Perma Fix Environmental Services (PESI)
Perma Fix Environmental Services on one page: short interest, daily short volume, fails to deliver, planned sales, large holders, 13F holders, earnings dates and insider trades. Listed on Nasdaq, classified by the SEC as hazardous waste management.
3.2M
Short interest
settlement 2026-09-30
8.1
Days to cover
-3.8 days vs prior
62.1%
Short share of volume
2026-10-23
961
Fails to deliver
settlement 2026-09-28
Mon 10 May
Next earnings
estimated date
$0
Insider flow, 90 days
0 buys, 0 sells
As of 2026-10-23.
Short interest
FINRA, twice a month. The newest 48 settlements in the table, 48 in the chart. JSONAs of 30 September 2026, short interest in PESI is 3,203,755 shares, up 908,340 shares over the last month. Over the last 48 readings it ranged from 950,723 shares (31 December 2024) to 3,203,755 shares (30 September 2026). The latest reading sits at the top of that range. At the reported average volume of 394K shares a day that is 8.1 days to cover.
Embed this chart.The embed keeps its attribution line.
<iframe src="https://xoomar.com/embed/stocks/pesi" width="100%" height="440" style="border:0;max-width:100%" loading="lazy" title="XOOMAR chart"></iframe>
| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 3,203,755 | +19.9% | 394,148 | 8.13 |
| 2026-09-15 | 2,673,047 | +16.4% | 223,545 | 11.96 |
| 2026-08-31 | 2,295,415 | -17.5% | 326,696 | 7.03 |
| 2026-08-14 | 2,783,230 | +32.5% | 633,874 | 4.39 |
| 2026-07-31 | 2,100,130 | -9.3% | 626,365 | 3.35 |
| 2026-07-15 | 2,315,207 | +33.3% | 408,533 | 5.67 |
| 2026-06-30 | 1,736,470 | -10.1% | 388,662 | 4.47 |
| 2026-06-15 | 1,930,478 | +29.4% | 185,440 | 10.41 |
| 2026-05-29 | 1,491,682 | -1.0% | 250,493 | 5.95 |
| 2026-05-15 | 1,506,247 | +8.4% | 330,693 | 4.55 |
| 2026-04-30 | 1,389,786 | +4.2% | 104,276 | 13.33 |
| 2026-04-15 | 1,333,669 | -9.0% | 117,013 | 11.40 |
| 2026-03-31 | 1,465,706 | +21.6% | 267,702 | 5.48 |
| 2026-03-13 | 1,204,860 | +5.5% | 107,943 | 11.16 |
| 2026-02-27 | 1,141,713 | -4.9% | 134,598 | 8.48 |
| 2026-02-13 | 1,200,709 | -8.0% | 148,911 | 8.06 |
| 2026-01-30 | 1,305,431 | -5.3% | 141,549 | 9.22 |
| 2026-01-15 | 1,378,088 | -0.7% | 82,306 | 16.74 |
| 2025-12-31 | 1,387,188 | -8.9% | 104,426 | 13.28 |
| 2025-12-15 | 1,522,357 | +0.5% | 96,602 | 15.76 |
| 2025-11-28 | 1,514,136 | +4.8% | 103,083 | 14.69 |
| 2025-11-14 | 1,445,155 | -3.9% | 272,323 | 5.31 |
| 2025-10-31 | 1,503,147 | -3.2% | 201,443 | 7.46 |
| 2025-10-15 | 1,552,495 | +2.2% | 212,408 | 7.31 |
| 2025-09-30 | 1,519,702 | +9.6% | 254,881 | 5.96 |
| 2025-09-15 | 1,386,914 | +7.5% | 447,262 | 3.10 |
| 2025-08-29 | 1,289,798 | -2.8% | 97,867 | 13.18 |
| 2025-08-15 | 1,327,196 | +2.4% | 100,960 | 13.15 |
| 2025-07-31 | 1,295,941 | +7.9% | 167,315 | 7.75 |
| 2025-07-15 | 1,201,346 | +13.1% | 105,891 | 11.35 |
