ASP Isotopes Securities Class Action Settlement

Investors who purchased ASP Isotopes Inc. (NASDAQ: ASPI) publicly traded common stock between September 26, 2024 and November 26, 2024 may qualify for a pro rata share of a $9,350,000 securities class action settlement. Claims must be submitted online or postmarked and received by December 2, 2026. Before you start the form, check the one detail that decides most claims here: under the Plan of Allocation, a class-period share that was sold before November 26, 2024 has a Recognized Loss Amount of $0.00. The shares had to be held through November 26 or November 27, 2024 — the two alleged corrective disclosure dates — to be worth anything, so an investor who bought and sold entirely inside the class window before the 26th is in the class, is bound by the release, and collects nothing. Only common stock counts; ASPI options and warrants are outside the class definition. The widely quoted $0.38 a share is an average before fees and expenses, and the notice's own estimate is that about $0.14 of that goes to the fee and expense request, leaving roughly $0.24. Nothing is distributed to a claimant whose calculated share comes to less than $10.00. Brokerage records are required for every transaction you report; there is no document-free route. The Court has not yet granted final approval and no payment date has been announced.

Do I Qualify?

You may be eligible if:

• You may qualify if you purchased the publicly traded common stock of ASP Isotopes Inc. (NASDAQ: ASPI) between September 26, 2024 and November 26, 2024, both dates inclusive, and were allegedly damaged as a result. ASPI common stock traded on the Nasdaq Capital Market throughout the Settlement Class Period. Qualifying for the Settlement Class is not the same as having a payable claim, and in this settlement the gap is wide enough that most casual searchers should check it first. The Plan of Allocation compensates losses caused by two alleged corrective disclosures, on November 26, 2024 and November 27, 2024. To have any Recognized Loss Amount, ASPI common stock must have been purchased during the Settlement Class Period and held through at least one of those dates. The notice is explicit that for each class-period share sold before November 26, 2024, the Recognized Loss Amount is $0.00. Since the class period itself ends on November 26, 2024, an investor who bought in October 2024 and sold in mid-November 2024 — even at a genuine loss — is a Settlement Class Member, is bound by the release, and recovers nothing. Only ASPI common stock is covered. The Settlement Class is defined by purchases of publicly traded common stock, and the Plan of Allocation assigns Recognized Loss Amounts only to shares. ASPI options, warrants and other securities fall outside it. Exposure through a mutual fund or ETF does not make you a class member either; the purchase had to be in your own account. Timing at the edges matters too. Shares you already held before September 26, 2024 are not eligible, and purchases made after November 26, 2024 are not eligible. The claim form still asks about beginning holdings and about transactions through February 24, 2025, because the administrator matches purchases and sales first-in, first-out and applies the statutory PSLRA 90-day look-back, which caps recognized losses against the $5.20 average closing price over that window. Reporting those non-eligible positions is part of a complete claim, not a sign that they pay. Excluded from the Settlement Class are the Defendants — ASP Isotopes Inc. and chief executive officer Paul E. Mann — the officers and directors of ASPI at all relevant times, members of their immediate families and their legal representatives, heirs, successors or assigns, any entity in which Defendants have or had a controlling interest, any trust of which Mr. Mann is the settlor or which benefits him or his immediate family, and anyone who submits a valid request for exclusion by November 20, 2026. Claims against Heather Kiessling were dismissed by the Court on December 4, 2025 and she is not a Defendant in the settled action. Finally, a valid claim can still pay nothing: the Net Settlement Fund is allocated only among Authorized Claimants whose Distribution Amount calculates to $10.00 or greater. Receiving a postcard notice does not mean you are a Settlement Class Member or that you will be paid.

