William P Scully

10% Owner William P Scully bought 20,000 shares of PRTA at $7.90 on 2026-06-16, raising holdings to 756,000 shares amid -92.8% annual revenue decline.

William P Scully, a 10% shareholder, purchased 20,000 shares at $7.90 on 2026-06-16, the third consecutive buy in June after similar purchases on 2026-06-04 and 2026-06-02. His same-ticker history at PRTA shows mixed results: a 2025-01-14 buy returned +8.6% in 30 days but -22.3% over 90 days, and a 2024-12-31 buy returned +13.2% in 30 days but -4.7% over 90 days, with 0 of 2 measurable prior buys achieving positive 90-day returns. The company's fundamentals present a stark backdrop—annual revenue contracted 92.8% year-over-year, and the company reported negative full-year net income, though the latest quarter showed $51.1M in revenue and $32.7M in net income. The stock trades at $8.79, down 25.5% from its 52-week high of $11.80 and down 3.1% over 30 days, while this insider's cross-ticker track record shows an average 90-day return of -11.5% with a 0.00% win rate across 9 prior buys. The pattern of rapid-fire accumulation during a period of significant revenue decline and prior underperformance at this ticker warrants attention to whether this reflects conviction or other factors.

10% owner Scully buys 125,000 PRTA shares at $8.17; stock down 30.1% from 52-week high, recent buys show no 90d win rate.

William P Scully, a 10% owner, purchased 125,000 shares at $8.17 on 2026-06-11, increasing his holdings to 1,061,000 shares (+13.4% from prior holdings of 936,000 shares). The transaction occurs with the stock at $8.25 (current price), trading -30.1% below its 52-week high of $11.80 and down 14.1% over the prior 30 days. At the PRTA ticker level, Scully has made three purchases in the past two weeks (2026-06-04, 2026-06-02, 2026-05-22), all with outcomes not yet measurable. His broader cross-ticker track record shows an average 90-day return of -11.5% with a 0.00% win rate across 9 prior buys, and at PRTA specifically, 0 of 2 completed buys achieved a positive 90-day return. Fundamentally, the company reported a sharp revenue decline of -92.8% year-over-year and was unprofitable over its most recent full fiscal year, creating a divergence between the insider's accumulation activity and deteriorating business fundamentals.

10% owner William P Scully buys 50,000 shares of PRTA at $9.31; stock down 24.8% from 52-week high, company saw -92.8% annual revenue decline

William P Scully, a 10% owner of Prothena Corp, purchased 50,000 shares at $9.31 on 2026-06-04, increasing his holdings to 936,000 shares from 886,000 shares. The purchase occurred as PRTA trades 24.8% below its 52-week high of $11.80 and the company reported a -92.8% annual revenue decline. Notably, Scully's prior five purchases at this ticker have a 0% win rate at the 90-day mark, with his most recent buy on 2026-05-22 showing -6.4% returns both 30 and 90 days out. The company's fundamentals remain concerning: while the latest quarter showed $51.1M in revenue and $32.7M in net income, the full-year fiscal results were negative, and this latest acquisition adds to a pattern where Scully's historical purchases across all tickers have generated a 0.00% 90-day win rate.

10% Owner William P Scully bought 50,000 PRTA shares at $9.43; stock down -24.7% from 52-week high, revenue collapsed -92.8% YoY

William P Scully, a 10% owner, purchased 50,000 shares at $9.43 on 2026-06-02, increasing his holdings by 50,000 shares to 886,000 shares. The timing follows significant recent downside: the stock is -24.7% from its 52-week high of $11.80 and down -17.6% over 30 days. However, his prior purchases at PRTA show a consistent pattern of underperformance at the 90-day mark: all 5 prior buys at this ticker declined or stalled by 90 days (ranging from -22.3% to -4.7%), with 0 of 5 well-timed at that horizon. Most critically, the company's fundamentals are deteriorating sharply: annual revenue growth of -92.8% year-over-year and full-year net income was negative, despite the latest quarter reporting $51.1M revenue and $32.7M net income. This disconnect—between recent quarterly profitability and full-year losses, combined with the deep revenue collapse—suggests structural headwinds that merit investor scrutiny.

10% owner Scully buys 100,000 shares at $9.81; stock down 8.9% in 30 days, 0 of 5 prior PRTA buys were 90-day profitable.

William P Scully, a 10% owner, purchased 100,000 shares at $9.81 on 2026-05-22, increasing his holdings from 736,000 to 836,000 shares. The transaction occurred near the upper end of the 52-week range ($4.32–$11.80), only 17.0% below the 52-week high. However, the stock has declined 8.9% in the 30 days following the trade. His prior trading pattern at PRTA is notably unfavorable: across 5 previous buys at this ticker, none showed positive returns at the 90-day mark, with outcomes ranging from -4.7% to -22.3%. His cross-ticker track record shows an average 90-day return of -11.5% across 6 prior buys (win rate 0.00%). Recent fundamentals show the company reported a net loss over its most recent full fiscal year despite a $32.7M gain in the latest quarter, paired with a dramatic 92.8% decline in annual revenue growth.

10% owner Scully purchases 207,436 shares for $2.7M across 6 transactions (Dec–Jan) at blended avg $13.26; stock now $8.50, down 65.7% from 52-week high.

William P. Scully, a 10% owner, executed 6 separate purchases totaling 207,436 shares for $2,749,916.18 between December 18, 2024 and January 14, 2025, at a blended average price of $13.26. The acquisition brought his post-transaction holdings to 47,000 shares, representing a net purchase of 207,436 shares. The current price of $8.50 sits 65.7% below the 52-week high of $24.79 and is down 30.0% over 30 days and 40.3% over 90 days. Context matters: the company is unprofitable with a full-year net income of $-59,001,000.00, though it achieved annual revenue growth of 47.9%. The magnitude of capital deployed ($2.7M) by a 10% owner through a structured series of purchases during a sharp price decline merits monitoring, particularly given the company's losses and deteriorating stock momentum.