ACELYRIN, INC. Announces Pricing of Upsized Initial Public Offering


LOS ANGELES, May 4, 2023 /PRNewswire/ -- ACELYRIN, INC., a late-stage clinical biopharma company focused on accelerating the development and delivery of transformative medicines in immunology, today announced the pricing of its upsized initial public offering of 30,000,000 shares of common stock at a price to the public of $18.00 per share. All of the shares of common stock are being offered by ACELYRIN. The gross proceeds to ACELYRIN from the offering, before deducting underwriting discounts and commissions and other offering expenses payable by ACELYRIN, are expected to be $540.0 million. In addition, ACELYRIN has granted the underwriters a 30-day option to purchase up to an additional 4,500,000 shares of common stock at the initial public offering price, less underwriting discounts and commissions.

The shares are expected to begin trading on the Nasdaq Global Select Market on May 5, 2023 under the symbol "SLRN." The offering is expected to close on May 9, 2023, subject to the satisfaction of customary closing conditions.

Morgan Stanley, Jefferies, TD Cowen and Piper Sandler are acting as joint book-running managers for the offering.

Registration statements relating to the securities being sold in this offering have been filed with the U.S. Securities and Exchange Commission (SEC) and became effective on May 4, 2023. A copy of the registration statements can be accessed through the SEC's website at This offering is being made only by means of a prospectus forming part of the registration statements relating to these securities. When available, a copy of the final prospectus relating to this offering may be obtained from: Morgan Stanley & Co. LLC, Attention: Prospectus Department, 180 Varick Street, 2nd Floor, New York, New York 10014; Jefferies LLC, Attention: Equity Syndicate Prospectus Department, 520 Madison Avenue, New York, New York 10022, by telephone at (877) 821-7388, or by e-mail at; Cowen and Company, LLC, 599 Lexington Avenue, New York, New York 10022, by telephone at (833) 297-2926, or by e-mail at; or Piper Sandler & Co., 800 Nicollet Mall, J12S03, Minneapolis, Minnesota 55402, Attention: Prospectus Department, by telephone at (800) 747-3924, or by e-mail at

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

ACELYRIN, INC. is a Los Angeles area-based late-stage clinical biopharma company – with additional operations in the San Francisco Bay area – focused on providing patients life-changing new treatment options by identifying, acquiring, and accelerating development and commercialization of promising product candidates.


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