ASPI · ASP Isotopes Inc. · Holdings
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.
Institutional Ownership Trend
Holder Concentration
Across 189 13F filersWho Holds ASPI
Last 8 quarters through Sep 30, 2026 (filing window open)Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.
Jun 30, 2026, the newest closed quarter: 185 filers, like-for-like change +2.5%; actively managed books 0.0%; index-like books +6.8%.
| Holder type | Share | Filers | Change |
|---|---|---|---|
| Registered adviser | 43.8% | 85 | -5.6% |
| Exempt adviser | 1.4% | 3 | +2146.5% |
| Adviser | 0.6% | 2 | +259.8% |
| Bank | 14.7% | 14 | +15.8% |
| Insurer | 0.1% | 2 | +147.8% |
| Broker-dealer | 0.7% | 2 | -32.1% |
| Benefit plan | 0.2% | 2 | +73.4% |
| Non-US | 3.0% | 7 | +46.5% |
| Holding company | 17.1% | 8 | +4.8% |
| Unknown | 18.4% | 60 | -1.3% |
| Style | Share | Filers | Change |
|---|---|---|---|
| Index-like | 38.4% | 25 | +6.8% |
| Systematic-like | 7.1% | 16 | -0.6% |
| Concentrated | 7.7% | 22 | -17.7% |
| Diversified active | 46.7% | 122 | +3.8% |
| Not measured | 0.0% | 0 | — |
| Unknown | 0.0% | 0 | — |
| Turnover | Share | Filers | Change |
|---|---|---|---|
| Low turnover | 44.0% | 98 | +7.0% |
| Medium turnover | 21.4% | 39 | +9.7% |
| High turnover | 22.9% | 36 | -9.6% |
| Unknown | 11.7% | 12 | +1.0% |
| Not measured | 0.0% | 0 | — |
| Holding horizon | Share | Filers | Change |
|---|---|---|---|
| Short horizon | 14.3% | 23 | +3.4% |
| Medium horizon | 35.3% | 37 | +5.3% |
| Long horizon | 41.7% | 111 | +0.7% |
| Unknown | 8.8% | 14 | -0.9% |
| Not measured | 0.0% | 0 | — |
| 13F book size | Share | Filers | Change |
|---|---|---|---|
| Under $1B | 5.8% | 33 | -18.9% |
| $1B to $10B | 23.0% | 48 | -10.7% |
| $10B to $100B | 16.0% | 48 | +23.2% |
| $100B or more | 55.2% | 56 | +6.9% |
| Not measured | 0.0% | 0 | — |
| Client base | Share | Filers | Change |
|---|---|---|---|
| Individuals and high net worth | 2.0% | 40 | -36.4% |
| Pooled investment vehicles | 21.2% | 19 | -10.2% |
| Registered funds and BDCs | 19.3% | 10 | +3.6% |
| Pension and profit sharing plans | 0.0% | 2 | +26.8% |
| Insurance companies | 0.2% | 3 | +11.2% |
| Governments and sovereign funds | 0.3% | 2 | +7.9% |
| Other investment advisers | 0.0% | 3 | +212.0% |
| Diversified | 0.7% | 6 | +42.5% |
| Unknown | 56.2% | 100 | +9.9% |
| Private funds | Share | Filers | Change |
|---|---|---|---|
| Hedge funds | 22.6% | 23 | -3.9% |
| Private equity funds | 0.2% | 5 | +17.6% |
| Venture capital funds | 0.0% | 1 | 0.0% |
| Real estate funds | 0.0% | 3 | +2.2% |
| Securitized asset funds | 0.2% | 1 | +43.3% |
| Other private funds | 0.8% | 6 | -9.8% |
| Mixed private funds | 0.4% | 4 | -27.3% |
| Private funds, type not stated | 0.1% | 3 | new |
| No private funds | 20.7% | 42 | -1.5% |
| Unknown | 54.9% | 97 | +7.3% |
| Location | Share | Filers | Change |
|---|---|---|---|
| United States | 78.3% | 149 | -2.6% |
| Outside the US | 21.7% | 36 | +26.7% |
The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.
How the mix is measured
Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.
