ASP Isotopes (ASPI)
ASP Isotopes 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 miscellaneous chemical products.
26.5M
Short interest
settlement 2026-09-30
5.3
Days to cover
-1.2 days vs prior
59.4%
Short share of volume
2026-10-23
221,832
Fails to deliver
settlement 2026-09-30
Tue 3 Aug
Next earnings
estimated date
-$1.3M
Insider flow, 90 days
2 buys, 8 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 ASPI is 26,455,716 shares, up 974,181 shares over the last month. Over the last 48 readings it ranged from 5,573,898 shares (15 November 2024) to 26,784,809 shares (14 August 2026). The latest reading sits at the top of that range. At the reported average volume of 5.0M shares a day that is 5.3 days to cover.
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| Settlement | Shares short | Change | Avg daily volume | Days to cover |
|---|---|---|---|---|
| 2026-09-30 | 26,455,716 | +1.5% | 4,984,468 | 5.31 |
| 2026-09-15 | 26,069,790 | +2.3% | 3,998,317 | 6.52 |
| 2026-08-31 | 25,481,535 | -4.9% | 3,177,156 | 8.02 |
| 2026-08-14 | 26,784,809 | +0.6% | 3,076,061 | 8.71 |
| 2026-07-31 | 26,638,593 | +9.9% | 4,362,864 | 6.11 |
| 2026-07-15 | 24,237,238 | +2.0% | 3,547,026 | 6.83 |
| 2026-06-30 | 23,756,842 | +2.9% | 4,952,012 | 4.80 |
| 2026-06-15 | 23,093,270 | +2.3% | 5,766,234 | 4.00 |
| 2026-05-29 | 22,580,613 | -2.2% | 6,979,403 | 3.24 |
| 2026-05-15 | 23,082,673 | -7.5% | 4,212,215 | 5.48 |
| 2026-04-30 | 24,948,729 | -1.5% | 3,780,221 | 6.60 |
| 2026-04-15 | 25,332,791 | -0.5% | 4,313,938 | 5.87 |
| 2026-03-31 | 25,469,515 | +13.5% | 5,224,692 | 4.87 |
| 2026-03-13 | 22,437,204 | -7.8% | 5,601,491 | 4.01 |
| 2026-02-27 | 24,326,781 | +7.4% | 2,819,566 | 8.63 |
| 2026-02-13 | 22,658,515 | +10.1% | 4,781,569 | 4.74 |
| 2026-01-30 | 20,587,124 | -3.0% | 6,875,352 | 2.99 |
| 2026-01-15 | 21,212,899 | +2.7% | 6,449,744 | 3.29 |
| 2025-12-31 | 20,658,615 | +1.3% | 5,131,253 | 4.03 |
| 2025-12-15 | 20,400,115 | +8.5% | 5,552,176 | 3.67 |
| 2025-11-28 | 18,807,461 | +0.7% | 7,136,773 | 2.64 |
| 2025-11-14 | 18,685,049 | +6.5% | 6,909,045 | 2.70 |
| 2025-10-31 | 17,543,519 | +10.9% | 8,962,575 | 1.96 |
| 2025-10-15 | 15,818,701 | -1.6% | 11,602,248 | 1.36 |
| 2025-09-30 | 16,080,150 | -2.3% | 6,216,181 | 2.59 |
| 2025-09-15 | 16,456,056 | +6.5% | 4,224,150 | 3.90 |
| 2025-08-29 | 15,452,460 | +8.7% | 4,768,720 | 3.24 |
| 2025-08-15 | 14,219,587 | +8.0% | 4,178,955 | 3.40 |
| 2025-07-31 | 13,168,795 | -19.4% | 5,907,867 | 2.23 |
| 2025-07-15 | 16,337,928 | +6.8% | 3,174,329 | 5.15 |
| 2025-06-30 | 15,291,713 | +3.9% | 3,753,894 | 4.07 |
| 2025-06-13 | 14,717,499 | +3.8% | 4,389,496 | 3.35 |
| 2025-05-30 | 14,173,425 | -13.9% | 6,117,311 | 2.32 |
| 2025-05-15 | 16,459,891 | +3.2% | 1,715,810 | 9.59 |
| 2025-04-30 | 15,944,918 | -2.2% | 1,597,864 | 9.98 |