| 2025-06-30 | 1,062,177 | -3.6% | 138,564 | 7.67 |
| 2025-06-13 | 1,102,219 | -6.9% | 116,142 | 9.49 |
| 2025-05-30 | 1,184,283 | +5.7% | 139,396 | 8.50 |
| 2025-05-15 | 1,120,801 | +6.7% | 239,319 | 4.68 |
| 2025-04-30 | 1,050,786 | -4.0% | 141,078 | 7.45 |
| 2025-04-15 | 1,094,344 | +3.3% | 214,065 | 5.11 |
| 2025-03-31 | 1,059,325 | +4.2% | 229,937 | 4.61 |
| 2025-03-14 | 1,016,930 | -7.4% | 132,770 | 7.66 |
| 2025-02-28 | 1,097,987 | +12.6% | 140,638 | 7.81 |
| 2025-02-14 | 975,515 | -0.0% | 99,870 | 9.77 |
| 2025-01-31 | 975,663 | -8.7% | 114,154 | 8.55 |
| 2025-01-15 | 1,068,664 | +12.4% | 89,836 | 11.90 |
| 2024-12-31 | 950,723 | -11.2% | 176,290 | 5.39 |
| 2024-12-13 | 1,070,483 | +2.3% | 130,333 | 8.21 |
| 2024-11-29 | 1,046,648 | +0.9% | 195,759 | 5.35 |
| 2024-11-15 | 1,037,008 | -3.2% | 167,206 | 6.20 |
| 2024-10-31 | 1,070,991 | -10.4% | 96,421 | 11.11 |
| 2024-10-15 | 1,195,283 | +1.2% | 69,151 | 17.29 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of PESI volume is 62.1%, up 10.0 points over the last five sessions. Over the last 30 readings it ranged from 36.3% (14 September 2026) to 80.8% (18 September 2026). The latest reading is 4.1 points above the 30-session average of 57.9%, on 81K shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 50K | 81K | 62.1% | 0 |
| 2026-10-22 | 37K | 84K | 43.5% | 0 |
| 2026-10-21 | 63K | 100K | 63.2% | 0 |
| 2026-10-20 | 90K | 188K | 48.2% | 0 |
| 2026-10-19 | 78K | 153K | 50.7% | 0 |
| 2026-10-16 | 75K | 144K | 52.1% | 0 |
| 2026-10-15 | 85K | 152K | 55.9% | 0 |
| 2026-10-14 | 228K | 349K | 65.2% | 0 |
| 2026-10-13 | 71K | 142K | 50.3% | 0 |
| 2026-10-12 | 49K | 98K | 50.1% | 0 |
| 2026-10-09 | 90K | 159K | 56.7% | 0 |
| 2026-10-08 | 77K | 124K | 62.4% | 0 |
| 2026-10-07 | 60K | 99K | 60.4% | 0 |
| 2026-10-06 | 46K | 80K | 57.6% | 0 |
| 2026-10-05 | 42K | 65K | 65.2% | 0 |
| 2026-10-02 | 53K | 94K | 56.4% | 0 |
| 2026-10-01 | 88K | 156K | 56.3% | 0 |
| 2026-09-30 | 54K | 81K | 67.4% | 0 |
| 2026-09-29 | 121K | 167K | 72.6% | 5,798 |
| 2026-09-28 | 34K | 57K | 58.9% | 0 |
| 2026-09-25 | 82K | 121K | 67.9% | 897 |
| 2026-09-24 | 87K | 193K | 45.1% | 3 |
| 2026-09-23 | 109K | 253K | 43.1% | 16,901 |
| 2026-09-22 | 100K | 250K | 39.8% | 5,923 |
| 2026-09-21 | 53K | 72K | 73.2% | 0 |
| 2026-09-18 | 63K | 78K | 80.8% | 0 |
| 2026-09-17 | 64K | 88K | 72.9% | 0 |
| 2026-09-16 | 79K | 127K | 62.6% | 0 |
| 2026-09-15 | 68K | 111K | 61.3% | 0 |
| 2026-09-14 | 66K | 182K | 36.3% | 0 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 28 September 2026, the fails-to-deliver balance in PESI is 961 shares, up 300 shares over the last settlement date. Over the last 30 readings it ranged from 174 shares (28 July 2026) to 17,652 shares (11 September 2026). The latest reading sits at the bottom of that range.
