COSTA MESA, Calif., Sept. 17, 2026 /PRNewswire/ — The following statement is being issued by Simpluris, Inc., court-appointed settlement administrator, regarding Mark Leone v. ASP Isotopes Inc., et al., Case No. 1:24-cv-9253-CM.

UNITED STATES DISTRICT COURT
SOUTHERN DISTRICT OF NEW YORK

SUMMARY NOTICE OF (I) PENDENCY OF CLASS ACTION AND
PROPOSED SETTLEMENT; (II) SETTLEMENT FAIRNESS HEARING;
AND (III) MOTION FOR AN AWARD OF ATTORNEYS’ FEES
AND REIMBURSEMENT OF LITIGATION EXPENSES

TO: All persons and entities who purchased the publicly traded common stock of ASP Isotopes Inc. (“ASPI”) between September 26, 2024 and November 26, 2024, both dates inclusive, and who were allegedly damaged thereby as alleged in the Action (the “Settlement Class”):¹

PLEASE READ THIS NOTICE CAREFULLY, YOUR RIGHTS WILL BE AFFECTED BY A CLASS ACTION LAWSUIT PENDING IN THIS COURT.

YOU ARE HEREBY NOTIFIED, pursuant to Rule 23 of the Federal Rules of Civil Procedure and an Order of the United States District Court for the Southern District of New York, that the above-captioned litigation (the “Action”) has been certified as a class action on behalf of the Settlement Class, except for certain persons and entities who are excluded from the Settlement Class by definition as set forth in the full Notice of (I) Pendency of Class Action, Certification of Settlement Class, and Proposed Settlement; (II) Settlement Fairness Hearing; and (III) Motion for an Award of Attorneys’ Fees and Reimbursement of Litigation Expenses (the “Notice”).

YOU ARE ALSO NOTIFIED that the Lead Plaintiff in the Action has reached a proposed settlement of the Action for $9,350,000 in cash (the “Settlement”), that, if approved, will resolve all claims in the Action.

A hearing will be held on December 15, 2026 at 12:30 p.m., before the Honorable Colleen McMahon at the United States District Court for the Southern District of New York, Daniel Patrick Moynihan United States Courthouse, Courtroom 24A, 500 Pearl St., New York, NY 10007, to determine (i) whether the proposed Settlement should be approved as fair, reasonable, and adequate; (ii) whether the Action should be dismissed with prejudice against Defendants, and the Releases specified and described in the Stipulation (and in the Notice) should be granted; (iii) whether the proposed Plan of Allocation should be approved as fair and reasonable; and (iv) whether Lead Counsel’s application for an award of attorneys’ fees and reimbursement of Litigation Expenses should be approved.

If you are a member of the Settlement Class, your rights will be affected by the pending Action and the Settlement, and you may be entitled to share in the Settlement Fund.  The Notice and Proof of Claim and Release Form (“Claim Form”), can be downloaded from the website maintained by the Claims Administrator, www.ASPIsotopesSecuritiesSettlement.com.  You may also obtain copies of the Notice and Claim Form by contacting the Claims Administrator at ASP Isotopes Securities Litigation, c/o Settlement Administrator, P.O. Box 25199, Santa Ana, CA 92799; by email at info@ASPIsotopesSecuritiesSettlement.com; or toll-free at (833) 360-6782. 

If you are a member of the Settlement Class, in order to be eligible to receive a payment under the proposed Settlement, you must submit a Claim Form postmarked or online no later than December 2, 2026. If you are a Settlement Class Member and do not submit a proper Claim Form, you will not be eligible to share in the distribution of the net proceeds of the Settlement, but you will nevertheless be bound by any judgments or orders entered by the Court in the Action.

If you are a member of the Settlement Class and wish to exclude yourself from the Settlement Class, you must submit a request for exclusion such that it is received no later than November 20, 2026, in accordance with the instructions set forth in the Notice. If you properly exclude yourself from the Settlement Class, you will not be bound by any judgments or orders entered by the Court in the Action and you will not be eligible to share in the proceeds of the Settlement. 

Any objections to the proposed Settlement, the proposed Plan of Allocation, or Lead Counsel’s motion for attorneys’ fees and reimbursement of Litigation Expenses, must be filed with the Court and delivered to Lead Counsel and Defendants’ Counsel such that they are received no later than November 20, 2026, in accordance with the instructions set forth in the Notice.

Please do not contact the Court, the Clerk’s office, ASPI, or its counsel regarding this notice. All questions about this notice, the proposed Settlement, or your eligibility to participate in the Settlement should be directed to Lead Counsel or the Claims Administrator.

Requests for the Notice and Claim Form should be made to:

ASP Isotopes Securities Litigation
c/o Settlement Administrator
P.O. Box 25199
Santa Ana, CA 92799

833-360-6782

info@ASPIsotopesSecuritiesSettlement.com

www.ASPIsotopesSecuritiesSettlement.com

Inquiries, other than requests for the Notice and Claim Form, should be made to Lead Counsel:

GLANCY PRONGAY & MURRAY LLP
Garth Spenser, Esq.
1925 Century Park East, Suite 2100
Los Angeles, CA 90067

(310) 201-9150

info@glancylaw.com

By Order of the Court

[FN-1] All capitalized terms used in this Summary Notice that are not otherwise defined herein have the meanings ascribed to them in the Stipulation and Agreement of Settlement dated July 2, 2026 (the “Stipulation”), which is available at www.ASPIsotopesSecuritiesSettlement.com.

*Note – Source and Media Contact info is available to registered members of the press only.

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SOURCE Simpluris Inc.