Form 8-K

8-K — ASP Isotopes Inc.

Accession: 0001193125-26-215717

Filed: 2026-05-11

Period: 2026-05-11

CIK: 0001921865

SIC: 2890 (MISCELLANEOUS CHEMICAL PRODUCTS)

Item: Regulation FD Disclosure

Item: Financial Statements and Exhibits

Documents

8-K — aspi-20260511.htm (Primary)

EX-99.1 (aspi-ex99_1.htm)

XML — IDEA: XBRL DOCUMENT (R1.htm)

8-K

8-K (Primary)

Filename: aspi-20260511.htm · Sequence: 1

8-K

false000192186500019218652026-05-112026-05-11

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): May 11, 2026

ASP Isotopes Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware

001-41555

87-2618235

(State or Other Jurisdiction

of Incorporation)

(Commission File Number)

(IRS Employer

Identification No.)

2200 Ross Avenue

Suite 4575E

Dallas, Texas

75201

(Address of Principal Executive Offices)

(Zip Code)

Registrant’s Telephone Number, Including Area Code: (214) 432-8219

Not Applicable

(Former Name or Former Address, if Changed Since Last Report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class

Trading

Symbol(s)

Name of each exchange on which registered

Common Stock, par value $0.01

ASPI

The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01 Regulation FD Disclosure.

On May 11, 2026, ASP Isotopes Inc. (the “Company”) issued a press release regarding a memorandum of understanding (MOU) between Quantum Leap Energy LLC and a European nuclear technology company regarding advanced nuclear fuel supply collaboration, which is attached hereto as Exhibit 99.1 and is incorporated by reference herein (the “Press Release”).

The information in this Item 7.01 and in the Press Release shall not be deemed to be “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended, and shall not be incorporated by reference into any filing with the U.S. Securities and Exchange Commission, whether made by the Company before or after the date hereof, regardless of any general incorporation language in such

filing.

The Press Release includes “safe harbor” language pursuant to the Private Securities Litigation Reform Act of 1995, as amended, indicating that certain statements contained therein are “forward-looking” rather than historical.

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits

Exhibit No.

Description

99.1

Press Release dated May 11, 2026.

104

Cover Page Interactive Date File (embedded within the Inline XBRL document)

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ASP ISOTOPES INC.

Date:

May 11, 2026

By:

/s/ Donald G. Ainscow

Name:

Title:

Donald G. Ainscow

Executive Vice President,

General Counsel and Secretary

EX-99.1

Filename: aspi-ex99_1.htm · Sequence: 2

EX-99.1

EXHIBIT 99.1

Quantum Leap Energy Enters into Memorandum of Understanding with European Nuclear Technology Company for Advanced Nuclear Fuel Supply Collaboration

MOU establishes framework for collaboration with the goal to supply HALEU to European advanced reactor developer, beginning 2028

DALLAS, May 11, 2026 -- ASP Isotopes Inc. (NASDAQ: ASPI) (“ASPI”) today announced that Quantum Leap Energy LLC (“we,” "QLE" or the "Company"), a wholly-owned subsidiary of ASPI dedicated to advancing innovative technologies and processes across critical segments of the fission and fusion nuclear fuel cycle, has entered into a non-binding Memorandum of Understanding (MOU) with a European nuclear technology company specializing in advanced nuclear reactor development and other next-generation nuclear energy solutions.

"Securing reliable HALEU supply is one of the most critical challenges facing the advanced nuclear industry today. This MOU is a meaningful step in QLE's mission to build enrichment capabilities that serve both U.S. and global markets. We look forward to working with a partner that shares our conviction that next-generation nuclear energy is essential to a clean and secure energy future," said Dr. Ryno Pretorius, Chief Executive Officer of Quantum Leap Energy.

Under the terms of the MOU, the parties will conduct a technical and economic assessment to determine the viability of a long-term collaboration for the supply of high assay low enriched uranium (HALEU) with uranium-235 content of greater than 10%. The MOU outlines a potential framework where the European partner would agree to provide uranium feedstocks to QLE's planned conversion and enrichment facilities, and QLE would agree to enrich such feedstocks to produce HALEU, including potential deconversion, for delivery to the partner company.

The term of the MOU extends through December 31, 2030, subject to early termination by either party. The scope of the activities contemplated by the MOU includes the parties’ assessment of operational requirements, production scalability for conversion and enrichment, and associated costs and commercial models. The MOU also includes non-binding estimates of quantities of HALEU, with potential deliveries beginning in 2028 and quantities scaling up through 2036, based on the partner's reactor development timeline and anticipated fuel requirements.

The MOU comes amid growing global urgency to establish diverse and reliable HALEU production capabilities. With increasing demand from next-generation reactor developers worldwide and evolving geopolitical dynamics affecting nuclear fuel supply chains, domestic U.S. enrichment capacity capable of serving both domestic and international customers is expected to be critical for the advancement of advanced nuclear energy systems.