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-28 | 961 | $15.65 | $15K |
| 2026-09-24 | 661 | $15.79 | $10K |
| 2026-09-23 | 16,454 | $16.53 | $272K |
| 2026-09-22 | 6,803 | $17.34 | $118K |
| 2026-09-21 | 7,540 | $17.45 | $132K |
| 2026-09-17 | 5,652 | $18.20 | $103K |
| 2026-09-16 | 6,519 | $18.34 | $120K |
| 2026-09-15 | 187 | $18.28 | $3K |
| 2026-09-11 | 17,652 | $18.25 | $322K |
| 2026-09-10 | 232 | $18.59 | $4K |
| 2026-09-09 | 3,487 | $18.97 | $66K |
| 2026-09-02 | 3,422 | $17.84 | $61K |
| 2026-09-01 | 1,414 | $18.15 | $26K |
| 2026-08-28 | 2,774 | $19.30 | $54K |
| 2026-08-18 | 4,316 | $17.63 | $76K |
| 2026-08-14 | 9,949 | $17.96 | $179K |
| 2026-08-13 | 1,200 | $19.43 | $23K |
| 2026-08-03 | 1,024 | $16.60 | $17K |
| 2026-07-31 | 7,438 | $16.83 | $125K |
| 2026-07-30 | 7,022 | $15.87 | $111K |
| 2026-07-28 | 174 | $15.68 | $3K |
| 2026-07-27 | 2,859 | $15.98 | $46K |
| 2026-07-24 | 663 | $16.16 | $11K |
| 2026-07-23 | 618 | $16.70 | $10K |
| 2026-07-16 | 2,901 | $14.83 | $43K |
| 2026-07-14 | 3,534 | $14.25 | $50K |
| 2026-07-13 | 1,496 | $13.87 | $21K |
| 2026-07-10 | 297 | $14.29 | $4K |
| 2026-07-08 | 4,103 | $14.34 | $59K |
| 2026-07-07 | 245 | $14.06 | $3K |
Insider trades
SEC Form 4, newest first. JSONNo open-market insider trades were reported for PESI in the last 90 days. The most recent filings are listed below. Latest filing: ZWECKER MARK A (Director) on 2026-10-01.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-01 | ZWECKER MARK A | Director | Grant | 1K | $11.74 | $12K | 249K |
| 2026-10-01 | Duggan Kerry C | Director | Grant | 748 | $11.74 | $9K | 8K |
| 2026-10-01 | Bostick Thomas | Director | Grant | 1K | $11.74 | $13K | 52K |
| 2026-10-01 | Grumski Joseph Timothy | Director | Grant | 1K | $11.74 | $17K | 69K |
| 2026-10-01 | Shelton Larry | Director | Grant | 1K | $11.74 | $15K | 200K |
| 2026-10-01 | REEDER JOE | Director | Grant | 1K | $11.74 | $15K | 241K |
| 2026-10-01 | Wamp Zach Paul | Director | Grant | 775 | $11.74 | $9K | 54K |
| 2026-07-13 | Shelton Larry | Director | Exercise or conversion | 2K | $4.60 | $11K | 199K |
| 2026-07-01 | ZWECKER MARK A | Director | Grant | 1K | $10.72 | $13K | 248K |
| 2026-07-01 | REEDER JOE | Director | Grant | 1K | $10.72 | $16K | 239K |
| 2026-07-01 | Wamp Zach Paul | Director | Grant | 849 | $10.72 | $9K | 53K |
| 2026-07-01 | Shelton Larry | Director | Grant | 1K | $10.72 | $15K | 197K |
| 2026-07-01 | Grumski Joseph Timothy | Director | Grant | 2K | $10.72 | $16K | 68K |
| 2026-07-01 | Duggan Kerry C | Director | Grant | 819 | $10.72 | $9K | 8K |
| 2026-07-01 | Bostick Thomas | Director | Grant | 1K | $10.72 | $13K | 51K |
| 2026-04-01 | ZWECKER MARK A | Director | Grant | 2K | $8.02 | $12K | 244K |
| 2026-04-01 | REEDER JOE | Director | Grant | 2K | $8.02 | $15K | 238K |
| 2026-04-01 | Wamp Zach Paul | Director | Grant | 1K | $8.02 | $9K | 53K |
| 2026-04-01 | Shelton Larry | Director | Grant | 2K | $8.02 | $15K | 195K |
| 2026-04-01 | Grumski Joseph Timothy | Director | Grant | 2K | $8.02 | $17K | 66K |
