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Perma-Fix Environmental Services (PESI) Institutional Ownership

Perma-Fix Environmental Services logo
$13.76 -0.40 (-2.82%)
Closing price 10/9/2026 04:00 PM Eastern
Extended Trading
$13.81 +0.05 (+0.36%)
As of 10/9/2026 07:30 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.
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Institutional Ownership Changes (13F Filings) for Perma-Fix Environmental Services (NASDAQ:PESI)

Current
Institutional Ownership
Percentage
25.52%
Number of
Institutional Buyers
(last 12 months)
36
Total
Institutional Inflows
(last 12 months)
$33.37M
Number of
Institutional Sellers
(last 12 months)
15
Total
Institutional Outflows
(last 12 months)
$20.37M
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PESI Institutional Buying and Selling by Quarter

Perma-Fix Environmental Services Major Shareholders & Ownership History

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Reporting DateMajor Shareholder NameShares HeldMarket Value% of PortfolioQuarterly Change in SharesOwnership in CompanyDetails
9/9/2026Squarepoint Ops LLC30,976$443K0.0%-40.4%0.146%
8/21/2026Pale Fire Capital SE55,627$795K0.0%+14.4%0.262%
8/7/2026Diamond Hill Capital Management LLC Investment Advisor642,533$9.18M0.1%N/A3.031%
8/6/2026Bank of New York Mellon Corp38,101$544K0.0%N/A0.180%
5/19/2026Bank of America Corp DE45,190$483K0.0%+3.5%0.243%
5/15/2026Corsair Capital Management L.P.37,649$402K0.1%+73.9%0.203%
5/14/2026Pale Fire Capital SE48,626$520K0.0%+12.5%0.262%
5/7/2026Dimensional Fund Advisors LP163,787$1.75M0.0%-0.6%0.883%
5/6/2026GatePass Capital LLC29,742$318K0.1%-54.1%0.160%
5/5/2026Bank of New York Mellon Corp40,379$432K0.0%-8.4%0.218%
4/23/2026North Star Investment Management Corp.120,532$1.29M0.1%+2,639.4%0.650%
4/17/2026Capital Advisors Ltd. LLC5,000$53K0.0%N/A0.027%
2/18/2026Millennium Management LLC38,617$486K0.0%N/A0.209%
2/17/2026Mak Capital One LLC918,673$11.57M1.3%+12.6%4.960%
2/17/2026Price T Rowe Associates Inc. MD11,202$142K0.0%N/A0.060%
2/17/2026Osaic Holdings Inc.15,900$200K0.0%-55.7%0.086%
2/17/2026Corsair Capital Management L.P.21,649$273K0.0%-22.5%0.117%
2/17/2026Rothschild Wealth LLC166,300$2.09M0.2%N/A0.898%
2/16/2026Squarepoint Ops LLC36,842$464K0.0%N/A0.199%
2/16/2026MYDA Advisors LLC100,000$1.26M0.2%+100.0%0.540%
2/16/2026Barclays PLC26,981$340K0.0%+10.7%0.146%
2/13/2026State Street Corp312,267$3.93M0.0%+4.7%1.686%
2/13/2026Wells Fargo & Company MN32,126$404K0.0%+25.2%0.173%
2/12/2026Jane Street Group LLC144,239$1.82M0.0%+147.8%0.779%
2/12/2026HRT Financial LP14,585$183K0.0%N/A0.079%
2/12/2026MetLife Investment Management LLC9,154$115K0.0%+171.6%0.049%
2/12/2026Dimensional Fund Advisors LP164,787$2.08M0.0%+5.1%0.890%
2/12/2026Informed Momentum Co LLC64,784$816K0.1%N/A0.350%
2/11/2026Heartland Advisors Inc.400,000$5.04M0.3%-12.7%2.160%
2/11/2026Deutsche Bank AG11,993$151K0.0%+18,936.5%0.065%
2/11/2026Potomac Capital Management Inc.341,800$4.30M3.5%N/A1.846%
2/11/2026Los Angeles Capital Management LLC22,960$289K0.0%N/A0.124%
2/10/2026Goldman Sachs Group Inc.71,937$906K0.0%+12.0%0.388%
2/9/2026Geode Capital Management LLC422,890$5.33M0.0%+0.4%2.283%
2/6/2026Diamond Hill Capital Management Inc.386,843$4.87M0.0%-3.7%2.089%
2/5/2026ARS Investment Partners LLC36,145$455K0.0%-11.8%0.195%
2/4/2026Bailard Inc.17,800$224K0.0%-37.8%0.096%
1/29/2026Quent Capital LLC16,199$204K0.0%N/A0.087%
1/22/2026Brookwood Investment Group LLC20,873$263K0.0%+39.7%0.113%
1/8/2026Fermata Advisors LLC12,635$159K0.0%-17.5%0.068%
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1/1/2026JPMorgan Chase & Co.7,031$71K0.0%-14.0%0.038%
11/17/2025Perritt Capital Management Inc175,300$1.77M0.8%-90.6%0.947%