Excluded 1 holder with no observed 2026-03-31 13F and 2 holders with no observed 2026-06-30 13F. Compared across CIK changes: 4 filers continue as Evelyn Partners Group Ltd; JANUS HENDERSON GROUP PLC continues as Jupiter Topco LLC.
Conviction and Crowding
185 13F filers, quarter ended Jun 30, 2026Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.
Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).
Estimated Holder Cost Basis
Quarter ended Jun 30, 2026, on that quarter's share basisEstimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.
Estimated cost covers 81.8% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.
Shared Holders
Companies ASPI's active holders also own, quarter ended Jun 30, 2026Shareholder Targets
13F filers that own its peers but not ASPI, quarter ended Jun 30, 2026Found through its holder-overlap peers: LEU, GLNG, DFTX, BABA, FTAI, NTR, AXON, PSX, CCJ, GM, BA, FCX, COP, SPCX, INTU, NVDA, WMB, VLO, NSC, MSFT. 6,944 filers in all.
| # | Filer | In peers | Largest peers |
|---|---|---|---|
| 1 | NORGES BANK Non-US, Index-like | $113,575,053,822 14 held | NVDA, MSFT, VLO |
| 2 | Alphabet Inc. Unknown, Concentrated | $94,176,237,970 1 held | SPCX |
| 3 | Valor Management LLC Adviser, Concentrated | $86,013,406,595 1 held | SPCX |
| 4 | Capital Research Global Investors Adviser, Diversified active | $83,626,648,992 9 held | NVDA, MSFT, FCX |
| 5 | Capital World Investors Adviser, Diversified active | $57,745,064,103 14 held | NVDA, MSFT, BA |
| 6 | WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active | $52,609,949,276 20 held | NVDA, MSFT, WMB |
| 7 | VY Capital Management Co. Ltd. Exempt adviser, Concentrated | $46,441,712,890 1 held | SPCX |
| 8 | FRANKLIN RESOURCES INC Adviser, Diversified active | $46,204,765,820 20 held | NVDA, MSFT, GM |
| 9 | Capital International Investors Adviser, Diversified active | $46,114,120,511 11 held | MSFT, NVDA, FTAI |
| 10 | DIMENSIONAL FUND ADVISORS LP Registered adviser, Diversified active | $37,412,253,364 18 held | NVDA, MSFT, COP |
Fund Ownership of ASPI by Fund Type
Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026Index funds and index ETFs hold 11.83% of shares outstanding.
| Fund type | Of shares outstanding | Shares |
|---|---|---|
| Index funds | 2.52% | 3,856,926 |
| Index ETFs | 9.31% | 14,280,248 |
| Active ETFs | 0.00% | 3,522 |
| Active funds | 0.30% | 463,616 |
| Unclassified | 0.13% | 203,075 |
| All registered funds | 12.27% | 18,807,387 |
How fund types are measured
Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.
| Holder | Value (USD) | % of 13F | Shares | Type | Filed | Open |
|---|---|---|---|---|---|---|
| Mega BlackRock, Inc. Holding company | $57,330,966 | 12.37% | 9,217,198 | Shares | 2026-08-07 | |
| Mid Encompass Capital Advisors LLC Registered adviser | $40,814,109 | 8.81% | 6,561,754 | Shares | 2026-08-14 | |
| Mega VANGUARD CAPITAL MANAGEMENT LLC Registered adviser | $30,993,967 | 6.69% | 4,982,953 | Shares | 2026-08-13 | |
| Mid Rovida Investment Management Ltd | $25,502,000 | 5.50% | 4,100,000 | Shares | 2026-08-05 | |
| Mega UBS Group AG Bank | $20,200,276 | 4.36% | 3,247,633 | Shares | 2026-08-13 | |
| Mega GEODE CAPITAL MANAGEMENT, LLC Registered adviser | $18,323,503 | 3.95% | 2,945,901 | Shares | 2026-08-12 | |
| Large Alyeska Investment Group, L.P. Registered adviser | $17,686,588 | 3.82% | 2,843,503 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $16,250,994 | 3.51% | 2,612,700 | Call | 2026-08-14 | |
