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Montrose Environmental Group (ONT) Institutional Ownership

Montrose Environmental Group logo
$13.24 -0.02 (-0.15%)
As of 10/13/2026 03:58 PM Eastern
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Institutional Ownership Changes (13F Filings) for Montrose Environmental Group (NYSE:ONT)

Current
Institutional Ownership
Percentage
87.87%
Number of
Institutional Buyers
(last 12 months)
90
Total
Institutional Inflows
(last 12 months)
$110.73M
Number of
Institutional Sellers
(last 12 months)
63
Total
Institutional Outflows
(last 12 months)
$139.01M
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ONT Institutional Buying and Selling by Quarter

Montrose Environmental Group Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
5/5/2026Hillsdale Investment Management Inc.11,500$252K0.0%+3,733.3%0.032%
5/4/2026Principal Financial Group Inc.1,346,257$29.47M0.0%+5.2%3.722%
5/1/2026Fifth Third Bancorp9,199$201K0.0%N/A0.025%
4/30/2026Hsbc Holdings PLC15,228$328K0.0%+41.9%0.042%
4/30/2026Horrell Capital Management Inc.22,337$489K0.2%-8.2%0.062%
4/28/2026Stephens Investment Management Group LLC694,980$15.21M0.2%-1.4%1.921%
4/24/2026Conestoga Capital Advisors LLC83,515$1.83M0.0%+16.8%0.231%
4/24/2026Peregrine Capital Management LLC268,781$5.88M0.2%-4.1%0.743%
4/20/2026OP Asset Management Ltd156,157$3.42M0.0%N/A0.432%
4/16/2026SG Americas Securities LLC22,471$492K0.0%-2.2%0.062%
3/20/2026Hsbc Holdings PLC10,735$266K0.0%-31.7%0.030%
3/17/2026Rockefeller Capital Management L.P.127,935$3.18M0.0%-3.6%0.356%
2/19/2026Invesco Ltd.170,650$4.24M0.0%+17.6%0.483%
2/18/2026XTX Topco Ltd15,544$386K0.0%N/A0.044%
2/18/2026Tudor Investment Corp ET AL168,699$4.19M0.0%+16.4%0.477%
2/18/2026Numerai GP LLC10,238$254K0.0%N/A0.029%
2/18/2026Millennium Management LLC71,586$1.78M0.0%-70.6%0.203%
2/18/2026Janus Henderson Group PLC763,892$18.97M0.0%-4.0%2.162%
2/18/2026Gotham Asset Management LLC27,719$688K0.0%N/A0.078%
2/18/2026Engineers Gate Manager LP59,682$1.48M0.0%+28.0%0.169%
2/17/2026AQR Capital Management LLC215,738$5.36M0.0%+26.4%0.610%
2/17/2026Cetera Investment Advisers8,082$201K0.0%-8.0%0.023%
2/17/2026ArrowMark Colorado Holdings LLC269,413$6.69M0.1%-2.9%0.762%
2/17/2026Quantedge Capital Pte Ltd16,400$407K0.2%+74.5%0.046%
2/17/2026Trexquant Investment LP174,541$4.33M0.0%-15.9%0.494%
2/17/2026Jump Financial LLC12,300$305K0.0%-28.3%0.035%
2/17/2026Price T Rowe Associates Inc. MD25,787$641K0.0%+4.7%0.073%
2/17/2026Russell Investments Group Ltd.198,017$4.92M0.0%+6.7%0.560%
2/17/2026Granahan Investment Management LLC199,317$4.95M0.2%+119.7%0.564%
2/17/2026Kemnay Advisory Services Inc.4,165$103K0.0%N/A0.012%
2/17/2026Fred Alger Management LLC1,068,555$26.53M0.1%-7.1%3.024%
2/17/2026Royal Bank of Canada30,978$770K0.0%-52.1%0.088%
2/17/2026Blair William & Co. IL340,869$8.46M0.0%+3.6%0.965%
2/17/2026Graham Capital Management L.P.16,342$406K0.0%+9.2%0.046%
2/16/2026Squarepoint Ops LLC44,461$1.10M0.0%-56.1%0.126%
2/16/2026Venture Visionary Partners LLC16,176$402K0.0%N/A0.046%
2/16/2026Verition Fund Management LLC25,500$633K0.0%-14.0%0.072%
2/16/2026Panagora Asset Management Inc.130,693$3.25M0.0%+27.5%0.370%
2/16/2026Mariner LLC41,697$1.04M0.0%+112.7%0.118%
2/16/2026Cladis Investment Advisory LLC58,400$1.45M0.8%-5.7%0.165%
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2/16/2026Dixon Mitchell Investment Counsel Inc.3,033$75K0.0%N/A0.009%
2/16/2026Barclays PLC73,486$1.83M0.0%+47.8%0.208%
2/13/2026Marshall Wace LLP109,058$2.71M0.0%-60.7%0.309%