| 2026-04-01 | Duggan Kerry C | Director | Grant | 1K | $8.02 | $8K | 7K |
| 2026-04-01 | Bostick Thomas | Director | Grant | 2K | $8.02 | $12K | 49K |
| 2026-01-20 | Grondin Richard | EVP of Hanford & Int. Waste Op | Tax withholding | 2K | $13.71 | $24K | 41K |
| 2026-01-20 | Grondin Richard | EVP of Hanford & Int. Waste Op | Exercise or conversion | 6K | $3.95 | $24K | 43K |
| 2026-01-20 | Grondin Richard | EVP of Hanford & Int. Waste Op | Tax withholding | 3K | $13.71 | $35K | 37K |
| 2026-01-20 | Grondin Richard | EVP of Hanford & Int. Waste Op | Exercise or conversion | 5K | $7.00 | $35K | 40K |
| 2026-01-02 | Wamp Zach Paul | Director | Grant | 964 | $9.44 | $9K | 52K |
| 2026-01-02 | Shelton Larry | Director | Grant | 2K | $9.44 | $15K | 193K |
| 2026-01-02 | ZWECKER MARK A | Director | Grant | 1K | $9.44 | $13K | 243K |
| 2026-01-02 | Grumski Joseph Timothy | Director | Grant | 2K | $9.44 | $17K | 64K |
| 2026-01-02 | Duggan Kerry C | Director | Grant | 929 | $9.44 | $9K | 6K |
| 2026-01-02 | Bostick Thomas | Director | Grant | 1K | $9.44 | $13K | 48K |
| 2026-01-02 | REEDER JOE | Director | Grant | 2K | $9.44 | $15K | 236K |
| 2025-12-15 | REEDER JOE | Director | Gift | 727 | $0.00 | $0 | 235K |
| 2025-12-15 | REEDER JOE | Director | Gift | 364 | $0.00 | $0 | 234K |
| 2025-12-15 | REEDER JOE | Director | Gift | 727 | $0.00 | $0 | 236K |
| 2025-12-15 | REEDER JOE | Director | Gift | 1K | $0.00 | $0 | 236K |
| 2025-12-15 | REEDER JOE | Director | Gift | 11K | $0.00 | $0 | 237K |
| 2025-11-17 | CENTOFANTI LOUIS F | EVP of Strategic Initiatives | Gift | 600 | $0.00 | $0 | 218K |
| 2025-11-17 | CENTOFANTI LOUIS F | EVP of Strategic Initiatives | Gift | 600 | $0.00 | $0 | 218K |
| 2025-10-01 | ZWECKER MARK A | Director | Grant | 2K | $7.58 | $12K | 241K |
| 2025-10-01 | Wamp Zach Paul | Director | Grant | 1K | $7.58 | $9K | 51K |
| 2025-10-01 | Shelton Larry | Director | Grant | 2K | $7.58 | $15K | 192K |
| 2025-10-01 | REEDER JOE | Director | Grant | 2K | $7.58 | $16K | 248K |
| 2025-10-01 | Grumski Joseph Timothy | Director | Grant | 2K | $7.58 | $17K | 62K |
| 2025-10-01 | Duggan Kerry C | Director | Grant | 1K | $7.58 | $9K | 5K |
| 2025-10-01 | Bostick Thomas | Director | Grant | 2K | $7.58 | $13K | 47K |
| 2025-09-16 | Duggan Kerry C | Director | Sell | 6K | $8.60 | $49K | 4K |
| 2025-09-11 | Shelton Larry | Director | Buy | 1K | $8.58 | $9K | 190K |
| 2025-09-11 | Duff Mark | President and CEO | Buy | 897 | $8.05 | $7K | 135K |
| 2025-09-09 | Shelton Larry | Director | Buy | 1K | $9.61 | $10K | 189K |
| 2025-09-02 | Shelton Larry | Director | Exercise or conversion | 2K | $4.19 | $10K | 188K |
| 2025-08-28 | ZWECKER MARK A | Director | Exercise or conversion | 2K | $4.19 | $10K | 240K |
| 2025-07-14 | Grondin Richard | EVP of Hanford & Int. Waste Op | Tax withholding | 2K | $11.32 | $24K | 35K |
| 2025-07-14 | Grondin Richard | EVP of Hanford & Int. Waste Op | Exercise or conversion | 6K | $3.95 | $24K | 37K |
| 2025-07-14 | Grondin Richard | EVP of Hanford & Int. Waste Op | Tax withholding | 3K | $11.32 | $35K | 31K |
