SYNLOGIC files Form 25 to delist Common Stock

SYNLOGIC, Inc. submitted a Form 25 notification with Nasdaq Stock Market LLC to remove its Common Stock from listing and withdraw its registration under Section 12(b) of the Exchange Act.

Accepted by SEC EDGAR 05/18/2026 - 10:54 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

SYNLOGIC, Inc. submitted a Form 25 notification with Nasdaq Stock Market LLC to remove its Common Stock from listing and withdraw its registration under Section 12(b) of the Exchange Act. The Exchange certified compliance with the rules governing voluntary withdrawal and signed the notice on behalf of Nasdaq.

Key Figures

Commission File Number: 001-37566 Form type: Form 25 Exchange: Nasdaq Stock Market LLC +3 more

6 metrics

Commission File Number 001-37566 Form 25 cover identification

Form type Form 25 Notification of removal from listing and/or registration

Exchange Nasdaq Stock Market LLC Exchange certifying withdrawal

Security class Common Stock Class of securities being removed from listing

Contact telephone 617-401-9947 Issuer principal office contact

Expires line date March 31, 2018 Header expiration date shown on form

Key Terms

Form 25, Section 12(b), withdraw registration, 17 CFR 240.12d2-2

4 terms

Form 25 regulatory

"FORM 25 NOTIFICATION OF REMOVAL FROM LISTING"

A Form 25 is an official filing with the U.S. Securities and Exchange Commission used to remove a company's stock or other security from a national exchange list. Investors should care because delisting often means less visibility, lower trading volume and wider price swings—similar to a product moving from a major supermarket to a small local market, which can make buying, selling and valuing the security more difficult.

Section 12(b) regulatory

"UNDER SECTION 12(b) OF THE SECURITIES EXCHANGE ACT"

Section 12(b) of the U.S. Securities Exchange Act requires securities listed on a national stock exchange to be registered with the U.S. Securities and Exchange Commission (SEC) and to follow regular public reporting and disclosure rules. For investors, a 12(b) listing generally means more routine financial updates, regulatory oversight and easier buying and selling—like a storefront that must display its inventory and prices, making it simpler to inspect and trade the product.

withdraw registration regulatory

"withdraw registration on the Exchange"

17 CFR 240.12d2-2 regulatory

"Pursuant to 17 CFR 240.12d2-2(c)"

A U.S. Securities and Exchange Commission rule that describes the conditions and procedural steps for a security to be removed from public registration or reporting under the Securities Exchange Act of 1934. For investors, it matters because it explains when a company’s shares can stop being subject to regular disclosure and exchange listing rules — similar to knowing when a publicly tracked product will be discontinued and no longer send updates, which affects transparency and liquidity.

FAQ

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

What does SYNLOGIC (SYBX) filing a Form 25 mean?

Filing a Form 25 notifies the SEC that Nasdaq will remove and withdraw registration of the issuer's listed class. It means Nasdaq has certified compliance with the withdrawal rules under Section 12(b) and the issuer has completed the voluntary withdrawal procedures.

Which security and exchange are affected by SYNLOGIC's Form 25?

The filing covers the issuer's Common Stock listed on the Nasdaq Stock Market LLC. Nasdaq certified it met the procedural requirements to strike the class from listing and withdraw registration under the referenced Exchange Act rules.

Who signed the Form 25 on behalf of Nasdaq in the SYNLOGIC filing?

The Form 25 in the excerpt is signed by Aravind Menon, identified as a Hearings Advisor for Nasdaq. The notice states Nasdaq caused the notification to be signed by a duly authorized person on its behalf.

Does the Form 25 excerpt state whether the removal is voluntary?

The excerpt states the issuer and the Exchange complied with rules governing the voluntary withdrawal of the class from listing and registration under 17 CFR 240.12d2-2(c), indicating the withdrawal followed the voluntary procedure referenced in the filing.

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

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UNITED STATES

OMB APPROVAL

OMB Number:			3235-0080
Expires:	March 31, 2018
Estimated average burden
hours per response:			1.7

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

001-37566

Issuer:	SYNLOGIC, INC.
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:	200 Sidney St., Suite 320
	Cambridge	MASSACHUSETTS	02139
Telephone number:					617-401-9947

(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.

2026-05-18	By	Aravind Menon		Hearings Advisor
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.