PROTHENA CORP PUBLIC LTD CO 8-K

What Happened
Prothena Corporation plc (PRTA) announced on February 27, 2026, that it has adopted a share repurchase plan authorizing repurchases of up to $100.0 million of its outstanding ordinary shares (par value $0.01). The announcement was made via a press release filed under Regulation FD and included in the Form 8-K.

Key Details

• Company: Prothena Corporation plc (ticker: PRTA). Announcement date: February 27, 2026.
• Authorization: Up to $100.0 million of ordinary shares may be repurchased.
• Term: Plan expires on December 31, 2026.
• Flexibility: Repurchases may be suspended or discontinued at any time; the plan does not obligate the company to acquire any shares.
• Disclosure: Press release attached as Exhibit 99.1 to the Form 8-K.

Why It Matters
A share repurchase program can affect the company’s capital allocation and potentially increase earnings per share by reducing outstanding share count if shares are actually repurchased. For investors, the $100M authorization signals management’s willingness to return capital to shareholders or to use buybacks as a tool for balance-sheet management, but there is no guarantee any specific repurchases will occur given the plan’s discretionary nature.