NasdaqMaterialsMiscellaneous Chemical ProductsDALLAS, TX

ASP Isotopes Inc. ASPI

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Estimated market cap $266.76M153.31M shares, shares as of Aug 14, 2026CIK 1921865

Insider trades, 12 mo

1 buy · 30 sells

$9.53M sold, open market

Congress trades, 24 mo

—

No disclosed trades

13F holders, Q3 2026

109

31.8% of shares · 45 added

13F holders

…

Lobbying, 12 mo

—

No lobbying filings

Federal contracts, 12 mo

—

None matched

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Latest 10-Q

Q2 2026

What changed in ASP Isotopes Inc.'s latest quarterly report, compared with the one before.

Filed Aug 14, 2026 · Quarter ended Jun 30, 2026

Compared with the 10-Q for the quarter ended Mar 31, 2026. Sections compared: management's discussion, risk factors, legal proceedings and controls and procedures.

Read the 10-Q on sec.gov ↗Filing index ↗

Latest 10-Q

What changed in ASP Isotopes Inc.'s latest quarterly report, compared with the one before.

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Insider trades

31 in 12 mo

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

No open-market insider trades reported since Oct 16, 2026. Insiders have two business days to file.

Recent insider trades

Heather Kiessling Chief Financial Officer	Oct 16 Form 4 ↗	Sale	−$47.8K 21,830 sh @ $2.19	-17.5%
Robert Ainscow COO	Oct 14 Form 4 ↗	Sale 10b5-1 plan	−$47.6K 22,500 sh @ $2.11	-14.0%
Robert John Andrew Ryan Director	Sep 28 Form 4 ↗	Buy	+$21.6K 8,000 sh @ $2.70	-31.6%
Robert Ainscow COO	Sep 8 Form 4 ↗	Sale 10b5-1 plan	−$36.2K 8,438 sh @ $4.29	-57.3%
Paul Elliot Mann Chairman and CEO, Director	Sep 4 Form 4 ↗	Sale 10b5-1 plan	−$343.4K 83,759 sh @ $4.10	-56.5%

All ASPI insider trades →Planned sales (Form 144): see notices

Insider trades

Open-market trades from Form 4. 10b5-1 marks a plan set in advance.

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13F holders

48.77M shares

109 funds report ASPI. Values checked against market prices.

Funds own 52% of shares (Q2 2026)

188 funds hold the stock.

Q3 2026: 32% · 5,560 of ~8,900 funds reported so far

Q2 202555%
Q3 202548%
Q4 202553%
Q1 202651%
Q2 202652%
Q3 2026 (so far)32%

Q3 2026. 16 new, 45 added to, 36 trimmed, 96 exited since Q2 2026.

Top 13F holders
#
1	BlackRock, Inc. 13F ↗	10.83M	$28.7M	+17.5%
2	UBS Group AG 13F ↗	6.31M	$16.7M	+94.3%
3	Vanguard Capital Management LLC 13F ↗	6.07M	$16.1M	+21.9%
4	Rovida Investment Management Ltd 13F ↗	4.10M	$10.9M	unchanged
5	Geode Capital Management, LLC 13F ↗	3.68M	$9.7M	+24.8%
6	State Street Corp 13F ↗	2.90M	$7.7M	+11.6%
7	Vanguard Portfolio Management LLC 13F ↗	1.40M	$3.7M	+25.4%
8	AWM Investment Company, Inc. 13F ↗	1.19M	$3.2M	-24.7%
9	Vanguard Fiduciary Trust Co 13F ↗	988,415	$2.6M	+25.3%
10	Morgan Stanley 13F ↗	981,819	$2.6M	-15.5%

Download CSV Every fund that holds ASPI, not only these ten. A download holds at most 10,000 rows; narrow the filters to get a smaller slice.

13F holders

Funds that report this stock, checked against market prices.

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Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

No recent congressional trades for this company.

Trades by members of Congress

Disclosed in dollar ranges, up to 45 days after the trade.

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Lobbying

What ASP Isotopes Inc. and its lobbying firms report each quarter.

No recent lobbying filings for this company.

Lobbying

What ASP Isotopes Inc. and its lobbying firms report each quarter.

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Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

Funds holding the stock

Shares they report

Funds holding the stock by quarter

Q4 2022	3	—	47,212	$75.3K
Q1 2023	6	+3	3.25M	$2.8M
Q2 2023	4	-2	551,482	$1.0M
Q3 2023	11	+7	308,068	$292.9K
Q4 2023	19	+8	1.67M	$3.0M
Q1 2024	31	+12	4.00M	$16.5M
Q2 2024	51	+20	8.81M	$26.9M
Q3 2024	69	+18	22.42M	$62.5M
Q4 2024	95	+26	32.51M	$147.3M
Q1 2025	102	+7	32.60M	$152.9M
Q2 2025	132	+30	41.54M	$305.7M
Q3 2025	159	+27	53.31M	$512.6M
Q4 2025	176	+17	58.99M	$315.6M
Q1 2026	180	+4	64.25M	$284.3M
Q2 2026	188	+8	65.43M	$406.2M
Q3 2026	109	-79	48.77M	$129.2M

Each point is a quarter-end, from Q4 2022 to Q3 2026. A fund's 13F lists its long positions in US-listed securities as of the last day of the quarter and arrives up to 45 days later, so each point shows holdings at quarter-end, not on the day they were reported.

Common shares only; options and bonds are left out. When a fund amends a report, the amended version is the one counted.

The history follows the company's current CUSIP number (00218A105). If the company's shares were ever re-issued under a different CUSIP, the quarters before the change are not part of this series, so the first point (Q4 2022) can be later than the stock's first appearance in 13F reports.

Share counts are adjusted for stock splits; none took place between these quarters. Values are in dollars as reported at the time and are not adjusted.

A quarter appears once our daily update has built its summary. If a summary cannot be built, older reports are kept and the chart shows the quarters it has until the next update repairs it.

Institutional ownership over time

How many funds reported holding the stock at the end of each quarter, and how many shares they held between them.

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More filings and data

Each opens the table.

Ownership stakes6 in 12 mo 8-K events7 in 90 days PatentsNone on record Short interestFINRA · updated Oct 15 Planned insider salesForm 144 · 27 in 12 mo Executive payNone on record Wikipedia attentionNone on record SEC enforcementNone on record Pending deal1 deal filed lately IPO history3 registrations Ownership stakes…8-K events…Patents…Short interest…Planned insider sales…Executive pay…Wikipedia attention…SEC enforcement…

About the company

The basics from the company’s SEC registration.

Legal name: ASP Isotopes Inc.
Address: 2200 ROSS AVENUE, SUITE 4575E, DALLAS, TX 75201
Phone: 202-756-2245
Fiscal year ends: Dec 31
Filer category: emerging growth company
Incorporated in: DE
Listed as: ASPI (Nasdaq)
SEC filings: All filings on SEC EDGAR ↗

About the company

The basics from the company’s SEC registration.

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$1.74−$0.13 (−6.95%) Nov 13 close

1M3M1Y

Oct 13, 2026Low $1.72 · High $2.28Nov 13, 2026

Aug 13, 2026Low $1.72 · High $4.28Nov 13, 2026

Nov 13, 2025Low $1.72 · High $8.48Nov 13, 2026

Congress purchase Congress sale Insider sale over $1M

Adjusted for stock splits; not for dividends. Where prices come from.

Live chart

Intraday and historical prices from TradingView. Quotes may be delayed.

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Information, not investment advice. Company matching is automatic; check the source before relying on one row.