File a Claim Online If you prefer to mail your claim, you can download a copy of the Proof of Claim form from the Important Documents page. Biogen Securities Litigation Claim Form Δ Step 1 of 6 16% CompanyThis field is for validation purposes and should be left unchanged.claim_id This form allows you to file your claim online securely through the Settlement website. If you wish to file a paper claim or review any of the documents related to this case, please click the Notice of Proposed Settlement of Class Action and Proof of Claim and Release link found in the Important Documents section of the case page.Before you beginPlease have the following items ready to go before you begin filing your online claim form; it will make the process easier for you.• You should have copies of your statements for the relevant date ranges so that you can enter your transactions.• You should have copies of these statements scanned and saved on your computer so that you can upload them as proof. We prefer files in PDF format, but we can accept most file formats.Step 1 – General InstructionsPlease read this important information about the case. It provides important details you should understand before you file your claim.Step 2 – Claimant IdentificationPlease enter your current contact information to assist us in identifying your claim and contacting you for additional information and updates. We recommend you turn off auto-fill settings in your browser to ensure incorrect information is not added by mistake. You will receive a confirmation email that we received your claim at the email address you provide. Important: Double-check the information before you click Next, as you will not have the opportunity to review it again prior to submitting.Step 3 – Schedule of TransactionsPlease read the instructions carefully and enter your relevant transactions. You need to ensure that your number of shares in beginning holdings, plus purchases/acquisitions, minus sales, and minus ending holdings equals zero. This is to ensure that all relevant transactions are accounted for. The form will not allow you to continue until all outstanding shares are accounted for.Step 4 – DocumentationPlease drag and drop your files or click Select Files and choose the documents that you will provide as proof of your transactions and holdings. Trade confirmations and monthly statements from your brokerage firm are typically the best documents to use as proof. Once a file upload completes, the file name will appear below the upload box. You may click the trash can icon to remove a file if it was added in error.Step 5 – Release and CertificationPlease read the Release and Certification carefully. By typing your name and date in the fields provided, you are signing the document and certifying that all information submitted is true, correct, and complete. After You Click the Submit Button Within a few minutes of submitting your claim, you will receive a confirmation email containing your Form ID along with the information you submitted. If you need to amend your claim, please reference the Form ID provided. If you do not receive the confirmation email, be sure to check your spam or junk folder. Deadline for Submission: September 24, 2026 PROOF OF CLAIM AND RELEASE I. GENERAL INSTRUCTIONS This Proof of Claim and Release form (“Claim Form”) incorporates by reference the definitions in the Notice of Proposed Settlement of Class Action (the “Notice”) and, unless defined herein, capitalized words and terms shall have the same meanings as they have in the Notice. To recover as a member of the Class based on your claims in the above-captioned Action, you must complete this Claim Form. If you fail to file a properly addressed (as set forth below) Claim Form, your claim may be rejected and you may be precluded from any recovery from the Settlement Fund created in connection with the proposed Settlement of the Action. Submission of this Claim Form, however, does not ensure that you will share in the proceeds of the Settlement. You must submit your completed and signed Claim Form so that it is received (if submitted online) or postmarked (if mailed) no later than September 24, 2026. Mailed submissions should be addressed to the Claims Administrator as follows: Biogen Securities Litigation Settlement c/o Strategic Claims Services P.O. Box 230 600 N. Jackson St., Suite 205 Media, PA 19063 Emailed Submissions: info@strategicclaims.net Online Submissions: www.BiogenSecuritiesLitigation.com A Claim Form shall be deemed to have been submitted when postmarked, if mailed first-class, or by registered or certified mail, postage prepaid. All other Claim Forms shall be deemed to have been submitted at the time they are actually received by the Claims Administrator. If