Prothena earnings missed by $0.11, revenue fell short of estimates

Prothena (PRTA) reported Q3 EPS of -$0.32, missing estimates by $0.11, with revenue of $620K, below the $9.59M consensus. The stock is down 9.93% over 3 months and 25.28% over 12 months. InvestingPro rates its financial health as 'good performance'.

Original reporting
Published Nov 6, 2026, 6:18 AM UTC
Analysis
AlphAI AI DeskAI-generated
Added to AlphAI Nov 6, 2026, 6:27 AM UTC. Informational, not investment advice.
How this was made
AlphAI summarizes source reporting and applies a structured AI analysis for relevance, timing, sentiment and ticker impact. Always verify material claims with the original publisher.
AlphAI market briefEarnings
Primary signal
$PRTA
Bearish
medium confidence
Mentioned
$PRTA
Relevance
6/10
AlphAI data visualization · based on investing.com
Decision brief

The 30-second read

$PRTABearishMed
01

Why it matters

The earnings shortfall is likely to trigger a sell‑off, especially given the large revenue miss relative to expectations.

02

Market read

The news is relevant for traders focused on biotech micro‑caps and earnings‑driven price moves.

03

What to watch

Potential upcoming clinical trial data or partnership announcements not covered in this release.

Relevance 6/10Novelty 6/10Timing: post-market

Background

Prothena (NASDAQ: PRTA) is a small‑cap biotech company. The article reports its third‑quarter earnings, which missed consensus estimates.

Company-level read

Ticker impact

$PRTABearishMedium confidence
Context

Prothena reported Q3 EPS of -$0.32, missing estimates by $0.11 and revenue of $620K versus $9.59M consensus.

Expected impact

likely pressure as the market prices in the earnings shortfall

Evidence & confidence

Both EPS and revenue fell short of expectations, which typically triggers a sell-off for a micro‑cap biotech.

Market effects

Biotech sector may see modest pullback as earnings miss highlights revenue volatility.

Limited to US-listed micro‑cap biotech investors.

Low global relevance; impact confined to niche investors.

Counterpoint

If the miss is viewed as a temporary setback and pipeline progress remains strong, the stock could be a buying opportunity at lower levels.

Key entities

  • Prothena

    Biotech firm reporting Q3 results.

Related articles

$PRTAMedAI 8/10

Prothena Corporation plc: Prothena Reports Third Quarter 2026 Financial Results and Business Highlights

Prothena reported Q3 2026 net loss of $16.5M and 9M net loss of $2.4M, with $272.2M in cash. Coramitug showed reduced hsCRP in Phase 2 trial. Roche and Novo highlight prasinezumab and coramitug for Parkinson's and ATTR-CM. Phase 3 trials expected to complete in 2029. Prothena has $650M in upfront payments and potential $2.25B in milestones. Preclinical programs include TDP-43 CYTOPE and PRX012-TfR.

$PRTAMed

Prothena Reports Third 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 Third Quarter 2026 Financial Results an d Business Highlights • Net cash used in operating and investing activities was $12.0 million in the third quarter and net cash used in operating and investing activities was $8.9 million for the

$PRTAMed

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.

$PRTAMed

Prothena 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