PERMA-FIX ENVIRONMENTAL SVCS (PESI) Institutional Shareholders
PERMA-FIX ENVIRONMENTAL SVCS (PESI) is currently reported in institutional portfolios tracked by InsiderSet based on the latest available SEC Form 13F filings for the quarter ended June 30, 2026. The institutional investors covered on this page collectively reported approximately $81.46M in PESI holdings during the latest filing period.
Blackrock, Inc. is currently the largest disclosed institutional shareholder of PESI tracked by InsiderSet, reporting ownership valued at approximately $12.51M in its March 31, 2026 SEC Form 13F filing. Based on current market prices and the latest disclosed share count, the position is now estimated to be worth approximately $19.64M, representing an estimated gain of +56.97% since the filing period.
The top 10 institutional shareholders tracked on this page collectively account for approximately 75% of the total disclosed PESI value among the investors covered in this analysis. Major shareholders include Blackrock, Inc., Mak Capital One Llc, Prescott Group Capital Management, L.L.C., and several other long-term asset managers with concentrated positions in PERMA-FIX ENVIRONMENTAL SVCS (PESI).
This page ranks the largest institutional PESI shareholders using publicly disclosed SEC Form 13F data, including reported values, estimated current holding values, portfolio allocation percentages, ownership concentration metrics, and historical holding changes across major hedge funds and investment firms.
Institutional Holders
81
Total Reported Value
$81.46M
Largest Holder
Blackrock, Inc.
Largest Position
$12.51M
Insider Transactions (90d)
8
Latest Filing Quarter
Q2 2026
New Institutional Positions
99
Funds Exiting Positions
0
| Name | Investor/Manager | Portfolio % | Quantity | Reported Balance | Current Estimated Value | Gain/loss Since Filing | Estimated Portfolio Performance |
|---|---|---|---|---|---|---|---|
| Blackrock, Inc. | 0.00% | 1,170,303 | $12,510,539 | $19,637,684 | +$7,127,145 | +56.97% | |
| Mak Capital One Llc | 1.63% | 918,673 | $9,820,614 | $15,415,333 | +$5,594,719 | +56.97% | |
| Prescott Group Capital Management, L.L.C. | 0.83% | 777,142 | $8,307,648 | $13,040,443 | +$4,732,795 | +56.97% | |
| Vanguard Capital Management Llc | 0.00% | 759,435 | $8,118,360 | $12,743,319 | +$4,624,959 | +56.97% | |
| Geode Capital Management, Llc | 0.00% | 432,701 | $4,626,994 | $7,260,723 | +$2,633,729 | +56.92% | |
| Heartland Advisors Inc | 0.22% | 400,000 | $4,276,000 | $6,712,000 | +$2,436,000 | +56.97% | |
| Diamond Hill Capital Management Inc | 0.02% | 355,978 | $3,805,405 | $5,973,311 | +$2,167,906 | +56.97% | |
| State Street Corp | 0.00% | 335,547 | $3,586,997 | $5,630,479 | +$2,043,482 | +56.97% | |
| Potomac Capital Management, Inc. | 2.77% | 296,700 | $3,171,723 | $4,978,626 | +$1,806,903 | +56.97% | |
| Group One Trading Llc | 0.09% | 247,674 | $2,647,635 | $4,155,970 | +$1,508,335 | +56.97% | |
| Dimensional Fund Advisors Lp | 0.00% | 163,787 | $1,750,465 | $2,748,346 | +$997,881 | +57.01% | |
| North Star Investment Management Corp. | 0.09% | 120,532 | $1,722,402 | $2,022,527 | +$300,125 | +17.42% | |
| Goldman Sachs Group Inc | 0.00% | 142,687 | $1,525,324 | $2,394,288 | +$868,964 | +56.97% | |
| Northern Trust Corp | 0.00% | 129,568 | $1,385,082 | $2,174,151 | +$789,069 | +56.97% | |
| Myda Advisors Llc | 0.30% | 120,000 | $1,282,800 | $2,013,600 | +$730,800 | +56.97% | |
| Vanguard Fiduciary Trust Co | 0.00% | 119,253 | $1,274,815 | $2,001,065 | +$726,250 | +56.97% | |
| Vanguard Portfolio Management Llc | 0.00% | 100,318 | $1,072,399 | $1,683,336 | +$610,937 | +56.97% | |
| Citadel Advisors Llc | 0.00% | 69,313 | $740,956 | $1,163,072 | +$422,116 | +56.97% | |
| D. E. Shaw & Co., Inc. | 0.00% | 62,989 | $673,352 | $1,056,955 | +$383,603 | +56.97% | |
| Ubs Group Ag | 0.00% | 62,082 | $663,657 | $1,041,736 | +$378,079 | +56.97% | |