11/17/2025Verition Fund Management LLC14,456$146K0.0%N/A0.078%
11/17/2025Mak Capital One LLC815,576$8.24M1.3%+780.7%4.404%
11/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.8,305$84K0.0%-15.5%0.045%
11/17/2025Bank of America Corp DE47,739$482K0.0%+431.9%0.258%
11/14/2025Ancora Advisors LLC150,355$1.52M0.0%-16.8%0.814%
11/13/2025BNP Paribas Financial Markets3,350$34K0.0%+102.9%0.018%
11/13/2025Van ECK Associates Corp220,289$2.23M0.0%+27.5%1.193%
11/12/2025Dimensional Fund Advisors LP156,853$1.58M0.0%+2.9%0.849%
11/7/2025Heartland Advisors Inc.458,250$4.63M0.2%-4.8%2.481%
11/7/2025Guidance Capital Inc.17,324$175K0.0%N/A0.094%
11/7/2025Vanguard Group Inc.935,942$9.45M0.0%+2.3%5.067%
11/7/2025JPMorgan Chase & Co.7,031$71K0.0%-14.0%0.038%
11/6/2025Essex Investment Management Co. LLC196,197$1.98M0.3%+3.4%1.062%
11/5/2025Diamond Hill Capital Management Inc.401,559$4.06M0.0%+1.8%2.174%
10/29/2025GatePass Capital LLC64,742$654K0.4%-18.0%0.351%
10/28/2025Blue Square Asset Management LLC20,100$203K0.1%N/A0.109%
10/22/2025North Star Investment Management Corp.4,400$44K0.0%N/A0.024%
10/21/2025Brookwood Investment Group LLC14,943$151K0.0%+47.5%0.081%
10/15/2025ARS Investment Partners LLC40,960$414K0.0%-51.4%0.222%
8/15/2025Bank of America Corp DE8,975$94K0.0%-18.2%0.049%
8/14/2025Jane Street Group LLC22,059$232K0.0%N/A0.119%
8/14/2025Pale Fire Capital SE25,689$270K0.0%+154.9%0.139%
8/13/2025Marshall Wace LLP18,405$194K0.0%N/A0.100%
8/13/2025CW Advisors LLC30,500$321K0.0%+48.8%0.165%
8/12/2025XTX Topco Ltd18,956$199K0.0%N/A0.103%
8/12/2025Rhumbline Advisers23,525$247K0.0%+36.7%0.127%
8/11/2025ARS Investment Partners LLC84,225$886K0.1%+1.2%0.456%
8/8/2025Geode Capital Management LLC421,959$4.44M0.0%+7.3%2.287%
8/1/2025Brookwood Investment Group LLC10,134$107K0.0%-39.8%0.055%
7/9/2025Fermata Advisors LLC16,309$172K0.0%+6.1%0.088%
6/27/2025Goldman Sachs Group Inc.24,698$180K0.0%-37.5%0.134%
5/29/2025Rhumbline Advisers17,204$125K0.0%+18.4%0.093%
5/16/2025Goldman Sachs Group Inc.24,698$180K0.0%-37.5%0.134%
5/16/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.9,849$72K0.0%+18.2%0.053%
5/16/2025Alyeska Investment Group L.P.147,417$1.07M0.0%-78.9%0.800%
5/16/2025Ancora Advisors LLC157,845$1.15M0.0%+92.8%0.857%
5/15/2025Cubist Systematic Strategies LLC10,569$77K0.0%N/A0.057%
5/15/2025MYDA Advisors LLC200,000$1.45M0.3%-11.1%1.085%
5/14/2025Corebridge Financial Inc.8,284$60K0.0%+14.7%0.045%
5/14/2025Pale Fire Capital SE10,080$73K0.0%N/A0.055%
5/14/2025CW Advisors LLC20,500$149K0.0%N/A0.111%
5/12/2025Nuveen LLC16,895$123K0.0%N/A0.092%
5/9/2025Charles Schwab Investment Management Inc.46,244$336K0.0%+14.9%0.251%
5/7/2025Essex Investment Management Co. LLC191,087$1.39M0.3%-0.6%1.037%
5/7/2025Heartland Advisors Inc.455,400$3.31M0.2%+13.9%2.471%
5/7/2025Prescott Group Capital Management L.L.C.777,142$5.65M0.8%+4.0%4.217%
5/6/2025Brookwood Investment Group LLC16,844$122K0.0%N/A0.091%
5/6/2025Diamond Hill Capital Management Inc.416,662$3.03M0.0%+32.1%2.261%
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4/29/2025Bank of New York Mellon Corp33,883$246K0.0%+5.5%0.184%
4/23/2025Oppenheimer & Co. Inc.10,950$80K0.0%-51.8%0.059%
4/8/2025Rhumbline Advisers17,204$125K0.0%+18.4%0.093%
4/7/2025GAMMA Investing LLC4,587$33K0.0%N/A0.025%
2/25/2025Polar Asset Management Partners Inc.175,000$1.94M0.0%N/A1.104%
2/21/2025Prescott Group Capital Management L.L.C.746,942$8.27M1.1%+4.2%4.713%
2/18/2025AWM Investment Company Inc.400,000$4.43M0.5%N/A2.524%
2/17/2025Polar Asset Management Partners Inc.175,000$1.94M0.0%N/A1.104%
2/17/2025MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.8,334$92K0.0%+21.6%0.053%
2/17/2025Deutsche Bank AG15,479$171K0.0%+4,235.9%0.098%


