ASPI · ASP Isotopes Inc.
Market Cap
$643.90M
Shares
153.31M
Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.
Holders: 189
Total Value: $465,071,600
Total Shares: 74,770,372
Showing 1–100
of 200 holdings by value
· page 1 of 2
Institutional Ownership Trend
15 quarters
Holder Concentration
Across 189 13F filers · Δ vs Mar 31, 2026Top Holder
12.3%
+1.0 pts
Top 5
39.3%
−1.2 pts
Top 10
58.6%
−0.1 pts
HHI
462
Broadly held−4
Quarterly Activity
vs Mar 31, 2026
New
40
Increased
77
Decreased
52
Sold Out
31
Unchanged
20
Holder count:
+9
Institutional value:
+43.3%
Shares held:
+1.9%
Top Buyers
vs Mar 31, 2026| Institution | Added | Now Holds | Open |
|---|---|---|---|
| Mega BlackRock, Inc. | +889,054 | 9,217,198 | |
| Mega UBS Group AG | +762,824 | 3,754,533 | |
| Small Philadelphia Financial Management of San Francisco, LLC | +694,666 | 1,343,007 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. | +689,771 | 1,577,016 | |
| Mega BANK OF AMERICA CORP /DE/ | +540,060 | 709,057 |
Top Sellers
vs Mar 31, 2026| Institution | Sold | Now Holds | Open |
|---|---|---|---|
| Mega CITADEL ADVISORS LLC | −929,015 | 1,712,991 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | −780,087 | 4,552,753 | |
| Mid AWM Investment Company, Inc. | −543,006 | 1,581,490 | |
| Small Creek Drive Management Group LLC | −425,300 | 424,800 | |
| Small Diametric Capital, LP | −414,988 | 538,517 |
Top New Positions
vs Mar 31, 2026| Institution | Acquired | Value (USD) | Open |
|---|---|---|---|
| Large MARSHALL WACE, LLP | 835,656 | $5,197,780 | |
| Large Man Group plc | 828,377 | $5,152,504 | |
| Mid Aquatic Capital Management LLC | 163,978 | $1,019,943 | |
| Small Polymer Capital Management (US) LLC | 105,494 | $656,172 | |
| Mid WINTON GROUP Ltd | 94,512 | $587,864 |
Top Sold-Out Positions
vs Mar 31, 2026| Institution | Previously Held | Last Value (USD) | Open |
|---|---|---|---|
| Small Sara-Bay Financial | 586,673 | $2,593,094 | |
| Small Alight Capital Management LP | 300,000 | $1,326,000 | |
| Mid Yaupon Capital Management LP | 300,000 | $1,326,000 | |
| Mid IMC-Chicago, LLC | 268,469 | $1,186,632 | |
| Mid Burkehill Global Management, LP | 250,000 | $1,105,000 |
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. | $57,330,966 | 12.33% | 9,217,198 | Shares | 2026-08-07 | |
| Mid Encompass Capital Advisors LLC | $40,814,109 | 8.78% | 6,561,754 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC | $30,993,967 | 6.66% | 4,982,953 | Shares | 2026-08-13 | |
| Mid Rovida Investment Management Ltd | $25,502,000 | 5.48% | 4,100,000 | Shares | 2026-08-05 | |
| Mega UBS Group AG | $20,200,276 | 4.34% | 3,247,633 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC | $18,323,503 | 3.94% | 2,945,901 | Shares | 2026-08-12 | |
| Large Alyeska Investment Group, L.P. | $17,686,588 | 3.80% | 2,843,503 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16,250,994 | 3.49% | 2,612,700 | Call | 2026-08-14 | |
| Mega STATE STREET CORP | $16,144,464 | 3.47% | 2,595,573 | Shares | 2026-08-07 | |
| Large EXCHANGE TRADED CONCEPTS, LLC | $14,029,265 | 3.02% | 2,255,509 | Shares | 2026-08-11 | |
| Mid AWM Investment Company, Inc. | $9,836,867 | 2.12% | 1,581,490 | Shares | 2026-08-14 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. | $9,809,038 | 2.11% | 1,577,016 | Shares | 2026-08-13 | |
| Large PEAK6 LLC | $8,541,304 | 1.84% | 1,373,200 | Call | 2026-08-13 | |
| Small Philadelphia Financial Management of San Francisco, LLC | $8,353,503 | 1.80% | 1,343,007 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $7,681,078 | 1.65% | 1,234,900 | Put | 2026-08-14 | |
| Mega MORGAN STANLEY | $7,229,627 | 1.55% | 1,162,320 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC | $6,937,732 | 1.49% | 1,115,391 | Shares | 2026-08-13 | |
