Prothena CORP Public LTD CO Schedule 13G passive stakes

Todd W. Fennell has filed a Schedule 13G, reporting beneficial ownership of approximately 9.8% of Prothena Corp Public Ltd Co's ordinary shares as of June 30, 2026.

Rubric Capital Management LP and David Rosen have reported a 9.29% beneficial ownership stake in Prothena Corporation plc.

William P. Scully has disclosed beneficial ownership of 5,378,846 ordinary shares, representing approximately 10.3% of Prothena Corp Public Ltd Co.

Rubric Capital Management LP and David Rosen have disclosed a passive 6.83% beneficial ownership stake in Prothena Corporation Public Limited Company as of December 31, 2025.

ADAR1 Capital Management, along with its affiliates and manager Daniel Schneeberger, reported a beneficial ownership of 2.7% in Prothena Corporation Public Limited Company as of September 30, 2025.

Todd W. Fennell has reported a beneficial ownership of 8.35% of Prothena Corp Public Ltd Co's Ordinary Shares, held primarily through various trusts.

William P. Scully has filed an amended Schedule 13G, disclosing a beneficial ownership of 9.8% of Prothena Corp Public Ltd Co's Ordinary Shares.

BlackRock, Inc. has reported an increased beneficial ownership of 5.7% in Prothena Corporation Public Limited Company's common stock as of September 30, 2025.

ADAR1 Capital Management, LLC and related entities have disclosed a passive beneficial ownership of 6.3% in Prothena Corporation Public Limited Company.

Logos Global Management LP and its affiliates have filed an amended Schedule 13G, reporting zero beneficial ownership in Prothena Corp Public Ltd Co Ordinary Shares.

T. Rowe Price Associates, Inc. has filed an amendment to its Schedule 13G, disclosing a 0.1% beneficial ownership stake in Prothena Corp PLC as of June 30, 2025.

William P. Scully has disclosed an increased beneficial ownership of 9.9% in Prothena Corp Public Ltd Co, totaling 5,351,846 Ordinary Shares.

Todd W. Fennell has reported beneficial ownership of 8.1% of Prothena Corp Public Ltd Co's Ordinary Shares, totaling 4,350,846 shares.

Wellington Management Group LLP and its affiliates have filed an amended Schedule 13G, disclosing a beneficial ownership of 0.2% of Prothena Corporation Public Limited Company's Ordinary Shares as of May 30, 2025.

Logos Global Management LP and its affiliated entities have disclosed a 5.5% beneficial ownership stake in Prothena Corp Public Ltd Co, holding 2,950,000 Ordinary Shares.

Todd W. Fennell has filed an amended Schedule 13G, disclosing beneficial ownership of 8.5% of Prothena Corp Public Ltd Co's Ordinary Shares as an independent trustee.

William P. Scully has filed an amended Schedule 13G, revealing beneficial ownership of 10.4% of Prothena Corp Public Ltd Co's Ordinary Shares as of March 31, 2025.

William P. Scully has filed an amended Schedule 13G, revealing a beneficial ownership of 10.3% of Prothena Corp Public Ltd Co's Ordinary Shares as of December 31, 2024.

Todd W. Fennell has filed an amendment to his Schedule 13G, disclosing a beneficial ownership of 8.63% of Prothena Corp Public Ltd Co's ordinary shares as of December 31, 2024.

Wellington Management Group LLP and its affiliates have disclosed a significant beneficial ownership stake of 9.54% in Prothena Corporation Public Limited Company as of December 31, 2024.