William P. Scully
William P. Scully has made 7 open-market purchases worth $8.0M since Sep 21, 2026, in 1 company. The latest: $1.2M of PRTA, filed Oct 26, 2026, scored 31 out of 100.
10% owner, PROTHENA CORP PUBLIC LTD CO
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Purchases
| Filed | Stock | Stake | Score | Bought | 1 week | 1 month |
|---|---|---|---|---|---|---|
| Oct 26 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +15% stake | 31 | $1.2M 150,000 at $8.15 |
waiting | waiting |
| Oct 15 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +12% stake | 28 | $920k 110,000 at $8.36 |
−1.8% | waiting |
| Oct 9 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +69% stake | 40 | $1.8M 215,000 at $8.47 |
−5.5% | waiting |
| Oct 6 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +47% stake | 33 | $857k 100,000 at $8.57 |
+4.2% | waiting |
| Sep 30 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +312% stake | 40 | $1.4M 162,000 at $8.68 |
+0.8% | waiting |
| Sep 29 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +124% stake | 37 | $890k 103,500 at $8.60 |
+1.2% | +1.1% |
| Sep 21 Form 4 (opens sec.gov) |
PRTAPROTHENA CORP PUBLIC LTD CO · 10% owner10% owner · Near 52-week low | +12% stake | 28 | $843k 100,000 at $8.43 |
−2.3% | −8.2% |
Track record (hypothetical): a week after the filing, these buys averaged −0.6% (50% up, 6 measured); a month after, −3.6% (50% up, 2 measured).
Questions
What stock has William P. Scully bought?
PRTA (PROTHENA CORP PUBLIC LTD CO), all on the open market and reported on SEC Form 4.
When did William P. Scully last buy?
Oct 26, 2026: 150,000 shares of PRTA at $8.15, $1.2M in all (Form 4 (opens sec.gov)).
Has William P. Scully filed a notice of a planned sale?
Not in the filings on record. A Form 144 is the notice an insider must file before selling restricted or control shares, and it lands on EDGAR before the sale is reported.
Is William P. Scully a routine or an opportunistic buyer?
There isn't enough history to say yet.
Data as of Oct 26, 2026, from SEC EDGAR Form 4 filings: open-market purchases (code P) of $25,000 or more, and open-market sales. Every row links to its filing. Scores summarise what a filing says (how the score works); outcomes are hypothetical, from the first close after the filing, and past results don't predict future ones. Disclaimer