Alpine Immune Sciences, Inc. (NASDAQ:ALPN), a leading clinical-stage immunotherapy company focused on developing innovative treatments for cancer and autoimmune/inflammatory diseases, today announced it has entered into a definitive securities purchase agreement for the sale of common stock and prefunded warrants, as described below, in a private placement with certain institutional and other accredited investors for gross proceeds to Alpine of approximately $91 million, before deducting offering expenses. The private placement is being led by Frazier Life Sciences Public Fund with participation from Decheng Capital, BVF Partners, TCG X, Avidity Partners, OrbiMed, Omega Fund, and Logos Capital, among others.

"As a long-term backer of Alpine, we are impressed by the company's progress and their emergence as a leader in both immunology and immuno-oncology," said James Topper, M.D., Ph.D, Managing General Partner of Frazier's Life Sciences team. "This financing will help the company to pursue a focused and rapid development plan for ALPN-303, a potentially best-in-class inhibitor of the BAFF and APRIL pathways, and will also support the ongoing development of ALPN-202 as it enters monotherapy expansion cohorts next year and expands its development efforts in combination with Keytruda. We are pleased to lead this syndicate of strong investors and look forward to supporting the company in this next phase of growth."

Pursuant to the terms of the securities purchase agreement, at the closing of the private placement, Alpine will issue approximately 6.5 million shares of common stock and approximately 3.2 million prefunded warrants to purchase the same number of shares of common stock. Both the common stock and prefunded warrants will be sold at a price of $9.40 per share or prefunded warrant, respectively. The prefunded warrants will have a per share exercise price of $0.001 and will be exercisable at any time on or after the closing date. The price of the common stock and prefunded warrants is at a 4.4% premium to the closing price of $9.00 per share of Alpine's common stock on the Nasdaq Global Market on September 14, 2021.

The private placement is expected to close on or about September 17, 2021, subject to the satisfaction of customary closing conditions. Additional details regarding the private placement will be included in a Form 8-K to be filed by Alpine with the Securities and Exchange Commission ("SEC").

Alpine intends to use the net proceeds to support the expansion of its pipeline, including the development of ALPN-303 in lupus and other B cell-mediated inflammatory diseases. In addition, net proceeds will be used to support the further clinical development of ALPN-202 as well as Alpine's discovery programs and general corporate purposes.

In connection with the entry into the securities purchase agreement, an affiliate of Frazier Life Sciences Public Fund entered into an exchange agreement with Alpine, pursuant to which Alpine will exchange an aggregate of 1.2 million shares of common stock currently held by the affiliate of Frazier Life Sciences Public Fund for prefunded warrants to purchase an aggregate of 1.2 million shares of common stock, which prefunded warrants have identical terms to the prefunded warrants sold pursuant to the securities purchase agreement. After giving effect to the exchange of 1.2 million shares of common stock and the issuance of the approximately 6.5 million shares pursuant to the securities purchase agreement, the number of shares of Alpine's outstanding common stock immediately after this offering would be approximately 29.2 million as of July 30, 2021. The closing of the exchange is subject to customary closing conditions and is contingent upon and will occur immediately following the closing of the private placement.

The securities being sold in the private placement have not been registered under the Securities Act of 1933, as amended, or state securities laws and may not be offered or sold in the United States absent registration with the SEC or an applicable exemption from such registration requirements. Alpine has agreed to file a registration statement with the SEC covering the resale of the shares of common stock issuable in connection with the private placement and upon exercise of the prefunded warrants.

This press release shall not constitute an offer to sell or the solicitation of an offer to buy these securities, nor shall there be any sale of these securities in any jurisdiction in which such offer, solicitation or sale would be unlawful prior to the registration or qualification under the securities laws of any such jurisdiction.

About Alpine Immune Sciences, Inc.

About Frazier Healthcare Partners

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The Alpine logo is a registered trademark or trademark of Alpine Immune Sciences, Inc. in various jurisdictions.

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