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Prothena Corp Public Ltd Co (NASDAQ:PRTA)
IE · Delayed Price · Currency is USD
8.20-0.05 (-0.61%)
Insider Score
––Not scored
PRTA Insider Score
Insiders filed in the last 90 days, but none of those trades qualified for scoring — round-trip buys and filings whose price is far off the market are excluded.
PRTA Stock Insider Trading Activity
PRTA stock’s insider trading shows 17 purchases for an estimated $10.85M and 2 sales on the open market for an estimated $135.97K by company insiders over the last 6 months.
Not enough price history.
Insider Trading Activity (Form 4 Filings)
An insider trade occurs when an individual that has non-public information about a company buys or sells shares of that company’s stock. Examples of insiders include a company’s executive officers (CEO, CFO, COO), its board of directors, and its major shareholders. Insiders are required to submit their trading activity to the SEC through Form 4 filings.
Scored window · last 90 days0 qualifying buys0 insiders$7.76M bought— these are the numbers in the rankings table; the full history below shows every filing (buys, sells and older activity).
| Insider | Action | Shares | Avg Cost | Total | Δ Holdings | Held After | Date | Grade | Form 4 |
|---|---|---|---|---|---|---|---|---|---|
| SCULLY WILLIAM P Other | Buy | 10,000 | $8.46 | $84.57K | 1.0% | 1,037,000 | Oct 14, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 100,000 | $8.35 | $835.48K | 10.8% | 1,027,000 | Oct 13, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 90,000 | $8.57 | $770.90K | 20.5% | 529,000 | Oct 8, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 125,000 | $8.40 | $1.05M | 39.8% | 439,000 | Oct 7, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 100,000 | $8.57 | $857.24K | 46.7% | 314,000 | Oct 2, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 162,000 | $8.68 | $1.41M | 312% | 214,000 | Sep 29, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 103,500 | $8.60 | $889.87K | 124% | 187,000 | Sep 28, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 100,000 | $8.43 | $843.46K | 12.1% | 927,000 | Sep 18, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 27,000 | $9.47 | $255.74K | 3.4% | 827,000 | Sep 2, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 50,000 | $8.79 | $439.43K | 6.7% | 800,000 | Aug 20, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Gift | 627,553 | — | — | 45.6% | 750,000 | Aug 18, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Gift | 336,000 | — | — | 32.3% | 1,377,553 | Aug 17, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Gift | 251,553 | — | — | 31.8% | 1,041,553 | Aug 10, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 34,000 | $8.62 | $293.05K | 4.5% | 790,000 | Aug 7, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 3,500 | $8.62 | $30.17K | 4.4% | 83,500 | Aug 7, 2026 | — | Form 4 |
| Isaacs Michael John Other | Sell | 8,386 | $8.47 | $71.06K | 19.0% | 35,745 | Jul 29, 2026 | — | Form 4 |
| Kingston Anne Evans Other | Sell | 7,662 | $8.47 | $64.92K | 12.1% | 55,782 | Jul 29, 2026 | — | Form 4 |
| Nguyen Tran CFO | Option exercise | 57,000 | — | — | 142% | 97,205 | Jul 28, 2026 | — | Form 4 |
| Zago Wagner M. Other | Option exercise | 51,000 | — | — | 150% | 85,000 | Jul 28, 2026 | — | Form 4 |
| Walker Karin L Other | Option exercise | 15,000 | — | — | 150% | 25,000 | Jul 28, 2026 | — | Form 4 |
| Swanson Chad J. Other | Option exercise | 51,000 | — | — | 150% | 85,000 | Jul 28, 2026 | — | Form 4 |
| Swanson Chad J. Other | Tax withheld | 3,467 | $8.56 | $29.68K | 7.8% | 40,733 | Jul 28, 2026 | — | Form 4 |
| Smith Brandon S. COO | Option exercise | 78,000 | — | — | 150% | 130,000 | Jul 28, 2026 | — | Form 4 |
| Kinney Gene G. CEO | Option exercise | 84,000 | — | — | 122% | 152,793 | Jul 28, 2026 | — | Form 4 |
| Isaacs Michael John Other | Tax withheld | 4,694 | $8.56 | $40.18K | 9.6% | 44,131 | Jul 28, 2026 | — | Form 4 |
| Kingston Anne Evans Other | Tax withheld | 3,498 | $8.56 | $29.94K | 5.2% | 63,444 | Jul 28, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 20,000 | $7.90 | $158.00K | 2.7% | 756,000 | Jun 16, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Gift | 325,000 | — | — | 30.6% | 736,000 | Jun 15, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 125,000 | $8.17 | $1.02M | 13.4% | 1,061,000 | Jun 11, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 50,000 | $9.31 | $465.50K | 5.6% | 936,000 | Jun 4, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 50,000 | $9.43 | $471.50K | 6.0% | 886,000 | Jun 2, 2026 | — | Form 4 |
| SCULLY WILLIAM P Other | Buy | 100,000 | $9.81 | $981.00K | 13.6% | 836,000 | May 22, 2026 | — | Form 4 |
What these mean— the action is the SEC’s own Form 4 transaction code. Only a buy or a sell is an open-market trade; the rest are transfers, awards and exercises, which is why they carry no price.
- Buy (P) — Open-market or private purchase
- Sell (S) — Open-market or private sale
- Tax withheld (F) — Shares withheld to pay tax or an exercise price
- Option exercise (M) — Exercise or conversion of an exempt derivative
- Gift (G) — Bona fide gift
Disclaimer — Informational only — not investment advice. Insider transaction data is sourced from SEC Form 4 filings; market data from public feeds and may be delayed. The Insider Score is a proprietary score for research purposes and does not predict future performance. Always do your own research.