QTTB 424B3: Secondary offering

Q32 Bio Inc.

Filed with the SEC on Jul 28, 2026 · accession 0001193125-26-321196

QTTB filed a 424B3 (prospectus (offering)) with the SEC on Jul 28, 2026. Q32 Bio Inc. filed a prospectus for the resale of up to 6,875,000 shares of common stock by selling stockholders, including shares issuable upon exercise of pre-funded warrants, under a shelf registration statement. The stock moved +3.3% by the first close after the filing.

Summary of the filing

Q32 Bio Inc. filed a prospectus for the resale of up to 6,875,000 shares of common stock by selling stockholders, including shares issuable upon exercise of pre-funded warrants, under a shelf registration statement. The company will not receive proceeds from the resale but may receive nominal proceeds from warrant exercises.

For details, click here →How to read a 424B3 →

Key details

shares of common stock registered for resale$6.9M

closing price per share on July 27, 2026$15

IssuerQ32 Bio Inc.

How QTTB stock reacted

Close before

$15.21

Jul 27, 2026

First close after

+3.29%

$15.71

5 trading days

-0.30%

$15.16

Since filing

-39.18%

$9.25

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Frequently asked questions

What did QTTB file with the SEC on Jul 28, 2026?

QTTB filed a 424B3 (Secondary offering). Q32 Bio Inc. filed a prospectus for the resale of up to 6,875,000 shares of common stock by selling stockholders, including shares issuable upon exercise of pre-funded warrants, under a shelf registration statement. The company will not receive proceeds from the resale but may receive nominal proceeds from warrant exercises.

What does a secondary offering mean for QTTB stock?

New shares dilute existing holders and are often sold at a discount to the market price.

How do I read a 424B3?

The final terms of an offering of shares or bonds. Look at price, number of shares and the discount to the market price. Large offerings dilute existing shareholders.

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 424B3 (prospectus (offering)): The final terms of an offering of shares or bonds.

How did QTTB stock react to this filing?

QTTB closed at $15.21 before the filing and $15.71 on Jul 28, 2026 (+3.29%). Five trading days later: $15.16 (-0.30%).

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