Encompass discloses 5.13% ASP Isotopes (ASPI) holding in 13G

Rhea-AI Filing Summary

Encompass Capital Advisors LLC filed a Schedule 13G reporting a significant passive ownership stake in ASP Isotopes Inc. common stock. The firm and its managing member, Todd J. Kantor, together report beneficial ownership of 6,413,362 shares, representing 5.13% of ASP Isotopes’ outstanding common stock as of the event date 01/16/2026.

Both Encompass and Kantor report shared voting and dispositive power over all 6,413,362 shares and no sole power to vote or dispose of any shares. They certify that the securities were not acquired and are not held for the purpose or effect of changing or influencing control of ASP Isotopes, indicating a passive investment intent. A joint filing agreement confirms the Schedule 13G is filed on behalf of both reporting persons.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

ASP Isotopes Inc.

(Name of Issuer)

Common Stock, par value $0.01

(Title of Class of Securities)

00218A105

(CUSIP Number)

01/16/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

SCHEDULE 13G

CUSIP No. 00218A105

1

Names of Reporting Persons

Encompass Capital Advisors LLC

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

DELAWARE

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,413,362.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 6,413,362.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,413,362.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.13 %

12

Type of Reporting Person (See Instructions)

IA

SCHEDULE 13G

CUSIP No. 00218A105

1

Names of Reporting Persons

Todd J. Kantor

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

UNITED STATES

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 6,413,362.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 6,413,362.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,413,362.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

5.13 %

12

Type of Reporting Person (See Instructions)

HC, IN

SCHEDULE 13G

Item 1.
(a)	Name of issuer: ASP Isotopes Inc.
(b)	Address of issuer's principal executive offices: 2200 ROSS AVENUE, SUITE 4575E, DALLAS, TX, 75201
Item 2.
(a)	Name of person filing: Encompass Capital Advisors LLC Todd J. Kantor
(b)	Address or principal business office or, if none, residence: Encompass Capital Advisors LLC: 200 Park Avenue, Suite 1604, New York, NY 10166 Todd J. Kantor: c/o Encompass Capital Advisors LLC, 200 Park Avenue, Suite 1604, New York, NY 10166
(c)	Citizenship: Encompass Capital Advisors LLC is a Delaware Limited Liability Company Todd J. Kantor is a US citizen
(d)	Title of class of securities: Common Stock, par value $0.01
(e)	CUSIP No.: 00218A105
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: Encompass Capital Advisors LLC 6,413,362 Todd J. Kantor 6,413,362
(b)	Percent of class: Encompass Capital Advisors LLC 5.13% Todd J. Kantor 5.13%
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: Encompass Capital Advisors LLC 0 Todd J. Kantor 0
	(ii) Shared power to vote or to direct the vote: Encompass Capital Advisors LLC 6,413,362 Todd J. Kantor 6,413,362
	(iii) Sole power to dispose or to direct the disposition of: Encompass Capital Advisors LLC 0 Todd J. Kantor 0
	(iv) Shared power to dispose or to direct the disposition of: Encompass Capital Advisors LLC 6,413,362 Todd J. Kantor 6,413,362
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	Not Applicable
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Encompass Capital Advisors LLC

Signature:	Todd J. Kantor
Name/Title:	Todd J. Kantor | Managing Member
Date:	01/23/2026

Todd J. Kantor

Signature:	Todd J. Kantor
Name/Title:	Todd J. Kantor
Date:	01/23/2026

Exhibit Information

JOINT FILING AGREEMENT The undersigned hereby agree that the statement on SCHEDULE 13G with respect to the shares of Common Stock of ASP Isotopes Inc., dated as of January 23, 2026 is, and any amendments thereto signed by each of the undersigned shall be, filed on behalf of each of us pursuant to and in accordance with the provisions of Rule 13d-1(k) under the Securities Exchange Act of 1934, as amended. Date: January 23, 2026 Encompass Capital Advisors LLC By: Todd J. Kantor Name: Todd J. Kantor Title: Managing Member Todd J. Kantor By: Todd J. Kantor Name: Todd J. Kantor

FAQ

What stake in ASP Isotopes Inc. (ASPI) does Encompass Capital report?

Encompass Capital Advisors LLC reports beneficial ownership of 6,413,362 shares of ASP Isotopes Inc. common stock, representing 5.13% of the class as of 01/16/2026.

Who are the reporting persons in this ASP Isotopes (ASPI) Schedule 13G?

The reporting persons are Encompass Capital Advisors LLC, a Delaware limited liability company, and Todd J. Kantor, a U.S. citizen and Managing Member of Encompass Capital Advisors LLC.

Does Encompass Capital seek control of ASP Isotopes Inc. (ASPI)?

No. The reporting persons certify that the securities were not acquired and are not held for the purpose or effect of changing or influencing the control of ASP Isotopes Inc., and are not held in connection with any transaction having that purpose or effect.

How much voting and dispositive power does Encompass Capital have over ASP Isotopes (ASPI) shares?

Encompass Capital Advisors LLC and Todd J. Kantor each report 0 shares with sole voting or dispositive power and 6,413,362 shares with shared voting and shared dispositive power.

What class of ASP Isotopes (ASPI) securities is covered and what is the CUSIP?

The filing covers Common Stock, par value $0.01 of ASP Isotopes Inc., with CUSIP 00218A105.

Is this ASP Isotopes (ASPI) filing made jointly by Encompass and Todd J. Kantor?

Yes. A joint filing agreement states that the Schedule 13G and any amendments are filed on behalf of both Encompass Capital Advisors LLC and Todd J. Kantor pursuant to Rule 13d-1(k).