[Form 4] Equillium, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Equillium, Inc. disclosed that chairman and director Daniel Bradbury received a grant of stock options covering 70,000 shares of common stock. The options have an exercise price of $2.84 per share and expire on May 27, 2036.

The award vests in twelve equal monthly installments beginning on May 28, 2026, and will in any case be fully vested on the date of Equillium’s next annual meeting of stockholders following the grant date. This is a compensation-related equity grant, not an open-market share purchase or sale.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider BRADBURY DANIEL

Role CHAIRMAN

Type	Security	Shares	Price	Value
Grant/Award	Director stock option (right to buy)	70,000	$0.00	--

Holdings After Transaction: Director stock option (right to buy) — 70,000 shares (Direct, null)

Footnotes (1)

1. [object Object]

Key Figures

Option grant size: 70,000 options Exercise price: $2.84 per share Expiration date: May 27, 2036 +2 more

5 metrics

Option grant size 70,000 options Director stock option grant to Daniel Bradbury

Exercise price $2.84 per share Exercise price for Bradbury’s stock options

Expiration date May 27, 2036 Option expiration for 70,000-share grant

Vesting schedule 12 monthly installments Vesting begins May 28, 2026

Shares underlying options 70,000 shares Common stock underlying the option grant

Key Terms

Director stock option, exercise price, vesting, annual meeting of stockholders, +1 more

5 terms

Director stock option financial

"Director stock option (right to buy)"

exercise price financial

"conversion_or_exercise_price": "2.8400""

The exercise price is the fixed amount at which you can buy or sell an asset, like a stock, when using an options contract. It matters because it helps determine whether exercising the option will be profitable or not, depending on the current market price. Think of it as the set price you agree on today to buy or sell later.

vesting financial

"The option vests in twelve equal monthly installments"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

annual meeting of stockholders financial

"fully vested on the date of the Issuer's annual meeting of stockholders"

stock option grant financial

"The option vests in twelve equal monthly installments"

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Form 4 Insider Transactions: What Each Field Means →

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

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

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^*

BRADBURY DANIEL

(Last) (First) (Middle)

2223 AVENIDA DE LA PLAYA, SUITE 105

(Street)

LA JOLLA CALIFORNIA 92037

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

X	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	CHAIRMAN

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
05/28/2026

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

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

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

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
Director stock option (right to buy)	$2.84	05/28/2026		A		70,000		(1)	05/27/2036	Common Stock	70,000	$0	70,000	D

Explanation of Responses:

1. The option vests in twelve equal monthly installments commencing on the grant date of May 28, 2026, provided that the option will, in any case, be fully vested on the date of the Issuer's annual meeting of stockholders following the grant date.

	/s/ Daniel Bradbury	05/29/2026
	** 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).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
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.
* Form 4: SEC 1474 (03-26)