| 2025-04-15 | 16,303,310 | -2.5% | 2,567,203 | 6.35 |
| 2025-03-31 | 16,717,757 | +2.8% | 1,365,713 | 12.24 |
| 2025-03-14 | 16,261,895 | +2.2% | 1,356,379 | 11.99 |
| 2025-02-28 | 15,916,172 | -0.3% | 1,922,774 | 8.28 |
| 2025-02-14 | 15,963,087 | +4.3% | 2,047,843 | 7.80 |
| 2025-01-31 | 15,298,452 | +104.2% | 2,581,340 | 5.93 |
| 2025-01-15 | 7,492,461 | +10.6% | 1,932,676 | 3.88 |
| 2024-12-31 | 6,774,769 | +13.8% | 2,474,602 | 2.74 |
| 2024-12-13 | 5,954,519 | -7.7% | 3,588,014 | 1.66 |
| 2024-11-29 | 6,449,025 | +15.7% | 8,463,367 | 1.00 |
| 2024-11-15 | 5,573,898 | -48.4% | 6,957,070 | 1.00 |
| 2024-10-31 | 10,804,893 | +8.8% | 7,992,748 | 1.35 |
| 2024-10-15 | 9,926,482 | +3.7% | 823,750 | 12.05 |
Daily short volume
FINRA Reg SHO, the last 30 sessions. JSONAs of 23 October 2026, the short share of ASPI volume is 59.4%, down 12.4 points over the last five sessions. Over the last 30 readings it ranged from 24.6% (30 September 2026) to 75.0% (19 October 2026). The latest reading is 9.2 points above the 30-session average of 50.2%, on 1.3M shares reported.
| Date | Short volume | Total volume | Short share | Exempt |
|---|---|---|---|---|
| 2026-10-23 | 746K | 1.3M | 59.4% | 0 |
| 2026-10-22 | 789K | 1.5M | 54.3% | 700 |
| 2026-10-21 | 516K | 940K | 54.9% | 920 |
| 2026-10-20 | 1.1M | 1.7M | 61.1% | 80,712 |
| 2026-10-19 | 2.8M | 3.7M | 75.0% | 108,895 |
| 2026-10-16 | 1.2M | 1.7M | 71.8% | 0 |
| 2026-10-15 | 2.2M | 3.3M | 66.5% | 102,040 |
| 2026-10-14 | 1.1M | 2.3M | 48.9% | 16,634 |
| 2026-10-13 | 984K | 2.9M | 34.4% | 0 |
| 2026-10-12 | 1.1M | 3.0M | 35.2% | 200 |
| 2026-10-09 | 997K | 1.8M | 55.0% | 186 |
| 2026-10-08 | 1.0M | 1.9M | 53.7% | 5,883 |
| 2026-10-07 | 1.1M | 2.1M | 51.8% | 600 |
| 2026-10-06 | 628K | 2.4M | 26.2% | 233 |
| 2026-10-05 | 1.5M | 2.9M | 53.1% | 0 |
| 2026-10-02 | 821K | 1.9M | 42.6% | 573 |
| 2026-10-01 | 2.2M | 3.0M | 72.7% | 1,126 |
| 2026-09-30 | 671K | 2.7M | 24.6% | 2,880 |
| 2026-09-29 | 1.1M | 2.5M | 42.6% | 114,117 |
| 2026-09-28 | 2.3M | 5.0M | 45.9% | 50,142 |
| 2026-09-25 | 499K | 1.6M | 31.4% | 427 |
| 2026-09-24 | 957K | 1.8M | 51.8% | 0 |
| 2026-09-23 | 537K | 1.0M | 51.6% | 400 |
| 2026-09-22 | 522K | 1.0M | 49.9% | 40 |
| 2026-09-21 | 592K | 1.3M | 45.2% | 16 |
| 2026-09-18 | 877K | 1.6M | 55.7% | 3,323 |
| 2026-09-17 | 545K | 1.2M | 43.8% | 2,960 |
| 2026-09-16 | 781K | 1.3M | 61.7% | 0 |
| 2026-09-15 | 925K | 2.1M | 43.8% | 920 |
| 2026-09-14 | 812K | 1.9M | 42.2% | 465 |
Fails to deliver
SEC, the last 30 settlement dates with a fail. JSONAs of 30 September 2026, the fails-to-deliver balance in ASPI is 221,832 shares, down 24,106 shares over the last settlement date. Over the last 30 readings it ranged from 14 shares (31 August 2026) to 407,328 shares (27 August 2026).
