IN THE COURT OF CHANCERY OF THE STATE OF DELAWARE

SUMMARY NOTICE OF PENDENCY AND PROPOSED

SETTLEMENT OF STOCKHOLDER CLASS ACTION,

SETTLEMENT HEARING, AND RIGHT TO APPEAR

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

YOU ARE HEREBY NOTIFIED, pursuant to an Order of the Court of Chancery of the State of Delaware (the “Court”), that the above-captioned stockholder class action (the “Action”) is pending in the Court.

YOU ARE ALSO NOTIFIED that plaintiff Frank Funds (“Plaintiff”), on behalf of itself and the Class, defendants Apollo Global Management, Inc., Apollo Management Holdings GP, LLC, Euro VI (BC) S.A.R.L., John G. Boss, Samuel Feinstein, Robert Kalsow-Ramos, Scott M. Kleinman, Jeffrey M. Nodland, and Marvin O. Schlanger (“Defendants”), and MPM (together with Plaintiff and Defendants, the “Settling Parties”) have reached a proposed settlement for $19,000,000 in cash (the “Settlement”). The terms of the Settlement are stated in the Stipulation and Agreement of Settlement, Compromise, and Release entered into by the Settling Parties, dated November 17, 2023 (the “Stipulation”), a copy of which is available at www.MPMHoldingsStockholderLitigation.com. The proposed Settlement, if approved, will resolve the Class Claims asserted in the Action, and the Class Claims will be dismissed with prejudice.

A hearing (the “Settlement Hearing”) will be held on February 23, 2024 at 11:00 a.m., before The Honorable Nathan A. Cook, Vice Chancellor, in person at the Court of Chancery of the State of Delaware, New Castle County, Leonard L. Williams Justice Center, 500 North King Street, Wilmington, Delaware 19801, to, among other things: (i) determine whether the Action may be finally maintained as a non-opt-out class action and whether the Class should be finally certified, for purposes of the Settlement, pursuant to Court of Chancery Rules 23(a), 23(b)(1), and 23(b)(2); (ii) determine whether Plaintiff may be finally appointed as representative for the Class and Plaintiff’s Counsel, Labaton Sucharow LLP and Anderson Sleater Sianni LLC, may be finally appointed as counsel for the Class, and whether Plaintiff and Plaintiff’s Counsel have adequately represented the interests of the Class in the Action; (iii) determine whether the proposed Settlement on the terms and conditions provided for in the Stipulation is fair, reasonable, and adequate to the Class, and should be approved by the Court; (iv) determine whether a Judgment, substantially in the form attached as Exhibit D to the Stipulation, should be entered dismissing the Class Claims asserted in the Action with prejudice; (v) determine whether the proposed Plan of Allocation of the Net Settlement Fund is fair and reasonable, and should therefore be approved; (vi) determine whether the application by Plaintiff’s Counsel for an award of attorneys’ fees and litigation expenses should be approved; (vii) hear and rule on any objections to the Settlement, the proposed Plan of Allocation, and/or to the application by Plaintiff’s Counsel for an award of attorneys’ fees and expenses; and (viii) consider any other matters that may properly be brought before the Court in connection with the Settlement. Any updates regarding the Settlement Hearing, including any changes to the date or time of the hearing or updates regarding in-person or remote appearances at the hearing, will be posted to the Settlement website, www.MPMHoldingsStockholderLitigation.com.

If you are a member of the Class, your rights will be affected by the pending Action and the Settlement, and you may be entitled to share in the Net Settlement Fund. If you have not yet received the Notice, you may obtain a copy of the Notice by contacting A.B. Data, Ltd. at (877) 495-0892 or Info@MPMHoldingsStockholderLitigation.com. A copy of the Notice can also be downloaded from the Settlement website, www.MPMHoldingsStockholderLitigation.com.

If the Settlement is approved by the Court and the Effective Date occurs, the Net Settlement Fund will be distributed on a pro rata basis to “Eligible Class Members” in accordance with the proposed Plan of Allocation stated in the Notice or such other plan of allocation as is approved by the Court. Under the proposed Plan of Allocation, “Eligible Class Members” consist of all Class Members who held shares of MPM common stock at the closing of the Merger on May 15, 2019 (the “Closing”) and therefore received or were entitled to receive the Merger Consideration of $32.50 per share for their “Eligible Shares”. Pursuant to the proposed Plan of Allocation, each Eligible Class Member will be eligible to receive a pro rata payment from the Net Settlement Fund equal to the product of (i) the number of Eligible Shares held by the Eligible Class Member and (ii) the “Per-Share Recovery” for the Settlement, which will be determined by dividing the total amount of the Net Settlement Fund by the total number of Eligible Shares. As explained in further detail in the Notice, pursuant to the Plan of Allocation, payments from the Net Settlement Fund to Eligible Class Members will be made in the same manner in which Eligible Class Members received the Merger Consideration. Eligible Class Members do not have to submit a claim form to receive a payment from the Settlement.

Any objections to the proposed Settlement, the proposed Plan of Allocation, or Plaintiff’s Counsel’s application for an award of attorneys’ fees and expenses in connection with the Settlement must be filed with the Register in Chancery in the Court of Chancery of the State of Delaware and delivered to Plaintiff’s Counsel and Defendants’ Counsel such that they are received no later than February 8, 2024, in accordance with the instructions set forth in the Notice.

Please do not contact the Court or the Office of the Register in Chancery regarding this notice. All questions about this notice, the proposed Settlement, or your eligibility to participate in the Settlement should be directed to the Settlement Administrator or Plaintiff’s Counsel.

Requests for the Notice should be made to the Settlement Administrator:

Info@MPMHoldingsStockholderLitigation.com

Inquiries, other than requests for the Notice, should be made to Plaintiff’s Counsel:

Ned Weinberger

Labaton Sucharow LLP

222 Delaware Ave., Suite 1510

Wilmington, DE 19801

(866) 640-7254

DelawareSettlements@labaton.com

BY ORDER OF THE COURT OF

CHANCERY OF THE STATE OF DELAWARE

¹ Certain persons and entities are excluded from the Class by definition, as set forth in the full Notice of Pendency and Proposed Settlement of Stockholder Class Action, Settlement Hearing, and Right to Appear (the “Notice”). Any capitalized terms used in this Summary Notice that are not otherwise defined in this Summary Notice shall have the meanings given to them in the Notice or the Stipulation, both of which are available at www.MPMHoldingsStockholderLitigation.com.

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