ASP Isotopes Inc.
DE ˙ DB ˙ US00218A1051
SecurityDE:W62 / ASP Isotopes Inc.
InstitutionNorthern Trust Corp
Latest Disclosed Ownership937,523 shares
Latest Disclosed Value $ 4,143,852
Northern Trust Corp reports 25.69% increase in ownership of W62 / ASP Isotopes Inc.

On May 14, 2026 - Northern Trust Corp filed a 13F-HR form disclosing ownership of 937,523 shares of ASP Isotopes Inc. (DE:W62) valued at $4,143,852 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 745,909 shares of ASP Isotopes Inc.. This represents a change in shares of 25.69% during the quarter.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-14 2026-03-31 13F ASP ISOTOPES COM 00218A105 937,523 191,614 25.69 4,144 3.83 0.0001
2026-02-17 2025-12-31 13F ASP ISOTOPES COM 00218A105 745,909 145,860 24.31 3,991 -30.87 0.0005
2025-11-14 2025-09-30 13F ASP ISOTOPES COM 00218A105 600,049 166,761 38.49 5,772 81.05 0.0007
2025-08-13 2025-06-30 13F ASP ISOTOPES COM 00218A105 433,288 -27,441 -5.96 3,189 47.59 0.0004
2025-05-13 2025-03-31 13F ASP ISOTOPES COM 00218A105 460,729 25,041 5.75 2,161 9.48 0.0003
2025-02-14 2024-12-31 13F ASP ISOTOPES COM 00218A105 435,688 58,525 15.52 1,974 88.26 0.0003
2024-11-13 2024-09-30 13F ASP ISOTOPES COM 00218A105 377,163 304,167 416.69 1,049 369.96 0.0002
2024-08-14 2024-06-30 13F ASP ISOTOPES COM 00218A105 72,996 12,942 21.55 223 -10.08 0.0000
2024-05-14 2024-03-31 13F ASP ISOTOPES COM 00218A105 60,054 36,828 158.56 248 504.88 0.0000
2024-02-13 2023-12-31 13F ASP ISOTOPES COM 00218A105 23,226 1,075 4.85 42 95.24 0.0000
2023-11-13 2023-09-30 13F ASP ISOTOPES COM 00218A105 22,151 22,151 21 0.0000
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.