Stocks · Health care · Pharmaceutical Preparations

PROTHENA CORP PUBLIC LTD CO

PRTA Clue Score40
Ireland Fiscal year ends December CIK 0001559053
8.84
+2.67%
Close, 9 Oct 2026 · USD

Price, with every insider trade on it

Closing prices, 12 months · point at a dot for who traded, or at the line for the close
8.84 on 9 Oct 2026
12 10 8 Oct 2025 Apr 2026 Oct 2026 13 Oct 2025 $10.35 14 Oct 2025 $10.12 15 Oct 2025 $10.66 16 Oct 2025 $10.09 17 Oct 2025 $9.92 20 Oct 2025 $10.37 21 Oct 2025 $10.22 22 Oct 2025 $9.88 23 Oct 2025 $9.75 24 Oct 2025 $9.82 27 Oct 2025 $10.37 28 Oct 2025 $10.54 29 Oct 2025 $10.65 30 Oct 2025 $10.48 31 Oct 2025 $10.75 3 Nov 2025 $10.54 4 Nov 2025 $10.26 5 Nov 2025 $10.27 6 Nov 2025 $10.08 7 Nov 2025 $10.56 10 Nov 2025 $10.53 11 Nov 2025 $10.48 12 Nov 2025 $10.85 13 Nov 2025 $10.18 14 Nov 2025 $9.93 17 Nov 2025 $10.25 18 Nov 2025 $10.36 19 Nov 2025 $9.99 20 Nov 2025 $10.05 21 Nov 2025 $10.48 24 Nov 2025 $10.40 25 Nov 2025 $10.50 26 Nov 2025 $10.43 28 Nov 2025 $10.75 1 Dec 2025 $10.27 2 Dec 2025 $10.35 3 Dec 2025 $11.17 4 Dec 2025 $11.16 5 Dec 2025 $11.07 8 Dec 2025 $10.73 9 Dec 2025 $10.32 10 Dec 2025 $9.87 11 Dec 2025 $10.33 12 Dec 2025 $10.36 15 Dec 2025 $9.97 16 Dec 2025 $9.75 17 Dec 2025 $9.43 18 Dec 2025 $9.38 19 Dec 2025 $9.21 22 Dec 2025 $9.68 23 Dec 2025 $9.49 24 Dec 2025 $9.69 26 Dec 2025 $9.54 29 Dec 2025 $9.48 30 Dec 2025 $9.31 31 Dec 2025 $9.55 2 Jan 2026 $9.20 5 Jan 2026 $9.10 6 Jan 2026 $8.97 7 Jan 2026 $9.13 8 Jan 2026 $9.05 9 Jan 2026 $9.19 12 Jan 2026 $8.91 13 Jan 2026 $8.98 14 Jan 2026 $9.20 15 Jan 2026 $9.26 16 Jan 2026 $9.35 20 Jan 2026 $9.25 21 Jan 2026 $9.68 22 Jan 2026 $10.34 23 Jan 2026 $10.00 26 Jan 2026 $9.94 27 Jan 2026 $9.73 28 Jan 2026 $9.14 29 Jan 2026 $9.06 30 Jan 2026 $8.81 2 Feb 2026 $8.91 3 Feb 2026 $8.78 4 Feb 2026 $8.89 5 Feb 2026 $8.35 6 Feb 2026 $8.91 9 Feb 2026 $8.86 10 Feb 2026 $8.96 11 Feb 2026 $8.93 12 Feb 2026 $8.85 13 Feb 2026 $8.96 17 Feb 2026 $8.96 18 Feb 2026 $9.09 19 Feb 2026 $9.03 20 Feb 2026 $9.02 23 Feb 2026 $9.07 24 Feb 2026 $8.97 25 Feb 2026 $8.88 26 Feb 2026 $8.64 27 Feb 2026 $8.67 2 Mar 2026 $9.40 3 Mar 2026 $9.36 4 Mar 2026 $9.86 5 Mar 2026 $9.46 6 Mar 2026 $9.59 9 Mar 2026 $9.81 10 Mar 2026 $9.77 11 Mar 2026 $9.58 12 Mar 2026 $9.31 13 Mar 2026 $9.21 16 Mar 2026 $9.17 17 Mar 2026 $9.00 18 Mar 2026 $8.59 19 Mar 2026 $8.54 20 Mar 2026 $8.75 23 Mar 2026 $8.82 24 Mar 2026 $8.73 25 Mar 2026 $9.31 26 Mar 2026 $9.52 27 Mar 2026 $9.26 30 Mar 2026 $9.25 31 Mar 2026 $9.72 1 Apr 2026 $10.03 2 Apr 2026 $9.86 6 Apr 2026 $10.04 7 Apr 2026 $10.36 8 Apr 2026 $10.65 9 Apr 2026 $10.58 10 Apr 2026 $10.50 13 Apr 2026 $10.31 14 Apr 2026 $10.61 15 Apr 2026 $10.82 16 Apr 2026 $10.52 17 Apr 2026 $10.90 20 Apr 2026 $10.79 21 Apr 2026 $10.67 22 Apr 2026 $10.72 23 Apr 2026 $10.73 24 Apr 2026 $10.75 27 Apr 2026 $10.79 28 Apr 2026 $11.51 29 Apr 2026 $10.87 30 Apr 2026 $11.06 1 May 2026 $10.64 4 May 2026 $10.79 5 May 2026 $11.19 6 May 2026 $11.18 7 May 2026 $10.52 8 May 2026 $10.73 11 May 2026 $9.67 12 May 2026 $9.43 13 May 2026 $9.60 14 May 2026 $9.86 15 May 2026 $9.76 18 May 2026 $9.59 19 May 2026 $9.07 20 May 2026 $9.35 21 May 2026 $9.41 22 May 2026 $9.83 26 May 2026 $10.06 27 May 2026 $10.03 28 May 2026 $9.98 29 May 2026 $10.18 1 Jun 2026 $9.59 2 Jun 2026 $9.19 3 Jun 2026 $8.92 4 Jun 2026 $9.25 5 Jun 2026 $8.79 8 Jun 2026 $8.56 9 Jun 2026 $8.47 10 Jun 2026 $7.91 11 Jun 2026 $8.26 12 Jun 2026 $8.25 15 Jun 2026 $8.15 16 Jun 2026 $8.29 17 Jun 2026 $8.49 18 Jun 2026 $8.93 22 Jun 2026 $9.15 23 Jun 2026 $9.55 24 Jun 2026 $9.40 25 Jun 2026 $9.27 26 Jun 2026 $10.02 29 Jun 2026 $9.97 30 Jun 2026 $9.79 1 Jul 2026 $9.58 2 Jul 2026 $9.69 6 Jul 2026 $9.50 7 Jul 2026 $9.68 8 Jul 2026 $9.85 9 Jul 2026 $9.64 10 Jul 2026 $9.24 13 Jul 2026 $8.83 14 Jul 2026 $8.64 15 Jul 2026 $8.43 16 Jul 2026 $8.47 17 Jul 2026 $8.66 20 Jul 2026 $8.67 21 Jul 2026 $8.75 22 Jul 2026 $8.44 23 Jul 2026 $8.53 24 Jul 2026 $8.75 27 Jul 2026 $8.70 28 Jul 2026 $8.56 29 Jul 2026 $8.56 30 Jul 2026 $8.41 31 Jul 2026 $8.12 3 Aug 2026 $8.33 4 Aug 2026 $8.49 5 Aug 2026 $8.49 6 Aug 2026 $8.58 7 Aug 2026 $8.76 10 Aug 2026 $9.12 11 Aug 2026 $9.22 12 Aug 2026 $9.26 13 Aug 2026 $9.08 14 Aug 2026 $8.86 17 Aug 2026 $8.88 18 Aug 2026 $8.71 19 Aug 2026 $9.29 20 Aug 2026 $9.03 21 Aug 2026 $9.45 24 Aug 2026 $9.39 25 Aug 2026 $9.42 26 Aug 2026 $9.25 27 Aug 2026 $9.09 28 Aug 2026 $9.33 31 Aug 2026 $9.35 1 Sep 2026 $9.61 2 Sep 2026 $9.69 3 Sep 2026 $9.60 4 Sep 2026 $9.82 8 Sep 2026 $9.54 9 Sep 2026 $9.30 10 Sep 2026 $9.02 11 Sep 2026 $8.93 14 Sep 2026 $8.86 15 Sep 2026 $8.33 16 Sep 2026 $8.24 17 Sep 2026 $8.46 18 Sep 2026 $8.58 21 Sep 2026 $8.51 22 Sep 2026 $8.99 23 Sep 2026 $8.68 24 Sep 2026 $8.32 25 Sep 2026 $8.29 28 Sep 2026 $8.72 29 Sep 2026 $8.78 30 Sep 2026 $8.38 1 Oct 2026 $8.54 2 Oct 2026 $8.36 5 Oct 2026 $8.27 6 Oct 2026 $8.02 7 Oct 2026 $8.48 8 Oct 2026 $8.61 9 Oct 2026 $8.84 SCULLY WILLIAM P 10% owner Bought $981.30K 22 May 2026 · at $9.81 · 13.6% of stake SCULLY WILLIAM P 10% owner Bought $471.30K 2 Jun 2026 · at $9.43 · 6.0% of stake SCULLY WILLIAM P 10% owner Bought $465.30K 4 Jun 2026 · at $9.31 · 5.6% of stake SCULLY WILLIAM P 10% owner Bought $1.02M 11 Jun 2026 · at $8.17 · 13.4% of stake SCULLY WILLIAM P 10% owner Bought $157.99K 16 Jun 2026 · at $7.90 · 2.7% of stake Kingston Anne Evans Chief Strategy Officer Sold on a plan $64.92K 29 Jul 2026 · at $8.47 · 12.1% of stake Isaacs Michael John General Counsel & Company Sec. Sold on a plan $71.06K 29 Jul 2026 · at $8.47 · 19.0% of stake SCULLY WILLIAM P 10% owner Bought $30.17K 7 Aug 2026 · at $8.62 · 4.4% of stake SCULLY WILLIAM P 10% owner Bought $293.05K 7 Aug 2026 · at $8.62 · 4.5% of stake SCULLY WILLIAM P 10% owner Bought $439.43K 20 Aug 2026 · at $8.79 · 6.7% of stake SCULLY WILLIAM P 10% owner Bought $255.74K 2 Sep 2026 · at $9.47 · 3.4% of stake SCULLY WILLIAM P 10% owner Bought $843.46K 18 Sep 2026 · at $8.43 · 12.1% of stake SCULLY WILLIAM P 10% owner Bought $889.87K 28 Sep 2026 · at $8.60 · 124% of stake SCULLY WILLIAM P 10% owner Bought $1.41M 29 Sep 2026 · at $8.68 · 312% of stake SCULLY WILLIAM P 10% owner Bought $857.24K 2 Oct 2026 · at $8.57 · 46.7% of stake SCULLY WILLIAM P 10% owner Bought $1.05M 7 Oct 2026 · at $8.40 · 39.8% of stake SCULLY WILLIAM P 10% owner Bought $770.90K 8 Oct 2026 · at $8.57 · 20.5% of stake
15 buys0 sales at will2 planned sales