| Settlement | Shares failed | Price | Value |
|---|---|---|---|
| 2026-09-30 | 221,832 | $2.64 | $586K |
| 2026-09-29 | 245,938 | $2.60 | $639K |
| 2026-09-24 | 7,918 | $3.01 | $24K |
| 2026-09-23 | 5,354 | $3.18 | $17K |
| 2026-09-22 | 70,433 | $3.18 | $224K |
| 2026-09-17 | 71,473 | $3.15 | $225K |
| 2026-09-15 | 928 | $3.19 | $3K |
| 2026-09-14 | 814 | $3.31 | $3K |
| 2026-09-11 | 51,186 | $3.59 | $184K |
| 2026-09-10 | 299,598 | $3.82 | $1.1M |
| 2026-09-09 | 17,646 | $4.22 | $74K |
| 2026-09-08 | 4,071 | $4.20 | $17K |
| 2026-09-03 | 30,922 | $3.93 | $122K |
| 2026-09-01 | 60,643 | $4.02 | $244K |
| 2026-08-31 | 14 | $3.88 | $54 |
| 2026-08-28 | 276,242 | $4.04 | $1.1M |
| 2026-08-27 | 407,328 | $3.95 | $1.6M |
| 2026-08-26 | 28,017 | $4.00 | $112K |
| 2026-08-25 | 53,479 | $3.89 | $208K |
| 2026-08-24 | 118,038 | $4.00 | $472K |
| 2026-08-21 | 15,533 | $3.95 | $61K |
| 2026-08-19 | 373 | $3.86 | $1K |
| 2026-08-12 | 632 | $4.32 | $3K |
| 2026-08-11 | 600 | $4.29 | $3K |
| 2026-08-06 | 59,684 | $4.05 | $242K |
| 2026-08-05 | 97,348 | $4.29 | $418K |
| 2026-08-03 | 5,374 | $4.00 | $21K |
| 2026-07-31 | 2,500 | $3.98 | $10K |
| 2026-07-30 | 94,811 | $3.54 | $336K |
| 2026-07-29 | 278,577 | $3.78 | $1.1M |
Insider trades
SEC Form 4, newest first. JSONOver the last 90 days ASPI insiders reported 2 open-market buys ($62K) against 8 sells ($1.3M), so the dollar flow leans toward selling. Latest filing: Kiessling Heather (Chief Financial Officer) on 2026-10-16.
