Prothena Corporation Stock Forecast

Stock Price Forecast

According to 6 analysts polled by S&P Global, Prothena Corporation stock has a consensus rating of "Hold" and an average price target of $21.4. The average 1-year stock price forecast is 141.26% higher than the current stock price, while the lowest is $8.00 (-9.81%) and the highest is $36 (+305.86%).

Price Target: $21.4 (+141.26%)

Analyst Consensus: Hold

Price Target

Chart

Target	Low	Average	Median	High
Price	$8.00	$21.4	$20	$36
Change	-9.81%	+141.26%	+125.48%	+305.86%

* Price targets were last updated on Aug 7, 2026.

Analyst Ratings

The average analyst rating for Prothena Corporation stock is "Hold". This means that analysts believe this stock is likely to perform similarly to the overall market.

Recommendation Trends

Chart

Rating	Dec '25	Feb '26	Mar '26	May '26	Jul '26	Aug '26
Strong Buy	2	2	1	1	1	1
Buy	2	2	2	2	2	2
Hold	2	2	2	2	2	2
Sell	1	1	1	1	1	1
Strong Sell	0	0	0	0	0	0
Total	7	7	6	6	6	6

Latest Forecasts

Analyst	Firm	Rating	Rating	Action	Price Target	Upside	Date
Tazeen Ahmad Bank of America Securities	Bank of America Securities	Sell Maintains n/a	Sell	Maintains	n/a	n/a	Aug 14, 2026
Yasmeen Rahimi Piper Sandler	Piper Sandler	Buy Maintains $36	Buy	Maintains	$36	+305.86%	Aug 7, 2026
Brian Abrahams RBC Capital	RBC Capital	Hold Maintains $13	Hold	Maintains	$13	+46.56%	Aug 7, 2026
Andrew Fein H.C. Wainwright	H.C. Wainwright	Buy Reiterates $30	Buy	Reiterates	$30	+238.22%	Aug 7, 2026
Jason Butler Citizens JMP	Citizens JMP	Buy Maintains $19 → $20	Buy	Maintains	$19 → $20	+125.48%	May 8, 2026

More Analyst Ratings

Financial Forecast

Revenue This Year

83.16M

from 9.68M

758.69%

from 9.68M

Revenue Next Year

24.38M

from 83.16M

-70.69%

from 83.16M

EPS This Year

-0.55

from -3.98

EPS Next Year

-1.52

from -0.55

Fiscal Year	FY 2021	FY 2022	FY 2023	FY 2024	FY 2025	FY 2026
Period Ending	Dec 31, 2021	Dec 31, 2022	Dec 31, 2023	Dec 31, 2024	Dec 31, 2025	Dec 31, 2026
Revenue	200.58M	53.91M	91.37M	135.16M	9.68M	83.16M
Revenue Growth	23,414.30%	-73.13%	69.50%	47.92%	-92.84%	758.69%
Operating Income	71.98M	-131.56M	-191.04M	-154.56M	-184.56M	7.27M
Net Income	66.98M	-116.95M	-147.03M	-122.31M	-244.09M	6.22M
EPS	-	-	-	-	-3.98	-0.55
Free Cash Flow	75.55M	-37.44M	-80.02M	-53.50M	-78.53M	1.88M
No. Analysts	-	-	-	-	-	6

EPS and Forward PE are based on non-GAAP adjusted numbers.

Revenue Forecast

Chart

Revenue	2026	2027	2028
High	107.1M
Avg	83.2M
Low	52.1M

Revenue Growth

Chart

Revenue Growth	2026	2027	2028
High	1,005.9%
Avg	758.7%
Low	438.0%

EPS Forecast

Chart

EPS	2026	2027	2028
High	-0.55
Avg	-0.55
Low	-0.55

EPS Growth

Chart

EPS Growth	2026	2027	2028
High	-
Avg	-
Low	-