SPRO 8-K: SEC filing

Spero Therapeutics

Filed with the SEC on Nov 12, 2026 · accession 0001193125-26-458637

SPRO filed a 8-K (current report) with the SEC on Nov 12, 2026. A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The stock moved -2.3% by the first close after the filing.

Summary of the filing

Spero Therapeutics issued a press release announcing its financial results for the third quarter ended September 30, 2026, furnished as Exhibit 99.1 to the Form 8-K.

For details, click here →How to read a 8-K →

Key details

RegistrantSpero Therapeutics, Inc.

Chief executive officer and chief financial officerEsther Rajavelu

How SPRO stock reacted

Close before

$1.02

Nov 11, 2026

First close after

-2.27%

$1.00

5 trading days

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Since filing

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Frequently asked questions

What did SPRO file with the SEC on Nov 12, 2026?

SPRO filed a 8-K (SEC filing). Spero Therapeutics issued a press release announcing its financial results for the third quarter ended September 30, 2026, furnished as Exhibit 99.1 to the Form 8-K.

How do I read a 8-K?

A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more. The "Item" number tells you the topic (e.g. 2.02 results, 5.02 executive change, 1.01 new agreement, 1.03 bankruptcy). Exhibits (99.1 press release) usually hold the details.

Why are SEC filings important?

Public companies must tell the SEC about anything that can change their value — results, leadership changes, big deals, new shares, bankruptcy. Filings are the official source, often before the news. A 8-K (current report): A report of a major event, filed within four business days: results, deals, leadership changes, bankruptcy and more.

How did SPRO stock react to this filing?

SPRO closed at $1.02 before the filing and $1.00 on Nov 12, 2026 (-2.27%).

Other SPRO SEC filings

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