanbao Institutional Ownership Tiptree Financial Institutional Ownership Waterdrop Institutional Ownership This page (NYSE:OSG) was last updated on 5/24/2026 by MarketBeat.com Staff. From Our PartnersHey, it's Jon Najarian. The SpaceX IPO is right around the corner. But I discovered Elon may have something BIGGER planned. Check this out before June 9th...After being invited to the SpaceX launch headquarters in Cape Canaveral from one of Elon's top lobbyists… Hall...Banyan Hill Publishing | SponsoredBetter than SpaceX? Grab this ticker instead.Larry Benedict generated $274 million for his clients by finding the trades most investors missed. 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