BlackRock (ASPI) reports 8.27M shares, 6.6% ownership (Schedule 13G/A)

Rhea-AI Filing Summary

BlackRock, Inc. files an amended Schedule 13G reporting beneficial ownership of 8,274,763 shares of ASP Isotopes Inc. The amendment (Amendment No. 1) lists 8,274,763 shares beneficially owned, representing 6.6% of the class, with 8,117,277 shares of sole voting power and 8,274,763 shares of sole dispositive power. The cover shows a 03/31/2026 reference and the filing is signed on 04/27/2026. The filing states the holdings reflect aggregated positions of Reporting Business Units of BlackRock and notes various persons may have rights to dividends or proceeds but no other single person holds more than 5%.

Insights

Institutional Ownership Analyst

BlackRock reports a 6.6% passive stake in ASP Isotopes.

BlackRock's Schedule 13G/A shows a beneficial ownership position of 8,274,763 shares, equating to 6.6% of outstanding common stock as reported in the filing. The position is presented as aggregated across Reporting Business Units, with sole voting and dispositive power figures disclosed.

The filing uses 13G/A form conventions indicating passive or qualifying institutional ownership rather than an activist intent; subsequent filings would disclose any change in classification or holdings.

Securities Compliance Attorney

Amendment clarifies ownership and power figures; standard disclosures are included.

The amendment provides the required Schedule 13G/A data: amount beneficially owned, percent of class, voting/dispositive powers, and Exhibit cross-references. It includes the signature block and exhibits for Item 7 and a power of attorney.

Disclosure notes that various persons may receive dividends or proceeds; the filing does not identify any single third party owning more than 5%.

Key Figures

Beneficially owned: 8,274,763 shares Percent of class: 6.6% Sole voting power: 8,117,277 shares +3 more

6 metrics

Beneficially owned 8,274,763 shares Amount beneficially owned (Schedule 13G/A)

Percent of class 6.6% Percent of common stock reported in filing

Sole voting power 8,117,277 shares Sole power to vote or direct the vote

Sole dispositive power 8,274,763 shares Sole power to dispose or direct disposition

Cover reference date 03/31/2026 Date shown on cover reference

Filing signature date 04/27/2026 Date signature block signed by Managing Director

Key Terms

beneficially owned, sole dispositive power, Schedule 13G/A, Reporting Business Units

4 terms

beneficially owned regulatory

"reflects the securities beneficially owned, or deemed to be beneficially owned"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole dispositive power regulatory

"Sole power to dispose or to direct the disposition of: 8274763"

Sole dispositive power is the exclusive legal authority to decide what happens to a security — for example, whether to sell, transfer, or retain shares — without needing anyone else’s permission. Investors care because it signals who truly controls the economic outcome of an investment: like holding the only key to a safe, the holder can realize gains or losses and may trigger regulatory reporting, insider rules, or influence over corporate ownership.

Schedule 13G/A regulatory

"Amendment No. 1 ) ASP Isotopes Inc. Common Stock"

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

Reporting Business Units other

"beneficially owned by certain business units (collectively, the "Reporting Business Units")"

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

ASP Isotopes Inc.

(Name of Issuer)

Common Stock

(Title of Class of Securities)

00218A105

(CUSIP Number)

03/31/2026

(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)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 00218A105

1

Names of Reporting Persons

BlackRock, Inc.

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 8,117,277.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 8,274,763.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

8,274,763.00

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)

6.6 %

12

Type of Reporting Person (See Instructions)

HC

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: BlackRock, Inc. In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by certain business units (collectively, the "Reporting Business Units") of BlackRock, Inc. and its subsidiaries and affiliates. It does not include securities, if any, beneficially owned by other business units whose beneficial ownership of securities are disaggregated from that of the Reporting Business Units in accordance with such release.
(b)	Address or principal business office or, if none, residence: BlackRock, Inc., 50 Hudson Yards New York, NY 10001
(c)	Citizenship: See Item 4 of Cover Page
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 00218A105
Item 4.	Ownership
(a)	Amount beneficially owned: 8274763
(b)	Percent of class: 6.6 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 8117277
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 8274763
	(iv) Shared power to dispose or to direct the disposition of: 0
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.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Various persons have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of the common stock of ASP Isotopes Inc.. No one person's interest in the common stock of ASP Isotopes Inc. is more than five percent of the total outstanding common shares.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. See Exhibit 99
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 acquired and are held in the ordinary course of business and 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.

BlackRock, Inc.

Signature:	Spencer Fleming
Name/Title:	Managing Director
Date:	04/27/2026

Exhibit Information

Exhibit 24: Power of Attorney Exhibit 99: Item 7

FAQ

What stake does BlackRock report in ASP Isotopes (ASPI)?

BlackRock reports beneficial ownership of 8,274,763 shares, representing 6.6% of ASP Isotopes' common stock. The filing lists sole voting power of 8,117,277 shares and sole dispositive power of 8,274,763.

What filing did BlackRock submit for ASPI and when was it signed?

BlackRock submitted an amended Schedule 13G (Amendment No. 1) relating to ASP Isotopes. The signing date on the filing is 04/27/2026 and the cover references 03/31/2026.

Does the filing indicate BlackRock has control over ASPI?

The filing shows BlackRock has sole voting power for 8,117,277 shares and sole dispositive power for 8,274,763 shares. It does not claim control beyond those powers disclosed in the Schedule 13G/A.

Are other persons listed as having greater than 5% ownership of ASPI?

No single other person is identified as owning more than 5%. The filing states various persons may have rights to dividends or proceeds, but none holds over 5% of the common stock.

What do the reported voting and dispositive power figures mean?

Sole voting power (8,117,277) means BlackRock can direct votes for that many shares; sole dispositive power (8,274,763) means it can direct sale or transfer. These figures are disclosed exactly as in the filing.