Montrose Environmental Group (ONT) Institutional Ownership $16.71 +0.95 (+6.03%) As of 05/22/2026 03:58 PM Eastern Add Compare Share Share Ownership Stock AnalysisAnalyst ForecastsChartCompetitorsEarningsFinancialsHeadlinesInsider TradesOptions ChainOwnershipSEC FilingsShort InterestTrendsBuy This Stock Institutional Ownership Changes (13F Filings) for Montrose Environmental Group (NYSE:ONT)CurrentInstitutional OwnershipPercentage87.87%Number ofInstitutional Buyers(last 12 months)113TotalInstitutional Inflows(last 12 months)$174.02MNumber ofInstitutional Sellers(last 12 months)69TotalInstitutional Outflows(last 12 months)$175.37M Get ONT Insider Trade Alerts Want to know when executives and insiders are buying or selling Montrose Environmental Group 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 ONT Institutional Buying and Selling by Quarter Montrose Environmental Group Major Shareholders & Ownership History ExportReporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails5/5/2026 Hillsdale Investment Management Inc.11,500$252K0.0%+3,733.3%0.032% 5/4/2026 Principal Financial Group Inc.1,346,257$29.47M0.0%+5.2%3.722% 5/1/2026 Fifth Third Bancorp9,199$201K0.0%N/A0.025% 4/30/2026 Hsbc Holdings PLC15,228$328K0.0%+41.9%0.042% 4/30/2026 Horrell Capital Management Inc.22,337$489K0.2%-8.2%0.062% 4/28/2026 Stephens Investment Management Group LLC694,980$15.21M0.2%-1.4%1.921% 4/24/2026 Conestoga Capital Advisors LLC83,515$1.83M0.0%+16.8%0.231% 4/24/2026 Peregrine Capital Management LLC268,781$5.88M0.2%-4.1%0.743% 4/20/2026 OP Asset Management Ltd156,157$3.42M0.0%N/A0.432% 4/16/2026 SG Americas Securities LLC22,471$492K0.0%-2.2%0.062% Get the Latest News and Ratings for ONT and Related StocksEnter your email address below to receive the latest news and analysts' ratings for Montrose Environmental Group and its competitors with MarketBeat's FREE daily newsletter. 3/20/2026 Hsbc Holdings PLC10,735$266K0.0%-31.7%0.030% 3/17/2026 Rockefeller Capital Management L.P.127,935$3.18M0.0%-3.6%0.356% 2/19/2026 Invesco Ltd.170,650$4.24M0.0%+17.6%0.483% 2/18/2026 XTX Topco Ltd15,544$386K0.0%N/A0.044% 2/18/2026 Tudor Investment Corp ET AL168,699$4.19M0.0%+16.4%0.477% 2/18/2026 Numerai GP LLC10,238$254K0.0%N/A0.029% 2/18/2026 Millennium Management LLC71,586$1.78M0.0%-70.6%0.203% 2/18/2026 Janus Henderson Group PLC763,892$18.97M0.0%-4.0%2.162% 2/18/2026 Gotham Asset Management LLC27,719$688K0.0%N/A0.078% 2/18/2026 Engineers Gate Manager LP59,682$1.48M0.0%+28.0%0.169% 2/17/2026 AQR Capital Management LLC215,738$5.36M0.0%+26.4%0.610% 2/17/2026 Cetera Investment Advisers8,082$201K0.0%-8.0%0.023% 2/17/2026 ArrowMark Colorado Holdings LLC269,413$6.69M0.1%-2.9%0.762% 2/17/2026 Quantedge Capital Pte Ltd16,400$407K0.2%+74.5%0.046% 2/17/2026 Trexquant Investment LP174,541$4.33M0.0%-15.9%0.494% 2/17/2026 Jump Financial LLC12,300$305K0.0%-28.3%0.035% 2/17/2026 Price T Rowe Associates Inc. MD25,787$641K0.0%+4.7%0.073% 2/17/2026 Russell Investments Group Ltd.198,017$4.92M0.0%+6.7%0.560% 2/17/2026 Granahan Investment Management LLC199,317$4.95M0.2%+119.7%0.564% 2/17/2026 Kemnay Advisory Services Inc.4,165$103K0.0%N/A0.012% 2/17/2026 Fred Alger Management LLC1,068,555$26.53M0.1%-7.1%3.024% 2/17/2026 Royal Bank of Canada30,978$770K0.0%-52.1%0.088% 2/17/2026 Blair William & Co. IL340,869$8.46M0.0%+3.6%0.965% 2/17/2026 Graham Capital Management L.P.16,342$406K0.0%+9.2%0.046% 