| Mega STATE STREET CORP Bank | $16,144,464 | 3.48% | 2,595,573 | Shares | 2026-09-22 | |
| Large EXCHANGE TRADED CONCEPTS, LLC Registered adviser | $14,029,265 | 3.03% | 2,255,509 | Shares | 2026-08-11 | |
| Mid AWM Investment Company, Inc. Registered adviser | $9,836,867 | 2.12% | 1,581,490 | Shares | 2026-08-14 | |
| Large BNP PARIBAS ASSET MANAGEMENT Holding S.A. Non-US | $9,809,038 | 2.12% | 1,577,016 | Shares | 2026-08-13 | |
| Large PEAK6 LLC Broker-dealer | $8,541,304 | 1.84% | 1,373,200 | Call | 2026-08-13 | |
| Small Philadelphia Financial Management of San Francisco, LLC Registered adviser | $8,353,503 | 1.80% | 1,343,007 | Shares | 2026-08-14 | |
| Mega SUSQUEHANNA INTERNATIONAL GROUP, LLP | $7,681,078 | 1.66% | 1,234,900 | Put | 2026-08-14 | |
| Mega MORGAN STANLEY Holding company | $7,229,627 | 1.56% | 1,162,320 | Shares | 2026-08-13 | |
| Mega VANGUARD PORTFOLIO MANAGEMENT LLC Registered adviser | $6,937,732 | 1.50% | 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 Registered adviser | $5,817,889 | 1.26% | 935,352 | Shares | 2026-08-14 | |
| Mega BARCLAYS PLC Bank | $5,273,197 | 1.14% | 847,781 | Shares | 2026-08-14 | |
| Mega MARSHALL WACE, LLP Exempt adviser | $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 | $4,904,849 | 1.06% | 788,561 | Shares | 2026-08-13 | |
| Mega JANE STREET GROUP, LLC | $4,852,844 | 1.05% | 780,200 | Call | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $4,826,720 | 1.04% | 776,000 | Call | 2026-09-02 | |
| Large Pacer Advisors, Inc. | $4,571,451 | 0.99% | 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 | 0.95% | 705,153 | Shares | 2026-08-14 | |
| Mega CITADEL ADVISORS LLC Registered adviser | $3,603,868 | 0.78% | 579,400 | Put | 2026-09-02 | |
| Mega GOLDMAN SACHS GROUP INC Holding company | $3,584,435 | 0.77% | 576,276 | Shares | 2026-08-14 | |
| Small WIM INVESTMENT MANAGEMENT Ltd | $3,367,508 | 0.73% | 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 Bank | $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 Broker-dealer | $2,851,142 | 0.62% | 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 Registered adviser | $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 Registered adviser | $1,928,200 | 0.42% | 310,000 | Put | 2026-08-14 | |
| Mid HITE Hedge Asset Management LLC Registered adviser | $1,877,426 | 0.41% | 301,837 | Shares | 2026-08-14 | |
| Mid Chicago Partners Investment Group LLC Registered adviser | $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. Registered adviser | $1,626,343 | 0.35% | 261,470 | Shares | 2026-08-14 | |
| Mega JPMORGAN CHASE & CO Bank | $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 Registered adviser | $1,400,053 | 0.30% | 225,089 | Shares | 2026-08-17 | |
| Large DNB Asset Management AS Adviser | $1,336,553 | 0.29% | 214,880 | Shares | 2026-08-11 | |
| Mega Swiss National Bank | $1,335,434 | 0.29% | 214,700 | Shares | 2026-08-11 | |
| Mega Invesco Ltd. Adviser | $1,268,730 | 0.27% | 203,976 | Shares | 2026-08-14 | |
| Small Purewater Capital LLC Registered adviser | $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 | |
| Mega STIFEL FINANCIAL CORP | $1,032,731 | 0.22% | 166,034 | Shares | 2026-08-12 | |
| Mid Aquatic Capital Management LLC Registered adviser | $1,019,943 | 0.22% | 163,978 | Shares | 2026-08-14 | |
| Mega UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC Registered adviser | $1,002,781 | 0.22% | 161,219 | Shares | 2026-08-13 | |
