Prothena insider buys 37,500 shares at $8.62
Prothena Corp Public Ltd Co major shareholder William P. Scully reported open-market purchases of the company’s ordinary shares on August 7, 2026.
Rhea-AI Filing Summary
Prothena Corp Public Ltd Co major shareholder William P. Scully reported open-market purchases of the company’s ordinary shares on August 7, 2026. He bought 34,000 shares directly and 3,500 shares through Manatee Equity Fund LLC at a weighted average price of $8.6192 per share, with trade prices ranging from $8.5094 to $8.7500. Following these trades, he reported 790,000 shares held directly and 83,500 shares held indirectly via Manatee Equity Fund LLC, while an additional 52,000 shares are reported as held indirectly by his spouse. The filer disclaims beneficial ownership of the Manatee-held shares except to the extent of his pecuniary interest.
Insider Trade Summary
Net Buyer: 37,500 shares
Net Buy
3 txns
Insider
SCULLY WILLIAM P
Role
10% Owner
Bought
37,500 shs ($323K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Purchase | Ordinary Shares, par value $0.01 per share F1 | 34,000 | $8.6192 | $293K |
| Purchase | Ordinary Shares, par value $0.01 per share F1, F2 | 3,500 | $8.6192 | $30K |
| holding | Ordinary Shares, par value $0.01 per share | -- | -- | -- |
Holdings After Transaction:
Ordinary Shares, par value $0.01 per share — 790,000 shares (Direct);
Ordinary Shares, par value $0.01 per share — 83,500 shares (Indirect, By Manatee Equity Fund LLC);
Ordinary Shares, par value $0.01 per share — 52,000 shares (Indirect, By Spouse)
Footnotes (2)
- F1. The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $8.5094 to $8.7500, 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.
- F2. The reporting person disclaims beneficial ownership of these securities except to the extent of his pecuniary interest therein.
Key Figures
Direct shares purchased: 34,000 shares
Indirect shares purchased via Manatee Equity Fund LLC: 3,500 shares
Weighted average purchase price: $8.6192 per share
+4 more
7 metrics
Direct shares purchased
34,000 shares
Ordinary shares bought directly on August 7, 2026
Indirect shares purchased via Manatee Equity Fund LLC
3,500 shares
Ordinary shares bought indirectly on August 7, 2026
Weighted average purchase price
$8.6192 per share
Weighted average for trades ranging from $8.5094 to $8.7500
Direct holdings after transaction
790,000 shares
Ordinary shares held directly following August 7, 2026 purchases
Indirect holdings via Manatee Equity Fund LLC after transaction
83,500 shares
Ordinary shares held indirectly through Manatee Equity Fund LLC after purchases
Indirect holdings by spouse
52,000 shares
Ordinary shares reported as held indirectly by spouse
Total reported shares bought
37,500 shares
Sum of direct and Manatee Equity Fund LLC purchases on August 7, 2026
Key Terms
weighted average price, beneficial ownership, pecuniary interest, indirect ownership
4 terms
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 except..."
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.
pecuniary interest financial
"…except to the extent of his pecuniary interest therein."
indirect ownership financial
"Indirect ownership reported via Manatee Equity Fund LLC and by spouse."
FAQ
AI-generated questions and answers. How Rhea-AI works. Not financial advice.
Were the PRTA insider purchases made under a Rule 10b5-1 trading plan?
The Rule 10b5-1 checkbox is not marked as plan-based for these transactions. The trades are reported as open-market purchases without identifying a pre-arranged trading plan in the filing’s data.
AI-generated analysis. How Rhea-AI works. Not financial advice.
