SEP 29·SEC EDGARMed
SCULLY WILLIAM P purchased $890K of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 103,500 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.60 ($0.89M total) on 2026-09-28.
StockNASDAQ · US · USDHealthcare · Biotechnology
$PRTA
PROTHENA CORP PUBLIC LTD CO
Price · $PRTAvia TradingView
AI sentiment · 7d1 articles
- Bullish
- 0
- Neutral
- 1
- Bearish
- 0
Insider · 30dAll trades →
- Buys
- $2.0M 3 txs
- Sells
- — 0 txs
SCULLY WILLIAM P3× · $2.0M
10b5-1 share of filings0%
Top stories · $PRTAMore →
SEP 24·quiverquant.com
Insider Stock Purchases: September 24, 2026
On September 24, 2026, insiders made notable stock purchases: CAPSOVISION ($CV) insider bought 878,735 shares for $5M; NAYAX ($NYAX) CEO bought 104,511 shares for $4.6M; UXIN ($UXIN) insider bought 104.9M shares for $996K; PROTHENA ($PRTA) insider bought 100,000 shares for $843K; BRADESCO ($BBD) executive bought 43,620 shares for $784K.
SEP 21·SEC EDGAR
SCULLY WILLIAM P purchased $843K of PRTA
SCULLY WILLIAM P purchased 100,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.43 ($0.84M total) on 2026-09-18.
PRTA sentiment & insider activity
Over the past 7 days, AlphAI's AI scored 1 news story mentioning PRTA (PROTHENA CORP PUBLIC LTD CO). Coverage has been balanced: 0 bullish, 1 neutral, and 0 bearish.
Recent PRTA coverage spans insider activity, earnings and financial news.
In the last 30 days, PRTA insiders filed 3 SEC Form 4 transactions — 3 purchases ($2.0M) and no sales. The most active reporter was SCULLY WILLIAM P with 3 filings.
What's driving PRTA
Insider buying suggests confidence and may trigger short covering or buying pressure.
C‑suite insider purchase suggests confidence, but the transaction size is modest.
Minor ownership increase for a 10% owner; unlikely to move price materially.
Small insider purchase may signal confidence but size is modest relative to market cap.
Small insider purchase may signal confidence but limited price impact.
AlphAI scores every news story that mentions PRTA with an AI model for sentiment and relevance, and aggregates insider trades from PROTHENA CORP PUBLIC LTD CO's SEC EDGAR Form 4 filings. Figures refresh continuously.
News on $PRTA
Score
SCULLY WILLIAM P purchased $890K of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 103,500 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.60 ($0.89M total) on 2026-09-28.
1 min read
Insider Stock Purchases: September 24, 2026
On September 24, 2026, insiders made notable stock purchases: CAPSOVISION ($CV) insider bought 878,735 shares for $5M; NAYAX ($NYAX) CEO bought 104,511 shares for $4.6M; UXIN ($UXIN) insider bought 104.9M shares for $996K; PROTHENA ($PRTA) insider bought 100,000 shares for $843K; BRADESCO ($BBD) executive bought 43,620 shares for $784K.
2 min readSCULLY WILLIAM P purchased $843K of PRTA
SCULLY WILLIAM P purchased 100,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.43 ($0.84M total) on 2026-09-18.
1 min readSCULLY WILLIAM P purchased $256K of PRTA
SCULLY WILLIAM P purchased 27,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $9.47 ($0.26M total) on 2026-09-02.
1 min readSCULLY WILLIAM P purchased $439K of PRTA
SCULLY WILLIAM P purchased 50,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.79 ($0.44M total) on 2026-08-20.
1 min readSCULLY WILLIAM P purchased $30K of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 3,500 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.62 on 2026-08-07.
1 min readSCULLY WILLIAM P purchased $293K of PRTA
SCULLY WILLIAM P purchased 34,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.62 ($0.29M total) on 2026-08-07.
1 min read
PRTA's Q2 Loss Narrower Than Expected, Pipeline Progress in Focus
Prothena (PRTA) reported Q2 2026 adjusted loss per share of 32 cents, narrower than the Zacks estimate of a 39-cent loss. Revenues were $1.01 million versus $4.4 million a year earlier, mainly collaboration revenue from Bristol Myers Squibb (BMY) for PRX019. Prothena had $330.3 million cash, no debt, and reaffirmed 2026 net cash use guidance of $18-$23 million.
7 min readProthena Corporation plc: Prothena Reports Second Quarter 2026 Financial Results and Business Highlights
Prothena (NASDAQ:PRTA) reported Q2 2026 results and business updates. Quarter-end cash and restricted cash were $289.1M, with updated 2026 cash guidance to about $259M (midpoint). Q2 net loss was $18.6M. The company cited Roche Phase 2b PADOVA prasinezumab data in The Lancet and ongoing Phase 3 and other partner trials.
6 min readProthena Reports Second Quarter 2026 Financial Results and Business Highlights
PROTHENA CORP PUBLIC LTD CO (PRTA) filed an SEC Form 8-K — Results of Operations and Financial Condition. Exhibit 99.1 PRESS RELEASE Prothena Reports Second Quarter 2026 Financial Results an d Business Highlights • Net cash used in operating and investing activities was $25.7 million in the second quarter, and net cash provided by operating and investing activities was $3.2 million f
6 min read