Prothena Corporation plc

Prothena Corporation plc

Healthcare

NASDAQ:PRTA · NASDAQ Global Select

Market Cap $431.91M Beta -0.32 P/E (TTM) -2.9
$8.25 -0.12%

-$0.01 today

52W Low $5.29High $11.80

Vol 0.29M · Avg 0.51M

EPS (TTM)-$2.81
Biotechnology

Management

Put operating results in leadership context

Review returns on capital, executive background, insider transactions, and growth quality to judge whether management is compounding value well.

Return Metrics

ROE, ROIC & ROA over time

Management

ROE

-87.0%

avg -34.9%

ROIC

-63.9%

avg -28.1%

ROA

-74.7%

avg -26.6%

Analysis

ROIC is currently the strongest return metric at -63.9% versus its period average of -28.1%. 0 of 3 return metrics are above their quality threshold, which helps indicate how efficiently the company turns capital and assets into profit.

Management

Key executives, compensation & ownership

Management
NameTitleCompensationTenureAgeShares OwnedOwnership %

Gene G. Kinney

President, Chief Executive Officer & Director$1.12M57$520,000.000.99%

Tran Nguyen

Chief Financial Officer$916,334.0052$230,000.000.44%

Brandon S. Smith

Chief Operating Officer$826,819.0051$190,000.000.36%

Chad Swanson

Chief Development Officer$739,084.00$190,000.000.36%

Wagner Zago

Chief Scientific Officer$735,660.0053$190,000.000.36%

Michael J. Malecek

Chief Legal Officer & Company Secretary$588,250.0060$0.00<0.01%

Mark C. Johnson

Vice President of Investor Relations

Annie Evans Kingston

Chief Strategy Officer$0.00<0.01%

Karin L. Walker

Chief Accounting Officer & Controller63$150,000.000.29%

Phillip Dolan

Sr. Director & Head of Exploratory Research

Insider Trading

SEC Form 4 transactions — last 12 months

Management

Buys

4

$2.94M

Sells

0

$0.00

Net Sentiment

+$2.94M

Net buying

Most Active

SCULLY WILLIAM P

4 transactions

DateInsiderTypeSharesPriceValue
Jun 11, 2026

SCULLY WILLIAM P

Direct

Buy125.0K$8.17$1,021,225.00
Jun 4, 2026

SCULLY WILLIAM P

Direct

Buy50.0K$9.31$465,295.00
Jun 2, 2026

SCULLY WILLIAM P

Direct

Buy50.0K$9.43$471,300.00
May 22, 2026

SCULLY WILLIAM P

Direct

Buy100.0K$9.81$981,300.00

Analysis

Insiders reported 4 buys worth $2.94M and 0 sells worth $0.00 over the last 12 months. That adds up to net buying of $2.94M. SCULLY WILLIAM P was the most active insider with 4 transactions.

Growth Analysis

Historical CAGR & forward analyst estimates

Metric 10yr5yr3yr Fwd Est.
EPSN/AN/AN/A
N/A2 analysts
RevenueN/AN/A-15.4%
+40.6% (15yr)3 analysts
Net IncomeN/AN/AN/A
N/A3 analysts
EBITN/AN/AN/A
N/A3 analysts

Analysis

Recent growth has been strongest in Revenue at -15.4% over three years. Forward estimates point to Revenue at +40.6% (15yr), giving you a quick check on whether expectations are accelerating or cooling.

Who manages PRTA?

Prothena Corporation plc (PRTA) lists 10 active executives. The top listed executive is Tran Nguyen, Chief Financial Officer.

Are PRTA insiders buying or selling?

Recent insider activity shows net buying of $21.69M.

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