| Date | Insider | Title | Type | Shares | Price | Value | Owned after |
|---|---|---|---|---|---|---|---|
| 2026-10-16 | Kiessling Heather | Chief Financial Officer | Sell | 22K | $2.19 | $48K | 1.5M |
| 2026-10-14 | Ainscow Robert | COO | Sell | 23K | $2.11 | $48K | 2.2M |
| 2026-09-30 | Ryan Robert John Andrew | Director | Buy | 15K | $2.68 | $40K | 675K |
| 2026-09-28 | Ryan Robert John Andrew | Director | Buy | 8K | $2.70 | $22K | 660K |
| 2026-09-08 | Ainscow Robert | COO | Sell | 8K | $4.29 | $36K | 2.2M |
| 2026-09-04 | Mann Paul Elliot | Chairman and CEO | Sell | 84K | $4.10 | $343K | 9.3M |
| 2026-09-03 | Mann Paul Elliot | Chairman and CEO | Sell | 84K | $3.92 | $328K | 9.4M |
| 2026-09-02 | Mann Paul Elliot | Chairman and CEO | Sell | 84K | $3.91 | $327K | 9.5M |
| 2026-09-02 | Ainscow Robert | COO | Sell | 25K | $3.90 | $98K | 2.3M |
| 2026-09-02 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Sell | 24K | $3.89 | $92K | 776K |
| 2026-07-01 | Kiessling Heather | Chief Financial Officer | Sell | 23K | $6.28 | $145K | 1.5M |
| 2026-06-30 | Wider Todd | Director | Sell | 50K | $6.12 | $306K | 672K |
| 2026-06-30 | Gorley Michael | Director | Sell | 30K | $6.27 | $188K | 88K |
| 2026-06-30 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Sell | 100K | $6.14 | $614K | 800K |
| 2026-06-29 | Wider Todd | Director | Sell | 50K | $6.25 | $313K | 722K |
| 2026-06-08 | Ainscow Robert | COO | Sell | 8K | $7.00 | $59K | 2.3M |
| 2026-06-03 | Mann Paul Elliot | Chairman and CEO | Sell | 84K | $7.76 | $650K | 9.6M |
| 2026-06-02 | Mann Paul Elliot | Chairman and CEO | Sell | 84K | $8.29 | $694K | 9.7M |
| 2026-06-01 | Mann Paul Elliot | Chairman and CEO | Sell | 84K | $7.88 | $660K | 9.7M |
| 2026-05-28 | Kiessling Heather | Chief Financial Officer | Grant | 840K | price not stated in the filing | not stated | 1.5M |
| 2026-05-28 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Grant | 400K | price not stated in the filing | not stated | 900K |
| 2026-05-28 | Ainscow Robert | Chief Operating Officer | Grant | 800K | price not stated in the filing | not stated | 2.3M |
| 2026-05-28 | Mann Paul Elliot | Chairman and CEO | Grant | 2.2M | price not stated in the filing | not stated | 9.8M |
| 2026-04-16 | Moore Duncan | Director | Sell | 12K | $5.21 | $61K | 1.0M |
| 2026-04-16 | Ainscow Robert | COO | Sell | 23K | $5.21 | $117K | 1.5M |
| 2026-04-15 | Kiessling Heather | Chief Financial Officer | Sell | 23K | $5.48 | $127K | 709K |
| 2026-03-06 | Ainscow Robert | COO | Sell | 25K | $4.51 | $113K | 1.5M |
| 2026-03-06 | Ainscow Robert | COO | Sell | 8K | $5.44 | $46K | 1.5M |
| 2026-03-02 | Mann Paul Elliot | Executive Chairman | Sell | 162K | $5.44 | $882K | 7.6M |
| 2025-12-18 | Moore Duncan | Director | Grant | 37K | price not stated in the filing | not stated | 1.1M |
| 2025-12-18 | Gorley Michael | Director | Grant | 37K | price not stated in the filing | not stated | 118K |
| 2025-12-18 | Hunter Ralph L. JR | Director | Grant | 37K | price not stated in the filing | not stated | 47K |
| 2025-12-18 | Ryan Robert John Andrew | Director | Grant | 37K | price not stated in the filing | not stated | 652K |
| 2025-12-18 | Wider Todd | Director | Grant | 37K | price not stated in the filing | not stated | 772K |
| 2025-12-18 | Kiessling Heather | Chief Financial Officer | Sell | 80K | $5.80 | $464K | 733K |