you are NOT a member of the Class, as defined in the Notice, DO NOT submit a Claim Form. If you are a member of the Class, you are bound by the terms of the Stipulation and the Settlement, as well as any Order and Final Judgment (defined below) entered in the Action whether or not you submit a Claim Form. II. CLAIMANT IDENTIFICATION In the section of the Claim Form entitled “Part I – Claimant Identification”, provide the requested information for the beneficial owner(s) and record owners, if applicable, of the Biogen Inc. (“Biogen”) common stock that forms the basis of this claim. If you purchased or otherwise acquired Biogen common stock between June 8, 2021 and July 12, 2021, inclusive (the “Class Period”), and held (or hold) the stock certificate(s) in your name, you are the beneficial owner as well as the record owner. If, however, the stock certificate(s) were or are registered in the name of a third party, such as a nominee or brokerage firm, you are the beneficial owner and the third party is the record owner. Identify each owner of record (“nominee”), if different from the beneficial owner of Biogen common stock who forms the basis of this claim. This claim must be made by the actual beneficial owner or owners, or the legal representative(s) of such owner or owners, of the Biogen common stock upon which this claim is based. All joint beneficial purchasers must sign this claim. Executors, administrators, guardians, conservators, and trustees must complete and sign this claim on behalf of persons and/or entities represented by them and their authority must accompany this claim and their titles or capacities must be stated. The Social Security (or taxpayer identification) number and telephone number of the beneficial owner may be used in verifying the claim. Failure to provide the foregoing information could delay verification of your claim or result in rejection of the claim. III. CLAIM FORM In the section of the Claim Form entitled “Part II – Schedule of Transactions in Biogen Common Stock”, supply all required details of your transaction(s) in Biogen common stock. If you need more space, attach separate sheets giving all of the required information in substantially the same form. Sign and print or type your name on each additional sheet. Please provide all the requested information with respect to allof your purchases, acquisitions, and sales of Biogen common stock, whether such transactions resulted in a profit or loss. Failure to report all such transactions may result in the rejection of your claim. List each transaction separately and in chronological order, by trade date, beginning with the earliest. You must accurately provide the month, day, and year of each transaction you list. You must submit documentation for your trading history. Acceptable documentation may include: (a) monthly stock brokerage or other investment account statements; (b) trade confirmation slips; (c) a signed letter from your broker on firm letterhead containing the transactional and holding information found in a broker confirmation slip or account statement; or (d) other equivalent proof of your transactions. Do not send originals. Broker confirmations or other documentation of your transactions in Biogen common stock should be attached to your Claim Form. Failure to provide this documentation could delay verification of your claim or result in rejection of your claim. THE PARTIES DO NOT HAVE INFORMATION ABOUT YOUR TRANSACTIONS IN BIOGEN COMMON STOCK. The requests are designed to provide the minimum amount of information necessary to process the simplest claims. The Claims Administrator may request additional information as required to efficiently and reliably calculate your losses. In cases where the Claims Administrator cannot perform the calculation accurately or at a reasonable cost to the Class with the information provided, the Claims Administrator may condition acceptance of the claim upon the production of additional information in other Biogen securities, such as derivatives, which may be needed to calculate your Recognized Loss. NOTICE REGARDING INSTITUTIONAL FILERS: Representatives with authority to file on behalf of (a) accounts of multiple Class Members and/or (b) institutional accounts with large numbers of transactions (“Representative Filers”) must submit information regarding their transactions in an electronic spreadsheet format. If you are a Representative Filer, you must contact the Claims Administrator at efile@strategicclaims.net or visit the Settlement website at www.BiogenSecuritiesLitigation.com to obtain the required file layout. Claims which are not submitted in electronic spreadsheet format and in accordance with the Claims Administrator’s instructions may be subject to rejection. All