$PRTA insider trading
Over the last 12 months, Prothena Corp Public insiders reported 11 buys totaling $5.8M and 8 sales totaling $2.9M across SEC Form 4 filings. 11% of those filings were made under pre-arranged 10b5-1 trading plans.
- Bought · 12m
- $5.8M 11 events
- Sold · 12m
- $2.9M 8 events
- Events · 12m
- 19 Form 4 filings, grouped
- Insiders · 12m
- 9 distinct reporters
- 10b5-1 share
- 11% of events, not dollars
All insider trades
Scroll the table sideways for price, value and marks.
| Date | Insider | Type | Shares | Avg price | Value | Δ stake | Marks |
|---|---|---|---|---|---|---|---|
| Sep 28, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 103,500 | $8.6 | $890K | +124% | indirect |
| Sep 18, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 100,000 | $8.43 | $843K | +12.1% | — |
| Sep 2, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 27,000 | $9.47 | $256K | +3.4% | — |
| Aug 20, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 50,000 | $8.79 | $439K | +6.7% | — |
| Aug 7, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 3,500 | $8.62 | $30K | +4.4% | indirect |
| Aug 7, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 34,000 | $8.62 | $293K | +4.5% | — |
| Jul 29, 2026 | Kingston Anne EvansChief Strategy Officer · O | ▼ Sale | 7,662 | $8.47 | $65K | -12.1% | plan |
| Jul 29, 2026 | Isaacs Michael JohnGeneral Counsel & Company Sec. · O | ▼ Sale | 8,386 | $8.47 | $71K | -19% | plan |
| Jul 28, 2026 | Zago Wagner M.Chief Scientific Officer · O | ▽ Sale to issuer | 51,000 | $8.56 | $437K | -60% | — |
| Jul 28, 2026 | Walker Karin LChief Accounting Officer · O | ▽ Sale to issuer | 15,000 | $8.56 | $128K | -60% | — |
| Jul 28, 2026 | Swanson Chad J.Chief Development Officer · O | ▽ Sale to issuer | 40,800 | $8.56 | $349K | -48% | — |
| Jul 28, 2026 | Smith Brandon S.Chief Operating Officer · O | ▽ Sale to issuer | 78,000 | $8.56 | $668K | -60% | — |
| Jul 28, 2026 | Nguyen TranChief Strategy Officer and CFO · O | ▽ Sale to issuer | 57,000 | $8.56 | $488K | -58.6% | — |
| Jul 28, 2026 | Kinney Gene G.President and CEO · O·D | ▽ Sale to issuer | 84,000 | $8.56 | $719K | -55% | — |
| Jun 16, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 20,000 | $7.9 | $158K | +2.7% | — |
| Jun 11, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 125,000 | $8.17 | $1.0M | +13.4% | — |
| Jun 4, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 50,000 | $9.31 | $465K | +5.6% | — |
| Jun 2, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 50,000 | $9.43 | $471K | +6% | — |
| May 22, 2026 | SCULLY WILLIAM P10% | ▲ Buy | 100,000 | $9.81 | $981K | +13.6% | — |
Every $PRTA filing on this page is one API call away
The same Form 4 data over REST or MCP, already grouped into events with the plan flag and the dollar value read. A free key does 100 calls a day and needs no card. Prefer email? Prothena Corp Public filings can reach your inbox instead.
Corporate insiders — officers, directors and 10%+ owners — must report their trades to the SEC on Form 4 within two business days. This page shows open-market activity: purchases (code P), sales (S) and dispositions back to the issuer (D). Scheduled compensation events such as stock grants and option exercises are also filed on Form 4 but carry no trading signal, so they are not shown and counts here can be lower than the raw EDGAR filing total. We group each filing's transactions into one economic event (a laddered 10b5-1 sale is one event, not 25 rows), flag pre-arranged plans and late filings, and link every event to its AI-scored article in the $PRTA feed.