Arthur W. Homan, 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA), bought 215,000 shares at $8.40 ($1.8M) on 2026-10-07, disclosed to the SEC on 2026-10-09.
10% holder Arthur W. Homan purchased 125,000 shares for $1.05M at $8.40, marking the largest insider purchase in the company's history. This significant accumulation by a major shareholder suggests confidence in the stock's recovery potential despite recent underperformance.
The stock is currently trading at $8.61, a 2.99% gain over the last 5 days but down 7.42% over the past month. The trade executed at a 26.85% discount to the 52-week high of $11.77.
Insider cluster: This is the largest insider purchase ever recorded for PRTA. Market sentiment: The stock is down 16.41% over the last year and is currently trading at a 10.24% premium to its 52-week low of $7.81.
Short interest: The stock has a short interest of 20.05% of the float, indicating significant bearish positioning. Valuation: The forward P/E is negative at -5.76, suggesting the company is currently unprofitable.
Nothing distinguishes this filing.
| # | Price | Shares | Value | % of Total |
|---|---|---|---|---|
| 1 | $8.40 | 125,000 | $1.1M | 57.7% |
| 2 | $8.57 | 90,000 | $771K | 42.3% |
| Total | $8.47 avg | 215,000 | $1.8M | 100% |
| Filing → |
| PRTA | BUY | 2026-10-06 | $857K | — | Filing → |
| PRTA | BUY | 2026-09-30 | $1.4M | — | Filing → |
| PRTA | BUY | 2026-09-29 | $890K | — | Filing → |