Glancy Prongay & Murray LLP (“GPM”) reminds investors of the upcoming July 25, 2022 deadline to file a lead plaintiff motion in the class action filed on behalf of investors who purchased or otherwise acquired Spero Therapeutics, Inc. (“Spero” or the “Company”) (NASDAQ: SPRO) securities between October 28, 2021 and May 2, 2022, inclusive (the “Class Period”).

If you suffered a loss on your Spero investments or would like to inquire about potentially pursuing claims to recover your loss under the federal securities laws, you can submit your contact information at www.glancylaw.com/cases/spero-therapeutics-inc/. You can also contact Charles H. Linehan, of GPM at 310-201-9150, Toll-Free at 888-773-9224, or via email at shareholders@glancylaw.com to learn more about your rights.

On October 28, 2021, Spero announced that it had submitted a New Drug Application (“NDA”) to the U.S. Food and Drug Administration (“FDA”) for its urinary tract infection treatments, tebipenem HBr.

On March 31, 2022, Spero released its fourth quarter and full year 2021 financial results, disclosing that the FDA had notified the Company that it had “identified deficiencies” in the NDA “that preclude discussion of labeling and post-marketing requirements/commitments.”

On this news, Spero’s stock fell $1.59, or 18.27%, to close at $7.11 per share on April 1, 2022.

Then, on May 3, 2022, Spero issued a press release announcing “that it will immediately defer current commercialization activities for tebipenem HBr based on feedback from a recent Late Cycle Meeting with the [FDA] regarding Spero’s [NDA] for tebipenem HBr[,]” and that, “[a]lthough the review is still ongoing and the FDA has not yet made any final determination regarding approvability, the discussion suggested that the data package may be insufficient to support approval during this review cycle.” Spero also disclosed that it would be “undertaking a reduction in its workforce by approximately 75% and a restructuring of its operations to reduce operating costs and reallocate resources.”

On this news, Spero’s stock fell $3.25, or 63.65%, to close at $1.85 per share on May 3, 2022, thereby injuring investors further.

The complaint filed in this class action alleges that throughout the Class Period, Defendants made materially false and/or misleading statements, as well as failed to disclose material adverse facts about the Company’s business, operations, and prospects. Specifically, Defendants failed to disclose to investors that: (1) the data submitted in support of the Tebipenem HBr NDA were insufficient to obtain FDA approval; (2) accordingly, it was unlikely that the FDA would approve the Tebipenem HBr NDA in its current form; (3) the foregoing would necessitate a significant workforce reduction and restructuring of Spero’s operations; and (4) as a result, Defendants’ positive statements about the Company’s business, operations, and prospects were materially misleading and/or lacked a reasonable basis at all relevant times.

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If you purchased or otherwise acquired Spero securities during the Class Period, you may move the Court no later than July 25, 2022 to request appointment as lead plaintiff in this putative class action lawsuit. To be a member of the class action you need not take any action at this time; you may retain counsel of your choice or take no action and remain an absent member of the class action. If you wish to learn more about this class action, or if you have any questions concerning this announcement or your rights or interests with respect to the pending class action lawsuit, please contact Charles Linehan, Esquire, of GPM, 1925 Century Park East, Suite 2100, Los Angeles, California 90067 at 310-201-9150, Toll-Free at 888-773-9224, by email to shareholders@glancylaw.com, or visit our website at www.glancylaw.com. If you inquire by email please include your mailing address, telephone number and number of shares purchased.

This press release may be considered Attorney Advertising in some jurisdictions under the applicable law and ethical rules.

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