| Mega NORTHERN TRUST CORP Bank | $6,264,869 | 1.35% | 1,007,214 | Shares | 2026-08-13 | |
| Mega CHARLES SCHWAB INVESTMENT MANAGEMENT INC | $5,817,889 | 1.25% | 935,352 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC | $5,273,197 | 1.13% | 847,781 | Shares | 2026-08-14 | |
| Large MARSHALL WACE, LLP | $5,197,780 | 1.12% | 835,656 | Shares | 2026-08-13 | |
| Large Man Group plc | $5,152,504 | 1.11% | 828,377 | Shares | 2026-08-14 | |
| Mega VANGUARD FIDUCIARY TRUST CO Bank | $4,904,849 | 1.05% | 788,561 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $4,852,844 | 1.04% | 780,200 | Call | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $4,826,720 | 1.04% | 776,000 | Call | 2026-09-02 | |
| Large Pacer Advisors, Inc. | $4,571,451 | 0.98% | 734,960 | Shares | 2026-08-13 | |
| Mega BANK OF AMERICA CORP /DE/ Bank | $4,410,334 | 0.95% | 709,057 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $4,386,051 | 0.94% | 705,153 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC | $3,603,868 | 0.77% | 579,400 | Put | 2026-09-02 | |
| Mega GOLDMAN SACHS GROUP INC | $3,584,435 | 0.77% | 576,276 | Shares | 2026-08-14 | |
| Small WIM INVESTMENT MANAGEMENT Ltd | $3,367,508 | 0.72% | 541,400 | Shares | 2026-08-06 | |
| Mega JANE STREET GROUP, LLC | $3,351,958 | 0.72% | 538,900 | Put | 2026-08-14 | |
| Small Diametric Capital, LP | $3,349,575 | 0.72% | 538,517 | Shares | 2026-08-14 | |
| Mega UBS Group AG | $3,152,918 | 0.68% | 506,900 | Call | 2026-08-13 | |
| Mega Nuveen, LLC | $3,069,077 | 0.66% | 493,421 | Shares | 2026-08-11 | |
| Mid GROUP ONE TRADING LLC | $2,851,142 | 0.61% | 458,383 | Shares | 2026-08-14 | |
| Small Creek Drive Management Group LLC | $2,642,256 | 0.57% | 424,800 | Call | 2026-08-13 | |
| Mid Shay Capital LLC | $2,568,860 | 0.55% | 413,000 | Shares | 2026-08-14 | |
| Large Rathbones Group PLC | $2,373,670 | 0.51% | 381,619 | Shares | 2026-07-23 | |
| Mega CITADEL ADVISORS LLC | $2,224,215 | 0.48% | 357,591 | Shares | 2026-09-02 | |
| Mega Bank of New York Mellon Corp Bank | $2,219,741 | 0.48% | 356,872 | Shares | 2026-08-06 | |
| Mid Caprock Group, LLC | $1,998,890 | 0.43% | 321,365 | Shares | 2026-07-27 | |
| Small Crawford Fund Management, LLC | $1,928,200 | 0.41% | 310,000 | Put | 2026-08-14 | |
| Mid HITE Hedge Asset Management LLC | $1,877,426 | 0.40% | 301,837 | Shares | 2026-08-14 | |
| Mid Chicago Partners Investment Group LLC | $1,651,154 | 0.36% | 265,459 | Shares | 2026-07-30 | |
| Mega BANK OF MONTREAL /CAN/ Bank | $1,633,123 | 0.35% | 262,560 | Shares | 2026-08-12 | |
| Mid Saba Capital Management, L.P. | $1,626,343 | 0.35% | 261,470 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO | $1,499,354 | 0.32% | 241,054 | Shares | 2026-08-12 | |
| Small Headlands Technologies LLC | $1,494,025 | 0.32% | 240,197 | Shares | 2026-08-13 | |
| Large Empowered Funds, LLC | $1,400,053 | 0.30% | 225,089 | Shares | 2026-08-17 | |
| Large DNB Asset Management AS | $1,336,553 | 0.29% | 214,880 | Shares | 2026-08-11 | |
| Mega Swiss National Bank Bank | $1,335,434 | 0.29% | 214,700 | Shares | 2026-08-11 | |
| Mega Invesco Ltd. | $1,268,730 | 0.27% | 203,976 | Shares | 2026-08-14 | |
| Micro Purewater Capital LLC | $1,209,087 | 0.26% | 194,387 | Shares | 2026-07-28 | |
| Mega Russell Investments Group, Ltd. | $1,130,644 | 0.24% | 181,776 | Shares | 2026-08-06 | |
| Large STIFEL FINANCIAL CORP | $1,032,731 | 0.22% | 166,034 | Shares | 2026-08-12 | |
| Mid Aquatic Capital Management LLC | $1,019,943 | 0.22% | 163,978 | Shares | 2026-08-14 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC | $1,002,781 | 0.22% | 161,219 | Shares | 2026-08-13 | |
| Mid SBI Securities Co., Ltd. Broker-Dealer | $991,132 | 0.21% | 159,346 | Shares | 2026-07-23 | |
| Large Cetera Investment Advisers | $951,442 | 0.20% | 152,965 | Shares | 2026-08-12 | |