Documentation is mandatory for every transaction and every holding you report, and it is the most common reason securities claims are delayed or rejected. The completed Claim Form must include adequate supporting documentation — brokerage confirmation slips, monthly brokerage account statements, or an authorized statement from your broker containing the same transactional and holding information — and must be submitted online or postmarked and received no later than December 2, 2026. Neither the parties nor the Claims Administrator has access to your trading records, which is why your own broker paperwork gates the claim. If you no longer have those records, request copies from your broker before the deadline. The claim form does not require a notice ID or claim number from a mailed postcard, so an investor who never received a notice can still file, but that does not lower the documentation bar; a valid email address is also required. You report positions as well as trades. List every ASPI purchase and sale the form asks about, chronologically, including trades that made money and including transactions outside the eligible September 26 through November 26, 2024 window — the administrator needs them to run first-in, first-out matching and the PSLRA 90-day look-back through February 24, 2025. Omitting transactions can get a claim found deficient or rejected. Mechanical points worth getting right: identify the beneficial owner of the shares rather than the street name in which they were held, do not send original documents, keep a copy of everything you submit along with the confirmation the website issues, and retain all records of your ownership of ASPI common stock. Non-U.S. claimants may need the additional forms listed on the claim form. Questions go to the Claims Administrator at info@ASPIsotopesSecuritiesSettlement.com or (833) 360-6782.

What Happened?

On December 4, 2024, a securities class action was filed in the U.S. District Court for the Southern District of New York, styled Corredor v. ASP Isotopes Inc., Case No. 1:24-cv-09253, and later captioned Leone v. ASP Isotopes Inc. after the Court appointed Mark Leone as Lead Plaintiff by order dated May 2, 2025 and approved Glancy Prongay & Murray LLP — now Glancy Prongay Wolke & Rotter LLP — as Lead Counsel. The Amended Class Action Complaint, filed May 28, 2025, asserted claims against ASP Isotopes Inc. and chief executive officer Paul Mann under Section 10(b) of the Securities Exchange Act of 1934 and Rule 10b-5, and against Mr. Mann under Section 20(a). It alleged that Defendants materially misled investors about the stage of development and commercial readiness of ASPI's quantum enrichment technology as applied to the enrichment of uranium, that ASPI common stock traded at artificially inflated prices during the class period as a result, and that the price fell when the alleged truth reached the market on November 26 and November 27, 2024. The case was litigated rather than settled early. Defendants moved to dismiss on June 27, 2025, the same day Lead Plaintiff moved for class certification, and both motions were fully briefed through August 2025. In an Order and Opinion dated December 4, 2025, reported at Leone v. ASP Isotopes Inc., 811 F.Supp.3d 563 (S.D.N.Y. 2025), the Court granted in part and denied in part the motion to dismiss, granted class certification, dismissed all claims against Heather Kiessling, and appointed Lead Plaintiff as Class Representative. Discovery followed: Defendants produced 4,979 documents totaling roughly 31,595 pages between February 17 and March 30, 2026, non-parties TerraPower LLC, Canaccord Genuity LLC and Equiniti Trust Company LLC produced documents under subpoena, and a discovery dispute over documents from ASPI's South African email domain was referred to Magistrate Judge Jennifer E. Willis in March 2026. On March 31, 2026 the parties held a full-day in-person mediation with David M. Murphy of Phillips ADR. That session ended without agreement, but Mr. Murphy continued working with the parties and made a double-blind mediator's recommendation to resolve the action for $9,350,000 in cash. Both sides accepted, and on April 3, 2026 they notified the Court of an agreement in principle. A confidential term sheet followed on April 15, 2026, and the Stipulation and Agreement of Settlement was dated July 2, 2026. Lead Plaintiff moved for preliminary approval on July 7, 2026, the Court granted it on July 9, 2026, and the Settlement Hearing is set for December 15, 2026 at 12:30 p.m. before Judge Colleen McMahon. Defendants deny all allegations of wrongdoing and liability and entered the settlement solely to eliminate the uncertainty, burden and expense of further protracted litigation. No court has ruled that the statements were in fact misleading, and no final approval order has been entered.

