ASP Isotopes Inc. (ASPI)
Nasdaq: ASPI · Miscellaneous Chemical Products · Washington, DC · filing with the SEC since 2022
Who owns ASP Isotopes Inc.
As filed with the SECHolders of 5% or more
4
Mann Paul Elliot holds 7% of Common Stock, $0.01 par value, as its SCHEDULE 13G/A filed Feb 17, 2026 says.
Directors and officers
9
report now, of 12 people on the record since 2022. Their holdings as a group are not read here.
Institutions as a whole
n/a
The record does not read the share held by managers that file Form 13F, so none is printed and no split of the rest is estimated. What it holds is the 4 named at left.
Holders of 5% or moreshare of the class, as filed
Mann Paul Elliot
SCHEDULE 13G/A · filed Feb 17, 2026 · Common Stock, $0.01 par value · 10.8% in Feb 18, 2025
Blackrock, Inc.
SCHEDULE 13G/A · filed Apr 27, 2026 · Common Stock · 5.5% in Feb 4, 2025
AK Jensen Investment Management Ltd
SCHEDULE 13G/A · filed Nov 14, 2025 · Common stock, par value $0.01 per share · 6.6% in Feb 12, 2025
Encompass Capital Advisors LLC
SCHEDULE 13G · filed Jan 23, 2026 · Common Stock, par value $0.01
AWM Investment Company, Inc.
SCHEDULE 13G/A · filed Aug 14, 2025 · Common Stock · reported falling below 5%, from 6.9% in Aug 14, 2025
BNP Paribas Asset Management UK Ltd
SCHEDULE 13G/A · filed Feb 9, 2026 · Common Stock · reported falling below 5%, from 5.1% in Apr 11, 2025
The Vanguard Group
SCHEDULE 13G/A · filed Mar 26, 2026 · Common Stock · reported falling below 5%, from 5.77% in Jan 30, 2026
What ASPI reports owning in othersstakes of 5% or more, and other ties
Skyline Builders Group Holding Limited KAZR
SCHEDULE 13D · filed Sep 22, 2025 · Class A ordinary shares, $0.00001 par value per share
ENDRA Life Sciences Inc. NDRA
SCHEDULE 13D · filed Oct 8, 2026 · Common Stock, par value $0.0001 per share
Other ties the annual report names
Quantum Leap Energy LLC
An entity · consolidated entity · owns, named in the 10-K filed Apr 10, 2026
Critical Minerals Space Investment
An investee · investee · invested in, named in the 10-K filed Apr 10, 2026
IsoBio Inc
An investee · investee · invested in, named in the 10-K filed Apr 10, 2026
East Coast Nuclear Pharmacy, LLC
A company bought · acquisition · Oct 2025 · owns, named in the 10-K filed Apr 10, 2026
Skyline Builders Group Holding Ltd
A company bought · acquisition · Aug 2025 · owns, named in the 10-K filed Apr 10, 2026
One 30 Seven Inc
A company bought · acquisition · owns, named in the 10-K filed Apr 10, 2026
Opeongo
A company bought · acquisition · owns, named in the 10-K filed Apr 10, 2026
Skyline
A company bought · acquisition · owns, named in the 10-K filed Apr 10, 2026
23 subsidiaries in 7 countries, from the list filed with the 10-K filed Apr 10, 2026.
Insider tradesForm 4
30sales
2purchases
23sales on a scheduled plan
7people selling
$9.5Msold, in dollars
$100,000bought, in dollars
Open-market trades on Form 4 from Oct 21, 2025 to Oct 21, 2026. A scheduled plan is a selling program set in advance under SEC rule 10b5-1. The trades are listed as filed and do not feed the grade.
By calendar yearSoldBought
2026 runs to Oct 21, 2026. Dollars as filed, summed by the transaction date.
People who traded in the window8 of 14 on the roster
| Person | Role as filed | Sales | Sold | On a plan | Buys | Bought |
|---|---|---|---|---|---|---|
| Mann Paul Elliot | Chairman and CEO | 10 | $6.0M | 10 | 0 | $0 |
| Ainscow Robert | COO | 10 | $1.2M | 10 | 0 | $0 |
| Kiessling Heather | Chief Financial Officer | 4 | $800,000 | 2 | 0 | $0 |
| Ainscow Donald George | EVP, Gen Counsel, Secretary | 2 | $700,000 | 0 | 0 | $0 |
| Wider Todd | director | 2 | $600,000 | 0 | 0 | $0 |
| Gorley Michael | director | 1 | $200,000 | 0 | 0 | $0 |
| Moore Duncan | director | 1 | $100,000 | 1 | 0 | $0 |
| Ryan Robert John Andrew | director | 0 | $0 | 0 | 2 | $100,000 |