Claim Form – Prothena Settlement

1. To recover as a member of the Settlement Class based on your claims in the action entitled In re Prothena Corporation plc Sec. Litig., Case No. 1:18-cv-06425-ALC (S.D.N.Y.) (the “Action”), you must complete and sign this Proof of Claim and Release form (“Claim Form”). If you fail to submit a timely and properly addressed (as explained in paragraph 3 below) Claim Form, your claim may be rejected and you may not receive any recovery from the Net Settlement Fund created in connection with the proposed Settlement.

2. Submission of this Claim Form, however, does not assure that you will share in the proceeds of the Settlement of the Action.

3. THIS CLAIM FORM MUST BE SUBMITTED ONLINE NO LATER THAN NOVEMBER 25, 2019 OR, IF MAILED, BE POSTMARKED OR RECEIVED NO LATER THAN NOVEMBER 25, 2019, ADDRESSED AS FOLLOWS:

In re Prothena Corp. plc Sec. Litig.
c/o Strategic Claims Services
P.O. Box 230
600 N. Jackson Street, Suite 205
Media, PA 19063

4. If you are a member of the Settlement Class and you do not timely request exclusion in response to the Notice dated September 24, 2019, you are bound by the terms of any judgment entered in the Action, including the releases provided therein, WHETHER OR NOT YOU SUBMIT A CLAIM FORM OR RECEIVE A PAYMENT.

1. If you purchased or acquired publicly traded ordinary shares of Prothena Corporation plc during the period from October 15, 2015 through April 20, 2018, inclusive (the “Class Period”) and held the stock in your name, you are the beneficial purchaser as well as the record purchaser. If, however, you purchased or acquired Prothena shares during the Class Period through a third party, such as a brokerage firm, you are the beneficial purchaser and the third party is the record purchaser.

2. Use Part I of this form entitled “Claimant Information” to identify each beneficial purchaser or acquirer of Prothena publicly traded ordinary shares that forms the basis of this claim, as well as the purchaser or acquirer of record if different. THIS CLAIM MUST BE FILED BY THE ACTUAL BENEFICIAL PURCHASER(S) OR THE LEGAL REPRESENTATIVE OF SUCH PURCHASER(S).

3. All joint purchasers must sign this claim. Executors, administrators, guardians, conservators, and trustees must complete and sign this claim on behalf of persons 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.

1. Use Part II of this form entitled “Schedule of Transactions in Prothena Publicly Traded Ordinary Shares” to supply all required details of your transaction(s) in Prothena shares. If you need more space or additional schedules, 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.

2. On the schedules, provide all of the requested information with respect to: (i) all of your holdings of Prothena shares as of the beginning of trading on October 15, 2015; (ii) all of your purchases, acquisitions, and sales of Prothena shares during the time periods below; and (iii) all of your holdings in Prothena shares as of the close of trading on July 20, 2018, whether such purchases, acquisitions, sales or transactions resulted in a profit or a loss. Failure to report all such transactions may result in the rejection of your claim.

3. The date of covering a “short sale” is deemed to be the date of purchase of Prothena shares. The date of a “short sale” is deemed to be the date of sale.

4. Copies of broker confirmations or other documentation of your transactions in Prothena publicly traded ordinary shares must be attached to your claim. 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 PROTHENA ORDINARY SHARES.

5. NOTICE REGARDING ELECTRONIC FILES: Certain claimants with large numbers of transactions may request, or may be requested, to submit information regarding their transactions in electronic files. All claimants MUST submit a manually signed paper Claim Form whether or not they also submit electronic copies. If you wish to file your claim electronically, you must contact the Claims Administrator at (877) 310-6376 to obtain the required file layout. No electronic files 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.

The 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. Complete names of all persons and entities must be provided.

Below is a summary of the transactions you entered. Your Beginning Balance plus Purchases/Acquisitions minus Sales and Unsold Holdings should equal zero. Please correct any errors below to ensure that all transactions are accounted for.

YOU MUST READ AND SIGN THE RELEASE BELOW. FAILURE TO SIGN MAY RESULT IN A DELAY IN PROCESSING OR THE REJECTION OF YOUR CLAIM.

1. I (We) submit this Proof of Claim and Release under the terms of the Stipulation and Agreement of Settlement, dated August 26, 2019 (the “Stipulation”) described in the Notice. I (We) also submit to the jurisdiction of the United States District Court for the Southern District of New York, with respect to my (our) claim as a Settlement Class Member(s) 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 judgment that may be entered in the Action. I (We) agree to furnish additional information to the Claims Administrator to support this claim (including transactions in other Prothena securities) if requested to do so. I (We) have not submitted any other claim in the Action covering the same purchases or sales of Prothena ordinary shares during the Class Period and know of no other person having done so on my (our) behalf.

2. I (We) hereby acknowledge full and complete satisfaction of, and do hereby fully, finally, and forever settle, release, and discharge from the Released Claims each and all of the Released Defendant Parties, both as defined in the accompanying Notice. This release shall be of no force or effect unless and until the Court approves the Settlement and the Settlement becomes effective on the Effective Date (as defined in the Stipulation).

3. 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.

4. I (We) hereby warrant and represent that I (we) have included the information requested about all of my (our) transactions in Prothena ordinary shares which are the subject of this claim, as well as the opening and closing positions in such securities held by me (us) on the dates requested in this Claim Form.

5. I (We) certify that I am (we are) not subject to backup withholding under the provisions of Section 3406(a)(1)(C) of the Internal Revenue Code.

I (We) declare under penalty of perjury under the laws of the United States of America that all of the foregoing information supplied on this Claim Form by the undersigned is true and correct.