About Quantum Leap Energy

Quantum Leap Energy is a development stage nuclear fuels company dedicated to advancing innovative technologies and processes across critical segments of the nuclear fuel cycle. The Company focuses on both front-end activities, including uranium conversion, enrichment of uranium-235 for nuclear fuel production (HALEU, LEU+ and LEU), and isotopic separation of lithium-6 and lithium-7, as well as back-end

EXHIBIT 99.1

radioactive waste treatment technologies. Through exclusive global rights to proprietary Aerodynamic Separation Process (ASP) and laser-based Quantum Enrichment (QE) technologies, Quantum Leap Energy aims to address perceived gaps in the nuclear fuel supply chain for advanced nuclear reactors, small modular reactors, and fusion systems. The Company has established strategic partnerships or commercial initiatives and relationships with industry leaders including TerraPower, Fermi America, and the South Africa Nuclear Energy Corporation (Necsa) to accelerate the commercialization of critical isotopes essential for next-generation nuclear energy systems. For additional information, please visit: https://www.qleapenergy.com/.

About ASP Isotopes Inc.

ASP Isotopes is an advanced materials company dedicated to the development of a differentiated isotope enrichment platform to strengthen global supply chain access to critical materials used in nuclear medicine, next-generation semiconductors, and nuclear energy. The Company’s proprietary technologies, the Aerodynamic Separation Process (“ASP technology”) and Quantum Enrichment (“QE technology”), are designed to enable the production of isotopes for a range of industrial and advanced technology applications. ASP Isotopes operates isotope enrichment facilities in Pretoria, South Africa, focused on the enrichment of low atomic mass elements, or light isotopes. For more information, please visit www.aspisotopes.com.

Forward-Looking Statements

Statements contained herein relating to future plans, results, performance, expectations, achievements and the like are considered "forward-looking statements" within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements include, but are not limited to, the planned collaboration with a European nuclear technology company regarding QLE’s planned uranium conversion, enrichment of uranium-235 for nuclear fuel production, and uranium deconversion services, the expected need or desire for HALEU by third parties, projections about the future nuclear fuel cycle for advanced nuclear reactors and fusion systems, the commencement of research, development and production activities, the future of the company's enrichment technologies as applied to uranium enrichment, QLE's anticipated growth strategies and anticipated trends in QLE's business, statements relating to QLE's strategic partnerships or commercial initiatives and relationships with international partners, statements related to the anticipated benefits to QLE and the collaboration resulting from the MOU discussed herein, and statements we make regarding expected operating results, such as future revenues and prospects from the potential commercialization of isotopes, future performance under contracts, and our strategies for product development, engaging with potential customers, market position, and financial results. These forward-looking statements involve known and unknown risks, uncertainties, and other factors, many of which may be beyond QLE's or ASPI's control, that may cause actual results to differ materially from any future results, performance or achievements expressed or implied by any forward-looking statements. Therefore, you should not rely on any of these forward-looking statements. There are many important factors that could cause QLE’s actual results and financial condition to differ materially from those indicated in the forward-looking statements, including, but not limited to: the potential impact of laws or government regulations or policies in South Africa, the United Kingdom or elsewhere; the outcomes of various strategies and projects undertaken by the Company, including the Company's initiative to commence enrichment of uranium in South Africa and the Company's discussions with nuclear regulators in South Africa and the United Kingdom; whether we succeed in obtaining permissions and regulatory approvals required to test and develop enrichment technologies on uranium in South Africa, the United Kingdom or elsewhere; whether a market for HALEU

EXHIBIT 99.1

is established; technological changes that could render our enrichment technologies uncompetitive or obsolete; our future capital requirements and sources and uses of cash; our ability to obtain funding for our operations and future growth; our reliance on the efforts of third parties; our ability to obtain permissions and regulatory approvals for the production and sale of enriched uranium; the financial terms of any current and future commercial arrangements; our ability to complete certain transactions and realize anticipated benefits from acquisitions and contracts; dependence on our intellectual property (IP) rights and certain IP rights of third parties; and the competitive nature of our industry. All forward-looking statements speak only as of the date hereof. QLE and ASPI undertake no obligation to revise or update any forward-looking statements except as may be required by applicable law.

QLE Contact

QLE@icrinc.com

ASPI Contact

IR@ASPIsotopes.com

XML — IDEA: XBRL DOCUMENT

XML

Filename: R1.htm · Sequence: 5

v3.26.1

Document And Entity Information

May 11, 2026

Cover [Abstract]

Document Type

8-K

Amendment Flag

false

Document Period End Date

May 11, 2026

Entity Registrant Name

ASP Isotopes Inc.

Entity Central Index Key

0001921865

Entity Emerging Growth Company

true

Entity File Number

001-41555

Entity Incorporation, State or Country Code

Entity Tax Identification Number

87-2618235

Entity Address, Address Line One

2200 Ross Avenue

Entity Address, Address Line Two

Suite 4575E

Entity Address, City or Town

Dallas

Entity Address, State or Province

Entity Address, Postal Zip Code

75201

City Area Code

(214)

Local Phone Number

432-8219

Entity Information, Former Legal or Registered Name

Not Applicable

Written Communications

false

Soliciting Material

false

Pre-commencement Tender Offer

false

Pre-commencement Issuer Tender Offer

false

Entity Ex Transition Period

false

Title of 12(b) Security

Common Stock, par value $0.01

Trading Symbol

ASPI

Security Exchange Name

NASDAQ

- Definition

Boolean flag that is true when the XBRL content amends previously-filed or accepted submission.