PESI Institutional Ownership - Frequently Asked Questions

During the previous two years, 77 institutional investors and hedge funds held shares of Perma-Fix Environmental Services. The most heavily invested institutionals were Mak Capital One LLC ($11.57M), Vanguard Group Inc. ($9.45M), Diamond Hill Capital Management LLC Investment Advisor ($9.18M), Prescott Group Capital Management L.L.C. ($5.65M), Geode Capital Management LLC ($5.33M), Heartland Advisors Inc. ($5.04M), and Diamond Hill Capital Management Inc. ($4.87M).Learn more on Perma-Fix Environmental Services' institutional investors.

25.52% of Perma-Fix Environmental Services' stock is owned by institutional investors. Learn more on PESI's institutional investor holdings.

Of the 68 institutional investors that purchased Perma-Fix Environmental Services' stock in the last 24 months, the following investors and hedge funds have bought the highest volume of shares: Mak Capital One LLC ($826.06K), Alyeska Investment Group L.P. ($700K), Diamond Hill Capital Management LLC Investment Advisor ($642.53K), Diamond Hill Capital Management Inc. ($423.81K), AWM Investment Company Inc. ($400K), Polar Asset Management Partners Inc. ($350K), and Potomac Capital Management Inc. ($341.80K).

Institutional investors have bought a total of 2,759,441 shares in the last 24 months. This purchase volume represents approximately $33.37M in transactions.

Of the 15 institutional investors that sold Perma-Fix Environmental Services' stock in the last 24 months, the following investors and hedge funds have sold the highest volume of shares: Perritt Capital Management Inc ($1.68M), Heartland Advisors Inc. ($81.15K), GatePass Capital LLC ($49.22K), ARS Investment Partners LLC ($48.08K), Ancora Advisors LLC ($30.43K), Squarepoint Ops LLC ($20.96K), and Osaic Holdings Inc. ($20K).

Institutional investors have sold a total of 1,976,417 shares in the last 24 months. This volume of shares sold represents approximately $20.37M in transactions.


Related Companies

Institutional ownership data for NASDAQ:PESI is compiled from quarterly 13F filings submitted to the U.S. Securities and Exchange Commission (SEC), with the most recent received on 9/9/2026. New 13F filings are added each quarter as they're published.
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