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ASP Isotopes Inc.

ASPI
Exchange
Nasdaq
Industry
Miscellaneous Chemical Products
SEC CIK
0001921865

In the last 90 days, ASP Isotopes Inc. insiders filed 0 open-market purchases and 8 sales; 185 institutions reported holding it in 13F filings for Q2 2026, worth $406.1M in total; no superinvestor holds it.

Open-market trades, last 90 days

Open-market purchases (P) and sales (S) by ASP Isotopes Inc. insiders, counted by Form 4 filing. Trades with a flagged price and duplicate filings are left out.

Open-market buys
0 filings
Open-market sells
8 filings
6 insiders, $2.79M in total
Insiders trading
6
Net value
−$2.79M
Purchases minus sales

Insider roster

Directors, officers and 10% owners who have filed a Form 4 for ASP Isotopes Inc., current and former, most recent filer first. Last reported holding is the position after the last non-derivative trade in their latest filing.

Insider roster for ASP Isotopes Inc.
NameTitleLast reported holdingLast filingFilings, past year
Ainscow RobertCOO2,248,441Sep 10, 202611
Ainscow Donald GeorgeEVP, Gen Counsel, Secretary776,322Sep 4, 20264
Mann Paul ElliotChairman and CEO9,328,570Sep 4, 20265
Kiessling HeatherChief Financial Officer1,526,252Jul 2, 20264
Wider ToddDirector672,247Jul 1, 20264
Gorley MichaelDirector87,908Jul 1, 20263
Moore DuncanDirector1,044,928Apr 17, 20261
Ryan Robert John AndrewDirector652,222Dec 22, 20251
Hunter Ralph L. JRDirector47,018Dec 22, 20252
AK Jensen Investment Management Ltd10% Owner6,746,874IndirectOct 16, 20240
Donfeld Joshua JayDirector1,104,167Oct 30, 20230
Vasnetsov SergeyDirector3,838,607IndirectMar 8, 20230
Strydom HendrikDirector, 10% Owner3,797,423IndirectNov 16, 20220

Insider trades

Each row adds up one type of transaction in one Form 4 filing. Only open-market purchases (P) and sales (S) are shown by default; use the filters to see grants, option exercises and other codes.