How to File Your Claim

1. File the Claim Form on the official settlement website, www.ASPIsotopesSecuritiesSettlement.com, run by court-appointed Claims Administrator Simpluris under the Court's direction
2. the site also carries the Long-Form Notice, the Stipulation and Agreement of Settlement dated July 2, 2026, the Plan of Allocation tables, the Amended Complaint and the Court's order on the motion to dismiss and class certification. Filing is free and does not require hiring a lawyer. The completed Claim Form and its supporting documentation must be submitted online or postmarked and received no later than December 2, 2026. The claim form does not ask for a notice ID or claim number from a mailed postcard, so an investor who never received a notice can still file, but documentation is mandatory in every case: a valid email address plus brokerage account statements, trade confirmations or an equivalent authorized broker statement covering the ASPI purchases, sales and holdings you report. Pull those records before you start. List every transaction the form asks about, including trades that made money and including positions outside the eligible window, because the administrator needs them to run FIFO matching and the PSLRA 90-day look-back through February 24, 2025. A claim missing transactions or supporting records can be found deficient or rejected. Identify the beneficial owner of the shares rather than the street name, keep the confirmation the site issues, and do not send original documents. Non-U.S. claimants may need the additional forms listed on the claim form. Separate deadlines apply to other options: a written request for exclusion, a written objection, or a notice of intention to appear at the hearing must each be received no later than November 20, 2026, which is twelve days before the claim deadline. A class member who does nothing by that date stays in the class and is bound by the settlement if it is approved.
3. Visit the official claim form: https://www.aspisotopessecuritiessettlement.com/

How Much Will I Actually Get?

Pro rata cash from the $9,350,000 fund — a single payment path, not a set of tiers and not a menu. After taxes and tax expenses, notice and administration costs, Court-awarded litigation expenses and Court-awarded attorneys' fees come out, the remaining Net Settlement Fund is divided among Authorized Claimants in proportion to each claimant's Recognized Claim, which is the sum of the Recognized Loss Amounts for all of that claimant's eligible ASPI shares. THE $0.38 FIGURE IS BEFORE DEDUCTIONS, NOT A CHECK AMOUNT. The notice estimates the average recovery at $0.38 per eligible affected share before any Court-approved fees, expenses and costs, and separately estimates the average cost of the fee and expense application at $0.14 per eligible security — which would leave roughly $0.24 per affected share if the Court grants the application in full. Both numbers are averages computed on the assumption that every eligible investor files, not a per-claimant entitlement. Individual payments run higher or lower depending on when shares were bought, whether and when they were sold, and how many investors ultimately file. THE $305,000 CAP COVERS LITIGATION EXPENSES ONLY, NOT ATTORNEYS' FEES AND NOT THE SETTLEMENT AS A WHOLE. Lead Counsel, Glancy Prongay Wolke & Rotter LLP, will separately ask the Court for attorneys' fees of up to 33 1/3% of the Settlement Fund — on $9,350,000 that is roughly $3,116,000 — and will ask for reimbursement of Litigation Expenses not to exceed $305,000, consisting of up to $290,000 in actual litigation expenses and up to $15,000 to reimburse Lead Plaintiff's own costs. The Court has not ruled on either request. Recognized Loss Amounts turn on the alleged artificial inflation in Table 1 of the notice: $2.66 per share for purchases from September 26, 2024 through November 25, 2024, $0.79 for November 26, 2024, and $0.00 thereafter. Shares sold before November 26, 2024 are $0.00. Shares sold on November 26, 2024 are the lesser of $1.87 or purchase price minus sale price. Shares sold during the 90-day look-back window from November 27, 2024 through February 24, 2025 are the least of the inflation differential, purchase price minus sale price, or purchase price minus the look-back value for the sale date in Table 2. Shares still held at the close on February 24, 2025 are the lesser of the purchase-date inflation or the purchase price minus $5.20, the average closing price over the look-back period. A negative result is set to zero. THE $10.00 FLOOR CAN ZERO OUT A VALID CLAIM. The Net Settlement Fund is allocated only among Authorized Claimants whose Distribution Amount calculates to $10.00 or greater; below that, no distribution is made at all. Working from the notice's own estimated net average of about $0.24 per affected share, a claimant would need on the order of forty or more eligible damaged shares before clearing that floor — a rough estimate, since the actual ratio depends on total Recognized Claims filed. Small positions and short holding periods can fall below the line even when the claim itself is valid. Nothing is paid until the Court grants final approval at the December 15, 2026 hearing, any appeals are resolved, and the administrator finishes reviewing claims. No distribution date has been announced.

Last reviewed: September 26, 2026 | Information verified from court records and official settlement documents.

Frequently Asked Questions