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Prothena Corporation plc (PRTA) Total Return Calculator with Dividends Reinvested

Prothena Corporation plc

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The total return for Prothena Corporation plc (PRTA) stock is +52.11% over the past 12 months. So far it's up 21.52% this year. The 5-year total return is -52.75%, meaning $10,000 invested in PRTA stock 5 years ago would be worth $4,725 today. Total return includes price appreciation plus reinvesting any dividends paid out.

If you invested $10,000 in PRTA 1 year ago, it would be worth $15,336 today — you'd have gained $5,336.

With Dividends Reinvested$15,336+53.36%

Price Only (No DRIP)$15,336+53.36%

Period2025-05-07 → 2026-05-06

Price

Total Return (DRIP)

S&P 500

If You Invested $10,000 in PRTA

1Y$15,211+$5,211 (+52.1%)52.1% CAGR

3Y$1,454-$8,546 (-85.5%)-47.4% CAGR

5Y$4,725-$5,275 (-52.7%)-13.9% CAGR

10Y$2,918-$7,082 (-70.8%)-11.6% CAGR

15Y$15,528+$5,528 (+55.3%)3.0% CAGR

20Y$15,528+$5,528 (+55.3%)2.2% CAGR

30Y$15,528+$5,528 (+55.3%)1.5% CAGR

Prothena Corporation plc did not pay dividends during this period. Total return = price return.

Loading PRTA total return...

As of 2026-05-07

Returns at a Glance

Period	Total Return	CAGR	Price Only	Div. Contrib.	$10K →
YTD	+21.52%	—	+21.52%	—	$12,152
1Y	+52.11%	52.11%	+52.11%	—	$15,211
3Y	-85.46%	-47.42%	-85.46%	—	$1,454
5Y	-52.75%	-13.92%	-52.75%	—	$4,725
10Y	-70.82%	-11.59%	-70.82%	—	$2,918
15Y	+55.28%	2.98%	+55.28%	—	$15,528
20Y	+55.28%	2.22%	+55.28%	—	$15,528
30Y	+55.28%	1.48%	+55.28%	—	$15,528

Risk & Highlights

Best Year+301.63%2021

Worst Year-72.75%2018

Max Drawdown-47.48%2025-05-12 → 2025-05-27 · Recovered 2025-08-06

Annual Returns

Year	Total Return	Price Return	Div.	S&P 500	vs S&P
2026YTD	-5.76%	-5.76%	—	+0.41%	-6.2pp
2025	-30.14%	-30.14%	—	+16.64%	-46.8pp
2024	-64.06%	-64.06%	—	+24.00%	-88.1pp
2023	-32.07%	-32.07%	—	+24.81%	-56.9pp
2022	+22.41%	+22.41%	—	-19.95%	+42.4pp

PRTA outperformed the S&P 500 by 20.79pp over the past year (+52.11% vs +31.32%).

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PRTA Peers' Total Return

Accurate peer set · 10 comparable names

Name	Mkt Cap	30D Rtn	YTD Total Rtn	1Y Total Rtn	Div Contrib	3Y Total Rtn	5Y Total Rtn	10Y Total Rtn
PRTAProthena Corporation plc	$602M	+11.4%	+21.5%	+52.1%	—	-85.5%	-52.7%	-70.8%
FOLDAmicus Therapeutics, Inc.	$4.5B	+0.3%	+1.5%	+134.1%	—	+19.0%	+50.9%	+125.0%
RAREUltragenyx Pharmaceutical Inc.	$2.5B	+13.4%	+9.9%	-26.0%	—	-44.9%	-77.6%	-58.9%
IONSIonis Pharmaceuticals, Inc.	$12.7B	+3.4%	-3.5%	+141.2%	—	+118.4%	+105.9%	+126.0%
ALNYAlnylam Pharmaceuticals, Inc.	$40.4B	-8.3%	-24.3%	+12.3%	—	+44.3%	+129.4%	+445.5%
RCUSArcus Biosciences, Inc.	$2.6B	+16.9%	+11.6%	+220.2%	—	+31.0%	-13.7%	+52.9%
BIIBBiogen Inc.	$28.2B	+10.6%	+7.2%	+63.2%	—	-39.3%	-29.9%	-27.7%
REGNRegeneron Pharmaceuticals, Inc.	$74.9B	-5.5%	-7.0%	+29.7%	+0.6pp	-3.6%	+45.4%	+96.0%
ARVNArvinas, Inc.	$656M	-8.6%	-10.5%	+47.6%	—	-58.4%	-83.8%	-36.1%
NTLAIntellia Therapeutics, Inc.	$1.6B	+4.1%	+50.4%	+91.0%	—	-67.9%	-79.2%	-37.3%
BEAMBeam Therapeutics Inc.	$3.3B	+33.4%	+19.1%	+102.2%	—	-3.0%	-53.9%	+72.4%

Compare:PRTA vs FOLD PRTA vs RARE PRTA vs IONS PRTA vs FOLD vs RARE

About PRTA Dividend Returns

Prothena Corporation plc (PRTA) does not currently pay dividends. Many growth-focused companies reinvest profits back into the business rather than distributing them as dividends.

How We Calculate Total Return

Our total return calculator simulates dividend reinvestment (DRIP) by assuming each dividend payment is used to purchase additional shares at the closing price on the ex-dividend date. This methodology provides an accurate representation of how a dividend reinvestment plan would perform.

Frequently Asked Questions

Q1What is the total return of PRTA over the past year?

Prothena Corporation plc (PRTA) delivered a return of 52.11% over the past year. Since PRTA does not currently pay dividends, the total return equals the price-only return.

Q2How much would $10,000 invested in PRTA be worth today?

A $10,000 investment in Prothena Corporation plc one year ago would be worth $15,211 today, representing a gain of $5,211.

Q3Does PRTA pay dividends?

Prothena Corporation plc (PRTA) does not currently pay dividends. Many growth-focused companies reinvest profits back into the business rather than distributing them as dividends. For PRTA, the total return equals the price-only return.

Q4Did PRTA beat the S&P 500?

Yes, Prothena Corporation plc (PRTA) outperformed the S&P 500 by 20.79 percentage points over the past year. PRTA delivered a total return of 52.11%, compared to the S&P 500's 31.32%. This 20.79pp alpha means investors in PRTA earned more than a passive S&P 500 index fund.

Q5What is PRTA's worst drawdown?

Prothena Corporation plc (PRTA) experienced a maximum drawdown of -47.48% over the past year, declining from its peak on 2025-05-12 to its trough on 2025-05-27. The stock recovered to its prior peak by 2025-08-06. Maximum drawdown measures the worst peak-to-trough decline and is an important risk metric for investors.

Q6What is PRTA's long-term total return over 10, 20, or 30 years?

Here are Prothena Corporation plc (PRTA)'s long-term returns with dividends reinvested. Over 10 years, the total return is -70.8% (-11.6% CAGR) — $10,000 would have grown to $2,918. Over 20 years: 55.3% total return (2.2% CAGR) — $10,000 → $15,528. Over 30 years: 55.3% total return (1.5% CAGR) — $10,000 → $15,528. Long-term investors benefit from compounding: dividends buy additional shares, which generate their own dividends, creating an exponential growth effect.

Q7What was PRTA's best and worst year?

Prothena Corporation plc's best calendar year was 2021 with a total return of 301.6%. Its worst year was 2018 with a total return of -72.8%. This range shows the volatility investors should expect — the difference between the best and worst year is 374.4 percentage points.