Equillium (EQ) grants 500K stock options to Sr. Vice President and COO

Rhea-AI Filing Summary

Equillium, Inc. reported that Sr. Vice President and COO Christine Zedelmayer received an employee stock option grant on 01/07/2026. The derivative award covers 500,000 stock options with an exercise price of $1.31 per share, allowing her to buy common stock at that price in the future. The grant was reported at a cost of $0 for the option itself and leaves her with 500,000 derivative securities beneficially owned directly after the transaction.

According to the vesting terms, 25% of the option vests on the first anniversary of the vesting commencement date, and the remaining options vest in 36 equal monthly installments over the following three years, resulting in a standard four-year vesting schedule tied to ongoing service.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

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Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Zedelmayer Christine

(Last) (First) (Middle)

2223 AVENIDA DE LA PLAYA, SUITE 105

(Street)

LA JOLLA CA 92037

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
Equillium, Inc. [ EQ ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	Sr. Vice President and COO

3. Date of Earliest Transaction (Month/Day/Year)
01/07/2026

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares
Employee Stock Option (right to buy)	$1.31	01/07/2026		A		500,000		(1)	01/06/2036	Common Stock	500,000	$0	500,000	D

Explanation of Responses:

1. Twenty-five percent of the shares subject to the option vests on the first anniversary of the vesting commencement date, and the remainder vests in 36 equal monthly installments thereafter for the following three years.

	/s/ Christine Zedelmayer	01/09/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
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FAQ

What insider transaction did Equillium (EQ) report in this Form 4?

The filing shows that Sr. Vice President and COO Christine Zedelmayer received an employee stock option grant covering 500,000 derivative securities on 01/07/2026.

What are the key terms of Christine Zedelmayers stock options at Equillium (EQ)?

The options are an Employee Stock Option (right to buy) for 500,000 shares of common stock with an exercise price of $1.31 per share and an expiration date of 01/06/2036.

How do the newly granted Equillium (EQ) stock options vest for the COO?

The filing states that 25% of the shares vest on the first anniversary of the vesting commencement date, and the remaining shares vest in 36 equal monthly installments over the following three years.

Does the Equillium (EQ) Form 4 indicate a purchase price for the stock options?

Yes. The options have a conversion or exercise price of $1.31 per share, while the price of the derivative security itself is listed as $0 in the transaction details.

What is Christine Zedelmayers ownership form for these Equillium (EQ) options?

The Form 4 reports that the 500,000 stock options are held with direct (D) ownership by Christine Zedelmayer following the transaction.

What is Christine Zedelmayers role at Equillium (EQ) according to the Form 4?

The reporting person is identified as an officer of Equillium, Inc., holding the title of Sr. Vice President and COO, and is not listed as a director or 10% owner.