Insider trades
Filed (ET)Trade dateFiling delayInsiderTransactionSharesAvg priceValueHolding changeFlags
Sep 10, 2026 (view filing)9:45 PM ETSep 82 daysAinscow RobertCOOSSale−8.44K$4.29−$36.2K−0.4%2.25M after10b5-1
Sep 4, 2026 (view filing)9:33 PM ETSep 22 daysAinscow Donald GeorgeEVP, Gen Counsel, SecretarySSale−23.7K$3.89−$92.1K−3.0%776.3K after
Sep 4, 2026 (view filing)9:32 PM ETSep 22 daysAinscow RobertCOOSSale−25.0K$3.91−$97.6K−1.1%2.26M after10b5-1
Sep 4, 2026 (view filing)9:30 PM ETSep 2-42 daysMann Paul ElliotChairman and CEOSSale−251.3K$3.98−$999.2K−2.6%9.33M after3 lots10b5-1
Jul 2, 2026 (view filing)9:45 PM ETJul 11 dayKiessling HeatherChief Financial OfficerSSale−23.1K$6.28−$145.2K−1.5%1.53M after10b5-1
Jul 2, 2026 (view filing)9:45 PM ETJun 302 daysAinscow Donald GeorgeEVP, Gen Counsel, SecretarySSale−100.0K$6.14−$614.0K−11.1%800.0K after
Jul 1, 2026 (view filing)9:45 PM ETJun 29-302 daysWider ToddDirectorSSale−100.0K$6.19−$618.5K−12.9%672.2K after2 lots
Jul 1, 2026 (view filing)9:45 PM ETJun 301 dayGorley MichaelDirectorSSale−30.0K$6.27−$188.1K−25.4%87.9K after
Jun 10, 2026 (view filing)Jun 82 daysAinscow RobertCOOSSale−8.44K$7.00−$59.1K−0.4%2.28M after10b5-1
Jun 3, 2026 (view filing)Jun 1-32 daysMann Paul ElliotChairman and CEOSSale−251.3K$7.98−$2.00M−2.6%9.58M after3 lots10b5-1
Apr 17, 2026 (view filing)Apr 161 dayAinscow RobertCOOSSale−22.5K$5.21−$117.2K−1.5%1.49M after10b5-1
Apr 17, 2026 (view filing)Apr 152 daysKiessling HeatherChief Financial OfficerSSale−23.1K$5.48−$126.7K−3.2%709.4K after10b5-1
Apr 17, 2026 (view filing)Apr 161 dayMoore DuncanDirectorSSale−11.6K$5.21−$60.7K−1.1%1.04M after10b5-1
Apr 13, 2026 (view filing)Mar 638 daysLateAinscow RobertCOOSSale−25.0K$4.51−$112.8K−1.6%1.51M after10b5-1
Mar 6, 2026 (view filing)Mar 6Same dayAinscow RobertCOOSSale−8.44K$5.44−$45.9K−0.5%1.54M after10b5-1
Mar 2, 2026 (view filing)Mar 2Same dayMann Paul ElliotExecutive ChairmanSSale+162.2K$5.44+$882.1K+2.2%7.60M after10b5-1
Dec 29, 2025 (view filing)Dec 1811 daysLateKiessling HeatherChief Financial OfficerSSale−80.0K$5.80−$464.0K−9.8%732.5K after
Dec 11, 2025 (view filing)Dec 83 daysLateAinscow RobertInterim CEO and COOSSale−8.44K$6.20−$52.3K−0.5%1.55M after10b5-1
Dec 3, 2025 (view filing)Dec 12 daysMann Paul ElliotExecutive ChairmanSSale−162.2K$5.75−$932.4K−2.0%7.76M after10b5-1
Nov 28, 2025 (view filing)Nov 253 daysAinscow RobertInterim CEO and COOSSale−25.0K$5.77−$144.3K−1.6%1.55M after10b5-1
Nov 28, 2025 (view filing)Nov 17-2511 daysLateMann Paul ElliotExecutive OfficerSSale−162.5K$6.97−$1.13M−2.0%7.92M after2 lots10b5-1
Nov 19, 2025 (view filing)Nov 172 daysAinscow RobertInterim CEO and COOSSale−67.5K$7.51−$506.9K−4.1%1.58M after10b5-1
Oct 16, 2025 (view filing)Oct 142 daysAinscow RobertInterim CEO and COOSSale−22.5K$13.60−$306.0K−1.3%1.65M after10b5-1
Oct 3, 2025 (view filing)Sep 1518 daysLateWider ToddDirectorSSale−74.1K$8.76−$649.2K−9.4%710.2K after
Oct 2, 2025 (view filing)Sep 302 daysGorley MichaelDirectorSSale−64.0K$9.75−$624.0K−44.0%81.4K after
Sep 10, 2025 (view filing)9:01 PM ETSep 82 daysAinscow RobertChief Operating OfficerSSale−8.44K$8.53−$71.9K−0.6%1.41M after10b5-1
Sep 10, 2025 (view filing)Sep 8-92 daysMann Paul ElliotChief Executive OfficerSSale−162.2K$8.46−$1.37M−2.0%8.08M after2 lots10b5-1
Sep 3, 2025 (view filing)Aug 295 daysMoore DuncanDirectorSSale−75.0K$9.28−$696.0K−7.0%994.6K after
Apr 17, 2025 (view filing)Apr 15-172 daysAinscow RobertChief Operating OfficerSSale−200.0K$5.61−$1.12M−12.3%1.42M after3 lots10b5-1
Apr 17, 2025 (view filing)Apr 15-172 daysMann Paul ElliotChief Executive OfficerSSale−950.0K$5.61−$5.33M−11.5%7.32M after3 lots10b5-1
Aug 5, 2024 (view filing)Aug 14 daysAK Jensen Investment Management Ltd10% OwnerSSaleCommon Stock, par value $0.01 per share ("Common Stock")−31.8K$2.45−$78.0K−0.5%6.65M after
Aug 5, 2024 (view filing)Aug 23 daysAK Jensen Investment Management Ltd10% OwnerSSale−80.0K$2.23−$178.4K−1.2%6.57M after
Jul 15, 2024 (view filing)Jul 15Same dayAinscow RobertChief Operating OfficerPPurchase+20.0K––+2.2%920.0K after
Jul 15, 2024 (view filing)Jul 15Same dayMann Paul ElliotChief Executive OfficerPPurchase+40.0K––+0.7%5.85M after
Jul 10, 2024 (view filing)Jul 82 daysAK Jensen Investment Management Ltd10% OwnerPPurchaseCommon Stock, par value $0.01 per share ("Common Stock")+70.0K$3.05+$213.5K+1.1%6.59M after
Jul 10, 2024 (view filing)Jul 9-101 dayAK Jensen Investment Management Ltd10% OwnerPPurchase+91.8K$3.29+$301.8K+1.4%6.68M after2 lots
May 1, 2024 (view filing)Apr 29-302 daysRyan Robert John AndrewDirectorPPurchase+20.5K$3.38+$69.5K+3.7%572.1K after4 lots
Apr 30, 2024 (view filing)Apr 264 daysRyan Robert John AndrewDirectorPPurchase+5.00K$3.48+$17.4K+0.9%551.6K after
Apr 29, 2024 (view filing)Apr 254 daysRyan Robert John AndrewDirectorPPurchase+9.50K$3.42+$32.5K+1.8%546.6K after3 lots
Feb 26, 2024 (view filing)Jan 16-2941 daysLateRyan Robert John AndrewDirectorPPurchase+18.3K$2.29+$42.0K+3.5%537.1K after4 lots
Oct 30, 2023 (view filing)Oct 264 daysMoore DuncanDirectorPPurchase+104.2K$0.96+$100.0K+13.9%854.2K after
Oct 30, 2023 (view filing)Oct 264 daysWider ToddDirectorPPurchase+94.8K$0.96+$91.1K+23.7%494.8K after
Oct 30, 2023 (view filing)Oct 264 daysDonfeld Joshua JayDirectorPPurchase+104.2K$0.96+$100.0K+10.4%1.10M after
Jul 3, 2023 (view filing)Jun 294 daysMoore DuncanDirectorPPurchase+100.0K$0.50+$50.0K+22.2%550.0K after2 lots
May 19, 2023 (view filing)4:05 PM ETMay 181 dayMoore DuncanDirectorPPurchase+20.0K$0.3115+$6.23K+4.7%450.0K after
May 16, 2023 (view filing)May 106 daysLateMoore DuncanDirectorPPurchase+10.0K$0.50+$5.00K+2.4%430.0K after
Apr 11, 2023 (view filing)Apr 65 daysLateMoore DuncanDirectorPPurchase+20.0K$1.00+$20.0K+5.0%420.0K after