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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Smith Brandon S.

Thu, 05 Mar 2026 16:51:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Smith Brandon S.

Thu, 05 Mar 2026 16:51:00 -0500

si-local-file:///var/storage/secattach/20260305/26119915.html

Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Swanson Chad J.

Thu, 05 Mar 2026 16:51:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Swanson Chad J.

Thu, 05 Mar 2026 16:51:00 -0500

si-local-file:///var/storage/secattach/20260305/26119917.html

Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Walker Karin L

Thu, 05 Mar 2026 16:51:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Walker Karin L

Thu, 05 Mar 2026 16:51:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Zago Wagner M.

Thu, 05 Mar 2026 16:51:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Zago Wagner M.

Thu, 05 Mar 2026 16:51:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Kinney Gene G.

Thu, 05 Mar 2026 16:50:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Kinney Gene G.

Thu, 05 Mar 2026 16:50:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Malecek Michael J

Thu, 05 Mar 2026 16:50:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Malecek Michael J

Thu, 05 Mar 2026 16:50:00 -0500

si-local-file:///var/storage/secattach/20260305/26119901.html

Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Nguyen Tran

Thu, 05 Mar 2026 16:50:00 -0500

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Form 4 PROTHENA CORP PUBLIC For: Mar 03 Filed by: Nguyen Tran

Thu, 05 Mar 2026 16:50:00 -0500

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Form EFFECT PROTHENA CORP PUBLIC

Tue, 03 Mar 2026 06:06:00 -0500

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Form EFFECT PROTHENA CORP PUBLIC

Tue, 03 Mar 2026 06:06:00 -0500

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Form 8-K PROTHENA CORP PUBLIC For: Feb 27

Fri, 27 Feb 2026 16:46:00 -0500

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Form 8-K PROTHENA CORP PUBLIC For: Feb 27

Fri, 27 Feb 2026 16:46:00 -0500

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Form POS AM PROTHENA CORP PUBLIC

Fri, 27 Feb 2026 16:42:00 -0500

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Form POS AM PROTHENA CORP PUBLIC

Fri, 27 Feb 2026 16:42:00 -0500

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Prothena authorizes $100 million share repurchase program

Fri, 27 Feb 2026 16:15:25 -0500

Prothena Corporation plc (NASDAQ: PRTA) announced its board of directors authorized a share repurchase program allowing the company to buy back up to $100 million of its outstanding ordinary shares.

The Dublin-based biotechnology company reported cash, cash equivalents and restricted cash of $308.4 million with no debt as of December 31, 2025. The company projects ending 2026 with approximately $255 million in cash, excluding potential share purchases under the repurchase plan.

Prothena may conduct repurchases through open market transactions in accordance with Rule 10b-18 of the Securities Exchange Act and may establish Rule 10b5-1 plans to facilitate purchases. The timing, number of

Prothena authorizes $100 million share repurchase program

Fri, 27 Feb 2026 16:15:25 -0500

Prothena Corporation plc (NASDAQ: PRTA) announced its board of directors authorized a share repurchase program allowing the company to buy back up to $100 million of its outstanding ordinary shares.

Prothena authorizes $100 million share repurchase program

Fri, 27 Feb 2026 16:15:25 -0500

Prothena Corporation plc (NASDAQ: PRTA) announced its board of directors authorized a share repurchase program allowing the company to buy back up to $100 million of its outstanding ordinary shares.

Prothena authorizes $100 million share repurchase program

Fri, 27 Feb 2026 16:15:25 -0500

Prothena Corporation plc (NASDAQ: PRTA) announced its board of directors authorized a share repurchase program allowing the company to buy back up to $100 million of its outstanding ordinary shares.

Prothena Announces up to $100 Million Share Repurchase Plan

Fri, 27 Feb 2026 16:15:00 -0500

DUBLIN--(BUSINESS WIRE)-- Prothena Corporation plc (NASDAQ:PRTA), a late-stage clinical biotechnology company with a robust pipeline of investigational therapeutics built on protein dysregulation expertise, today announced that its Board of Directors has authorized a Share Repurchase Plan under which the Company may repurchase up to $100.0 million of the Company’s outstanding ordinary shares, par value $0.01 per share.

Prothena had cash, cash equivalents and restricted cash of $308.4 million and no debt as of December 31, 2025. Excluding any potential purchases under this Share Repurchase Plan, Prothena expects to end the year with approximately $255 million in cash, cash