SCHEDULE 13G

PROTHENA CORP PLC

Ordinary Shares · CUSIP: G72800108

Event date: 2025-05-29

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Logos Global Management LP

  Shares: 2,950,000.00 · Class: 5.5%

• Logos Global Management GP LLC

  Shares: 2,950,000.00 · Class: 5.5%

• Logos Global Master Fund LP

  Shares: 2,950,000.00 · Class: 5.5%

• Logos GP LLC

  Shares: 2,950,000.00 · Class: 5.5%

• Arsani William

  Shares: 2,950,000.00 · Class: 5.5%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.