Representative Filers MUST also submit a manually signed Proof of Claim and Release Form, as well as proof of authority to file, along with the electronic spreadsheet format. No claims submitted in electronic spreadsheet format will be considered to have been properly submitted unless the Claims Administrator issues to the claimant a written acknowledgment of receipt and acceptance of electronically submitted data. NOTICE REGARDING ONLINE FILING: Claimants who are not Representative Filers may submit their claims online using the electronic version of the Claim Form hosted on the Settlement website at www.BiogenSecuritiesLitigation.com. If you are not acting as a Representative Filer, you do not need to contact the Claims Administrator prior to filing; you will receive an automated e-mail confirming receipt once your Claim Form has been submitted. If you are unsure if you should submit your claim as a Representative Filer, please contact the Claims Administrator at info@strategicclaims.net or (866) 274-4004. If you are not a Representative Filer, but your claim contains a large number of transactions, the Claims Administrator may request that you also submit an electronic spreadsheet showing your transactions to accompany your Claim Form. CLAIMANT INFORMATIONThe Claims Administrator will use this information for all communications regarding this Claim Form. If this information changes, you MUST notify the Claims Administrator in writing at info@strategicclaims.net. Complete names of all persons and entities must be provided.Beneficial Owner's Name(Required)Co-Beneficial Owner's NameEntity Name(if the Beneficial Owner is not an individual)Representative or Custodian Name(if different from Beneficial Owner(s) listed above)Address(Required) Street Address Address Line 2 City State / Province / Region ZIP / Postal Code AfghanistanÅland IslandsAlbaniaAlgeriaAmerican SamoaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelgiumBelizeBeninBermudaBhutanBoliviaBonaire, Sint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBrunei DarussalamBulgariaBurkina FasoBurundiCabo VerdeCambodiaCameroonCanadaCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos IslandsColombiaComorosCongoCongo, Democratic Republic of theCook IslandsCosta RicaCôte d'IvoireCroatiaCubaCuraçaoCyprusCzechiaDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEswatiniEthiopiaFalkland IslandsFaroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuamGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and McDonald IslandsHoly SeeHondurasHong KongHungaryIcelandIndiaIndonesiaIranIraqIrelandIsle of ManIsraelItalyJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKorea, Democratic People's Republic ofKorea, Republic ofKuwaitKyrgyzstanLao People's Democratic RepublicLatviaLebanonLesothoLiberiaLibyaLiechtensteinLithuaniaLuxembourgMacaoMadagascarMalawiMalaysiaMaldivesMaliMaltaMarshall IslandsMartiniqueMauritaniaMauritiusMayotteMexicoMicronesiaMoldovaMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorth MacedoniaNorthern Mariana IslandsNorwayOmanPakistanPalauPalestine, State ofPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalPuerto RicoQatarRéunionRomaniaRussian FederationRwandaSaint BarthélemySaint Helena, Ascension and Tristan da CunhaSaint Kitts and NevisSaint LuciaSaint MartinSaint Pierre and MiquelonSaint Vincent and the GrenadinesSamoaSan MarinoSao Tome and PrincipeSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSint MaartenSlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia and the South Sandwich IslandsSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwedenSwitzerlandSyria Arab RepublicTaiwanTajikistanTanzania, the United Republic ofThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTürkiyeTurkmenistanTurks and Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited KingdomUnited StatesUruguayUS Minor Outlying IslandsUzbekistanVanuatuVenezuelaViet NamVirgin Islands, BritishVirgin Islands, U.S.Wallis and FutunaWestern SaharaYemenZambiaZimbabwe Country Day PhoneEvening PhoneEmail(Required)By providing this email address, you are authorizing the Claims Administrator to use it in providing you with information relevant to this claim. Enter Email Confirm Email Account InformationLast four digits of Social Security Number (for individuals) or Taxpayer Identification Number (for estates, trusts, corporation, etc.)Account Number / Fund Number (not necessary for individual filers):This field is hidden when viewing the formClaimant Account Type (check appropriate box): Individual (includes joint owner accounts) Corporation IRA/401K Pension Plan Estate Trust Other SCHEDULE OF TRANSACTIONS IN BIOGEN COMMON STOCKHoldings as of June 8, 2021:(Required)AT THE OPEN OF TRADING ON JUNE 8, 2021, HOW MANY SHARES