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ASPI · Asp Isotopes Inc.
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ASPI ASP Isotopes (ASPI) Insider Trading, Ownership & Congress Trades

Materials · Miscellaneous chemical products · CIK 0001921865
Quote by TradingView
Form 144 · 6
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
114
13F, latest reported quarter

What the filings say about ASPI

Insiders, 180 days
-$4.9M net sold
1 buyer · 6 sellers · 35% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$1.3M
6 notices

ASP Isotopes insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, ASP Isotopes Inc. insiders sold a net $4.9M of stock across 71 Form 4 purchases and sales, with 1 insider buying. Source: SEC Form 4 filings, as of 2026-10-27.

Insider
Filed
Shares
Value
Since filing
Kiessling Heather
Chief Financial Officer
SELL
2026-10-21 SECtraded 2026-10-16
21,830
$47.8K
-3.3%
Context
  • 3 earlier Form 4 trades (code P or S) here by this insider (3 sales), the last on Jul 1, 2026.
  • The trade is 1.5% of the 1,504,422 shares held after it.
  • 1 other insider sold within 30 days.
  • 114 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Chief Financial Officer Kiessling Heather sold about $47.8K of ASPI on Oct 16, 2026; 1 other insider sold within 30 days and 114 funds added in the latest 13F quarter.
Ainscow Robert
COO
SELL
2026-10-16 SECtraded 2026-10-14
22,500
$47.6K
-1.7%
Context
  • 14 earlier Form 4 trades (code P or S) here by this insider (14 sales), the last on Sep 8, 2026.
  • The trade is 1.0% of the 2,225,941 shares held after it.
  • 1 other insider sold within 30 days.
  • 114 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: COO Ainscow Robert sold about $47.6K of ASPI under a 10b5-1 plan on Oct 14, 2026; 1 other insider sold within 30 days and 114 funds added in the latest 13F quarter.
Ryan Robert John Andrew
Director
BUY
2026-10-01 SECtraded 2026-09-30
15,000
$40.2K
-30.6%
Context
  • 13 earlier Form 4 trades (code P or S) here by this insider (13 buys), the last on Sep 28, 2026.
  • +8.8% median (+16.7% mean) 90-day return after 8 previous buys.
  • The trade is 2.2% of the 675,222 shares held after it.
  • No other insider bought within 30 days.
  • 114 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Ryan Robert John Andrew bought about $40.2K of ASPI on Sep 30, 2026, the largest insider purchase at the company since 2024; 114 funds added in the latest 13F quarter.
Ryan Robert John Andrew
Director
BUY
2026-09-30 SECtraded 2026-09-28
8,000
$21.6K
-25.2%
Context
  • 12 earlier Form 4 trades (code P or S) here by this insider (12 buys), the last on Apr 30, 2024.
  • +8.8% median (+16.7% mean) 90-day return after 8 previous buys.
  • The trade is 1.2% of the 660,222 shares held after it.
  • No other insider bought within 30 days.
  • 114 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Director Ryan Robert John Andrew bought about $21.6K of ASPI on Sep 28, 2026, the largest insider purchase at the company since 2024; 114 funds added in the latest 13F quarter.
Ainscow Robert
COO
SELL
2026-09-10 SECtraded 2026-09-08
8,438
$36.2K
-39.0%
Context
  • 13 earlier Form 4 trades (code P or S) here by this insider (13 sales), the last on Sep 2, 2026.
  • The trade is 0.4% of the 2,248,441 shares held after it.
  • 2 other insiders sold within 30 days.
  • 114 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: COO Ainscow Robert sold about $36.2K of ASPI under a 10b5-1 plan on Sep 8, 2026; 2 other insiders sold within 30 days and 114 funds added in the latest 13F quarter.
71 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
Showing the latest few. to see 66 more transactions and use the screener and CSV export. We store only your email; there is no password.
Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net -$4.9M over 180 days
-$1.3M over 90 days
below 87% of Materials
Congress
no House purchase disclosed in the last 12 months
Funds
114 funds bought in last quarter
below 51% of Materials
Revenue
+475.5% year over year
more than 98% of Materials
Margin
-670.2% net margin
below 97% of Materials
Buybacks
no share repurchases reported
Short interest
19.9% of the float short (float per yahoo 2026-10-26) · 5.3 days to cover · settled 2026-09-30
more than 97% of Materials
What changed in the last 30 days
Oct 21Chief Financial Officer Kiessling Heather sold $47.8K (Oct 16)
Oct 16Affiliate Heather Kiessling filed to sell $48.0K by Oct 16 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.
Oct 16COO Ainscow Robert sold $47.6K under a 10b5-1 plan (Oct 14)
Why it matters
A 10b5-1 plan schedules trades months ahead, so this says little about what the insider thinks today.
Oct 14OFFICER Ainscow Robert filed to sell $46.6K by Oct 14 (Form 144)
Why it matters
A Form 144 is a notice of intent to sell; the sale may not happen, and it says nothing about the price.
Oct 1Director Ryan Robert John Andrew bought $61.8K (2 trades, Sep 28 to Sep 30)

Watch ASPI

A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.