2/13/2026The Manufacturers Life Insurance Company 9,960$247K0.0%-9.1%0.028%
2/13/2026CANADA LIFE ASSURANCE Co2,909$72K0.0%-87.2%0.008%
2/13/2026Stifel Financial Corp28,132$699K0.0%-4.1%0.080%
2/13/2026Virtus Advisers LLC20,100$499K0.2%N/A0.057%
2/13/2026Bridgefront Capital LLC8,666$215K0.1%N/A0.025%
2/13/2026Essex Investment Management Co. LLC109,513$2.72M0.4%-2.2%0.310%
2/13/2026Charles Schwab Investment Management Inc.274,477$6.82M0.0%+0.4%0.777%
2/13/2026Ieq Capital LLC30,358$754K0.0%+35.2%0.086%
2/13/2026Dynamic Technology Lab Private Ltd10,960$272K0.1%-30.2%0.031%
2/13/2026UBS AM a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC1,457,574$36.19M0.0%+14.1%4.124%
2/13/2026Wells Fargo & Company MN72,054$1.79M0.0%+18.8%0.204%
2/12/2026Dimensional Fund Advisors LP698,089$17.34M0.0%+15.0%1.975%
2/12/2026Marex Group plc12,000$298K0.0%N/A0.034%
2/12/2026IQ EQ FUND MANAGEMENT IRELAND Ltd49,443$1.23M0.1%+19.5%0.140%
2/12/2026Swiss National Bank66,100$1.64M0.0%+4.9%0.187%
2/12/2026Nuveen LLC516,952$12.84M0.0%-15.4%1.463%
2/11/2026Deutsche Bank AG28,877$717K0.0%+6.8%0.082%
2/11/2026LPL Financial LLC12,533$311K0.0%N/A0.035%
2/11/2026Franklin Resources Inc.33,672$836K0.0%-4.3%0.095%
2/11/2026CenterBook Partners LP110,820$2.75M0.1%+17.6%0.314%
2/11/2026Los Angeles Capital Management LLC15,785$410K0.0%+83.2%0.045%
2/11/2026Global Alpha Capital Management Ltd.143,382$3.56M0.2%-18.2%0.406%
2/10/2026Goldman Sachs Group Inc.1,733,003$43.03M0.0%+128.9%4.904%
2/10/2026Natixis Advisors LLC26,345$654K0.0%-2.3%0.075%
2/10/2026Jupiter Asset Management Ltd.14,382$357K0.0%N/A0.041%
2/10/2026Intech Investment Management LLC13,981$347K0.0%+14.6%0.040%
2/9/2026Geode Capital Management LLC774,877$19.24M0.0%+1.3%2.193%
2/9/2026Royce & Associates LP787,535$19.55M0.2%-10.0%2.228%
2/9/2026Fisher Asset Management LLC352,569$8.75M0.0%+36.7%0.998%
2/9/2026Legal & General Group Plc638,630$15.86M0.0%+3.7%1.807%
2/6/2026Legato Capital Management LLC35,151$873K0.1%-38.8%0.099%
2/6/2026Summit Creek Advisors LLC628,786$15.61M2.5%+10.6%1.779%
2/6/2026PNC Financial Services Group Inc.4,804$119K0.0%+39.4%0.014%
2/5/2026Stephens Investment Management Group LLC704,702$17.50M0.2%+6.6%1.994%
2/4/2026Versor Investments LP22,750$565K0.1%+69.8%0.064%
2/3/2026Horrell Capital Management Inc.24,330$604K0.3%-3.4%0.069%
2/2/2026Truist Financial Corp803,926$19.96M0.0%-0.2%2.275%
2/2/2026Hussman Strategic Advisors Inc.42,000$1.04M0.3%N/A0.119%
2/2/2026Conestoga Capital Advisors LLC71,475$1.78M0.0%+2.6%0.202%
2/2/2026Oppenheimer 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%
1/28/2026Peregrine Capital Management LLC280,171$6.96M0.2%-1.3%0.793%
1/28/2026Universal Beteiligungs und Servicegesellschaft mbH116,415$2.89M0.0%+63.3%0.329%
1/27/2026Zurcher Kantonalbank Zurich Cantonalbank14,860$369K0.0%+44.5%0.042%
1/27/2026MASTERINVEST Kapitalanlage GmbH22,822$584K0.1%-2.9%0.065%
1/26/2026CWM LLC8,324$207K0.0%+8.6%0.024%
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1/23/2026Assetmark Inc.3,397$84K0.0%N/A0.010%
1/20/2026Harbor Capital Advisors Inc.33,311$827K0.1%+100.5%0.094%
1/15/2026Allspring Global Investments Holdings LLC408,364$10.14M0.0%N/A1.156%
1/14/2026Exchange Traded Concepts LLC4,258$106K0.0%-11.9%0.012%
1/9/2026SG Americas Securities LLC22,980$571K0.0%-44.3%0.065%
1/8/2026Nordea Investment Management AB55,879$1.38M0.0%N/A0.158%
1/1/2026JPMorgan Chase & Co.15,949$438K0.0%-14.0%0.045%
1/1/2026Tudor Investment Corp ET AL144,897$3.98M0.0%N/A0.410%
12/23/2025Triumph Capital Management11,209$308K0.1%N/A0.032%
12/9/2025Tudor Investment Corp ET AL144,897$3.98M0.0%N/A0.410%