| Large POLEN CAPITAL MANAGEMENT LLC | $930,256 | 0.20% | 149,559 | Shares | 2026-08-04 | |
| Mega RHUMBLINE ADVISERS | $878,786 | 0.19% | 141,284 | Shares | 2026-08-12 | |
| Large Squarepoint Ops LLC | $770,975 | 0.17% | 123,951 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC | $754,541 | 0.16% | 121,309 | Shares | 2026-08-03 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Pension | $754,131 | 0.16% | 121,243 | Shares | 2026-08-24 | |
| Mega DEUTSCHE BANK AG\ Bank | $748,682 | 0.16% | 120,367 | Shares | 2026-08-07 | |
| Large Point72 Asset Management, L.P. | $747,388 | 0.16% | 120,159 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN | $722,259 | 0.16% | 116,119 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. | $670,453 | 0.14% | 107,790 | Shares | 2026-08-14 | |
| Small Polymer Capital Management (US) LLC | $656,172 | 0.14% | 105,494 | Shares | 2026-08-14 | |
| Large Marex Group plc | $622,622 | 0.13% | 100,100 | Shares | 2026-08-14 | |
| Small Canal Insurance CO Insurance | $622,000 | 0.13% | 100,000 | Shares | 2026-07-21 | |
| Mega NATIONAL BANK OF CANADA /FI/ Bank | $622,000 | 0.13% | 100,000 | Shares | 2026-08-10 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ | $602,798 | 0.13% | 96,913 | Shares | 2026-08-14 | |
| Mid WINTON GROUP Ltd | $587,864 | 0.13% | 94,512 | Shares | 2026-08-07 | |
| Mega D. E. Shaw & Co., Inc. | $580,948 | 0.12% | 93,400 | Call | 2026-08-14 | |
| Large OSAIC HOLDINGS, INC. | $559,028 | 0.12% | 89,876 | Shares | 2026-08-14 | |
| Mega Legal & General Group Plc | $540,833 | 0.12% | 86,951 | Shares | 2026-08-14 | |
| Small FNY Investment Advisers, LLC | $498,222 | 0.11% | 80,100 | Shares | 2026-07-08 | |
| Mid Centiva Capital, LP | $466,500 | 0.10% | 75,000 | Call | 2026-08-13 | |
| Small Pekin Hardy Strauss, Inc. | $463,079 | 0.10% | 74,450 | Shares | 2026-07-30 | |
| Mega VANGUARD ASSET MANAGEMENT, Ltd | $462,195 | 0.10% | 74,308 | Shares | 2026-08-13 | |
| Mid Penn Capital Management Company, LLC | $440,108 | 0.09% | 70,757 | Shares | 2026-07-30 | |
| Large SEI INVESTMENTS CO | $434,131 | 0.09% | 69,796 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC | $433,701 | 0.09% | 69,727 | Shares | 2026-08-14 | |
| Large FORT WASHINGTON INVESTMENT ADVISORS INC /OH/ | $417,585 | 0.09% | 67,136 | Shares | 2026-07-17 | |
| Mid PRELUDE CAPITAL MANAGEMENT, LLC | $413,661 | 0.09% | 66,505 | Shares | 2026-08-14 | |
| Mid Farther Finance Advisors, LLC | $389,483 | 0.08% | 62,618 | Shares | 2026-07-17 | |
| Small MH & ASSOCIATES SECURITIES MANAGEMENT CORP /ADV Broker-Dealer | $387,288 | 0.08% | 62,265 | Shares | 2026-07-28 | |
| Large Creative Planning | $346,944 | 0.07% | 55,779 | Shares | 2026-08-13 | |
| Mid Kingsview Wealth Management, LLC | $336,514 | 0.07% | 54,102 | Shares | 2026-08-19 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. Mutual Fund | $333,628 | 0.07% | 53,638 | Shares | 2026-08-14 | |
| Mid Bleakley Financial Group, LLC | $310,713 | 0.07% | 49,954 | Shares | 2026-08-05 | |
| Mega AMERICAN CENTURY COMPANIES INC | $298,690 | 0.06% | 48,021 | Shares | 2026-08-12 | |
| Large Point72 Asset Management, L.P. | $274,302 | 0.06% | 44,100 | Call | 2026-08-14 | |
| Mega Vanguard Global Advisers, LLC | $267,578 | 0.06% | 43,019 | Shares | 2026-08-13 | |
| Mid Ninety One SA (Pty) Ltd | $251,841 | 0.05% | 40,489 | Shares | 2026-07-16 | |
| Mid Brevan Howard Capital Management LP | $246,162 | 0.05% | 39,576 | Shares | 2026-08-14 | |
| Mega Jupiter Topco LLC | $242,580 | 0.05% | 39,000 | Shares | 2026-08-14 | |
| Mid PFG Investments, LLC | $238,848 | 0.05% | 38,400 | Shares | 2026-07-23 |
Key facts
CIK
1921865
CUSIP
00218A105
13F (30d)
124 filings
124 filers
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