Prothena (NASDAQ: PRTA) insider lifts direct stake to 800,000 shares
Rhea-AI Filing Summary
PROTHENA CORP PUBLIC LTD CO (PRTA) reported that ten percent owner William P. Scully purchased 50,000 Ordinary Shares on August 20, 2026, in an open-market or private transaction at a weighted average price of $8.7886 per share. The price reflects multiple purchases at prices ranging from $8.7497 to $8.9000. Following this transaction, Scully directly holds 800,000 Ordinary Shares. He also is reported as having indirect ownership of 83,500 shares held by Manatee Equity Fund LLC, for which he disclaims beneficial ownership except to the extent of his pecuniary interest, and 52,000 shares held by his spouse.
Positive
- None.
Negative
- None.
Insider Trade Summary
Net Buyer: 50,000 shares
Net Buy
3 txns
Insider
SCULLY WILLIAM P
Role
10% Owner
Bought
50,000 shs ($439K)
| Type | Security | Shares | Price | Value |
|---|---|---|---|---|
| Purchase | Ordinary Shares, par value $0.01 per share F1 | 50,000 | $8.7886 | $439K |
| holding | Ordinary Shares, par value $0.01 per share F2 | -- | -- | -- |
| holding | Ordinary Shares, par value $0.01 per share | -- | -- | -- |
Holdings After Transaction:
Ordinary Shares, par value $0.01 per share — 800,000 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 $8.7497 to $8.9000, 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
Shares purchased: 50,000 Ordinary Shares
Weighted average purchase price: $8.7886 per share
Purchase price range: $8.7497 to $8.9000 per share
+3 more
6 metrics
Shares purchased
50,000 Ordinary Shares
Open-market or private purchase on August 20, 2026
Weighted average purchase price
$8.7886 per share
Average price across multiple purchase transactions
Purchase price range
$8.7497 to $8.9000 per share
Range of prices for the individual trades included in the Form 4
Direct holdings after transaction
800,000 Ordinary Shares
Shares directly owned by William P. Scully following the purchase
Indirect holdings via Manatee Equity Fund LLC
83,500 Ordinary Shares
Indirect ownership with beneficial ownership disclaimed except for pecuniary interest
Indirect holdings by spouse
52,000 Ordinary Shares
Shares held indirectly through spouse
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"
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
"direct_or_indirect": "I", "nature_of_ownership": "By Manatee Equity Fund LLC""
FAQ
What insider transaction did William P. Scully report for PRTA?
William P. Scully reported purchasing 50,000 Ordinary Shares of PRTA on August 20, 2026 in an open-market or private transaction at a weighted average price of $8.7886 per share, based on multiple trades between $8.7497 and $8.9000.
Was the PRTA insider trade made under a Rule 10b5-1 plan?
The document-level Rule 10b5-1 checkbox is marked false, indicating the transactions were not affirmed as made pursuant to a Rule 10b5-1 trading plan in this filing.
AI-generated analysis. How Rhea-AI works. Not financial advice.
