Scott+Scott Attorneys at Law LLP Reminds Investors of Securities Class Action Against Prothena Corporation plc (PRTA)

Attorneys at Law LLP (“Scott+Scott”), a national securities and
consumer rights litigation firm, reminds investors that a class action
lawsuit has been filed against Prothena Corporation plc (NASDAQ: PRTA)
(“Prothena” or the “Company”) and other defendants, related to alleged
violations of federal securities laws. If you purchased Prothena
stock between October 15, 2015 and April 20, 2018, you are encouraged to
contact a Scott+Scott attorney at (844) 818-6982 for additional
information. Investors have until July 16, 2018, to move for lead

Prothena is a biotechnology company.

The lawsuit alleges that Prothena misled investors regarding its
development of NEOD001, an antibody designed to treat AL amyloidosis, a
debilitating disease that can lead to organ failure and death.
Specifically, defendants misleadingly cited the results of Prothena’s
ongoing Phase 1/2 clinical study of NEOD001 as evidence that the drug
was effective and provided a strong basis for late-stage Phase 2b and
Phase 3 studies of. In truth, NEOD001 was not an effective treatment for
AL amyloidosis and did not provide an adequate basis for late-stage
Phase 2b and Phase 3 studies.

On April 23, 2018, before the market opened, Prothena announced that it
was ending all development of NEOD001 after data from its Phase 2b
PRONTO trial showed that NEOD001 failed to reach either its primary or
secondary endpoints.

On this news, the price of Prothena stock fell from its close price of
$36.84 per share on April 20, 2018, to close at $11.50 per share on
April 23, 2018, a drop of over 68%.

What You Can Do

If you purchased Prothena shares between October 15, 2015 and April
20, 2018, inclusive, or if you have questions about this notice or
your legal rights, please contact attorney Joe Pettigrew at (844)
818-6980, or at

About Scott+Scott Attorneys at Law LLP

Scott+Scott has significant experience in prosecuting major securities,
antitrust, and employee retirement plan actions throughout the United
States. The firm represents pension funds, foundations, individuals, and
other entities worldwide with offices in New York, London, Connecticut,
California, and Ohio.

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