3 ·Filed May 14, 2026

PRTA

PROTHENA CORP PUBLIC LTD CO
NEUTRAL
Impact 2/10
Horizonimmediate Processed4mo ago SEC0001045463-26-000003
Form 3 — initial insider ownership statement
Actionable Insight • Neutral

No trading signal. Monitor future Form 4 filings for any open-market purchases or sales by Scully, which would provide insight into insider sentiment.

DirectionNeutral
Confidencehigh
Horizonimmediate
Final — all horizons settled through T+60d
PRTA ▼ -5.53% at T+60d
NEUTRAL call ✗ call lost -5.53% · α vs SPY -10.05% · entry $9.76 → $9.22
Entry anchored
May 14, 2026
via day open
T+1d
-1.74%
call -1.74% · α -1.68%
$9.59
settled 5mo ago
T+5d
+0.72%
call +0.72% · α -0.25%
$9.83
settled 4mo ago
T+20d
-16.50%
call -16.50% · α -18.61%
$8.15
settled 4mo ago
T+60d
-5.53%
call -5.53% · α -10.05%
$9.22
settled 7w ago

Price Chart

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Executive Summary

William P. Scully filed a Form 3 initial statement of beneficial ownership, disclosing 736,000 ordinary shares held directly, 80,000 shares held by Manatee Equity Fund LLC, and 52,000 shares held by spouse. This is a routine administrative filing triggered by Scully's appointment as a director or officer, with no material financial impact.

Key Facts

  • William P. Scully filed Form 3 initial statement of beneficial ownership on 2026-05-14, reporting period 2026-05-07.
  • Direct holdings: 736,000 ordinary shares.
  • Indirect holdings: 80,000 shares via Manatee Equity Fund LLC, 52,000 shares via spouse.
  • Power of Attorney executed 2025-09-04 appointing Reid E. Buchanan, Diana L. Hayes, and Todd W. Fennell as attorneys-in-fact for SEC filings.

Financial Impact

No financial impact; Form 3 is a routine initial ownership disclosure.

Risk Factors

  • None from this filing; insider selling via Form 4 in the future could signal bearish sentiment.

Market Snapshot

Exchange
Nasdaq
Sector
Pharmaceutical Preparations
Analyst Consensus
67% bullish (12 analysts)

Investment Themes

Biotech & Drug Discovery

Documents Analyzed

This report is based on 4 SEC documents filed with EDGAR.

DocumentAccession Number
3 Filing (Primary)0001045463-26-000003
Document: 0001045463-26-000003-index-headers.html0001045463-26-000003
Document: 0001045463-26-000003-index.html0001045463-26-000003
Document: 0001045463-26-000003.txt0001045463-26-000003
10 reports for PRTA
Performance horizon
60% Hit rate 3 of 5 directional calls best @ T+60▲ +14.11%Jun 12, 2026
Filters
Rows
Reports for PRTA — sortable, filterable
TypeNow
Sep 3, 2026
28d ago
Insider Buy
NEUTRAL ★ 3/10
$9.82 $8.86▼ −9.78%▼ −8.57%$8.36 (−14.87%)
Aug 21, 2026
6w ago
Insider Buy
BULLISH ★ 4/10
$9.45 $9.33▼ −1.27%▼ −1.74%$8.36 (−11.53%)
Aug 10, 2026
7w ago
Insider Buy
BULLISH ★ 5/10
$9.12 $8.88▼ −2.63%▼ −2.58%$8.36 (−8.33%)
Jul 31, 2026
9w ago
Insider Cluster
NEUTRAL ★ 2/10
$8.12 $8.76▲ +7.88%▲ +4.37%$8.36 (+2.96%)
Jun 18, 2026
15w ago
Insider Buy
BULLISH ★ 5/10
$8.93 $9.27▲ +3.81%▲ +5.47%$8.36 (−6.38%)
Jun 12, 2026
15w ago
Insider Buy
BULLISH ★ 5/10
$8.15 $9.15▲ +12.27%▲ +13.65%$8.36 (+2.58%)
May 14, 2026
20w ago
3
NEUTRAL ★ 2/10
$9.76 $9.83▲ +0.72%▼ −0.25%$8.36 (−14.34%)
May 7, 2026
21w ago
8-K
BULLISH ★ 8/10
$10.73 $9.86▼ −8.11%▼ −9.57%$8.36 (−22.09%)
Mar 27, 2026
26w ago
DEFA14A
NEUTRAL ★ 3/10
$9.25 $10.36▲ +12.00%▲ +7.70%$8.36 (−9.62%)
Mar 3, 2026
30w ago
EFFECT
NEUTRAL ★ 3/10
$9.36 $9.77▲ +4.38%▲ +4.86%$8.36 (−10.68%)
Showing 10 of 10

US Market Status

Market Closed — Opens Mon (65h 25m)

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