Palvella Therapeutics Announces Closing of Merger With Pieris Pharmaceuticals & Concurrent Private Placement of $78.9 Million

Palvella Therapeutics, Inc. recently announced the completion of its previously announced merger with Pieris Pharmaceuticals, Inc. (Pieris). The combined company will operate under the name Palvella Therapeutics, Inc., and its shares are expected to begin trading on the Nasdaq Capital Market on December 16, 2024, under the ticker symbol PVLA.  Palvella will continue to be led by Wes Kaupinen, its Founder and Chief Executive Officer, and other members of the Palvella management team. The transaction was approved by Pieris stockholders at a special meeting held on December 11, 2024, and the transaction had been previously approved by Palvella stockholders.

“With strong support from leading healthcare-dedicated investors, Palvella is well positioned to enter the public markets and pursue our vision of becoming the leading rare disease company focused on developing and commercializing novel therapies to treat patients suffering from serious, rare genetic skin diseases,” said Mr. Kaupinen. “This transaction will enable us to accelerate late-stage development of QTORIN rapamycin, our lead product candidate, for microcystic LMs and cutaneous VMs while also further advancing additional novel product candidates from our QTORIN platform.”

Concurrent with the merger, Palvella completed a previously announced oversubscribed $78.9-million private placement co-led by BVF Partners, L.P., an existing investor, and Frazier Life Sciences, a new investor, and with participation from a syndicate of leading healthcare-dedicated investors. Additional new investors include Blue Owl Healthcare Opportunities, Nantahala Capital, DAFNA Capital Management, ADAR1 Capital Management, and a healthcare dedicated fund. Existing investors Samsara BioCapital, Petrichor, CAM Capital, Ligand Pharmaceuticals, Integrated Finance Group (an AscellaHealth partner company), BioAdvance, and Gore Range Capital also participated in the financing. Palvella’s cash and cash equivalents of approximately $80.0 million is expected to fund operations into the second half of 2027, including through results from the SELVA Phase 3 clinical trial of QTORIN™ rapamycin for the treatment of microcystic LMs and Phase 2 clinical trial of QTORIN rapamycin in cutaneous VMs.

Palvella’s research team developed QTORIN, a patented and versatile platform designed to generate novel topical therapies that penetrate the deep layers of the skin to locally treat a broad spectrum of serious, rare genetic skin diseases. Well-accepted mechanisms of action of rapamycin and other therapeutic agents represent potential therapies for rare genetic skin diseases. However, the adverse event profile of those agents through systemic exposure poses significant barriers to patient adoption. Palvella’s QTORIN product candidates are designed for targeted, localized delivery of therapeutic agents to pathogenic tissue of interest while minimizing systemic absorption and thereby reducing the risk of unwanted adverse events associated with systemic therapy.

Palvella’s lead product candidate QTORIN rapamycin is a novel, patented 3.9% rapamycin anhydrous gel currently under development for the treatment of microcystic LMs, cutaneous VMs, and other serious, functionally debilitating skin diseases driven by the overactivation of the mammalian target of rapamycin (mTOR) pathway. QTORIN rapamycin has received FDA Breakthrough Therapy Designation, Fast Track Designation, and Orphan Drug Designation for microcystic LMs and is the recent recipient of up to a $2.6 million FDA Orphan Products Grant. QTORIN rapamycin has also received Fast Track Designation for venous malformations. QTORIN rapamycin is protected by issued composition patents covering anhydrous gel formulations of rapamycin, as well as methods of use, in the US, Japan, Australia, China, and Israel and pending patent applications broadly covering anhydrous gel formulations of rapamycin, as well as methods of use, in the US and other countries.

In the third quarter of 2024, Palvella initiated SELVA, a 24-week, Phase 3, single-arm, baseline-controlled clinical trial of QTORIN rapamycin administered once daily for the treatment of microcystic LMs. The primary efficacy endpoint is the change from baseline in the overall microcystic LM Investigator Global Assessment (mLM-IGA) at week 24. The Phase 3 study is enrolling approximately 40 subjects, age six or older, at leading vascular anomaly centers across the U.S.

Based on the final exchange ratio of approximately 0.30946 shares of Pieris common stock for each share of Palvella common stock, at the closing of the merger, there are approximately 13.95 million shares of the combined company’s common stock outstanding on a diluted basis, with prior Pieris stockholders owning approximately 11% on a diluted basis and prior Palvella stockholders (including investors in the private placement) holding approximately 89% of the combined company’s outstanding common stock on a diluted basis.

In connection with the closing of the merger, Pieris issued a non-transferable contingent value right (CVR) to Pieris shareholders of record immediately prior to the closing, which does not include the former holders of shares of Palvella or the private financing investors. Holders of the CVR will be entitled to receive payments from proceeds received by the combined company, if any, under Pieris’ existing partnership agreements with Pfizer and Boston Pharmaceuticals, in addition to other potential licensing agreements involving certain of Pieris’ legacy assets, as well as certain potential payments related to historical research and development tax credits, which may or may not be realized.

TD Cowen served as lead placement agent and Cantor served as a placement agent for Palvella’s concurrent financing. Troutman Pepper Hamilton Sanders LLP served as legal counsel to Palvella. Cooley LLP served as legal counsel to the placement agents. Stifel served as the exclusive financial advisor to Pieris and Mintz, Levin, Cohn, Ferris, Glovsky, and Popeo, P.C. served as legal counsel to Pieris.

 Microcystic LMs are a rare, chronically debilitating genetic disease caused by dysregulation of the phosphatidylinositol 3-kinase (PI3K)/mTOR pathway. The disease is characterized by malformed lymphatic vessels that protrude through the skin and persistently leak lymph fluid (lymphorrhea) and bleed, often leading to recurrent serious infections and cellulitis that can cause hospitalization. The natural history of microcystic LMs are persistent and progressive without spontaneous resolution, with symptoms generally worsening during life, including increases in the number and size of malformed vessels that lead to complications and lifetime morbidity. There are currently no FDA-approved treatments for the estimated more than 30,000 diagnosed patients with microcystic LMs in the US.

Founded and led by rare drug disease drug development veterans, Palvella Therapeutics (Nasdaq: PVLA) is a clinical-stage biopharmaceutical company focused on developing and commercializing novel therapies to treat patients suffering from serious, rare genetic skin diseases for which there are no FDA-approved therapies. Palvella is developing a broad pipeline of product candidates based on its patented QTORIN™ platform, with an initial focus on serious, rare genetic skin diseases, many of which are lifelong in nature. Palvella’s lead product candidate, QTORIN 3.9% rapamycin anhydrous gel (QTORIN rapamycin), is currently in the Phase 3 SELVA clinical trial in microcystic lymphatic malformations (microcystic LMs) and a Phase 2 trial in cutaneous venous malformations. For more information, visit www.palvellatx.com.

QTORIN rapamycin is for investigational use only and has not been approved or cleared by the FDA or by any other regulatory agency.