| 2025-12-08 | Ainscow Robert | Interim CEO and COO | Sell | 8K | $6.20 | $52K | 1.5M |
| 2025-12-01 | Mann Paul Elliot | Executive Chairman | Sell | 162K | $5.75 | $932K | 7.8M |
| 2025-11-25 | Mann Paul Elliot | Executive Officer | Sell | 50K | $5.77 | $289K | 7.9M |
| 2025-11-25 | Ainscow Robert | Interim CEO and COO | Sell | 25K | $5.77 | $144K | 1.6M |
| 2025-11-17 | Ainscow Robert | Interim CEO and COO | Sell | 68K | $7.51 | $507K | 1.6M |
| 2025-11-17 | Mann Paul Elliot | Executive Officer | Sell | 113K | $7.51 | $845K | 8.0M |
| 2025-11-12 | Moore Duncan | Director | Grant | 25K | price not stated in the filing | not stated | 1.0M |
| 2025-11-12 | Wider Todd | Director | Grant | 25K | price not stated in the filing | not stated | 736K |
| 2025-10-14 | Ainscow Robert | Interim CEO and COO | Sell | 23K | $13.60 | $306K | 1.6M |
| 2025-09-30 | Gorley Michael | Director | Sell | 64K | $9.75 | $624K | 81K |
| 2025-09-15 | Wider Todd | Director | Sell | 74K | $8.76 | $649K | 710K |
| 2025-09-14 | Wider Todd | Director | Exercise or conversion | 96K | $2.00 | $192K | 806K |
| 2025-09-14 | Wider Todd | Director | Tax withholding | 22K | $8.77 | $192K | 784K |
| 2025-09-09 | Mann Paul Elliot | Chief Executive Officer | Tax withholding | 234K | $8.53 | $2.0M | 8.2M |
| 2025-09-09 | Mann Paul Elliot | Chief Executive Officer | Exercise or conversion | 1.0M | $2.00 | $2.0M | 8.4M |
| 2025-09-09 | Mann Paul Elliot | Chief Executive Officer | Exercise or conversion | 216K | $2.00 | $432K | 7.5M |
| 2025-09-09 | Mann Paul Elliot | Chief Executive Officer | Sell | 81K | $8.39 | $680K | 8.1M |
| 2025-09-09 | Mann Paul Elliot | Chief Executive Officer | Tax withholding | 51K | $8.53 | $432K | 7.4M |
| 2025-09-09 | Ainscow Robert | Chief Operating Officer | Exercise or conversion | 12K | $2.00 | $24K | 1.6M |
| 2025-09-09 | Ainscow Robert | Chief Operating Officer | Exercise or conversion | 135K | $2.00 | $270K | 1.7M |
| 2025-09-09 | Ainscow Robert | Chief Operating Officer | Tax withholding | 3K | $8.53 | $24K | 1.6M |
| 2025-09-09 | Ainscow Robert | Chief Operating Officer | Tax withholding | 32K | $8.53 | $270K | 1.7M |
| 2025-09-09 | Ainscow Robert | Chief Operating Officer | Tax withholding | 4K | $8.53 | $37K | 1.6M |
| 2025-09-09 | Ainscow Robert | Chief Operating Officer | Exercise or conversion | 150K | $0.25 | $38K | 1.6M |
| 2025-09-08 | Mann Paul Elliot | Chief Executive Officer | Sell | 81K | $8.53 | $692K | 7.2M |
| 2025-09-08 | Ainscow Robert | Chief Operating Officer | Sell | 8K | $8.53 | $72K | 1.4M |
| 2025-09-06 | Hunter Ralph L. JR | Director | Grant | 10K | price not stated in the filing | not stated | 10K |
| 2025-08-29 | Moore Duncan | Director | Sell | 75K | $9.28 | $696K | 995K |
| 2025-08-01 | Ainscow Donald George | EVP, Gen Counsel, Secretary | Grant | 400K | price not stated in the filing | not stated | 500K |
| 2025-04-17 | Mann Paul Elliot | Chief Executive Officer | Sell | 317K | $5.62 | $1.8M | 7.3M |
| 2025-04-17 | Ainscow Robert | Chief Operating Officer | Sell | 67K | $5.62 | $375K | 1.4M |
| 2025-04-16 | Mann Paul Elliot | Chief Executive Officer | Sell | 317K | $5.45 | $1.7M | 7.6M |
| 2025-04-16 | Ainscow Robert | Chief Operating Officer | Sell | 67K | $5.45 | $363K | 1.5M |
| 2025-04-15 | Mann Paul Elliot | Chief Executive Officer | Sell | 317K | $5.75 | $1.8M | 7.9M |
| 2025-04-15 | Ainscow Robert | Chief Operating Officer | Sell | 67K | $5.75 | $383K | 1.6M |