| Gatepass Capital, Llc | 0.24% | 44,742 | $639,358 | $750,771 | +$111,413 | +17.43% | |
| Squarepoint Ops Llc | 0.00% | 51,940 | $555,239 | $871,553 | +$316,314 | +56.97% | |
| Pale Fire Capital Se | 0.05% | 48,626 | $519,812 | $815,944 | +$296,132 | +56.97% | |
| Bank Of America Corp | 0.00% | 45,190 | $483,081 | $758,288 | +$275,207 | +56.97% | |
| Charles Schwab Investment Management Inc | 0.00% | 43,590 | $465,977 | $731,440 | +$265,463 | +56.97% | |
| Bank Of New York Mellon Corp | 0.00% | 40,379 | $431,647 | $677,560 | +$245,913 | +56.97% | |
| Corsair Capital Management, L.P. | 0.06% | 37,649 | $402,468 | $631,750 | +$229,282 | +56.97% | |
| Simplex Trading, Llc | 0.01% | 31,318 | $334,789 | $525,516 | +$190,727 | +56.97% | |
| Jane Street Group, Llc | 0.00% | 28,525 | $304,932 | $478,650 | +$173,718 | +56.97% | |
| Morgan Stanley | 0.00% | 26,718 | $285,615 | $448,328 | +$162,713 | +56.97% | |
| Guidance Capital, Inc | 0.05% | 16,683 | $256,418 | $279,941 | +$23,523 | +9.17% | |
| Bailard, Inc. | 0.01% | 17,800 | $254,362 | $298,684 | +$44,322 | +17.42% | |
| Xtx Topco Ltd | 0.00% | 23,227 | $248,297 | $389,749 | +$141,452 | +56.97% | |
| Oxler Private Wealth Llc | 0.07% | 17,005 | $243,002 | $285,344 | +$42,342 | +17.42% | |
| Nuveen, Llc | 0.00% | 22,454 | $240,033 | $376,778 | +$136,745 | +56.97% | |
| Rhumbline Advisers | 0.00% | 21,410 | $228,865 | $359,260 | +$130,395 | +56.97% | |
| Wells Fargo & Company/Mn | 0.00% | 20,830 | $222,673 | $349,527 | +$126,854 | +56.97% | |
| Rothschild Wealth Llc | 0.02% | 20,600 | $220,214 | $345,668 | +$125,454 | +56.97% | |
| Brown Advisory Inc | 0.00% | 20,000 | $213,800 | $335,600 | +$121,800 | +56.97% | |
| Imc-Chicago, Llc | 0.00% | 16,933 | $181,014 | $284,136 | +$103,122 | +56.97% | |
| Quent Capital, Llc | 0.01% | 16,199 | $173,167 | $271,819 | +$98,652 | +56.97% | |
| Osaic Holdings, Inc. | 0.00% | 16,000 | $171,040 | $268,480 | +$97,440 | +56.97% | |
| Deutsche Bank Ag\ | 0.00% | 14,621 | $156,298 | $245,340 | +$89,042 | +56.97% | |
| Greenhaven Road Investment Management, L.P. | 0.08% | 11,303 | $120,452 | $189,664 | +$69,212 | +57.46% | |
| Invesco Ltd. | 0.00% | 11,135 | $119,033 | $186,845 | +$67,812 | +56.97% | |
| Susquehanna International Group, Llp | 0.00% | 11,098 | $118,638 | $186,224 | +$67,586 | +56.97% | |
| Citigroup Inc | 0.00% | 8,239 | $117,735 | $138,250 | +$20,515 | +17.43% | |
| American Century Companies Inc | 0.00% | 10,692 | $114,298 | $179,412 | +$65,114 | +56.97% | |
| Vident Advisory, Llc | 0.00% | 10,390 | $111,069 | $174,344 | +$63,275 | +56.97% | |
| Mirae Asset Global Etfs Holdings Ltd. | 0.00% | 8,223 | $87,904 | $137,982 | +$50,078 | +56.97% |
Frequently asked questions about PESI
Who owns the most PESI stock?
The largest holders of PESI are typically major institutional investors such as asset managers and hedge funds reporting on Form 13F. The table above ranks tracked superinvestors by reported position size using the latest available filings for PERMA-FIX ENVIRONMENTAL SVCS (PESI).
Is PESI widely held by superinvestors?
Many widely followed stocks like PESI appear across numerous superinvestor portfolios because of liquidity, index inclusion, and fundamentals. The holder count and table above show how broadly PESI is represented among the institutional managers we track.
What do “Current Estimated Value”, “Gain/loss Since Filing”, and “Estimated Portfolio Performance” mean?
Current Estimated Value is reported share quantity from the latest 13F times our most recent split-adjusted U.S. session close. Gain/loss Since Filing is that estimate minus the reported 13F dollar value; Estimated Portfolio Performance is that difference as a percent of the reported value. Green means the estimate is above the filing value; red means below (not purchase cost). If many filers share the same implied filing price per share, the performance % may match across rows. These are not official fund marks or live quotes.