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Prothena (PRTA)

(Delayed Data from NSDQ)

$6.81 USD

6.81
859,928

-0.06 (-0.87%)

Updated Aug 1, 2025 04:00 PM ET

After-Market: $6.80 -0.01 (-0.15%) 7:58 PM ET

Zacks Rank:

This is our short term rating system that serves as a timeliness indicator for stocks over the next 1 to 3 months. How good is it? See rankings and related performance below.

Zacks Rank Definition Annualized Return
1Strong Buy23.75%
2Buy17.82%
3Hold9.58%
4Sell5.28%
5Strong Sell2.61%
S&P50011.30%

Zacks Rank Education - Learn about the Zacks Rank

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3-Hold of 5     3    

Style Scores:

The Style Scores are a complementary set of indicators to use alongside the Zacks Rank. It allows the user to better focus on the stocks that are the best fit for his or her personal trading style.

The scores are based on the trading styles of Value, Growth, and Momentum. There's also a VGM Score ('V' for Value, 'G' for Growth and 'M' for Momentum), which combines the weighted average of the individual style scores into one score.

  • Value Score A
  • Growth Score A
  • Momentum Score A
  • VGM Score A

Within each Score, stocks are graded into five groups: A, B, C, D and F. As you might remember from your school days, an A, is better than a B; a B is better than a C; a C is better than a D; and a D is better than an F.

As an investor, you want to buy stocks with the highest probability of success. That means you want to buy stocks with a Zacks Rank #1 or #2, Strong Buy or Buy, which also has a Score of an A or a B in your personal trading style.

Zacks Style Scores Education - Learn more about the Zacks Style Scores

D Value F Growth F Momentum F VGM

Industry Rank:

The Zacks Industry Rank assigns a rating to each of the 265 X (Expanded) Industries based on their average Zacks Rank.

An industry with a larger percentage of Zacks Rank #1's and #2's will have a better average Zacks Rank than one with a larger percentage of Zacks Rank #4's and #5's.

The industry with the best average Zacks Rank would be considered the top industry (1 out of 265), which would place it in the top 1% of Zacks Ranked Industries. The industry with the worst average Zacks Rank (265 out of 265) would place in the bottom 1%.

Zacks Rank Education -- Learn more about the Zacks Rank
Zacks Industry Rank Education -- Learn more about the Zacks Industry Rank

Bottom 42% (143 out of 246)

Industry: Medical - Biomedical and Genetics

Zacks News

Zacks Equity Research

PTC Therapeutics (PTCT) Surges 11.2%: Is This an Indication of Further Gains?

PTC Therapeutics (PTCT) witnessed a jump in share price last session on above-average trading volume. The latest trend in earnings estimate revisions for the stock suggests that there could be more strength down the road.

Zacks Equity Research

Earnings Preview: Rhythm Pharmaceuticals, Inc. (RYTM) Q2 Earnings Expected to Decline

Rhythm Pharmaceuticals (RYTM) doesn't possess the right combination of the two key ingredients for a likely earnings beat in its upcoming report. Get prepared with the key expectations.

Zacks Equity Research

Roche Reports 7% 1H25 Sales Growth, Key Drugs Perform Well

RHHBY posts solid first-half 2025 growth on strong drug demand, but pipeline setbacks and biosimilar hits remain headwinds.

Zacks Equity Research

AstraZeneca's AL Amyloidosis Drug Misses Goal in Late-Stage Studies

AZN's anselamimab fails to meet key goals in late-stage AL amyloidosis trials despite signs of subgroup benefit.

Zacks Equity Research

PRTA Dives 53.5% YTD: Will the Restructuring Effort Boost Prospects?

Prothena slashes 63% of its workforce and axes birtamimab after trial failure, reshaping its pipeline and financial outlook. Shares plunge 53.5% YTD.

Zacks Equity Research

RHHBY to Advance Parkinson's Disease Drug to Late-Stage Development

Roche is set to advance prasinezumab into phase III for early Parkinson's, eyeing potential first-in-class disease-modifying therapy.

Zacks Equity Research

Prothena's Late-Stage Study for AL Amyloidosis Fails, Stock Down

PRTA shares drop 22% after ending birtamimab development as a phase III study fails to meet primary or secondary endpoints in AL amyloidosis.

Zacks Equity Research

Prothena Q1 Earnings Miss Estimates, Focus on Key Readouts in 2025

PRTA posts a wider-than-expected first-quarter loss. Investors will focus on important readouts on birtamimab and PRX012 later in 2025.