| 2025-04-14 | Mann Paul Elliot | Chief Executive Officer | Grant | 1.4M | price not stated in the filing | not stated | 8.3M |
| 2025-04-14 | Kiessling Heather | Chief Financial Officer | Grant | 400K | price not stated in the filing | not stated | 813K |
| 2025-04-14 | Ainscow Robert | Chief Operating Officer | Grant | 400K | price not stated in the filing | not stated | 1.6M |
| 2024-12-09 | Moore Duncan | Director | Grant | 95K | price not stated in the filing | not stated | 1.1M |
| 2024-12-09 | Moore Duncan | Director | Grant | 78K | price not stated in the filing | not stated | 974K |
| 2024-11-20 | Gorley Michael | Director | Grant | 43K | price not stated in the filing | not stated | 144K |
| 2024-11-20 | Ryan Robert John Andrew | Director | Grant | 43K | price not stated in the filing | not stated | 615K |
| 2024-11-20 | Moore Duncan | Director | Grant | 43K | price not stated in the filing | not stated | 897K |
| 2024-11-20 | Wider Todd | Director | Grant | 43K | price not stated in the filing | not stated | 710K |
| 2024-10-11 | AK Jensen Investment Management Ltd | TenPercentOwner | Grant | 30K | $3.03 | $91K | 6.7M |
| 2024-09-06 | Mann Paul Elliot | Chief Executive Officer | Grant | 978K | price not stated in the filing | not stated | 6.8M |
| 2024-09-06 | Ainscow Robert | Chief Operating Officer | Grant | 300K | price not stated in the filing | not stated | 1.2M |
| 2024-08-13 | Gorley Michael | Director | Grant | 8K | price not stated in the filing | not stated | 102K |
| 2024-08-13 | Wider Todd | Director | Grant | 78K | price not stated in the filing | not stated | 572K |
| 2024-08-13 | Wider Todd | Director | Grant | 95K | price not stated in the filing | not stated | 668K |
| 2024-08-02 | AK Jensen Investment Management Ltd | TenPercentOwner | Sell | 80K | $2.23 | $178K | 6.6M |
| 2024-08-01 | AK Jensen Investment Management Ltd | TenPercentOwner | Sell | 32K | $2.45 | $78K | 6.6M |
| 2024-07-15 | Mann Paul Elliot | Chief Executive Officer | Buy | 40K | $2.50 | $100K | 5.8M |
| 2024-07-15 | Ainscow Robert | Chief Operating Officer | Buy | 20K | $2.50 | $50K | 920K |
| 2024-07-10 | AK Jensen Investment Management Ltd | TenPercentOwner | Buy | 62K | $3.40 | $210K | 6.7M |
| 2024-07-09 | AK Jensen Investment Management Ltd | TenPercentOwner | Buy | 30K | $3.05 | $92K | 6.6M |
| 2024-07-08 | AK Jensen Investment Management Ltd | TenPercentOwner | Buy | 70K | $3.05 | $214K | 6.6M |
| 2024-07-01 | Kiessling Heather | Chief Financial Officer | Grant | 400K | price not stated in the filing | not stated | 413K |
| 2024-04-30 | Ryan Robert John Andrew | Director | Buy | 8K | $3.34 | $25K | 572K |
| 2024-04-30 | Ryan Robert John Andrew | Director | Buy | 4K | $3.72 | $14K | 560K |
| 2024-04-30 | Ryan Robert John Andrew | Director | Buy | 5K | $3.36 | $17K | 565K |
| 2024-04-29 | Ryan Robert John Andrew | Director | Buy | 4K | $3.20 | $14K | 556K |
| 2024-04-26 | Ryan Robert John Andrew | Director | Buy | 5K | $3.48 | $17K | 552K |
| 2024-04-25 | Ryan Robert John Andrew | Director | Buy | 2K | $3.40 | $7K | 547K |
| 2024-04-25 | Ryan Robert John Andrew | Director | Buy | 3K | $3.46 | $9K | 545K |
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. JSON18 Form 144 notices on file for ASPI worth $7.1M at the prices reported; 3 in the last 90 days worth $458K. Latest: Ainscow Robert filed on 2026-10-14 to sell 22,500 shares ($47K) from 2026-10-14.