+ References

No definition available.

+ Details

Name:

dei_AmendmentFlag

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Area code of city

+ References

No definition available.

+ Details

Name:

dei_CityAreaCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Cover page.

+ References

No definition available.

+ Details

Name:

dei_CoverAbstract

Namespace Prefix:

dei_

Data Type:

xbrli:stringItemType

Balance Type:

Period Type:

duration

- Definition

For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD.

+ References

No definition available.

+ Details

Name:

dei_DocumentPeriodEndDate

Namespace Prefix:

dei_

Data Type:

xbrli:dateItemType

Balance Type:

Period Type:

duration

- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

+ References

No definition available.

+ Details

Name:

dei_DocumentType

Namespace Prefix:

dei_

Data Type:

dei:submissionTypeItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 1 such as Attn, Building Name, Street Name

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine1

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Address Line 2 such as Street or Suite number

+ References

No definition available.

+ Details

Name:

dei_EntityAddressAddressLine2

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the City or Town

+ References

No definition available.

+ Details

Name:

dei_EntityAddressCityOrTown

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Code for the postal or zip code

+ References

No definition available.

+ Details

Name:

dei_EntityAddressPostalZipCode

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Name of the state or province.

+ References

No definition available.

+ Details

Name:

dei_EntityAddressStateOrProvince

Namespace Prefix:

dei_

Data Type:

dei:stateOrProvinceItemType

Balance Type:

Period Type:

duration

- Definition

A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityCentralIndexKey

Namespace Prefix:

dei_

Data Type:

dei:centralIndexKeyItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if registrant meets the emerging growth company criteria.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityEmergingGrowthCompany

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Indicate if an emerging growth company has elected not to use the extended transition period for complying with any new or revised financial accounting standards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 7A

-Section B

-Subsection 2

+ Details

Name:

dei_EntityExTransitionPeriod

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Commission file number. The field allows up to 17 characters. The prefix may contain 1-3 digits, the sequence number may contain 1-8 digits, the optional suffix may contain 1-4 characters, and the fields are separated with a hyphen.

+ References

No definition available.

+ Details

Name:

dei_EntityFileNumber

Namespace Prefix:

dei_

Data Type:

dei:fileNumberItemType

Balance Type:

Period Type:

duration

- Definition

Two-character EDGAR code representing the state or country of incorporation.

+ References

No definition available.

+ Details

Name:

dei_EntityIncorporationStateCountryCode

Namespace Prefix:

dei_

Data Type:

dei:edgarStateCountryItemType

Balance Type:

Period Type:

duration

- Definition

Former Legal or Registered Name of an entity

+ References

No definition available.

+ Details

Name:

dei_EntityInformationFormerLegalOrRegisteredName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityRegistrantName

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b-2

+ Details

Name:

dei_EntityTaxIdentificationNumber

Namespace Prefix:

dei_

Data Type:

dei:employerIdItemType

Balance Type:

Period Type:

duration

- Definition

Local phone number for entity.

+ References

No definition available.

+ Details

Name:

dei_LocalPhoneNumber

Namespace Prefix:

dei_

Data Type:

xbrli:normalizedStringItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 13e

-Subsection 4c

+ Details

Name:

dei_PreCommencementIssuerTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14d

-Subsection 2b

+ Details

Name:

dei_PreCommencementTenderOffer

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Title of a 12(b) registered security.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection b

+ Details

Name:

dei_Security12bTitle

Namespace Prefix:

dei_

Data Type:

dei:securityTitleItemType

Balance Type:

Period Type:

duration

- Definition

Name of the Exchange on which a security is registered.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 12

-Subsection d1-1

+ Details

Name:

dei_SecurityExchangeName

Namespace Prefix:

dei_

Data Type:

dei:edgarExchangeCodeItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as soliciting material pursuant to Rule 14a-12 under the Exchange Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Exchange Act

-Number 240

-Section 14a

-Subsection 12

+ Details

Name:

dei_SolicitingMaterial

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration

- Definition

Trading symbol of an instrument as listed on an exchange.

+ References

No definition available.

+ Details

Name:

dei_TradingSymbol

Namespace Prefix:

dei_

Data Type:

dei:tradingSymbolItemType

Balance Type:

Period Type:

duration

- Definition

Boolean flag that is true when the Form 8-K filing is intended to satisfy the filing obligation of the registrant as written communications pursuant to Rule 425 under the Securities Act.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Securities Act

-Number 230

-Section 425

+ Details

Name:

dei_WrittenCommunications

Namespace Prefix:

dei_

Data Type:

xbrli:booleanItemType

Balance Type:

Period Type:

duration