2/16/2026 Squarepoint Ops LLC44,461$1.10M0.0%-56.1%0.126% 2/16/2026 Venture Visionary Partners LLC16,176$402K0.0%N/A0.046% 2/16/2026 Verition Fund Management LLC25,500$633K0.0%-14.0%0.072% 2/16/2026 Panagora Asset Management Inc.130,693$3.25M0.0%+27.5%0.370% 2/16/2026 Mariner LLC41,697$1.04M0.0%+112.7%0.118% 2/16/2026 Cladis Investment Advisory LLC58,400$1.45M0.8%-5.7%0.165% 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 Dixon Mitchell Investment Counsel Inc.3,033$75K0.0%N/A0.009% 2/16/2026 Barclays PLC73,486$1.83M0.0%+47.8%0.208% 2/13/2026 Marshall Wace LLP109,058$2.71M0.0%-60.7%0.309% 2/13/2026 The Manufacturers Life Insurance Company 9,960$247K0.0%-9.1%0.028% 2/13/2026 CANADA LIFE ASSURANCE Co2,909$72K0.0%-87.2%0.008% 2/13/2026 Stifel Financial Corp28,132$699K0.0%-4.1%0.080% 2/13/2026 Virtus Advisers LLC20,100$499K0.2%N/A0.057% 2/13/2026 Bridgefront Capital LLC8,666$215K0.1%N/A0.025% 2/13/2026 Essex Investment Management Co. LLC109,513$2.72M0.4%-2.2%0.310% 2/13/2026 Charles Schwab Investment Management Inc.274,477$6.82M0.0%+0.4%0.777% 2/13/2026 Ieq Capital LLC30,358$754K0.0%+35.2%0.086% 2/13/2026 Dynamic Technology Lab Private Ltd10,960$272K0.1%-30.2%0.031% 2/13/2026 UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC1,457,574$36.19M0.0%+14.1%4.124% 2/13/2026 Wells Fargo & Company MN72,054$1.79M0.0%+18.8%0.204% 2/12/2026 Dimensional Fund Advisors LP698,089$17.34M0.0%+15.0%1.975% 2/12/2026 Marex Group plc12,000$298K0.0%N/A0.034% 2/12/2026 IQ EQ FUND MANAGEMENT IRELAND Ltd49,443$1.23M0.1%+19.5%0.140% 2/12/2026 Swiss National Bank66,100$1.64M0.0%+4.9%0.187% 2/12/2026 Nuveen LLC516,952$12.84M0.0%-15.4%1.463% 2/11/2026 Deutsche Bank AG28,877$717K0.0%+6.8%0.082% 2/11/2026 LPL Financial LLC12,533$311K0.0%N/A0.035% 2/11/2026 Franklin Resources Inc.33,672$836K0.0%-4.3%0.095% 2/11/2026 CenterBook Partners LP110,820$2.75M0.1%+17.6%0.314% 2/11/2026 Los Angeles Capital Management LLC15,785$410K0.0%+83.2%0.045% 2/11/2026 Global Alpha Capital Management Ltd.143,382$3.56M0.2%-18.2%0.406% 2/10/2026 Goldman Sachs Group Inc.1,733,003$43.03M0.0%+128.9%4.904% 2/10/2026 Natixis Advisors LLC26,345$654K0.0%-2.3%0.075% 2/10/2026 Jupiter Asset Management Ltd.14,382$357K0.0%N/A0.041% 2/10/2026 Intech Investment Management LLC13,981$347K0.0%+14.6%0.040% 2/9/2026 Geode Capital Management LLC774,877$19.24M0.0%+1.3%2.193% 2/9/2026 Royce & Associates LP787,535$19.55M0.2%-10.0%2.228% 2/9/2026 Fisher Asset Management LLC352,569$8.75M0.0%+36.7%0.998% 2/9/2026 Legal & General Group Plc638,630$15.86M0.0%+3.7%1.807% 2/6/2026 Legato Capital Management LLC35,151$873K0.1%-38.8%0.099% 2/6/2026 Summit Creek Advisors LLC628,786$15.61M2.5%+10.6%1.779% 2/6/2026 PNC Financial Services Group Inc.4,804$119K0.0%+39.4%0.014% 2/5/2026 Stephens Investment Management Group LLC704,702$17.50M0.2%+6.6%1.994% 2/4/2026 Versor Investments LP22,750$565K0.1%+69.8%0.064% 2/3/2026 Horrell Capital Management Inc.24,330$604K0.3%-3.4%0.069% 2/2/2026 Truist Financial Corp803,926$19.96M0.0%-0.2%2.275% 2/2/2026 Hussman Strategic Advisors Inc.42,000$1.04M0.3%N/A0.119% 2/2/2026 Conestoga Capital Advisors LLC71,475$1.78M0.0%+2.6%0.202% 2/2/2026 Oppenheimer Asset Management Inc.11,752$292K0.0%-26.3%0.033% 1/29/2026Comerica Bank12,137$301K0.0%-33.7%0.034% 1/29/2026Vanguard Group Inc.1,986,620$49.33M0.0%+3.0%5.621% 1/28/2026 Peregrine Capital Management LLC280,171$6.96M0.2%-1.3%0.793% 