| Filed | Seller | Shares | Market value | Of outstanding | Sale from | Broker |
|---|---|---|---|---|---|---|
| 2026-10-14 | Ainscow RobertOFFICER | 23K | $47K | 0.015% | 2026-10-14 | Independent Trading Group (ITG) Inc. |
| 2026-09-02 | Mann Paul ElliotDIRECTOR, OFFICER | 84K | $317K | 0.055% | 2026-09-02 | Independent Trading Group (ITG) Inc. |
| 2026-09-02 | Ainscow RobertOFFICER | 25K | $95K | 0.016% | 2026-09-02 | Independent Trading Group (ITG) Inc. |
| 2026-06-30 | Ainscow Donald GeorgeOFFICER | 100K | $622K | 0.079% | 2026-06-30 | CitiGroup Global Mkts. Inc. |
| 2026-06-29 | Gorley MichaelDIRECTOR | 30K | $187K | 0.024% | 2026-06-29 | Independent Trading Group (ITG) Inc. |
| 2026-06-08 | Ainscow RobertOFFICER | 8K | $58K | 0.007% | 2026-06-08 | INDEPENDENT TRADING GROUP (ITG) INC. |
| 2026-06-01 | Mann Paul ElliotDIRECTOR, OFFICER | 251K | $2.0M | 0.200% | 2026-06-01 | Independent Trading Group (ITG) Inc. |
| 2026-04-17 | Moore DuncanDIRECTOR | 12K | $63K | 0.009% | 2026-04-16 | Independent Trading Group (ITG) Inc. |
| 2026-04-16 | Ainscow RobertOFFICER | 23K | $121K | 0.018% | 2026-04-16 | Independent Trading Group (ITG) Inc. |
| 2026-04-13 | Ainscow RobertOFFICER | 25K | $112K | 0.020% | 2026-04-13 | Independent Trading Group (ITG) Inc. |
| 2026-03-06 | Ainscow RobertOFFICER | 8K | $43K | 0.008% | 2026-03-06 | Independent Trading Group (ITG) Inc. |
| 2026-03-02 | Mann Paul ElliotDIRECTOR, OFFICER | 162K | $866K | 0.146% | 2026-03-02 | Independent Trading Group (ITG) Inc. |
| 2025-12-18 | Heather KiesslingChief Financial Officer | 80K | $461K | 0.072% | 2025-12-18 | J.P. Morgan Securities LLC |
| 2025-12-11 | Ainscow RobertOFFICER | 8K | $52K | 0.008% | 2025-12-08 | Independent Trading Group (ITG) Inc. |
| 2025-11-25 | Mann Paul ElliotDIRECTOR, OFFICER | 113K | $731K | 0.101% | 2025-11-15 | Independent Trading Group (ITG) Inc. |
| 2025-11-17 | Ainscow RobertOFFICER | 68K | $439K | 0.061% | 2025-11-17 | Independent Trading Group (ITG) Inc. |
| 2025-10-16 | Ainscow RobertOFFICER | 23K | $300K | 0.024% | 2025-10-14 | Independent Trading Group (ITG) Inc. |
| 2025-09-30 | Gorley MichaelDIRECTOR | 64K | $662K | 0.070% | 2025-09-30 | Independent Trading Group (ITG) Inc. |
Large holders (13D and 13G)
One row per reporting person with its latest filing, newest first. JSON5 holders report 5% or more of ASPI in their latest filing, all on Schedule 13G (passive). The largest reported stake is Mann Paul Elliot at 7.0% of the class (7,759,538 shares), filed 2026-02-17 for an event on 2025-12-31.
