Glancy Prongay & Murray LLP Commences Investigation on Behalf of Prothena Corporation Investors

Glancy Prongay & Murray LLP ("GPM") announces an investigation on behalf of Prothena Corporation ("Prothena" or the "Company") PRTA investors concerning the Company and its officers' possible violations of federal securities laws. To obtain information or aid in the investigation, please visit the Prothena investigation page on our website at www.glancylaw.com/case/prothena-corporation.

On October 15, 2015, Prothena disclosed its late-stage Phase 2b "PRONTO" study and expansion of its Phase 1/2 clinical trial for the antibody NEOD001. On April 23, 2018, Prothena announced it was ending development of NEOD001 after its Phase 2b PRONTO trial failed to reach either its primary or secondary endpoints. On this news, shares of Prothena fell $25.34, or nearly 69%, to close at $11.50 on April 23, 2018, thereby injuring investors.

If you purchased Prothena securities, have information or would like to learn more about these claims, or have any questions concerning this announcement or your rights or interests with respect to these matters, please contact Lesley F. Portnoy, Esquire, of GPM, 1925 Century Park East, Suite 2100, Los Angeles, California 90067 at 310-201-9150, Toll-Free at 888-773-9224, by email to shareholders@glancylaw.com, or visit our website at www.glancylaw.com. If you inquire by email please include your mailing address, telephone number and number of shares purchased.

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