Investor Resources

Transfer Agent and Registrar

American Stock Transfer & Trust Company
6201 15th Avenue
Brooklyn, New York 11219
Phone: 800-937-5449

Independent Registered Public Accounting Firm

Philadelphia, Pennsylvania

Stock Listing

The company’s common stock trades on NYSE American under the symbol PTN.

For Institutional Investors and Media:

Paul Arndt, MBA
LifeSci Advisors, LLC
(646) 597-6992

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