Prothena (PRTA) insider trading in the last 6 months

Form 4 filings, newest first

Quality Score today 0

One insider bought $12.1M. No sales.

BuyWilliam P. Scully$819K10% ownerat $8.19 on Oct 22, filed Oct 26

BuyWilliam P. Scully10% owner$819Kat $8.19 on Oct 22, filed Oct 26

BuyWilliam P. Scully$404K10% ownerat $8.07 on Oct 23, filed Oct 26

BuyWilliam P. Scully10% owner$404Kat $8.07 on Oct 23, filed Oct 26

BuyWilliam P. Scully$835K10% ownerat $8.35 on Oct 13, filed Oct 15

BuyWilliam P. Scully10% owner$835Kat $8.35 on Oct 13, filed Oct 15

From SEC Form 4s, the newest filed Oct 26, 2026 · Insiders have 2 business days to file a trade

16 more filings on PRTA in the last 6 months, for Pro members. See them free →

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Questions about PRTA's insider trades

As of Nov 2, 2026: Prothena (PRTA) has 19 insider filings on record in the last 6 months, the newest filed Oct 26, 2026. Its Quality Score is 0 (Below Average). Scores as of 7:55 PM ET, 15 minutes behind.

Are PRTA insiders buying or selling?

One insider bought $12.1M across 19 filings in the last 6 months. No open-⁠market sales on record. The newest filing: William P. Scully, 10% owner, bought $819K on Oct 22, 2026.

Who are PRTA's biggest insider sellers?

No PRTA insider sold shares on the open market in the last 6 months, as filed on Form 4.

When did a PRTA insider last buy?

William P. Scully, 10% owner, bought PRTA shares ($819K) on Oct 22, 2026, filed Oct 26, 2026, the newest insider buy on record.

Prothena's page has its Quality Score, its chart, and its earnings. More in Healthcare and Pharma. PRTA is on insider buys, Oct 26 to Nov 1, 2026.