Massachusetts' Spero Files for $86 Million IPO

Spero Therapeutics Files Registration Statement for Proposed Initial Public Offering

CAMBRIDGE, Mass., Oct. 06, 2017 (GLOBE NEWSWIRE) -- Spero Therapeutics, Inc. (“Spero”), a multi-asset clinical-stage biopharmaceutical company focused on identifying, developing and commercializing novel treatments for multi-drug resistant bacterial infections, today announced that it has publicly filed a registration statement on Form S-1 with the U.S. Securities and Exchange Commission (the “SEC”) relating to a proposed initial public offering of shares of its common stock. The number of shares to be offered and the price range for the proposed offering have not yet been determined. Spero has applied to list its common stock on The NASDAQ Global Market under the ticker symbol “SPRO.”

BofA Merrill Lynch, Cowen and Stifel will act as joint book-running managers for the proposed offering. Oppenheimer & Co. will act as a co-manager.

The proposed offering will be made only by means of a prospectus. Copies of the preliminary prospectus, when available, may be obtained from BofA Merrill Lynch, NC1-004-03-43, 200 North College Street, 3rd floor, Charlotte, NC 28255-0001, Attention: Prospectus Department, or by email at dg.prospectus_requests@baml.com; from Cowen and Company, LLC, c/o Broadridge Financial Solutions, 1155 Long Island Avenue, Edgewood, NY 11717, Attention: Prospectus Department, or by telephone at (631) 274-2806; and from Stifel, Nicolaus & Company, Incorporated, Attention: Syndicate, One Montgomery Street, Suite 3700, San Francisco, CA 94104, or by telephone at (415) 364-2720 or by email at syndprospectus@stifel.com.

A registration statement relating to these securities has been filed with the SEC, but has not yet become effective. These securities may not be sold, nor may offers to buy be accepted, prior to the time the registration statement becomes effective. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, 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 registration or qualification under the securities laws of any such state or jurisdiction.

About Spero
Spero Therapeutics, Inc. is a multi-asset, clinical-stage biopharmaceutical company focused on identifying, developing and commercializing novel treatments for multi-drug resistant bacterial infections.

Spero Media and Investor Contact:
Stern Investor Relations
Beth DelGiacco, Vice President
212-362-1200
Beth@sternir.com

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