UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant ☒            Filed by a Party other than the Registrant ☐

Check the appropriate box:

☐     Preliminary Proxy Statement

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☐    Definitive Proxy Statement

☒     Definitive Additional Materials

☐     Soliciting Material Under § 240.14a-12

Pieris Pharmaceuticals, Inc.

(Name of Registrant as Specified In Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

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