Zacks Equity Research

Prothena (PRTA) Reports Q1 Loss, Misses Revenue Estimates

Prothena (PRTA) delivered earnings and revenue surprises of -21.74% and 86.72%, respectively, for the quarter ended March 2025. Do the numbers hold clues to what lies ahead for the stock?

Zacks Equity Research

Biogen & Partner Eisai Get EU Nod for Alzheimer's Drug Leqembi

Following the nod in the EU, BIIB & Eisai's Leqembi becomes the first therapy to slow the progression of early Alzheimer's disease in the region.

Zacks Equity Research

Prothena Q4 Earnings Miss Estimates, Pipeline Progress in Focus

PRTA posts a wider-than-expected fourth-quarter loss. However, it reports encouraging pipeline progress for the quarter.

Zacks Equity Research

Prothena (PRTA) Reports Q4 Loss, Misses Revenue Estimates

Prothena (PRTA) delivered earnings and revenue surprises of -5.88% and 85.04%, respectively, for the quarter ended December 2024. Do the numbers hold clues to what lies ahead for the stock?

Zacks Equity Research

Biogen Stock Down on Regulatory Update in the EU for Alzheimer's Drug

The EC requests CHMP to reassess new safety data that emerged after the positive opinion recommending the approval of BIIB/Eisai's Leqembi in the EU for early AD.

Zacks Equity Research

Roche's 2024 Sales and Earnings Beat, Key Drugs Perform Well

RHHBY records impressive sales growth in 2024 on the back of strong demand for Vabysmo, Hemlibra, Phesgo and Ocrevus.

Zacks Equity Research

Nurix Therapeutics, Inc. (NRIX) Reports Q4 Loss, Lags Revenue Estimates

Nurix Therapeutics (NRIX) delivered earnings and revenue surprises of -11.94% and 22.55%, respectively, for the quarter ended November 2024. Do the numbers hold clues to what lies ahead for the stock?

Zacks Equity Research

BIIB Secures FDA Nod for Monthly Maintenance Dosing of Alzheimer's Drug

The FDA's approval is based on simulation data from multiple studies showing that maintenance dosing with Biogen???s Leqembi every four weeks prolongs biomarker benefits.

Zacks Equity Research

Roche's Prasinezumab Misses Goal in Parkinson's Disease Study

The phase IIb PADOVA study, evaluating Roche's prasinezumab in people with early-stage Parkinson's disease, misses the primary endpoint.

Zacks Equity Research

Why Is Prothena (PRTA) Down 17.9% Since Last Earnings Report?

Prothena (PRTA) reported earnings 30 days ago. What's next for the stock? We take a look at earnings estimates for some clues.

Zacks Equity Research

Biogen Partner Eisai Gets Positive CHMP Nod for Leqembi in Europe

The CHMP renders a positive opinion recommending approval for BIIB and Eisai's Leqembi for treating early Alzheimer's disease.

Zacks Equity Research

Prothena Q3 Earnings Beat Estimates, Pipeline Progress in Focus

PRTA posts a narrower-than-expected loss in the third quarter. The company also reports encouraging pipeline progress for the quarter.

Zacks Equity Research

Prothena (PRTA) Reports Q3 Loss, Misses Revenue Estimates

Prothena (PRTA) delivered earnings and revenue surprises of 6.78% and 53.81%, respectively, for the quarter ended September 2024. Do the numbers hold clues to what lies ahead for the stock?

Ahan Chakraborty headshot

Will These 5 Biotech Stocks Surpass Q3 Earnings Forecasts?

Let's look at five biotech and drug companies, AZN, NVAX, AXSM, TBPH and PRTA, slated to release their third-quarter 2024 results this week.

Zacks Equity Research

Prothena (PRTA) Upgraded to Buy: What Does It Mean for the Stock?

Prothena (PRTA) has been upgraded to a Zacks Rank #2 (Buy), reflecting growing optimism about the company's earnings prospects. This might drive the stock higher in the near term.

Zacks Equity Research

Strength Seen in Prothena (PRTA): Can Its 15.0% Jump Turn into More Strength?

Prothena (PRTA) witnessed a jump in share price last session on above-average trading volume. The latest trend in earnings estimate revisions for the stock doesn't suggest further strength down the road.

Zacks Equity Research

Eli Lilly Secures Approval for Alzheimer's Drug Kisunla in Japan

Japan is the second major market where LLY's Kisunla has been approved. The drug was first approved in the United States in July 2024.