Arthur W. Homan, 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA), bought 27,000 shares at $9.47 ($256K) on 2026-09-02, disclosed to the SEC on 2026-09-03.
10% shareholder Arthur W. Homan purchased $255,738.60 worth of shares at $9.47, marking the largest insider purchase in the company's history, signaling confidence in the stock's recovery potential. This move comes as the stock has rallied 12.88% over the past 30 days and sits just 18.48% below its 52-week high.
PRTA has surged 12.88% over the last 30 days and is currently trading 18.48% below its 52-week high of $11.77, with a current price of $9.595.
1) Q2 earnings on August 6, 2026, where Prothena delivered an earnings surprise of +17.95%. 2) Q2 earnings on August 6, 2026, where Prothena missed revenue estimates by -1.94%. 3) Milestone decision for partnered pipeline programs, as noted in the August 7, 2026, Zacks article.
The stock carries significant risk with a short interest of 20.05% of the float, and recent news indicates a mixed performance with an earnings beat but a revenue miss.
Nothing distinguishes this filing.
| Filing → |
| PRTA | BUY | 2026-10-09 | $1.8M | — | Filing → |
| PRTA | BUY | 2026-10-06 | $857K | — | Filing → |
| PRTA | BUY | 2026-09-30 | $1.4M | — | Filing → |