OF BIOGEN COMMON STOCK DID YOU OWN? If none, enter “0” (Must submit documentation.) Purchases from June 8, 2021 through October 12, 2021List each individual purchase or acquisition of Biogen common stock between and including June 8, 2021 and October 12, 2021, as follows (Must submit documentation.) Transaction_TypeDate of Purchase (list chronologically) (Month/Day/Year)Number of Shares of Common Stock Purchased/AcquiredPurchase Price Per Share of Common StockAggregate Cost (excluding commissions, taxes, and fees) Please enter a value greater than or equal to 0. Add RemoveSales from June 8, 2021 through October 12, 2021List each individual sale of Biogen common stock between and including June 8, 2021 and October 12, 2021, as follows: (Must submit documentation.) Transaction_TypeDate of Sale (list chronologically) (Month/Day/Year)Number of Shares of Common Stock SoldSale Price Per Share of Common StockAmount Received (not including commissions, taxes, and fees) Please enter a value greater than or equal to 0. Add RemoveHeld as of October 12, 2021:(Required)At the close of trading on October 12, 2021, how many shares of Biogen common stock did you hold? If none, enter “0” (Must submit documentation.) BALANCE CHECKBelow is a summary of the transactions you entered. Your Purchases/Acquisitions minus Sales and Ending Holdings should equal zero. Please correct any errors below to ensure that all transactions are accounted for.BEGINNING HOLDINGSTOTAL PURCHASESTOTAL SALESENDING HOLDINGSOutstanding SharesThis field shows the number of shares that are outstanding based on what you have entered. When all shares are accounted for, the balance in this field will be zero.Balance Check Error(Required) DocumentationYou are required to attach proof as part of the online filing process. Please attach your files below.Upload Files(Required)If you have a large number of files, please consider uploading a ZIP file. Drop files here or Select files Accepted file types: pdf, jpg, jpeg, png, tiff, zip, xlsx, Max. file size: 80 MB. Acknowledgment(Required)You are required to attach proof as part of the online filing process. You may be ineligible if accurate broker trade confirmations/monthly statements are not provided. I agree to the terms and conditions.CERTIFICATION AND SIGNATURE(Required)SUBMISSION TO JURISDICTION OF COURT, ACKNOWLEDGMENTS, AND RELEASES Please review the following submission to jurisdiction and sign below. I (we) submit this Proof of Claim and Release form under the terms of the Stipulation and Agreement of Class Action Settlement dated as of June 5, 2026 (“Stipulation”), and in connection with the settlement (the “Settlement”) of claims against Defendants Biogen, Michel Vounatsos, and Alisha Alaimo (“Defendants”) contemplated therein. I (we) also submit to the jurisdiction of the United States District Court for the District of Massachusetts with respect to my (our) claim as a Class Member and for purposes of enforcing the release set forth herein. I (we) further acknowledge that I am (we are) bound by and subject to the terms of any Order and Final Judgment (defined below) that may be entered in the Action. I (we) agree to furnish additional information to Lead Counsel and/or the Claims Administrator to support this claim if required to do so. I (we) have not submitted any other claim covering the same purchases, acquisitions, and sales of Biogen common stock during the Class Period and know of no other person or entity having done so on my (our) behalf. Please review the following release for claims against Defendants and sign below. I (We), on behalf of myself (ourselves), and my (our) heirs, estates, executors, administrators, predecessors, successors, assigns, representatives, attorneys, and agents in their capacities as such, and anyone claiming through or on behalf of any of them, hereby acknowledge full and complete satisfaction of, and do hereby fully, finally, and forever waive, compromise, settle, release, resolve, relinquish, discharge, and dismiss all of the Released Plaintiff Claims against Defendants and the Released Defendant Parties as contemplated in the Stipulation. The Stipulation contemplates the issuance of an order and final judgment (the “Order and Final Judgment”), which shall dismiss the Action with prejudice and bar all claims, demands, rights, liabilities, and causes of action of every nature and description (including, but not limited to, any claims for damages, interest, attorneys’ fees, expert or consulting fees, and any other costs, expenses, or liabilities whatsoever), whether known claims or Unknown Claims, contingent or absolute, mature or not mature, discoverable or undiscoverable, liquidated or unliquidated, accrued or not accrued, including those that are