Penny Tom - 28 May 2026 Form 4 Insider Report for Equillium, Inc. (EQ)

Reporting relationship: Principal Accounting Officer
Issuer ticker: EQ
Reported as of: 28 May 2026
Net transaction value: -$191,750
SEC form: 4
Accepted by SEC: 29 May 2026, 18:28:50 UTC
Prior SEC filing: 09 Jan 2026
Source filing: View source filing
Reporting owner signature: /s/ Penny Tom

Key filing fact

Penny Tom filed Form 4 for Equillium, Inc. (EQ) on 29 May 2026.

Key facts

This page summarizes Penny Tom's Form 4 filing for Equillium, Inc. (EQ).
3 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 29 May 2026, 18:28.

Change

Previous filing in this sequence was filed on 09 Jan 2026.
Current net transaction value: -$191,750.

Research use

This tells you what this filing adds before you inspect full transaction and derivative tables.
You can trace every row back to the original SEC filing document.

Evidence

Filed on Form 4

Ownership activity is grounded in SEC Form 4 disclosures.

View source filing

Reporting Owners (1)

CIK 0002012180 Primary reporting owner

Tom Penny

Relationship: Principal Accounting Officer
Address: 2223 AVENIDA DE LA PLAYA, SUITE 105, LA JOLLA
Signature: /s/ Penny Tom
Signature date: 29 May 2026

Reported non-derivative transactions

Shares, units, or other non-derivative securities reported in this filing.

EQ transaction

Common Stock

Options Exercise

Transaction value
Shares: +65,000
Change %
Price: $0.7850^*
Shares after: 65,000
Date: 28 May 2026
Ownership: Direct

EQ transaction

Common Stock

Sale

Transaction value: $191,750
Shares: -65,000
Change %: -100%
Price: $2.95
Shares after: 0
Date: 28 May 2026
Ownership: Direct
Footnotes: F1, F2

Reported derivative securities

Options, warrants, convertible securities, or similar derivative positions disclosed in the filing.

EQ transaction Derivative

Employee Stock Option (right to buy)

Options Exercise

Transaction value
Shares: -65,000
Change %: -100%
Price: $0.000000^*
Shares after: 0
Date: 28 May 2026
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 65,000
Exercise price: $0.7850
Footnotes: F3

^* marks a reported price that did not pass the local price check.

Additional SEC filing notes

Filing notes and footnotes

Rule 10b5-1 trading plan

These transactions were reported as open-market trades under a Rule 10b5-1 plan. The plan lets an insider set trading instructions in advance, which can reduce the risk of trading while in possession of material nonpublic information.

Original filing language: transaction made pursuant to a contract, instruction, or written plan intended to satisfy Rule 10b5-1(c).

Explanation of responses 3 footnotes

Footnote F1

The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on October 10, 2025.

Footnote F2

The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $2.95 to $2.99, inclusive. The reporting person undertakes to provide to the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range.

Footnote F3

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.