ASP Isotopes
ASPI on Nasdaq. ASP Isotopes sells enriched isotopes and natural gas to medical, semiconductor, and energy customers. Market value $369m.
Price checks use the past 12 months to June 2026. Quality checks use five annual reports, the latest for the year to December 2025.
Should I look at this?
Look carefully before going further
Why it could be worth it
Read the warning sign in its own filings
This is not advice. Check the numbers below.
For every $100 of what the whole company costs, it produced $-23.29 of spare cash in the past 12 months. A savings account pays about $4.
The filings do not give us enough to work this out.
The filings do not give us enough to work this out.
Quality score: 40 of 100. Price score: 0 of 100. Our list needs 70 on quality and 60 on price.
$2.85 a share, 14% above its 1-year low
Over the past year the price has ranged from $2.51 to $14.49.
Pays no dividend
Prices from Tuesday’s close (6 October).
Five years of cash, in billions
Spare cash swings from quarter to quarter here: a shortfall of $84 million in the past 12 months, a shortfall of $47 million in the year to December 2025.
| Revenue | ||||
| Revenue | $0 | $433,026 | $4m | $24m |
| Operating margin | ||||
| Operating margin | n/a | -3704.6% | -636.0% | -251.2% |
| Debt to equity | ||||
| Debt to equity | n/a | n/a | 0.06 | 0.07 |
| Shares outstanding | ||||
| Shares outstanding | 0.05bn | 0.07bn | 0.11bn | 0.15bn |
Health checks
- Free cash flow positive0 of 4 years
- Accounting checksSkipped: company is not yet profitable
- Debt0.07× equity
- Revenue growth, five yearsUnknown
- Buying back its own sharesNo, 214% more shares since 2022
The quarter to June 2026
How the business did, compared with the same quarter a year earlier.
- Sales: $5 million last quarter, up 328% on a year ago.
- A loss of $34 million, compared with a loss of $75 million a year ago.
- It loses 321 cents on each $1 of sales, compared with 720 cents a year earlier.
- Over the past 12 months it spent $84 million more cash than it brought in, compared with $30 million a year earlier.
- 68% more shares than a year ago. Each share owns a bit less of the company.
- Sales grew on a year ago in each of the last 4 quarters.
| Quarter to | Amount |
|---|---|
| September 2024 | $1m |
| December 2024 | $1m |
| March 2025 | $1m |
| June 2025 | $1m |
| September 2025 | $5m |
| December 2025 | $17m |
| March 2026 | $4m |
| June 2026 | $5m |
| Quarter to | Amount |
|---|---|
| September 2024 | -$7m |
| December 2024 | -$9m |
| March 2025 | -$8m |
| June 2025 | -$75m |
| September 2025 | -$13m |
| December 2025 | -$63m |
| March 2026 | -$7m |
| June 2026 | -$34m |
From the company's quarterly reports to the SEC.
Dates
- Next results (estimated)
- n/a
- Last annual report (10-K)
- 10 April 2026
- Next quarterly (estimated, 10-Q)
- 13 November 2026
Who owns it
1 long-term investor we follow owns it, unchanged from 1 last quarter. 185 funds in all.
| Fund | Value | Share of that fund | Change |
|---|---|---|---|
| Polen CapitalDan Davidowitz | $930,257 | <0.1% | Added |
Largest holders overall
- BlackRock$57mAdded
- Encompass Capital Advisors$41mCut
- Vanguard Capital Management$31m
- Rovida Investment Management$26m
- UBS Group AG$20mAdded
- Geode Capital Management$18mAdded
- Alyeska Investment Group, L.P.$18mAdded
- State Street$16mAdded
- Exchange Traded Concepts$14mAdded
- AWM Investment Company$10mCut
From 13F filings for the quarter ended 30 June 2026.
Big holders and activists
4 investors own more than 5%.