| 2025-07-14 | Grondin Richard | EVP of Hanford & Int. Waste Op | Exercise or conversion | 5K | $7.00 | $35K | 34K |
| 2025-07-01 | ZWECKER MARK A | Director | Grant | 2K | $7.89 | $13K | 237K |
| 2025-07-01 | Wamp Zach Paul | Director | Grant | 1K | $7.89 | $9K | 49K |
| 2025-07-01 | Shelton Larry | Director | Grant | 2K | $7.89 | $15K | 185K |
| 2025-07-01 | REEDER JOE | Director | Grant | 2K | $7.89 | $16K | 246K |
| 2025-07-01 | Grumski Joseph Timothy | Director | Grant | 2K | $7.89 | $17K | 60K |
| 2025-07-01 | Duggan Kerry C | Director | Grant | 1K | $7.89 | $9K | 9K |
| 2025-07-01 | Bostick Thomas | Director | Grant | 2K | $7.89 | $12K | 45K |
| 2025-05-30 | Duggan Kerry C | Director | Sell | 17K | $10.92 | $182K | 8K |
| 2025-04-01 | ZWECKER MARK A | Director | Grant | 2K | $5.45 | $12K | 236K |
| 2025-04-01 | Shelton Larry | Director | Grant | 3K | $5.45 | $14K | 184K |
| 2025-04-01 | Duggan Kerry C | Director | Grant | 2K | $5.45 | $8K | 25K |
| 2025-04-01 | Wamp Zach Paul | Director | Grant | 2K | $5.45 | $9K | 48K |
| 2025-04-01 | REEDER JOE | Director | Grant | 3K | $5.45 | $15K | 244K |
| 2025-04-01 | Bostick Thomas | Director | Grant | 2K | $5.45 | $12K | 43K |
| 2025-04-01 | Grumski Joseph Timothy | Director | Grant | 3K | $5.45 | $17K | 58K |
| 2025-03-21 | Duff Mark | President and CEO | Buy | 650 | $7.05 | $5K | 134K |
| 2025-03-21 | Duff Mark | President and CEO | Buy | 750 | $7.02 | $5K | 132K |
| 2025-03-21 | Duff Mark | President and CEO | Buy | 650 | $7.03 | $5K | 133K |
| 2025-03-21 | Shelton Larry | Director | Grant | 2K | $7.07 | $14K | 181K |
| 2025-03-21 | Naccarato Ben | Chief Financial Officer | Buy | 400 | $7.00 | $3K | 49K |
| 2025-03-18 | Duff Mark | President and CEO | Buy | 500 | $7.20 | $4K | 132K |
| 2025-03-18 | Duff Mark | President and CEO | Buy | 500 | $7.10 | $4K | 131K |
| 2025-03-18 | Eshleman Troy | Chief Operating Officer | Buy | 1K | $7.35 | $10K | 1K |
| 2025-03-17 | CENTOFANTI LOUIS F | EVP of Strategic Initiatives | Buy | 1K | $7.31 | $7K | 219K |
| 2025-01-08 | Duff Mark | President and CEO | Tax withholding | 7K | $10.58 | $79K | 131K |
| 2025-01-08 | Duff Mark | President and CEO | Exercise or conversion | 25K | $3.15 | $79K | 138K |
| 2025-01-08 | Naccarato Ben | Chief Financial Officer | Tax withholding | 4K | $10.58 | $47K | 48K |
| 2025-01-08 | Naccarato Ben | Chief Financial Officer | Exercise or conversion | 15K | $3.15 | $47K | 53K |
| 2025-01-02 | Duggan Kerry C | Director | Grant | 1K | $8.30 | $8K | 23K |
| 2025-01-02 | Grumski Joseph Timothy | Director | Grant | 2K | $8.30 | $16K | 55K |
| 2025-01-02 | Bostick Thomas | Director | Grant | 2K | $8.30 | $12K | 41K |
| 2025-01-02 | Shelton Larry | Director | Grant | 2K | $8.30 | $14K | 179K |
| 2025-01-02 | ZWECKER MARK A | Director | Grant | 1K | $8.30 | $12K | 233K |
| 2025-01-02 | Wamp Zach Paul | Director | Grant | 1K | $8.30 | $9K | 47K |
| 2025-01-02 | REEDER JOE | Director | Grant | 2K | $8.30 | $15K | 242K |
| 2024-11-18 | Grumski Joseph Timothy | Director | Gift | 2K | price not stated in the filing | not stated | 53K |
