PRTA EFFECT SEC Filing Analysis

Final — all horizons settled through T+60d

PRTA ▲ +7.16% at T+60d

NEUTRAL call ✓ call won +7.16% · α vs SPY -3.16% · entry $9.36 → $10.03

Last close $8.56 (close Jun 8) · -8.55% from $9.36 entry

Entry anchored
Mar 2, 03:59 PM ET
via Databento tick

T+1d

+5.34%

call +5.34% · α +4.58%

$9.86

settled 3mo ago

T+5d

+4.38%

call +4.38% · α +4.86%

$9.77

settled 3mo ago

T+20d

+3.85%

call +3.85% · α +8.25%

$9.72

settled 2mo ago

T+60d

+7.16%

call +7.16% · α -3.16%

$10.03

settled 13d ago

Price Chart

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Executive Summary

Analysis based on filing metadata only — document content was unavailable. This is an EFFECT filing, indicating that a previously filed registration statement (likely a shelf registration) has become effective, allowing Prothena to issue securities immediately. No financial details or offering terms are available in the provided documents.

Actionable Insight

Monitor for a subsequent pricing or prospectus supplement filing that would disclose offering size, price, and timing. The effectiveness creates potential for near-term share issuance, which could lead to dilution if equity is sold.

Key Facts

EFFECT filing indicates a registration statement has become effective as of March 2, 2026
SEC File Number: 333-277290, suggesting this relates to a prior Form S-3 or F-3 registration
Company is based in Dublin, Ireland and operates in the life sciences sector
No offering size, pricing, or use of proceeds disclosed in available documents
Filing does not indicate whether this is an IPO, follow-on, or shelf takedown

Financial Impact

Not specified

dilutioncash

Risk Factors

Potential for unexpected equity issuance under the shelf registration, leading to dilution
Lack of transparency on offering terms increases uncertainty for shareholders

Market Snapshot

Exchange

Nasdaq

Documents Analyzed

This report is based on 3 SEC documents filed with EDGAR.

Document	Accession Number
EFFECT Filing (Primary)	9999999995-26-000697
Document: 9999999995-26-000697-index.html	9999999995-26-000697
Document: 9999999995-26-000697.txt	9999999995-26-000697

4 reports for PRTA

T+1T+5T+20T+60

Track record builds as more directional reports settle.

Filters

Reports for PRTA — sortable, filterable
	Type				Now
May 14, 2026 26d ago	3 NEUTRAL ★ 2/10	$9.76 $9.83	▲ +0.72%	▼ −0.25%	$8.56 (−12.30%)
May 7, 2026 4w ago	8-K BULLISH ★ 8/10	$10.73 $9.86	▼ −8.11%	▼ −9.57%	$8.56 (−20.22%)
Mar 27, 2026 10w ago	DEFA14A NEUTRAL ★ 3/10	$9.25 $10.36	▲ +12.00%	▲ +7.70%	$8.56 (−7.46%)
Mar 3, 2026 14w ago	EFFECT NEUTRAL ★ 3/10	$9.36 $9.77	▲ +4.38%	▲ +4.86%	$8.56 (−8.55%)

US Market Status

Market Closed — Opens in 7h

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