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PRTA stock news · Prothena Corporation plc

Stories about Prothena Corporation plc (PRTA) from the last 90 days, each explained in plain English with whether the news reads good or bad for the company.

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  1. Nov 10, 2026, 5:43 PM ET · Market

    An insider at Prothena Corporation bought over $1.1 million in shares.

    Good for PRTA

    An insider bought 140,000 PRTA shares for about $1.19 million. That purchase is a positive sign for Prothena, but it does not show better business results.

  2. Oct 2, 2026, 4:19 PM ET · Market

    Prothena Corp says some directors and officers are leaving, while new ones are being chosen and hired.

    Neutral

    Prothena's development chief is leaving for a strategic partner, where he will lead a program partnered with Prothena. The filing gives no clear sign this changes the company's outlook.