| 2024-11-14 | CENTOFANTI LOUIS F | EVP of Strategic Initiatives | Exercise or conversion | 15K | $3.15 | $47K | 221K |
| 2024-11-14 | CENTOFANTI LOUIS F | EVP of Strategic Initiatives | Tax withholding | 3K | $13.72 | $47K | 218K |
| 2024-10-01 | Shelton Larry | Director | Grant | 2K | $9.20 | $15K | 177K |
| 2024-10-01 | ZWECKER MARK A | Director | Grant | 1K | $9.20 | $12K | 232K |
| 2024-10-01 | Grumski Joseph Timothy | Director | Grant | 2K | $9.20 | $17K | 55K |
| 2024-10-01 | Bostick Thomas | Director | Grant | 1K | $9.20 | $13K | 39K |
| 2024-10-01 | REEDER JOE | Director | Grant | 2K | $9.20 | $16K | 240K |
Form 4 filings are due within two business days of the trade. Insiders sell for many reasons that say nothing about the company; open-market buys are rarer.
Planned sales (Form 144)
Newest first. JSON1 Form 144 notice on file for PESI worth $52K at the prices reported; 0 in the last 90 days worth $0. Latest: Duggan Kerry C filed on 2025-09-15 to sell 5,653 shares ($52K) from 2025-09-16.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2025-09-15 | Duggan Kerry CDirector | 6K | $52K | 0.031% | 2025-09-16 | Northwestern Mutual Investment Services, LLC |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON1 holder reports 5% or more of PESI in its latest filing, on Schedule 13G (passive). The holder is HOLD Alapkezelo Zrt. at 10.6% of the class (2,249,986 shares), filed 2026-08-27 for an event on 2026-08-25.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-08-28 | 13G/Ano. 2 | MAK CAPITAL ONE LLCinvestment adviser | 1.0M | 4.8% | 2026-08-24 |
| 2026-08-28 | 13G/Ano. 2 | MAK Capital Fund LPpartnership | 1.0M | 4.8% | 2026-08-24 |
| 2026-08-28 | 13G/Ano. 2 | Kaufman Michael Aindividual | 1.0M | 4.8% | 2026-08-24 |
| 2026-08-27 | 13G/Ano. 1 | HOLD Alapkezelo Zrt.other entity | 2.2M | 10.6% | 2026-08-25 |
| 2026-03-27 | 13G/Ano. 1 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
13F holders
Tracked managers holding PESI at their latest 13F. JSON2 of the 30 tracked managers held PESI at their latest 13F, $2.5M in total at quarter-end prices. Citadel Advisors is the largest at $2.2M (0.0% of its portfolio) as of 2026-06-30. Over the prior quarter 1 added shares and 1 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 153K | $2.2M | 0.00% | +83K |
| D. E. Shaw & Co. | 2026-06-30 | 25K | $355K | 0.00% | -38K |
Only the 30 tracked managers on the funds hub; a 13F reports long positions in US listed stock at quarter end, 45 days late, and says nothing about shorts or positions sold since.
What this page is
Perma Fix Environmental Services in the regulatory record
Regulators publish company data in separate files that never sit next to each other: FINRA's twice-monthly short interest, its daily short sale volume, the SEC's fails-to-deliver counts, and each insider's Form 4. A company page puts those series for one ticker on one URL, with planned sales, large holders, 13F holders and financials beside them, so the short position, the daily flow, the settlement fails and what insiders are doing can be read together.
