Perma-Fix Environmental Services, Inc.
Perma-Fix Environmental Services, Inc. (PESI) Stock Ownership
Institutional vs insider vs public ownership from 13F and float data — top holders, activity, and insider trades below.
SEC 13F · FMP · PESI · as of Sep 30, 2025
Ownership Breakdown
81
Institutional Holders
▲ 9 vs Q2
$75.01M
Total Inst. Value
▲ $4.62M vs Q2
18.56M
Shares Outstanding
freeFloat 92.41%
7.42M
13F Shares Held
▲ 729,256 vs Q2
Institutional ownership = 13F shares ÷ total outstanding. Insider % = 100 − free float. Public % = free float − institution %. Data: FMP /symbol-positions-summary + /shares-float + SEC EDGAR.
Top Institutional Holders
PESI largest shareholders · institutional ownership
Q3 2025 · SEC 13F
Showing top 10 holders
| Holder | Shares | % Owned | Weight | Value | Reported | Change |
|---|---|---|---|---|---|---|
BLACKROCK, INC. hazardous waste management | 1.17M | 6.33% | 6.33% | $11.79B | Nov 12, 2025 | ▼ 12.8K |
VANGUARD GROUP INC hazardous waste management | 935.9K | 5.07% | 5.07% | $9.45B | Nov 7, 2025 | ▲ 21.3K |
MAK CAPITAL ONE LLC hazardous waste management | 815.6K | 4.42% | 4.42% | $8.24B | Nov 14, 2025 | ▲ 723.0K |
PRESCOTT GROUP CAPITAL MANAGEMENT, L.L.C. hazardous waste management | 777.1K | 4.21% | 4.21% | $7.85B | Nov 6, 2025 | — held |
HEARTLAND ADVISORS INC hazardous waste management | 458.3K | 2.48% | 2.48% | $4.63B | Nov 7, 2025 | ▼ 22.9K |
GEODE CAPITAL MANAGEMENT, LLC hazardous waste management | 421.2K | 2.28% | 2.28% | $4.26B | Nov 12, 2025 | ▼ 724 |
DIAMOND HILL CAPITAL MANAGEMENT INC hazardous waste management | 401.6K | 2.18% | 2.18% | $4.06B | Nov 5, 2025 | ▲ 7.1K |
STATE STREET CORP hazardous waste management | 298.4K | 1.62% | 1.62% | $3.01B | Nov 14, 2025 | ▲ 9.9K |
VAN ECK ASSOCIATES CORP hazardous waste management | 220.3K | 1.19% | 1.19% | $2.23B | Nov 13, 2025 | ▲ 47.5K |
ESSEX INVESTMENT MANAGEMENT CO LLC hazardous waste management | 196.2K | 1.06% | 1.06% | $1.98B | Nov 6, 2025 | ▲ 6.5K |
Data from SEC Form 13F filings. Ownership bar normalised to largest holder. Change flags: isNew / isSoldOut / changeInSharesNumber (FMP extract-analytics/holder).
Institutional Activity
Q3 2025 vs prior quarter
Q3 2025
23
Increased
+1.13M shares7
New Positions
first time holders15
Decreased
−195.1K shares0
Sold Out
fully exitedNet shares change (top 50)
+936.1K
+1.13M / −195.1K
Net new holders
+15
7 new / 0 exited
Based on top 50 institutional holders by position size. Fields: isNew, isSoldOut, changeInSharesNumber (FMP extract-analytics/holder, limit=50).
Insider Buying vs Selling
PESI insider trading · insider activity
Source: SEC Form 4
7
Buy transactions
0
Sell transactions
0.00
Buy/Sell ratio
$0M
Total disposed
Recent Insider Transactions
Showing 10 most recent · Common Stock only
| Name · Role | Date | Type | Shares | Price | Value | After Trans. | Filing |
|---|---|---|---|---|---|---|---|
ZWECKER MARK A director | Apr 1, 2026 | Award | 1,520 | $8.02 | $12.2K | 244.0K | Form 4 ↗ |
REEDER JOE director | Apr 1, 2026 | Award | 1,886 | $8.02 | $15.1K | 237.9K | Form 4 ↗ |
Duggan Kerry C director | Apr 1, 2026 | Award | 1,054 | $8.02 | $8.5K | 6.8K | Form 4 ↗ |
Grumski Joseph Timothy director | Apr 1, 2026 | Award | 2,105 | $8.02 | $16.9K | 66.1K | Form 4 ↗ |
Bostick Thomas director | Apr 1, 2026 | Award | 1,559 | $8.02 | $12.5K | 49.4K | Form 4 ↗ |
Wamp Zach Paul director | Apr 1, 2026 | Award | 1,094 | $8.02 | $8.8K | 52.6K | Form 4 ↗ |
Shelton Larry director | Apr 1, 2026 | Award | 1,824 | $8.02 | $14.6K | 195.2K | Form 4 ↗ |
CENTOFANTI LOUIS F EVP of Strategic Initiatives | Nov 17, 2025 | Gift | 600 | — | — | 218.2K | Form 4 ↗ |
CENTOFANTI LOUIS F EVP of Strategic Initiatives | Nov 17, 2025 | Gift | 600 | — | — | 217.6K | Form 4 ↗ |
Grondin Richard EVP of Hanford & Int. Waste Op | Jan 20, 2026 | Tax Withhold | 1,729 | $13.71 | $23.7K | 41.3K | Form 4 ↗ |
Source: /insider-trading/search (FMP stable). Buy/Sell direction: acquisitionOrDisposition A=Buy, D=Sell. RSU vesting (M-Exempt) excluded from sentiment bar. All data from SEC EDGAR public filings.
About institutional & insider ownership
Perma-Fix Environmental Services, Inc. (PESI) is primarily owned by institutional investors, who hold approximately 40.0% of total shares outstanding. Company insiders own approximately 7.59%, while retail and public investors account for the remaining 52.44%.
The largest institutional shareholder of Perma-Fix Environmental Services, Inc. is BLACKROCK, INC., holding approximately 1.17 million shares — equal to 6.33% of outstanding shares — as of September 30, 2025.
A total of 81 institutional investors currently hold PESI stock, with a combined institutional value of approximately $75,014,965 as of the most recent 13F filing period.
Frequently asked questions
PESI ownershipPerma-Fix Environmental Services, Inc. (PESI) is primarily owned by institutional investors, who hold approximately 40.0% of shares. The largest shareholder is BLACKROCK, INC. with a 6.33% stake. Company insiders hold 7.59%. Data sourced from SEC Form 13F as of September 30, 2025.