- Mann Paul ElliotPassive investor7.0%−3.8 ptsSince 31 December 2025
- BlackRock, Inc.Passive investor6.6%+1.1 ptsSince 31 March 2026
- AK Jensen Investment Management LtdPassive investor5.4%−1.2 ptsSince 30 September 2025
- Encompass Capital Advisors LLCPassive investorat least 5.1%(filed with 1 related holder)Since 16 January 2026
- AWM Investment Company, Inc.Passive investorSold down below 5%Since 30 June 2025
- BNP Paribas Asset Management UK LtdPassive investorSold down below 5%Since 31 December 2025
- The Vanguard GroupPassive investorSold down below 5%Since 13 March 2026
| Holder | Stake | Since | |
|---|---|---|---|
Mann Paul Elliot Passive investor | 7.0%−3.8 pts | 31 December 2025 | |
BlackRock, Inc. Passive investor | 6.6%+1.1 pts | 31 March 2026 | |
AK Jensen Investment Management Ltd Passive investor | 5.4%−1.2 pts | 30 September 2025 | |
Encompass Capital Advisors LLC Passive investor | at least 5.1% (filed with 1 related holder) | 16 January 2026 | |
AWM Investment Company, Inc. Passive investor | Sold down below 5% | 30 June 2025 | |
BNP Paribas Asset Management UK Ltd Passive investor | Sold down below 5% | 31 December 2025 | |
The Vanguard Group Passive investor | Sold down below 5% | 13 March 2026 |
From Schedule 13D and 13G filings: anyone owning more than 5% must file one.
What insiders did
In the last 12 months, 1 insider bought $61,800 of shares on the open market. 7 sold $9m, $7m of it under preset trading plans.
- Ryan Robert John AndrewDirectorBought
- Date
- 30 September 2026
- Shares
- 15,000
- Price
- $2.68
- Value
- $40,200
- Ryan Robert John AndrewDirectorBought
- Date
- 28 September 2026
- Shares
- 8,000
- Price
- $2.70
- Value
- $21,600
- Ainscow RobertCOOSoldunder a preset trading plan
- Date
- 8 September 2026
- Shares
- 8,438
- Price
- $4.29
- Value
- $36,216
- Mann Paul ElliotChairman and CEO, DirectorSoldunder a preset trading plan
- Date
- 4 September 2026
- Shares
- 83,759
- Price
- $4.10
- Value
- $343,412
- Mann Paul ElliotChairman and CEO, DirectorSoldunder a preset trading plan
- Date
- 3 September 2026
- Shares
- 83,758
- Price
- $3.92
- Value
- $328,331
- Ainscow Donald GeorgeEVP, Gen Counsel, SecretarySold
- Date
- 2 September 2026
- Shares
- 23,678
- Price
- $3.89
- Value
- $92,107
- Ainscow RobertCOOSoldunder a preset trading plan
- Date
- 2 September 2026
- Shares
- 25,000
- Price
- $3.90
- Value
- $97,625
- Mann Paul ElliotChairman and CEO, DirectorSoldunder a preset trading plan
- Date
- 2 September 2026
- Shares
- 83,758
- Price
- $3.91
- Value
- $327,494
- Kiessling HeatherChief Financial OfficerSoldunder a preset trading plan
- Date
- 1 July 2026
- Shares
- 23,124
- Price
- $6.28
- Value
- $145,219
- Ainscow Donald GeorgeEVP, Gen Counsel, SecretarySold
- Date
- 30 June 2026
- Shares
- 100,000
- Price
- $6.14
- Value
- $614,000
| Date | Who | Did | Shares | Price | Value |
|---|---|---|---|---|---|
| 30 September 2026 | Ryan Robert John Andrew Director | Bought | 15,000 | $2.68 | $40,200 |
| 28 September 2026 | Ryan Robert John Andrew Director | Bought | 8,000 | $2.70 | $21,600 |
| 8 September 2026 | Ainscow Robert COO | Sold under a preset trading plan | 8,438 | $4.29 | $36,216 |
| 4 September 2026 | Mann Paul Elliot Chairman and CEO, Director | Sold under a preset trading plan | 83,759 | $4.10 | $343,412 |
| 3 September 2026 | Mann Paul Elliot Chairman and CEO, Director | Sold under a preset trading plan | 83,758 | $3.92 | $328,331 |
| 2 September 2026 | Ainscow Donald George EVP, Gen Counsel, Secretary | Sold | 23,678 | $3.89 | $92,107 |
| 2 September 2026 | Ainscow Robert COO | Sold under a preset trading plan | 25,000 | $3.90 | $97,625 |
| 2 September 2026 | Mann Paul Elliot Chairman and CEO, Director | Sold under a preset trading plan | 83,758 | $3.91 | $327,494 |
| 1 July 2026 | Kiessling Heather Chief Financial Officer | Sold under a preset trading plan | 23,124 | $6.28 | $145,219 |
| 30 June 2026 | Ainscow Donald George EVP, Gen Counsel, Secretary | Sold | 100,000 | $6.14 | $614,000 |
From Form 4 filings: insiders must report trades in their own company's shares within two days.