Each section has its own history table, a one-line summary of the latest figures and its own JSON and CSV links, and says when its source last updated.
This page follows Perma Fix Environmental Services (PESI), SEC CIK 891532, listed on Nasdaq, classified by the SEC as hazardous waste management. The cross-market tables live on the short interest and insider transactions hubs.
Source and updates
- Short interest
- FINRA consolidated short interestSource: FINRA.Twice a month, about eight business days after settlement. Latest 2026-09-30.JSON and CSV
- Daily short volume
- FINRA Reg SHO daily filesSource: FINRA.Every trading day, the morning after FINRA posts it. Latest 2026-10-23.JSON and CSV
- Fails to deliver
- SEC fails-to-deliver dataSource: SEC.Twice a month, a few weeks after the half month ends. Latest 2026-09-28.JSON and CSV
- Planned sales
- SEC EDGAR Form 144Source: SEC.New notices appear shortly after the SEC posts them; a notice is filed on or before the sale. Latest 2025-09-15.JSON and CSV
- Large holders
- SEC EDGAR Schedule 13D and 13GSource: SEC.New filings appear shortly after the SEC posts them. A 13D is due within five business days of crossing 5%; a 13G follows the passive schedule. Latest 2026-08-28.JSON and CSV
- 13F holders
- SEC EDGAR Form 13F-HRSource: SEC.Quarterly, filed within 45 days of quarter end; 30 tracked managers. Latest 2026-06-30.JSON and CSV
- Earnings dates
- SEC EDGAR 8-K filings (Item 2.02)Source: SEC.Twice a day. Reported dates come from the company's 8-K filings; the next date is marked as an estimate until the 8-K arrives. Latest 2026-07-28.JSON and CSV
- Insider trades
- SEC EDGAR Form 4Source: SEC.New filings appear shortly after the SEC posts them; they're due two business days after the trade. Latest 2026-10-01.JSON and CSV
- Company record
- EDGAR filing index for CIK 891532Ticker, name and exchange from the SEC's company list, refreshed weekly.
- Rate limits
- 10 requests a minute without a key, 30 with a free key from a free account.
How to read it
- Read the position against the flow: rising short interest with a high daily short share is new shorting; rising short interest with a normal short share is old shorts holding on.
- Insider buys next to a large short position are rare and stand out; insider sells next to one are common and mean little.
- Fails to deliver matter relative to the float, not in absolute shares; a million failed shares in a mega cap is noise.
Analysis of what the data shows, not advice. XOOMAR does not recommend buying, selling or holding anything.
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Datasets
Frequently Asked Questions
How much of PESI is sold short?
3,203,755 shares were held short at the 2026-09-30 settlement, 8.1 days of average volume. FINRA publishes the next count about eight business days after the 15th and the last business day of the month.
What is PESI's daily short volume?
On 2026-10-23, 50,048 of the 80,609 PESI shares reported to FINRA were sold short, 62.1% of the day's reported volume. Short volume is a flow for one day, not a position.
Does PESI have fails to deliver?
The SEC's latest file shows 961 PESI shares failed to deliver at settlement 2026-09-28. Fails are reported per settlement date and published twice a month with a lag.
Are PESI insiders buying or selling?
No open-market insider trades were reported for PESI in the last 90 days. The most recent filings are listed below. Latest filing: ZWECKER MARK A (Director) on 2026-10-01.
Have PESI insiders filed to sell?
1 Form 144 notice on file for PESI worth $52K at the prices reported; 0 in the last 90 days worth $0. Latest: Duggan Kerry C filed on 2025-09-15 to sell 5,653 shares ($52K) from 2025-09-16.
Who owns 5% or more of PESI?
1 holder reports 5% or more of PESI in its latest filing, on Schedule 13G (passive). The holder is HOLD Alapkezelo Zrt. at 10.6% of the class (2,249,986 shares), filed 2026-08-27 for an event on 2026-08-25.
Which tracked 13F managers own PESI?
2 of the 30 tracked 13F managers held PESI shares at their latest filing, $2.5M in all. The largest: Ken Griffin's Citadel Advisors (153K shares, $2.2M), D. E. Shaw & Co. (25K shares, $355K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.