Prothena Corp Public Ltd Co (PRTA) insider trading.
In Q3 2026, insiders at Prothena Corp Public Ltd Co reported 27 non-derivative transactions on 18 Forms 3, 4 and 5: 7 open-market purchases worth $4.2M and 2 sales worth $136K.
- Transactions
- 27
- Purchases (P)
- 7
- Sales (S)
- 2
- Net shares, P minus S
- 463,952
- Insiders
- 9
- Last filed
- 2026-09-30
Insiders
| Insider | Relationship | Transactions | Buys | Sales |
|---|---|---|---|---|
| Scully William P | TenPercentOwner | 10 | 7 | 0 |
| Swanson Chad J. | Officer · Chief Development Officer | 3 | 0 | 0 |
| Isaacs Michael John | Officer · General Counsel & Company Sec. | 2 | 0 | 1 |
| Kingston Anne Evans | Officer · Chief Strategy Officer | 2 | 0 | 1 |
| Kinney Gene G. | Director, Officer · President and CEO | 2 | 0 | 0 |
| Nguyen Tran | Officer · Chief Strategy Officer and CFO | 2 | 0 | 0 |
| Smith Brandon S. | Officer · Chief Operating Officer | 2 | 0 | 0 |
| Walker Karin L | Officer · Chief Accounting Officer | 2 | 0 | 0 |
| Zago Wagner M. | Officer · Chief Scientific Officer | 2 | 0 | 0 |
Transactions
| Date | Insider | Code | Shares | Price | Owned after | Filing |
|---|---|---|---|---|---|---|
| 2026-09-29 | Scully William P | P (A) | 162,000 | $8.68 | 214,000 | Form 4 |
| 2026-09-28 | Scully William P | P (A) | 103,500 | $8.6 | 187,000 | Form 4 |
| 2026-09-18 | Scully William P | P (A) | 100,000 | $8.43 | 927,000 | Form 4 |
| 2026-09-02 | Scully William P | P (A) | 27,000 | $9.47 | 827,000 | Form 4 |
| 2026-08-20 | Scully William P | P (A) | 50,000 | $8.79 | 800,000 | Form 4 |
| 2026-08-18 | Scully William P | G (D) | 627,553 | $0 | 750,000 | Form 4 |
| 2026-08-17 | Scully William P | G (A) | 336,000 | $0 | 1,377,553 | Form 4 |
| 2026-08-10 | Scully William P | G (A) | 251,553 | $0 | 1,041,553 | Form 4 |
| 2026-08-07 | Scully William P | P (A) | 3,500 | $8.62 | 83,500 | Form 4 |
| 2026-08-07 | Scully William P | P (A) | 34,000 | $8.62 | 790,000 | Form 4 |
| 2026-07-29 | Isaacs Michael John | S (D) | 8,386 | $8.47 | 35,745 | Form 4 |
| 2026-07-29 | Kingston Anne Evans | S (D) | 7,662 | $8.47 | 55,782 | Form 4 |
| 2026-07-28 | Isaacs Michael John | F (D) | 4,694 | $8.56 | 44,131 | Form 4 |
| 2026-07-28 | Kingston Anne Evans | F (D) | 3,498 | $8.56 | 63,444 | Form 4 |
| 2026-07-28 | Kinney Gene G. | M (A) | 84,000 | — | 152,793 | Form 4 |
| 2026-07-28 | Kinney Gene G. | D (D) | 84,000 | $8.56 | 68,793 | Form 4 |
| 2026-07-28 | Nguyen Tran | M (A) | 57,000 | — | 97,205 | Form 4 |
| 2026-07-28 | Nguyen Tran | D (D) | 57,000 | $8.56 | 40,205 | Form 4 |
| 2026-07-28 | Smith Brandon S. | M (A) | 78,000 | — | 130,000 | Form 4 |
| 2026-07-28 | Smith Brandon S. | D (D) | 78,000 | $8.56 | 52,000 | Form 4 |
| 2026-07-28 | Swanson Chad J. | M (A) | 51,000 | — | 85,000 | Form 4 |
| 2026-07-28 | Swanson Chad J. | F (D) | 3,467 | $8.56 | 40,733 | Form 4 |
| 2026-07-28 | Swanson Chad J. | D (D) | 40,800 | $8.56 | 44,200 | Form 4 |
| 2026-07-28 | Walker Karin L | D (D) | 15,000 | $8.56 | 10,000 | Form 4 |
| 2026-07-28 | Walker Karin L | M (A) | 15,000 | — | 25,000 | Form 4 |
| 2026-07-28 | Zago Wagner M. | D (D) | 51,000 | $8.56 | 34,000 | Form 4 |
| 2026-07-28 | Zago Wagner M. | M (A) | 51,000 | — | 85,000 | Form 4 |
Transaction codes in this quarter
Get PRTA insider transactions through the API
curl "https://sec-api.dev/api/v1/insider-transactions?period=2026q3&cik=1559053&limit=100" \
-H "Authorization: Bearer $SEC_API_KEY"Insider trading API guide · PRTA company page · Prothena Corp Public Ltd Co on SEC.gov
Questions
Are insiders buying or selling Prothena Corp Public Ltd Co (PRTA)?
In Q3 2026, insiders at Prothena Corp Public Ltd Co reported 27 non-derivative transactions on 18 Forms 3, 4 and 5: 7 open-market purchases worth $4.2M and 2 sales worth $136K. Grants, tax withholding and option exercises are counted as transactions but are not purchases or sales.
Where do these Prothena Corp Public Ltd Co insider trades come from?
From the SEC Insider Transactions Data Sets for Q3 2026, which republish the Forms 3, 4 and 5 filed on EDGAR. Each row links to its filing on SEC.gov.
Plain-text version for agents and LLMs: /insider-trading/prta.md
Independent. Not affiliated with, endorsed by, or sponsored by the U.S. Securities and Exchange Commission. Data is reproduced from public SEC filings and datasets. Not investment advice.