Warning signs in its filings
Problems the company itself reported to the SEC, in its own words.
1 serious warning sign in ASP Isotopes’ filings.
We look for five warning signs: doubt it can keep going, weak checks on its own accounts, a notice that its past accounts can't be relied on, a change of auditor, and one customer bringing in a big share of sales. We don't check lawsuits, investigations or debt yet.
We checked the auditor's report, internal controls, restatement notices, auditor changes and big customers in the 10-K filed 10 Apr 2026, plus the 10-Q filed 14 Aug 2026 and 21 later 8-Ks.
Weak checks on its own accounts
SeriousThe company said its checks on its own accounts did not work at the end of its latest quarter. Mistakes could slip into the numbers.
“Based on the evaluation of our disclosure controls and procedures as of June 30, 2026, our Chief Executive Officer and Chief Financial Officer concluded that, as a result of material weaknesses identified in connection with our evaluation of our internal control over financial reporting, as previously disclosed in our Annual Report on Form 10-K (as amended) for the year ended December 31, 2025, our disclosure controls and procedures were not effective as of June 30, 2026.”
Show the full paragraph
Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives, and management necessarily applies its judgement in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of June 30, 2026, our Chief Executive Officer and Chief Financial Officer concluded that, as a result of material weaknesses identified in connection with our evaluation of our internal control over financial reporting, as previously disclosed in our Annual Report on Form 10-K (as amended) for the year ended December 31, 2025, our disclosure controls and procedures were not effective as of June 30, 2026.
From the 10-Q filed 14 August 2026, Part I, Item 4. Controls and Procedures. Read it in the filing
One big customer
Worth knowingOne customer brings in a big share of sales: 32.2% last year. Losing that customer would hurt.
“Revenues from two customers in our construction services segment represent approximately 32.2% ($7.7 million) and 13.7% ($3.3 million), respectively, of our consolidated revenues for the year ended December 31, 2025.”
From the 10-K filed 10 April 2026, Item 7A. Market Risk. Read it in the filing
A 10-K is the yearly report every US company files with the SEC. An 8-K is a short notice of a big event.
What could go wrong
Cheap for a reason is the question the numbers cannot answer.
Whether the price already reflects the risks is what the deep dive is for.
The deep dive
Everything above is arithmetic on public filings. The deep dive reads the last ten years of annual reports, the proxy statements, and the earnings calls, then argues the case the way Buffett, Klarman, and Hohn would, and checks every claim against the source.
- What the business is worth, as a range, and the margin of safety at today’s price
- Prices to start buying, buy, and buy hard
- The three things that would make this a mistake
- Every number footnoted to the filing it came from
Your first deep dive is free.
Not advice. Numbers on this page come from SEC filings and are updated each night; prices are updated again after the US market closes. The five-year figures are rounded.