| Filed | Form | Holder | Shares | Of class | Event |
|---|---|---|---|---|---|
| 2026-04-27 | 13G/Ano. 1 | BlackRock, Inc.parent holding company | 8.3M | 6.6% | 2026-03-31 |
| 2026-03-26 | 13G/Ano. 1 | The Vanguard Groupinvestment adviser | 0 | 0.0% | 2026-03-13 |
| 2026-02-17 | 13G/Ano. 3 | Mann Paul Elliotindividual | 7.8M | 7.0% | 2025-12-31 |
| 2026-02-09 | 13G/Ano. 1 | BNP Paribas Asset Management UK Ltdinvestment adviser | 944K | 0.9% | 2025-12-31 |
| 2026-01-23 | 13G | Encompass Capital Advisors LLCinvestment adviser | 6.4M | 5.1% | 2026-01-16 |
| 2026-01-23 | 13G | Todd J. Kantorparent holding company, individual | 6.4M | 5.1% | 2026-01-16 |
| 2025-11-14 | 13G/Ano. 3 | AK Jensen Investment Management Ltdnon-US institution, other entity | 5.0M | 5.4% | 2025-09-30 |
13F holders
Tracked managers holding ASPI at their latest 13F. JSON3 of the 30 tracked managers held ASPI at their latest 13F, $3.1M 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 2 cut.
| Fund | Quarter | Shares | Value | Of portfolio | Change in shares |
|---|---|---|---|---|---|
| Citadel Advisors | 2026-06-30 | 358K | $2.2M | 0.00% | -410K |
| Point72 Asset Management | 2026-06-30 | 120K | $747K | 0.00% | new |
| AQR Capital Management | 2026-06-30 | 14K | $85K | 0.00% | -10K |
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
ASP Isotopes 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 ASP Isotopes (ASPI), SEC CIK 1921865, listed on Nasdaq, classified by the SEC as miscellaneous chemical products. 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 2026-09-30.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 2026-10-14.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 2026-04-27.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 2026-08-04.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 2026-10-16.JSON and CSV
- Company record
- EDGAR filing index for CIK 1921865Ticker, 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.
Other companies the SEC classifies as miscellaneous chemical products
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- MPWRMonolithic Power Systems
- MRKMerck
- MRNAModerna
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- MRVLMarvell Technology
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- MSCIMSCI
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- MSIMotorola Solutions
- MSTRStrategy
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Datasets
Frequently Asked Questions
How much of ASPI is sold short?
26,455,716 shares were held short at the 2026-09-30 settlement, 5.3 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 ASPI's daily short volume?
On 2026-10-23, 745,530 of the 1,254,694 ASPI shares reported to FINRA were sold short, 59.4% of the day's reported volume. Short volume is a flow for one day, not a position.
Does ASPI have fails to deliver?
The SEC's latest file shows 221,832 ASPI shares failed to deliver at settlement 2026-09-30. Fails are reported per settlement date and published twice a month with a lag.
Are ASPI insiders buying or selling?
Over the last 90 days ASPI insiders reported 2 open-market buys ($62K) against 8 sells ($1.3M), so the dollar flow leans toward selling. Latest filing: Kiessling Heather (Chief Financial Officer) on 2026-10-16.
Have ASPI insiders filed to sell?
18 Form 144 notices on file for ASPI worth $7.1M at the prices reported; 3 in the last 90 days worth $458K. Latest: Ainscow Robert filed on 2026-10-14 to sell 22,500 shares ($47K) from 2026-10-14.
Who owns 5% or more of ASPI?
5 holders report 5% or more of ASPI in their latest filing, all on Schedule 13G (passive). The largest reported stake is Mann Paul Elliot at 7.0% of the class (7,759,538 shares), filed 2026-02-17 for an event on 2025-12-31.
Which tracked 13F managers own ASPI?
3 of the 30 tracked 13F managers held ASPI shares at their latest filing, $3.1M in all. The largest: Ken Griffin's Citadel Advisors (358K shares, $2.2M), Steve Cohen's Point72 Asset Management (120K shares, $747K), Cliff Asness's AQR Capital Management (14K shares, $85K).
Data on this page is provided for informational purposes only and is not financial advice. See our editorial policy.