1/28/2026 Universal Beteiligungs und Servicegesellschaft mbH116,415$2.89M0.0%+63.3%0.329% 1/27/2026 Zurcher Kantonalbank Zurich Cantonalbank14,860$369K0.0%+44.5%0.042% 1/27/2026 MASTERINVEST Kapitalanlage GmbH22,822$584K0.1%-2.9%0.065% 1/26/2026 CWM LLC8,324$207K0.0%+8.6%0.024% 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 yourself1/23/2026 Assetmark Inc.3,397$84K0.0%N/A0.010% 1/20/2026 Harbor Capital Advisors Inc.33,311$827K0.1%+100.5%0.094% 1/15/2026 Allspring Global Investments Holdings LLC408,364$10.14M0.0%N/A1.156% 1/14/2026 Exchange Traded Concepts LLC4,258$106K0.0%-11.9%0.012% 1/9/2026 SG Americas Securities LLC22,980$571K0.0%-44.3%0.065% 1/8/2026 Nordea Investment Management AB55,879$1.38M0.0%N/A0.158% 1/1/2026 JPMorgan Chase & Co.15,949$438K0.0%-14.0%0.045% 1/1/2026 Tudor Investment Corp ET AL144,897$3.98M0.0%N/A0.410% 12/23/2025 Triumph Capital Management11,209$308K0.1%N/A0.032% 12/9/2025 Tudor Investment Corp ET AL144,897$3.98M0.0%N/A0.410% ONT Institutional Ownership - Frequently Asked Questions Who are the largest shareholders of ONT shares? During the previous two years, 207 institutional investors and hedge funds held shares of Montrose Environmental Group. The most heavily invested institutionals were Bamco Inc. NY ($59.33M), Driehaus Capital Management LLC ($51.21M), Vanguard Group Inc. ($49.33M), Goldman Sachs Group Inc. ($43.03M), UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC ($36.19M), William Blair Investment Management LLC ($35.98M), and Principal Financial Group Inc. ($29.47M).Learn more on Montrose Environmental Group's institutional investors. What percentage of Montrose Environmental Group's stock is owned by institutional investors? 87.87% of Montrose Environmental Group's stock is owned by institutional investors. Learn more on ONT's institutional investor holdings. Which institutional investors have been buying Montrose Environmental Group's stock? Of the 188 institutional investors that purchased Montrose Environmental Group's stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: William Blair Investment Management LLC ($1.35M), Alliancebernstein L.P. ($1.25M), Bamco Inc. NY ($1.20M), Goldman Sachs Group Inc. ($1.16M), Driehaus Capital Management LLC ($823.64K), Fred Alger Management LLC ($679.49K), and Wellington Management Group LLP ($661.45K). How much institutional buying is happening at Montrose Environmental Group? Institutional investors have bought a total of 7,260,368 shares in the last 24 months. This purchase volume represents approximately $174.02M in transactions. Which of Montrose Environmental Group's major shareholders have been selling company stock? Of the 69 institutional investors that sold Montrose Environmental Group's stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: William Blair Investment Management LLC ($1.01M), Bank of America Corp DE ($877.44K), Millennium Management LLC ($722.16K), Granite Investment Partners LLC ($699.36K), Bamco Inc. NY ($603.93K), UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC ($480.09K), and Alliancebernstein L.P. ($294.78K). How much institutional selling is happening at Montrose Environmental Group? Institutional investors have sold a total of 6,809,349 shares in the last 24 months. This volume of shares sold represents approximately $175.37M in transactions. 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