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PRTA — structural market context

Prothena Corporation plc Ordin

Structural market context from public regulatory and market data, shown with its as-of dates. Descriptive only: nothing on this page is a recommendation, a prediction, or advice to buy or sell any security.

PRTA short interest & days to cover

SHARES SHORT

8.2M

% OF FLOAT

—

DAYS TO COVER

14.0

CHANGE VS PRIOR

-0.3%

FINRA consolidated short interest, reported twice a month and published ~2 weeks after each settlement date. % of float uses reported free float. · as of 2026-07-31 (40d ago)

PRTA fails-to-deliver (FTD)

Settlement date	Failed shares	Price
2026-08-06 · 34d	368	$8.49
2026-08-03 · 37d	8K	$8.12
2026-07-30 · 41d	1	$8.56

SEC fails-to-deliver files, published twice a month with ~6 weeks of delay.

PRTA insider buying and selling (Form 4)

Last 12 months, open-market only: 2 purchases · 0 sales

Insider	Type	Shares	Value	Filed
SCULLY WILLIAM P · 10 percent owner	Buy (P)	27K	$256K	2026-09-03
SCULLY WILLIAM P · 10 percent owner	Buy (P)	50K	$439K	2026-08-21

SEC Form 4 filings, open-market purchases and sales only (codes P and S); grants and option exercises excluded. Attributed public records.

Frequently asked questions

Are insiders buying PRTA?

In the last 12 months of SEC Form 4 filings, PRTA recorded 2 open-market insider purchases and 0 open-market sales (codes P and S; grants and option exercises excluded). These are attributed public records — information, not instruction.

Is this page telling me to buy or sell PRTA?

No. Everything on this page is descriptive, structural market context from public data, shown with its as-of dates. TradeAI News does not issue directional recommendations, price predictions, or buy/sell advice — for any ticker.

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Not financial advice. Trading involves risk. Descriptive structural context, never a recommendation.