concealed or hidden, regardless of legal or equitable theory and whether arising under federal, state, common, or foreign law, or any other law, rule, ordinance, administrative provision, or regulation, that have been or could have been asserted in this or any other action that arise out of, are based upon, or relate in any way to both: (a) any of the allegations, acts, transactions, facts, events, matters, occurrences, representations, or omissions involved, set forth, alleged, or referred to in this Action, or which could have been alleged in this Action, and (b) the purchase, acquisition, holding, sale, or disposition of Biogen securities by any Class Member during the Class Period, including Unknown Claims; provided, however that the Released Plaintiff Claims do not include: (a) any claims relating to the enforcement of the Settlement and (b) any Excluded Claims. Unknown Claims are expressly included in the definition of Released Plaintiff Claims, and such inclusion was expressly bargained for and was a material element of the Settlement and was relied upon by Defendants in entering into the Stipulation. “Unknown Claims” means any Released Plaintiff Claims which Lead Plaintiff or any other Class Member does not know or suspect to exist in his, her, or its favor at the time of the release of such claims, and any Released Defendant Claims which any Defendant or other Released Defendant Party does not know or suspect to exist in his, her, or its favor at the time of the release of such claims, which if known by him, her, or it, might have affected his, her, or its decision(s) with respect to this Settlement. The Settlement is intended to extinguish all of the Released Plaintiff Claims and the Released Defendant Claims and, consistent with such intention, upon the Effective Date, Defendants and Lead Plaintiff expressly waive, and each of the Class Members shall be deemed to have waived, and by operation of the Order and Final Judgment shall have expressly waived, to the fullest extent permitted by law, any and all provisions, rights and benefits conferred by any law of the United States or any state or territory of the United States or any foreign state, or principle of common law or foreign law, which may have the effect of limiting the releases set forth above. This shall include a waiver by the Lead Plaintiff and each of the Class Members and Defendants of any rights pursuant to section 1542 of the California Civil Code (or any similar, comparable, or equivalent provision of any federal, state, or foreign law, or principle of common law), which provides: A GENERAL RELEASE DOES NOT EXTEND TO CLAIMS THAT THE CREDITOR OR RELEASING PARTY DOES NOT KNOW OR SUSPECT TO EXIST IN HIS OR HER FAVOR AT THE TIME OF EXECUTING THE RELEASE AND THAT, IF KNOWN BY HIM OR HER, WOULD HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR OR RELEASED PARTY. The foregoing waiver was separately bargained for, is a material element of the Settlement and was relied upon by the Defendants in entering into the Settlement. This release shall be of no force or effect unless and until the Court approves the Stipulation and the Settlement becomes effective on the Effective Date. Please review the following representations and sign below. I (We) hereby warrant and represent that I (we) have not assigned or transferred or purported to assign or transfer, voluntarily or involuntarily, any matter released pursuant to this release or any other part or portion thereof. I (We) hereby warrant and represent that I (we) have included information about all of my (our) purchases or acquisitions of Biogen common stock that occurred during the period from June 8, 2021 through and including October 12, 2021, all of my (our) sales of Biogen common stock between and including from June 8, 2021 to October 12, 2021, and the number of shares of Biogen common stock held by me (us) at the open of trading on June 8, 2021, and the number of shares of Biogen common stock held by me (us) at the close of trading on October 12, 2021. I (We) hereby warrant and represent that I am (we are) not excluded from the Class as defined in the Notice. I (We) declare under the penalty of perjury under the laws of the United States of America that the foregoing information supplied by the undersigned is true and correct. I Certify and DeclareSignature of Claimant(Required)Please type the name of Claimant. If this claim is being made on the behalf of joint claimants, then each must sign.Signature of Joint ClaimantPlease Type the name of the Joint ClaimantPerson Signing on Behalf of ClaimantCapacity of person signing on behalf of Claimant/Joint Claimant, if other than an individual (e.g., Administrator, Executor, Trustee, President, Custodian, Power of Attorney, etc.).
