Major Prothena (PRTA) holder William P. Scully buys 50,000 shares in open market
Filing Impact
Filing Sentiment
Form Type
4
Rhea-AI Filing Summary
PROTHENA CORP PUBLIC LTD CO major shareholder William P. Scully reported an open-market purchase of 50,000 ordinary shares at a weighted average price of $9.426 per share on June 2, 2026. Following this transaction, he directly holds 886,000 ordinary shares.
The filing also lists indirect holdings of 52,000 shares held by his spouse and 80,000 shares held by Manatee Equity Fund LLC. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest in them.
Positive
- None.
Negative
- None.
Insider Trade Summary
Net Buyer: 50,000 shares ($471,300)
Net Buy
3 txns
Insider
SCULLY WILLIAM P
Role
null
Bought
50,000 shs ($471K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Purchase | Ordinary Shares, par value $0.01 per share | 50,000 | $9.426 | $471K |
| holding | Ordinary Shares, par value $0.01 per share | -- | -- | -- |
| holding | Ordinary Shares, par value $0.01 per share | -- | -- | -- |
Holdings After Transaction:
Ordinary Shares, par value $0.01 per share — 886,000 shares (Direct, null);
Ordinary Shares, par value $0.01 per share — 80,000 shares (Indirect, By Manatee Equity Fund LLC)
Footnotes (1)
- The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $9.2323 to $9.4892, inclusive. The reporting person undertakes to provide to Prothena Corp Public Ltd Co, any security holder of Prothena Corp Public Ltd Co, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the ranges set forth in footnote (1) to this Form 4. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.
Key Figures
Open-market purchase: 50,000 shares
Weighted average purchase price: $9.426 per share
Direct holdings after transaction: 886,000 shares
+2 more
5 metrics
Open-market purchase
50,000 shares
Ordinary shares bought on June 2, 2026
Weighted average purchase price
$9.426 per share
Open-market transaction on June 2, 2026
Direct holdings after transaction
886,000 shares
Ordinary shares directly owned following the purchase
Indirect holdings by spouse
52,000 shares
Ordinary shares reported as held by spouse
Indirect holdings by Manatee Equity Fund LLC
80,000 shares
Ordinary shares reported as held by Manatee Equity Fund LLC
Key Terms
open-market purchase, weighted average price, beneficial ownership
3 terms
open-market purchase financial
"Purchase in open market or private transaction"
An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.
weighted average price financial
"The price reported in Column 4 is a weighted average price."
Weighted average price is the average price of a security where each trade or component is counted according to its size, so bigger trades pull the average more than smaller ones. Think of it like calculating the average cost of a grocery haul where items you bought more of have greater influence on the final per-item cost. Investors use it to understand the true average price paid or received, judge execution quality, and compare trading performance against market movement.
beneficial ownership financial
"The reporting person disclaims beneficial ownership of these securities"
Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.
