PRTA
PROTHENA CORP PUBLIC LTD CO · Healthcare · Market cap $436.4M
Insiders bought $7.6M net in the last 90 days ·2 sellers, 1 buyer· 2 of 2 sales under Rule 10b5-1 plans· latest Form 4 filed Oct 15, 2026
Insider Buying
$10.9M
reported purchases (SEC code P)
Insider Selling
$136K
reported sales (SEC code S)
Unique Insiders
3
in the rolling window
Latest filing
Oct 15, 2026
SCULLY WILLIAM P
PROTHENA CORP PUBLIC LTD CO (PRTA) has 25 SEC Form 4 filings (38 transaction rows) in the rolling window, disclosed by 3 distinct insiders. Most recent filing: Oct 15, 2026.
Inside the rolling window, 3 insiders at PROTHENA CORP PUBLIC LTD CO reported 16 open-market purchases totaling $10.9M and 2 open-market sales totaling $136K. The most active filer is 10% Owner SCULLY WILLIAM P with 16 filings. Insiders have net bought $10.7M over the trailing 6 months. The largest single insider purchase in this window was $1.4M by 10% Owner SCULLY WILLIAM P on Sep 29, 2026. The most recent open-market filing is a purchase of 100,000 shares by 10% Owner SCULLY WILLIAM P, dated Oct 13, 2026, worth $835K.
- Industry:Biotechnology
- CEO:Gene G. Kinney
- Employees:67
- HQ:Dublin, DU, IE
- IPO:2012-12-20
| Source | |||||||
|---|---|---|---|---|---|---|---|
| 10% Owner | Purchase | 100,000 | $835K | Oct 15 | +0.0% | SEC ↗ | |
| 10% Owner | Purchase | 10,000 | $85K | Oct 15 | +0.0% | SEC ↗ | |
| 10% Owner | Purchase | 125,000 | $1.1M | Oct 9 | -3.8% | SEC ↗ | |
| 10% Owner | Purchase | 90,000 | $771K | Oct 9 | -3.8% | SEC ↗ | |
| 10% Owner | Purchase | 100,000 | $857K | Oct 6 | +6.0% | SEC ↗ | |
| 10% Owner | Purchase | 162,000 | $1.4M | Sep 30 | +1.4% | SEC ↗ | |
| 10% Owner | Purchase | 103,500 | $890K | Sep 29 | -3.2% | SEC ↗ | |
| 10% Owner | Purchase | 100,000 | $843K | Sep 21 | -0.1% | SEC ↗ | |
| 10% Owner | Purchase | 27,000 | $256K | Sep 3 | -11.5% | SEC ↗ | |
| 10% Owner | Purchase | 50,000 | $439K | Aug 21 | -10.1% | SEC ↗ | |
| 10% Owner | Purchase | 37,500 | $323K | Aug 10 | — | SEC ↗ | |
Kingston Anne EvansFirst filing | Chief Strategy Officer | Sale | 7,662 | $65K | Jul 31 | — | SEC ↗ |
Isaacs Michael JohnFirst filing | General Counsel & Company Sec. | Sale | 8,386 | $71K | Jul 31 | — | SEC ↗ |
| 10% Owner | Purchase | 20,000 | $158K | Jun 18 | — | SEC ↗ | |
| 10% Owner | Purchase | 125,000 | $1.0M | Jun 12 | — | SEC ↗ | |
| 10% Owner | Purchase | 50,000 | $465K | Jun 5 | — | SEC ↗ | |
| 10% Owner | Purchase | 50,000 | $471K | Jun 3 | — | SEC ↗ | |
SCULLY WILLIAM PFirst filing | 10% Owner | Purchase | 100,000 | $981K | May 26 | — | SEC ↗ |
Earnings: last 7 quarters
Frequently asked questions
How many SEC Form 4 insider filings does PRTA have?
PROTHENA CORP PUBLIC LTD CO (PRTA) has 25 SEC Form 4 filings (38 transaction rows) in the rolling 365-day window, disclosed by 3 distinct insiders. Most recent filing: Oct 15, 2026.
When was the most recent SEC Form 4 filing for PRTA?
The most recent Form 4 filing for PRTA on Tracefour is dated Oct 15, 2026.
Who is the most active insider at PRTA?
The most active SEC Form 4 filer at PRTA in the rolling window is 10% Owner SCULLY WILLIAM P, with 16 filings.
What is the net insider flow at PRTA over the last 6 months?
Over the trailing 180 days, insiders at PRTA have net bought $10.7M based on SEC Form 4 disclosures.
What was the largest insider purchase at PRTA?
The largest single insider open-market purchase at PRTA in the rolling window was $1.4M by 10% Owner SCULLY WILLIAM P on 2026-09-29.
What is the total insider buy and sell value at PRTA in the current window?
Inside the rolling window, insiders at PRTA bought $10.9M and sold $136K based on SEC Form 4 filings.
Can I get alerts for PRTA insider trading?
Yes. Tracefour sends a free email when a new SEC Form 4 purchase or sale is filed at PROTHENA CORP PUBLIC LTD CO (PRTA). Alerts are set per company from the page itself, there is no paid tier, and each email links to the original filing on SEC EDGAR.
Related companies
PROTHENA CORP PUBLIC LTD CO is in the Healthcare sector.