Generation Bio common stock to be delisted from Nasdaq

Generation Bio Co. filed a Form 25 through Nasdaq Stock Market LLC to remove its common stock from listing and registration under Section 12(b) of the Securities Exchange Act of 1934.

Rhea-AI Filing Summary

Generation Bio Co. filed a Form 25 through Nasdaq Stock Market LLC to remove its common stock from listing and registration under Section 12(b) of the Securities Exchange Act of 1934. This means its common stock will no longer be listed on the Nasdaq exchange once the process is completed.

Positive

• None.

Negative

• Generation Bio Co. common stock removed from Nasdaq listing and Section 12(b) registration, which can reduce trading liquidity and market visibility for shareholders.

Insights

Equity Markets & Listing Standards Analyst

Generation Bio’s common stock is being removed from Nasdaq listing and Section 12(b) registration.

The notification shows that Generation Bio Co. common stock is being struck from listing on the Nasdaq Stock Market LLC under Section 12(b) of the Exchange Act via Form 25. This typically shifts trading to less liquid venues and changes reporting obligations tied to that listing.

The text states that Nasdaq has complied with its rules to strike the class of securities from listing and registration under 17 CFR 240.12d2-2(b). It also notes issuer compliance with exchange rules and 17 CFR 240.12d2-2(c) governing withdrawal of listing and registration, indicating procedural adherence without giving a reason.

For investors, the key practical change is that Generation Bio’s common stock will no longer trade on Nasdaq once the delisting process is effective, which can affect liquidity and visibility. Subsequent company filings may clarify any new trading venue and ongoing reporting framework.

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What does Generation Bio Co. Form 25 mean for GBIO shareholders?

The Form 25 indicates Generation Bio Co. common stock is being removed from Nasdaq listing and Section 12(b) registration. After this process, shares will no longer trade on Nasdaq, which can affect liquidity and how easily investors can buy or sell the stock.

Which Generation Bio Co. security is affected by this Nasdaq action?

The action applies specifically to Generation Bio Co.’s common stock, which is being struck from listing and registration on the Nasdaq Stock Market LLC. Other securities are not mentioned in the notice, so the change focuses on the primary common equity listing.

Who initiated the removal of Generation Bio Co. from Nasdaq?

The notification is filed by Nasdaq Stock Market LLC, which certifies it has complied with its rules to strike Generation Bio Co.’s common stock from listing and registration. The text also notes that the issuer has complied with exchange rules and relevant SEC requirements for withdrawal.

What regulations govern Generation Bio Co.’s Nasdaq delisting?

The removal is processed under Section 12(b) of the Securities Exchange Act of 1934 and SEC rules 17 CFR 240.12d2-2(b) and 17 CFR 240.12d2-2(c). These regulations outline how an exchange and issuer remove a security from listing and registration.

Will Generation Bio Co. still have SEC registration after Form 25?

The Form 25 concerns removal of Generation Bio Co.’s common stock from listing and registration under Section 12(b). It does not, by itself, describe any status under other sections of the Exchange Act, so only the Section 12(b) listing registration is clearly being withdrawn here.

Who signed the Nasdaq notification regarding Generation Bio Co.?

The notification is signed on behalf of Nasdaq Stock Market LLC by Tara Petta, identified as AVP. This signature certifies Nasdaq believes it meets all requirements to file Form 25 for the removal of Generation Bio Co.’s common stock from listing and registration.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Accepted by SEC EDGAR 02/09/2026 - 10:17 AM Learn about SEC filing dates

UNITED STATES

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OMB Number:			3235-0080
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SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 25

NOTIFICATION OF REMOVAL FROM LISTING AND/OR REGISTRATION
UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT OF 1934.

Commission File Number

001-39319

Issuer:	Generation Bio Co.
Exchange:	Nasdaq Stock Market LLC

(Exact name of Issuer as specified in its charter, and name of Exchange where security is listed and/or registered)

Address:	301 Binney Street
	Cambridge	MASSACHUSETTS	02142
Telephone number:					617 655 7500

(Address, including zip code, and telephone number, including area code, of Issuer's principal executive offices)

Common Stock

(Description of class of securities)

Please place an X in the box to designate the rule provision relied upon to strike the class of securities from listing and registration:

17 CFR 240.12d2-2(a)(1)

17 CFR 240.12d2-2(a)(2)

17 CFR 240.12d2-2(a)(3)

17 CFR 240.12d2-2(a)(4)

Pursuant to 17 CFR 240.12d2-2(b), the Exchange has complied with its rules to strike the class of securities from listing and/or withdraw registration on the Exchange. ¹

Pursuant to 17 CFR 240.12d2-2(c), the Issuer has complied with its rules of the Exchange and the requirements of 17 CFR 240.12d-2(c) governing the voluntary withdrawal of the class of securities from listing and registration on the Exchange.

Pursuant to the requirements fo the Securities Exchange Act of 1934, Nasdaq Stock Market LLC certifies that it has reasonable grounds to believe that it meets all of the requirements for filing the Form 25 and has caused this notification to be signed on its behalf by the undersigned duly authorized person.

2026-02-09	By	Tara Petta		AVP
Date		Name		Title

¹ Form 25 and attached Notice will be considered compliance with the provisions of 17 CFR 240.19d-1 as applicable. See General Instructions.

Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.