The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
-77.3%12M
-78%-45%-12%+21%2025-102025-122026-022026-042026-062026-082026-10 2025-12-01 · Mann Paul Elliot sold $932.4K2026-03-02 · Mann Paul Elliot sold $882.1K2025-11-17 · Mann Paul Elliot sold $844.9K2026-06-02 · Mann Paul Elliot sold $694.4K2026-06-01 · Mann Paul Elliot sold $660.0K2026-06-03 · Mann Paul Elliot sold $650.0K2026-06-30 · Ainscow Donald George sold $614.0K2025-11-17 · Ainscow Robert sold $506.9K2025-12-18 · Kiessling Heather sold $464.0K2026-09-04 · Mann Paul Elliot sold $343.4K2026-09-03 · Mann Paul Elliot sold $328.3K2026-09-02 · Mann Paul Elliot sold $327.5K2026-06-29 · Wider Todd sold $312.5K2026-06-30 · Wider Todd sold $306.0K2025-11-25 · Mann Paul Elliot sold $288.5K2026-06-30 · Gorley Michael sold $188.1K2026-07-01 · Kiessling Heather sold $145.2K2025-11-25 · Ainscow Robert sold $144.2K2026-04-15 · Kiessling Heather sold $126.7K2026-04-16 · Ainscow Robert sold $117.2K2026-03-06 · Ainscow Robert sold $112.8K2026-09-02 · Ainscow Robert sold $97.6K2026-09-02 · Ainscow Donald George sold $92.1K2026-04-16 · Moore Duncan sold $60.7K2026-06-08 · Ainscow Robert sold $59.1K2025-12-08 · Ainscow Robert sold $52.3K2026-10-16 · Kiessling Heather sold $47.8K2026-10-14 · Ainscow Robert sold $47.6K2026-03-06 · Ainscow Robert sold $45.9K2026-09-30 · Ryan Robert John Andrew bought $40.2K2026-09-08 · Ainscow Robert sold $36.2K2026-09-28 · Ryan Robert John Andrew bought $21.6K2026-10-16 · Heather Kiessling filed to sell $48.0K2026-10-14 · Ainscow Robert filed to sell $46.6K2026-09-25 · Todd Wider filed to sell $590.0K2026-09-02 · Ainscow Robert filed to sell $94.5K2026-09-02 · Mann Paul Elliot filed to sell $316.6K2026-09-02 · Donald George Ainscow filed to sell $194.4K2026-06-30 · Ainscow Donald George filed to sell $622.0K2026-06-29 · Gorley Michael filed to sell $186.6K2026-06-29 · Todd Wider filed to sell $628.0K
Insider buyInsider sellForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns ASPI: institutional holders (13F)

13F holdings, latest reported quarter
BlackRock, Inc.
9,217,198 sh
$57.3M
Encompass Capital Advisors LLC
6,561,754 sh
$40.8M
VANGUARD CAPITAL MANAGEMENT LLC
4,982,953 sh
$31.0M
EXCHANGE TRADED CONCEPTS, LLC
4,511,018 sh
$28.1M
Rovida Investment Management Ltd
4,100,000 sh
$25.5M

Congress trades in ASPI

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.

ASPI planned insider sales (Form 144)

Notice of intent to sell, filed before any sale
Heather Kiessling
Filed 2026-10-16
$48.0K
Ainscow Robert
Filed 2026-10-14
$46.6K
Todd Wider
Filed 2026-09-25
$590.0K
Ainscow Robert
Filed 2026-09-02
$94.5K
Mann Paul Elliot
Filed 2026-09-02
$316.6K

ASPI mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
Range Nuclear Renaissance Index ETF
$17.6M position · as of 2026-05-31
2.0%
Pacer Data & Infrastructure Real Estate ETF
$3.0M position · as of 2026-07-31
0.8%
Invesco Dorsey Wright Basic Materials Momentum ETF
$540.4K position · as of 2026-07-31
0.7%
American Beacon GLG Natural Resources ETF
$3.4M position · as of 2026-07-31
0.4%
Basic Materials Fund
$74.6K position · as of 2026-06-30
0.2%
iShares Micro-Cap ETF
$2.4M position · as of 2026-06-30
0.2%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $4.9M sold by insiders over 180 days, 114 funds added last quarter, $1.3M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector by SEC SIC code
JELDLEGHWMSAVYSXTENTGREXGEVOCMTKOPNKEBNET

