[8-K] Equillium, Inc. Reports Material Event

Rhea-AI Filing Summary

Equillium, Inc. furnished an 8‑K announcing financial results for the third quarter ended September 30, 2025, via a press release attached as Exhibit 99.1. The company states the information under Item 2.02, including the exhibit, is furnished and not deemed filed under Section 18 of the Exchange Act, and it is not incorporated by reference into other SEC filings except as expressly specified by reference.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 13, 2025

Equillium, Inc.

(Exact name of Registrant as Specified in Its Charter)

Delaware	001-38692	82-1554746
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(IRS Employer Identification No.)

2223 Avenida de la Playa Suite 105 La Jolla, CA		92037
(Address of Principal Executive Offices)		(Zip Code)

Registrant’s Telephone Number, Including Area Code: (858) 240-1200

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
Common Stock, par value $0.0001 per share		EQ		The Nasdaq Capital Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 2.02 Results of Operations and Financial Condition.

On November 13, 2025, Equillium, Inc. (the “Company”) announced its financial results for the third quarter ended September 30, 2025 in the press release attached hereto as Exhibit 99.1 and incorporated herein by reference.

The information in this Item 2.02 of this Current Report on 8-K, including Exhibit 99.1, is furnished and shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or subject to the liabilities of that section or Sections 11 and 12(a)(2) of the Securities Act of 1933, as amended. The information shall not be deemed incorporated by reference into any other filing with the Securities and Exchange Commission made by the Company, whether made before or after today’s date, regardless of any general incorporation language in such filing, except as shall be expressly set forth by specific references in such filing.

Item 9.01 Financial Statements and Exhibits.

(d)		Exhibit Number		Description.
		99.1		Press release, dated November 13, 2025.
		104		Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	EQUILLIUM, INC.
Date: November 13, 2025	By: /s/ Bruce D. Steel
	Bruce D. Steel
	Chief Executive Officer

FAQ

What did Equillium (EQ) announce in this 8‑K?

Equillium announced its financial results for the third quarter ended September 30, 2025, provided in a press release furnished as Exhibit 99.1.

Where can I find the detailed Q3 2025 results for Equillium (EQ)?

Details are in the press release attached as Exhibit 99.1 to the 8‑K.

Is the Q3 2025 press release considered filed with the SEC?

No. The Item 2.02 information, including Exhibit 99.1, is furnished and not deemed filed under Section 18 of the Exchange Act.

Is the information incorporated by reference into other SEC filings?

It is not incorporated by reference unless expressly set forth by specific reference in another filing.

What is Equillium’s trading symbol and exchange?

Equillium’s common stock trades on The Nasdaq Capital Market under the symbol EQ.

Which 8‑K items are included?

Item 2.02 (Results of Operations and Financial Condition) and Item 9.01 (Financial Statements and Exhibits).