Arthur W. Homan, 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA), bought 100,000 shares at $8.43 ($843K) on 2026-09-18, disclosed to the SEC on 2026-09-21.
10% shareholder Arthur W. Homan purchased 100,000 shares for $843,460, marking the largest insider purchase in the company's history. This significant capital commitment by a major shareholder suggests confidence in the stock's recovery potential following recent underperformance.
The stock is trading at $8.56, down 9.37% over the last 30 days and 10.28% over the last 90 days, but remains 9.47% above its 52-week low of $7.82.
1) Q2 earnings on June 30, 2026: Coming off a +17.95% earnings surprise and -1.94% revenue miss, the next print will be a key setup. 2) Milestone decision for partnered pipeline programs nears, as highlighted in the August 7, 2026 news. 3) The largest insider purchase ever recorded serves as a momentum catalyst to watch.
The stock faces significant risk with a short interest of 19.93% of the float, and recent news indicates a mixed quarter with a revenue miss despite an earnings beat.
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 → |