OCT 15·SEC EDGARLow
SCULLY WILLIAM P purchased $920K of PRTA
SCULLY WILLIAM P purchased 110,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at an average of $8.36 ($8.35–$8.46, $0.92M total) across 2 trades over 2026-10-13 to 2026-10-14.
StockNASDAQ · US · USDHealthcare · Biotechnology
$PRTA
PROTHENA CORP PUBLIC LTD CO
Price · $PRTAvia TradingView
AI sentiment · 7d0 articles
No enriched coverage for $PRTA in the last 7 days.
Insider · 30dAll trades →
- Buys
- $5.9M 7 txs
- Sells
- — 0 txs
SCULLY WILLIAM P7× · $5.9M
10b5-1 share of filings0%
Top stories · $PRTAMore →
OCT 10·tipranks.com
Global-e, Immersion, Talos, Liquidia, Prothena Insider Shake-Up
Insiders at five companies made notable trades. Global-e's CEO and president sold shares worth $978,363 and $585,758, respectively. Immersion's director bought 41,000 shares for $292,799. Talos Energy's additional representative sold 480,000 shares for $8,136,000. Liquidia's director sold 235,477 shares for $6,386,136. Prothena's significant shareholder bought 315,000 shares for $2,677,400.
OCT 9·SEC EDGAR
SCULLY WILLIAM P purchased $1.8M of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 215,000 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at an average of $8.47 ($8.40–$8.57, $1.82M total) across 2 trades over 2026-10-07 to 2026-10-08.
PRTA sentiment & insider activity
Recent PRTA coverage spans insider activity, financial news and corporate actions.
In the last 30 days, PRTA insiders filed 7 SEC Form 4 transactions — 7 purchases ($5.9M) and no sales. The most active reporter was SCULLY WILLIAM P with 7 filings.
What's driving PRTA
The filing signals insider accumulation, but it is not a new operational or financial catalyst for PRTA.
Heavy insider buying could provide support and upside potential.
Insider buying may signal confidence and could provide modest upward pressure on the stock.
May generate modest bullish bias for PRTA.
Insider buying may signal positive outlook, modest upward pressure on the stock.
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 $920K of PRTA
SCULLY WILLIAM P purchased 110,000 shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at an average of $8.36 ($8.35–$8.46, $0.92M total) across 2 trades over 2026-10-13 to 2026-10-14.
2 min readGlobal-e, Immersion, Talos, Liquidia, Prothena Insider Shake-Up
Insiders at five companies made notable trades. Global-e's CEO and president sold shares worth $978,363 and $585,758, respectively. Immersion's director bought 41,000 shares for $292,799. Talos Energy's additional representative sold 480,000 shares for $8,136,000. Liquidia's director sold 235,477 shares for $6,386,136. Prothena's significant shareholder bought 315,000 shares for $2,677,400.
2 min readSCULLY WILLIAM P purchased $1.8M of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 215,000 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at an average of $8.47 ($8.40–$8.57, $1.82M total) across 2 trades over 2026-10-07 to 2026-10-08.
1 min read
Insider Stock Purchases: October 06, 2026
On October 6, 2026, 91 insider transactions were reported. Berkshire Hathaway bought 842,753 LENNAR CORP shares for $67.45M. BORR DRILLING LTD's Tor Olav Troim bought 1.5M shares. ANTERIS TECHNOLOGIES GLOBAL CORP's L1 Capital bought 648,455 shares. ACCELEVATION HOLDINGS CORP's CEO bought 200,000 shares. PROTHENA CORP's William P Scully bought 100,000 shares.
2 min readSCULLY WILLIAM P purchased $857K of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 100,000 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.57 ($0.86M total) on 2026-10-02.
1 min read
Chad J. Swanson to Resign as Prothena Chief Development Officer
Prothena announced that Chad J. Swanson, Ph.D., will resign as Chief Development Officer effective October 9, 2026, to join a strategic partner. The company did not disclose a replacement.
1 min readPROTHENA CORP PUBLIC LTD CO (PRTA): Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers
PROTHENA CORP PUBLIC LTD CO (PRTA) filed an SEC Form 8-K — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers. Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On October 2, 2026, Chad J. Swanson, Ph.D., Chief Development Officer of Prothena Corporation plc (the “Company”) notified
1 min readSCULLY WILLIAM P purchased $1.4M of PRTA (indirect holdings)
SCULLY WILLIAM P purchased 162,000 indirectly-held shares of PROTHENA CORP PUBLIC LTD CO (PRTA) at $8.68 ($1.41M total) on 2026-09-29.
1 min readSCULLY 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 read