Michelle Gilson - 23 May 2025 Form 4 Insider Report for Arcellx, Inc. (ACLX)

Reporting relationship: CHIEF FINANCIAL OFFICER
Issuer ticker: ACLX
Reported as of: 23 May 2025
Net transaction value: -$784,777
SEC form: 4
Accepted by SEC: 28 May 2025, 20:18:05 UTC
Prior SEC filing: 10 Jan 2025
Next SEC filing: 06 Oct 2025
Source filing: View source filing
Reporting owner signature: /s/ Michelle Gilson

Key filing fact

Michelle Gilson filed Form 4 for Arcellx, Inc. (ACLX) on 28 May 2025.

Key facts

This page summarizes Michelle Gilson's Form 4 filing for Arcellx, Inc. (ACLX).
4 reported transactions and 1 derivative row are listed below.
Accepted by SEC: 28 May 2025, 20:18.

Change

Previous filing in this sequence was filed on 10 Jan 2025.
Current net transaction value: -$784,777.

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 0001930862 Primary reporting owner

Gilson Michelle

Relationship: CHIEF FINANCIAL OFFICER
Address: C/O ARCELLX, INC., 800 BRIDGE PARKWAY, REDWOOD CITY
Signature: /s/ Michelle Gilson
Signature date: 28 May 2025

Reported non-derivative transactions

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

ACLX transaction

Common Stock

Options Exercise

Transaction value: $0
Shares: +22,429
Change %: +234%
Price: $0.000000
Shares after: 32,011
Date: 23 May 2025
Ownership: Direct
Footnotes: F1

ACLX transaction

Common Stock

Sale

Transaction value: $240,868
Shares: -3,786
Change %: -12%
Price: $63.62
Shares after: 28,225
Date: 27 May 2025
Ownership: Direct
Footnotes: F2, F3

ACLX transaction

Common Stock

Sale

Transaction value: $543,909
Shares: -8,449
Change %: -30%
Price: $64.38
Shares after: 19,776
Date: 27 May 2025
Ownership: Direct
Footnotes: F2, F4

Reported derivative securities

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

ACLX transaction Derivative

Restricted Stock Units

Options Exercise

Transaction value: $0
Shares: -22,429
Change %: -100%
Price: $0.000000
Shares after: 0
Date: 23 May 2025
Ownership: Direct
Underlying class: Common Stock
Underlying amount: 22,429
Exercise price
Footnotes: F1, F5

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

Additional SEC filing notes

Filing notes and footnotes

Explanation of responses 5 footnotes

Footnote F1

Each restricted stock unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.

Footnote F2

Represents the number of shares sold to cover the tax withholding obligations in connection with the vesting of RSUs and does not represent a discretionary sale by the Reporting Person.

Footnote F3

Represents the weighted average share price of an aggregate total of 3,786 shares sold in the price range of $62.935 to $63.925 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Footnote F4

Represents the weighted average share price of an aggregate total of 8,449 shares sold in the price range of $63.925 to $ 64.785 by the Reporting Person. The Reporting Person undertakes to provide upon request by the Commission staff, the issuer or a security holder of the issuer, full information regarding the number of shares sold at each separate price.

Footnote F5

Subject to the Reporting Person continuing to be a Service Provider (as defined in the Issuer's 2022 Equity Incentive Plan) through each applicable vesting date, the RSUs shall vest annually over three (3) years with a cliff every twelve (12) months on the same day of the month as the Vesting Commencement Date (and if there is no corresponding day, on the last day of the month). "Vesting Commencement Date" shall mean May 23, 2022.