Power of Attorney for Ignelzi Troy A.

This filing details a Power of Attorney granted by Ignelzi Troy A. to Jeffrey Dayno and Christian Ulrich, appointing them as attorneys-in-fact. They are authorized to execute and file various SEC forms, including Schedules 13D and 13G, and Forms 3, 4, and 5, related to Harmony Biosciences Holdings, Inc. securities. This authorization allows the attorneys-in-fact to act on behalf of Ignelzi Troy A. for all necessary actions concerning these filings, including amendments and timely submission to the SEC and stock exchanges. The Power of Attorney remains in effect until Ignelzi Troy A. is no longer required to file these documents or until it is revoked in writing. The appointment is effective as of April 2, 2026.