ASP Isotopes
NASDAQ: ASPIDallas, US · Founded 2021 · Delaware corporation
Find your way into ASP Isotopes
31 people in our graph share verified history with the ASP Isotopes team — schools, employers, funds. One of them is your warm intro.
Mark Susterunlockedknows Heather Kiessling · together at University of California, San Diego (overlapped)
×11knows the team · via University of California, San Diego
ASP (ASP Isotopes) is an advanced materials company developing proprietary technology and processes to produce and enrich isotopes for markets including nuclear medicine and therapeutics, green energy generation, and quantum computing. Its initial focus is constructing plants in South Africa to produce highly enriched isotopes for the nuclear medicine market.
Founders & leadership
ASP Isotopes was founded in 2021 by Paul E. Mann and Paul Mann.
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Paul E. ManninFounder, Executive Chairman and Chief Executive Officer
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Paul ManninFounder, Executive Chairman and Chief Executive Officer
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Heather KiesslinginChief Financial OfficerHeather Kiessling is an executive officer at ASP Isotopes, an advanced materials company focused on isotope production and enrichment. She has held operational and finance leadership roles across medical equipment and pharmaceutical companies, with expertise in financial planning, manufacturing operations, and cross-functional team management.
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Robert AinscowinExecutive
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Donald AinscowinEVP, General Counsel and Secretary
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Hendrik StrydominExecutiveHendrik Strydom holds a PhD in Physics from the University of Natal and has spent over three decades in isotope separation and advanced materials research, including roles at South Africa's CSIR and Atomic Energy Corporation where he led the development of molecular laser isotope separation (MLIS) technology for uranium enrichment, and subsequently co-founded Klydon to advance enrichment and gas separation technologies.
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Sergey VasnetsovNamed on SEC filing
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Joshua DonfeldNamed on SEC filing
Board
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Michael GorleyBoard director
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Ralph L. Hunter, Jr.Board director
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Sipho N. MasekoBoard director
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Duncan MooreBoard director
Reported raises · per SEC filings
Form D private placements$114.2M disclosed across 2 rounds · 2023–2026
▶$109.2MraisedJul 2026 · 11 investors · OtherRule 506(b)
▶$109.2MraisedJul 2026 · 11 investors · Other
Rule 506(b)Officers, directors & promoters on the filing
- Paul E. MannExecutive Officer, Director
- Michael GorleyDirector
- Ralph L. Hunter, Jr.Director
- Sipho N. MasekoDirector
- Duncan MooreDirector
- Robert RyanDirector
- Todd WiderDirector
- Heather KiesslingExecutive Officer
- Robert AinscowExecutive Officer
- Donald AinscowExecutive Officer
- Offering amount
- $109.2M
- Amount sold
- $109.2M
- First sale
- Jul 2026
- Incorporated
- Corporation, Delaware, 2021
- Federal exemptions
- 06b
▶$5MraisedMar 2023 · 1 investors · OtherRule 506(b)
▶$5MraisedMar 2023 · 1 investors · Other
Rule 506(b)Officers, directors & promoters on the filing
- Robert AinscowExecutive Officer
- Sergey VasnetsovDirector
- Todd WiderDirector
- Hendrik StrydomDirector
- Joshua DonfeldDirector
- Duncan MooreDirector
- Paul E MannExecutive Officer, Director
- Offering amount
- $5M
- Amount sold
- $5M
- Minimum investment
- $5M
- Sales commissions
- $400K
- Proceeds to insiders
- $4.5M
- Placement agents
- H.C. Wainwright & Co., LLC
- First sale
- Mar 2023
- Incorporated
- Corporation, Delaware, 2021
- Federal exemptions
- 06b
Source: SEC EDGAR Form D. Amounts as filed; amended filings shown once at their latest values.
Valuation · disclosed
Disclosed events$125.4Mvaluation at IPONov 2022 · $4.00/share · 424B4
filing ↗Source: SEC prospectus filings, and round valuations the company or its investors disclosed — follow each entry's link for the claim.
Competitors · 6
by search overlap
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In the news
ASP Isotopes (ASPI) Stock Faces Valuation Strain Despite Rapid Revenue Growth - Simply Wall St Newssimplywall.st · Aug 2026
ASP Isotopes posts higher revenue but wider build-out loss | ASPI Quarterly Report (10-Q)stocktitan.net · Aug 2026
ASP Isotopes has filed a notice of an exempt offering of securities to raise $109,181,606.00 in New Funding. - intelligence360intelligence360.news · Aug 2026Frequently asked questions
- What does ASP Isotopes do?
- ASP (ASP Isotopes) is an advanced materials company developing proprietary technology and processes to produce and enrich isotopes for markets including nuclear medicine and therapeutics, green energy generation, and quantum computing. Its initial focus is constructing plants in South Africa to produce highly enriched isotopes for the nuclear medicine market.
- Who founded ASP Isotopes?
- ASP Isotopes was founded by Paul E. Mann, Paul Mann in 2021.
- How much funding has ASP Isotopes raised?
- ASP Isotopes has disclosed $114.2M raised across 2 rounds.
- Where is ASP Isotopes headquartered?
- ASP Isotopes is headquartered in Dallas, US.