ONT Institutional Ownership - Frequently Asked Questions

During the previous two years, 197 institutional investors and hedge funds held shares of Montrose Environmental Group. The most heavily invested institutionals were Bamco Inc. NY ($59.33M), 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), Principal Financial Group Inc. ($29.47M), and Alliancebernstein L.P. ($27.13M).Learn more on Montrose Environmental Group's institutional investors.

87.87% of Montrose Environmental Group's stock is owned by institutional investors. Learn more on ONT's institutional investor holdings.

Of the 175 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), Wellington Management Group LLP ($661.45K), Royce & Associates LP ($638.31K), and Millennium Management LLC ($559.49K).

Institutional investors have bought a total of 4,340,493 shares in the last 24 months. This purchase volume represents approximately $110.73M in transactions.

Of the 63 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), Millennium Management LLC ($722.16K), Bamco Inc. NY ($603.93K), UBS AM A Distinct Business Unit of UBS Asset Management Americas LLC ($480.09K), Alliancebernstein L.P. ($294.78K), Legal & General Group Plc ($288.24K), and Marshall Wace LLP ($274.60K).

Institutional investors have sold a total of 5,150,924 shares in the last 24 months. This volume of shares sold represents approximately $139.01M in transactions.


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Institutional ownership data for NYSE:ONT is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 5/5/2026. New 13F filings are added each quarter as they're published.
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