ASPI financials

Revenue growth
+475.5%
XBRL, annual
Net margin
-670.2%
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$30.9M
four quarters, 2025-07-01 to 2026-06-30
Net margin, TTM
-380.3%
net income over revenue, 2025-07-01 to 2026-06-30
Free cash flow, TTM
-$83.6M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Debt to equity
0.23x
long-term 2026-06-30 plus current 2026-06-30; equity 2026-06-30
Cash flow to debt
-1.13x
TTM operating cash flow over long-term 2026-06-30 plus current 2026-06-30
Return on equity
-80.9%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets
-33.1%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on invested capital
n/a
pre-tax loss, no effective tax rate to apply
Return on capital employed
-31.4%
operating income (EBIT proxy) over average of 2025-06-30 and 2026-06-30 minus current liabilities
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Enterprise value
$149.9M
market value at close 2026-10-26 on 2026-08-14 shares, plus long-term 2026-06-30 plus current 2026-06-30, minus cash 2026-06-30
FCF yield
-27.0%
TTM free cash flow over market value at close 2026-10-26
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2025-122024-122023-122022-12
Revenue$23.8M$4.1M$433.0K$0
Gross profit$3.4M$1.6M$139.0K$0
Operating income-$59.9M-$26.4M-$16.0M-$5.1M
Net income-$159.8M-$32.4M-$16.3M-$4.9M
EPS (diluted)-2.11-0.63-0.49n/a
Operating cash flow-$37.8M-$16.7M-$5.4M-$2.9M
Cash$279.6M$61.9M$7.9Mn/a
Long-term debt$1.5M$1.4Mn/an/a
Dividends paid$0$2.8M$0n/a
SEC XBRL, fiscal years, as known on 2026-10-27

ASPI Stock Sonar score 6/7 axes

Find similar shapesCompare

ASPI ranks highest on growth (98th percentile) and institutional and government (49th), and lowest on risk and compliance (3rd), among Materials peers.

ProfitHealthGrowthInsidersInstitutionsRisk
Profitability
10
Inputs
  • Return on equity-80.9% · 7 pct, sector of 100
  • Return on assets-33.1% · 15 pct, sector of 120
  • Return on invested capitalpre-tax loss, no effective tax rate to apply
  • Return on capital employed-31.4% · 7 pct, sector of 96
Financial health
43
Inputs
  • Debt to equity0.23x · 79 pct, sector of 104
  • Cash flow to debt-1.13x · 7 pct, sector of 103
Growth
98
Inputs
  • Revenue growth, YoY+475.5% · 98 pct, sector of 128
  • Backlog growth, YoYno backlog line filed, or no year-earlier backlog
Insider conviction
35
Inputs
  • Net Form 4 buying (codes P and S), 180d-$3.7M · 15 pct, sector of 80
  • Insider buyers, 180d1 · 56 pct, sector of 80
Institutional and government
49
Inputs
  • Funds adding, latest quarter114 · 49 pct, sector of 118
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
3
Inputs
  • Short interest, % of float+19.9% · 1 pct, sector of 143
  • Recalls per $1B revenue, 3yrevenue under $50M or not filed, so a count cannot be scaled to size
  • EPA cases per $1B revenue, 5yrevenue under $50M or not filed, so a count cannot be scaled to size
  • New text in Risk Factors, latest 10-K+50.5% · 4 pct, sector of 111
1 not measured: US patents
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

6 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

ASPI filings, in plain words

Are ASP Isotopes insiders buying or selling ASPI?

In the 180 days to 2026-10-27, ASP Isotopes insiders were net sellers, a net $4.9M: $61.8K of purchases and $4.9M of sales reported on Form 4, by 1 buyer and 6 sellers.

Are there planned insider sales of ASPI?

Yes. 6 Form 144 notices of planned insider sales were filed in the 90 days to 2026-10-27, covering $1.3M of stock; the latest, by Heather Kiessling, was filed 2026-10-16.

Read the full summary

In the 180 days to 2026-10-27, ASP Isotopes insiders were net sellers of ASPI, a net $4.9M across purchases and sales reported on Form 4 by 1 buyer and 6 sellers. Sales outweighed purchases more than tenfold by value. 35% of the 17 insider sales were made under a Rule 10b5-1 plan; the rest were not flagged as planned. Insiders filed 6 Form 144 notices of intent to sell in the 90 days to 2026-10-27, covering $1.3M of stock. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.

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