Key numbers

Fiscal year 2025, ended 31 Dec 2025, as filed
Revenue
$9.68M
Net income
$244.09M
Free cash flow
$163.58M
Operating margin
-2,216.4%
Net margin
-2,520.6%
Return on equity
-87.0%
Return on capital
-60.5%
Revenue growth, 1 yr
-92.8%
Revenue growth, 5 yr
62.6% a year

Revenue and net income

Fiscal years, as filed with the SEC · point at a year for the detail
853K -111M FY20 Fiscal year 2020 Revenue $853.00K Net income $111.14M Margin -13,029.8% 201M 67M FY21 Fiscal year 2021 Revenue $200.58M Net income $66.98M Margin 33.4% · growth +23,414.3% 54M -117M FY22 Fiscal year 2022 Revenue $53.91M Net income $116.95M Margin -217.0% · growth -73.1% 91M -147M FY23 Fiscal year 2023 Revenue $91.37M Net income $147.03M Margin -160.9% · growth +69.5% 135M -122M FY24 Fiscal year 2024 Revenue $135.16M Net income $122.31M Margin -90.5% · growth +47.9% 10M -244M FY25 Fiscal year 2025 Revenue $9.68M Net income $244.09M Margin -2,520.6% · growth -92.8%
RevenueNet incomeLoss

Latest insider transactions

From Form 4, most recent first
All of them →
DateInsiderTypeValueOf own stake
8 Oct 2026 SCULLY WILLIAM P
10% owner
Bought $770.90K 20.5%
7 Oct 2026 SCULLY WILLIAM P
10% owner
Bought $1.05M 39.8%
2 Oct 2026 SCULLY WILLIAM P
10% owner
Bought $857.24K 46.7%
29 Sep 2026 SCULLY WILLIAM P
10% owner
Bought $1.41M 312%
28 Sep 2026 SCULLY WILLIAM P
10% owner
Bought $889.87K 124%
18 Sep 2026 SCULLY WILLIAM P
10% owner
Bought $843.46K 12.1%