| Mega Cetera Investment Advisers Registered adviser | $951,442 | 0.21% | 152,965 | Shares | 2026-08-12 | |
| Large POLEN CAPITAL MANAGEMENT LLC Registered adviser | $930,256 | 0.20% | 149,559 | Shares | 2026-08-04 | |
| Mega RHUMBLINE ADVISERS Registered adviser | $878,786 | 0.19% | 141,284 | Shares | 2026-08-12 | |
| Large Squarepoint Ops LLC Registered adviser | $770,975 | 0.17% | 123,951 | Shares | 2026-08-14 | |
| Mega CITIGROUP INC Bank | $754,541 | 0.16% | 121,309 | Shares | 2026-08-03 | |
| Mega CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM Benefit plan | $754,131 | 0.16% | 121,243 | Shares | 2026-08-24 | |
| Mega DEUTSCHE BANK AG\ Non-US | $748,682 | 0.16% | 120,367 | Shares | 2026-08-07 | |
| Large Point72 Asset Management, L.P. Registered adviser | $747,388 | 0.16% | 120,159 | Shares | 2026-08-14 | |
| Mega WELLS FARGO & COMPANY/MN Bank | $722,259 | 0.16% | 116,119 | Shares | 2026-08-14 | |
| Mega ALLIANCEBERNSTEIN L.P. Registered adviser | $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 | |
| Mid Inspire Investing, LLC Registered adviser | $626,248 | 0.14% | 236,320 | Shares | 2026-10-22 | |
| Large Marex Group plc | $622,622 | 0.13% | 100,100 | Shares | 2026-08-14 | |
| Mega NATIONAL BANK OF CANADA /FI/ Bank | $622,000 | 0.13% | 100,000 | Shares | 2026-08-10 | |
| Mega PRICE T ROWE ASSOCIATES INC /MD/ Registered adviser | $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 | 0.13% | 93,400 | Call | 2026-08-14 | |
| Large OSAIC HOLDINGS, INC. Holding company | $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 | |
| Mid SBI Securities Co., Ltd. Non-US | $483,049 | 0.10% | 182,283 | Shares | 2026-10-22 | |
| Large Centiva Capital, LP Registered adviser | $466,500 | 0.10% | 75,000 | Call | 2026-08-13 | |
| Mid Pekin Hardy Strauss, Inc. Registered adviser | $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 Registered adviser | $440,108 | 0.09% | 70,757 | Shares | 2026-07-30 | |
| Mega SEI INVESTMENTS CO Holding company | $434,131 | 0.09% | 69,796 | Shares | 2026-08-14 | |
| Large MetLife Investment Management, LLC Registered adviser | $433,701 | 0.09% | 69,727 | Shares | 2026-08-14 | |
| Mid PRELUDE CAPITAL MANAGEMENT, LLC Registered adviser | $413,661 | 0.09% | 66,505 | Shares | 2026-08-14 | |
| Small MH & ASSOCIATES SECURITIES MANAGEMENT CORP /ADV Registered adviser | $387,288 | 0.08% | 62,265 | Shares | 2026-07-28 | |
| Mega Creative Planning Registered adviser | $346,944 | 0.07% | 55,779 | Shares | 2026-08-13 | |
| Mid Kingsview Wealth Management, LLC Registered adviser | $336,514 | 0.07% | 54,102 | Shares | 2026-08-19 | |
| Large MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. | $333,628 | 0.07% | 53,638 | Shares | 2026-08-14 | |
| Mid Bleakley Financial Group, LLC Registered adviser | $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. Registered adviser | $274,302 | 0.06% | 44,100 | Call | 2026-08-14 | |
| Mega Vanguard Global Advisers, LLC Registered adviser | $267,578 | 0.06% | 43,019 | Shares | 2026-08-13 | |
| Small Canal Insurance CO | $265,000 | 0.06% | 100,000 | Shares | 2026-10-20 | |
| Small FNY Investment Advisers, LLC | $253,340 | 0.05% | 95,600 | Shares | 2026-10-16 | |
| Large Brevan Howard Capital Management LP Exempt adviser | $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 | |
| Mega ROYAL BANK OF CANADA Bank | $237,802 | 0.05% | 38,232 | Shares | 2026-08-14 | |
| Mid Advisory Services Network, LLC | $212,487 | 0.05% | 34,162 | Shares | 2026-08-12 |
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