William P. Scully is 10% Owner at PROTHENA CORP PUBLIC LTD CO (PRTA). They have made 19 open-market trades across 2 companies since 2015, most recently 2026-08-20.
CIK 0001045463
17 open-market purchases totalling $8.5M since 2015, against 2 sales. Across 15 scored buys the stock is up 1.6% at ninety days, and 1.1 points behind the S&P over the same stretch.
17 scored purchases · one row per filing · discretionary only
| Ticker | Shares | Value |
|---|---|---|
| PRTA | 800,000 | $6.7M |
| MBLX | 2,956,666 | $1.1M |
| Total | $7.8M |
Shares reported on the most recent Form 4, priced at the 2026-08-21 close.
Counted per filing, not per execution lot — a purchase filled in several tranches is one decision.
| 7d | 30d | 90d | |
|---|---|---|---|
| Accuracy | 18% | 24% | 40% |
| Avg Move | -9.7% | -5.5% | +1.6% |
| Alpha | -6.7% | -4.8% | -1.1% |
| Scored | 17 | 17 | 15 |
| Ticker | Type | Traded | Filed | Price | Value | 7d Stock | 30d Stock | 90d Stock |
|---|---|---|---|---|---|---|---|---|
| PRTA | BUY | 2026-08-20 | 2026-08-21 | $8.79 | $439K | +4.8% | -7.9% | — |
| PRTA | BUY | 2026-08-07 | 2026-08-10 | $8.62 | $323K | -0.3% | +2.6% | — |
| PRTA | BUY | 2026-06-16 | 2026-06-18 | $7.90 | $158K | +7.4% | -2.7% | -7.6% |
| PRTA | BUY | 2026-06-11 | 2026-06-12 | $8.17 | $1.0M | +6.7% | +1.6% | +3.8% |
| PRTA | BUY | 2026-06-04 | 2026-06-05 | $9.31 | $465K | -3.5% | +8.2% | +9.4% |
| PRTA | BUY | 2026-06-02 | 2026-06-03 | $9.43 | $471K | -10.7% | +3.9% | +5.3% |
| PRTA | BUY | 2026-05-22 | 2026-05-26 | $9.81 | $981K | -13.3% | -8.4% | -7.3% |
| PRTA | BUY | 2024-12-18 | 2025-05-02 | $13.43 | $3.8M | -19.0% | -45.2% | -19.2% |
| MBLX | SELL | 2016-09-12 | 2016-09-14 | $0.33 | $23K | +33.3% | +58.3% | +4.2% |
| MBLX | SELL | 2016-09-08 | 2016-09-12 | $0.35 | $58K | +10.9% | +33.1% | -5.4% |
| MBLX | BUY | 2015-09-17 | 2015-09-21 | $2.11 | $67K | -12.8% | -0.7% | -0.7% |
| MBLX | BUY | 2015-09-15 | 2016-01-07 | $2.15 | $101K | -20.0% | -13.6% | +14.5% |
| MBLX | BUY | 2015-09-15 | 2016-01-07 | $2.15 | $203K | -20.0% | -13.6% | +14.5% |
| MBLX | BUY | 2015-09-14 | 2015-09-16 | $2.16 | $146K | -12.8% | -0.7% | -0.7% |
| MBLX | BUY | 2015-09-10 | 2016-01-07 | $2.21 | $55K | -20.0% | -13.6% | +14.5% |
| MBLX | BUY | 2015-09-10 | 2015-09-14 | $2.71 | $68K | -12.8% | -0.7% | -0.7% |
| MBLX | BUY | 2015-09-08 | 2015-09-10 | $2.23 | $89K | -12.8% | -0.7% | -0.7% |
| MBLX | BUY | 2015-09-03 | 2015-09-08 | $2.15 | $92K | -12.8% | -0.7% | -0.7% |
| MBLX | BUY | 2015-08-28 | 2015-09-01 | $1.99 | $53K | -12.8% | -0.7% | -0.7% |
Grouped by shared companies and similar filing behaviour. This is a similarity measure, not a ranking or a performance signal.