Christine Zedelmayer - 23 Dec 2025 Form 4 Insider Report for Equillium, Inc. (EQ)

Signature
/s/ Daniel M. Bradbury, Attorney-in-Fact
Issuer symbol
EQ
Transactions as of
23 Dec 2025
Net transactions value
-$71,500
Form type
4
Filing time
23 Dec 2025, 16:24:05 UTC
Previous filing
15 Dec 2025

Reporting Owners (1)

Name Relationship Address Signature Signature date CIK
Zedelmayer Christine Sr. Vice President and COO 2223 AVENIDA DE LA PLAYA, SUITE 105, LA JOLLA /s/ Daniel M. Bradbury, Attorney-in-Fact 23 Dec 2025 0001797818

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction EQ Common Stock Options Exercise $78,500 +100,000 +109% $0.7850 191,444 23 Dec 2025 Direct
transaction EQ Common Stock Sale $150,000 -100,000 -52% $1.50 91,444 23 Dec 2025 Direct F1

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
transaction EQ Employee Stock Option (right to buy) Options Exercise $0 -100,000 -100% $0.000000 0 23 Dec 2025 Common Stock 100,000 $0.7850 Direct F2
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Buy Plan / Sale Plan: These are also open market purchases/sales of shares, but in this case the transaction is part of a trading plan. Rule 10b5-1 allows insiders to setup a trading plan to buy/sell stocks over a certain period of time. Since the purchases/sales are predetermined, this protects the insiders from violating insider trading law.

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).

Explanation of Responses:

Id Content
F1 The sale reported in this Form 4 was effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on August 27, 2025.
F2 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.