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Shuttingdown

Arcellx, Inc.

Biological Products, (No Diagnostic Substances) · REDWOOD CITY · CA

No longer listed

High confidence (85%)

Updated Oct 18, 2026, 12:04 AM

What is happening

Derived by rule set status-rules-2026.09.7

The company deregistered its securities and stopped filing with the SEC. Companies do that when they are acquired, when they go private, and when they fail; the filing does not say which.

Latest material event: Arcellx, Inc. deregistered its securities (May 8, 2026)

Timeline

Every material event, newest first. History is never overwritten.

  1. Arcellx, Inc. deregistered its securities

    May 8, 2026

    Registration withdrawn

    • SEC EDGAR — “15-12G 1 tm2613951d1_1512g.htm 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File No. 001-41259 Arcellx, Inc. (Exact name of registrant as specified in its charter) 800 Bridge Parkway Redwood City, California 94065 (240) 327-0630 (Address, including zip code, and telephone number, including area code, of registrant’s pr…”

  2. Arcellx, Inc. received a delisting notice from its exchange

    Apr 28, 2026

    Delisting notice received

    • SEC EDGAR — “Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. The information set forth in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 3.01. In connection with the consummation of the Transactions, the Company notified Nasdaq Stock Market LLC ( NASDAQ ) of the consummation of the Merger and requested that NASDAQ suspend trading of Shares and file with the SEC a Form 25 Notification of Removal from Listing and/or Registration to delist and deregister Shares under Section 12(b…”

  3. Arcellx, Inc. was delisted from its exchange

    Apr 28, 2026

    Delisting effective

    • SEC EDGAR — “X0203 0001354457 Nasdaq Stock Market LLC 0001786205 Arcellx, Inc. 001-41259 25 West Watkins Mill Road Suite A Gaithersburg MD MARYLAND 20878 240-327-0603 Common Stock 17 CFR 240.12d2-2(a)(3) Tara Petta AVP 2026-04-28”

Company information

Founded
—
Employees (estimate)
—
Industry
Biological Products, (No Diagnostic Substances)
Subindustry
—
SEC CIK
0001786205
Website
—
LinkedIn
—
Headquarters
REDWOOD CITY, CA
Also known as
—
Legal entities
Arcellx, Inc.

Sources

Every material source used to build this profile.

  • SEC Company Submissions (TIER 1 · UNVERIFIED)

    Arcellx, Inc. — Biological Products, (No Diagnostic Substances) (SIC 2836) — REDWOOD CITY, CA
    View source record

  • SEC EDGAR (TIER 1 · UNVERIFIED)

    15-12G 1 tm2613951d1_1512g.htm 15-12G UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 15 CERTIFICATION AND NOTICE OF TERMINATION OF REGISTRATION UNDER SECTION 12(g) OF THE SECURITIES EXCHANGE ACT OF 1934 OR SUSPENSION OF DUTY TO FILE REPORTS UNDER SECTIONS 13 AND 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934. Commission File No. 001-41259 Arcellx, Inc. (Exact name of registrant as specified in its charter) 800 Bridge Parkway Redwood City, California 94065 (240) 327-0630 (Address, including zip code, and telephone number, including area code, of registrant’s pr…
    View source record

  • SEC EDGAR (TIER 1 · UNVERIFIED)

    X0203 0001354457 Nasdaq Stock Market LLC 0001786205 Arcellx, Inc. 001-41259 25 West Watkins Mill Road Suite A Gaithersburg MD MARYLAND 20878 240-327-0603 Common Stock 17 CFR 240.12d2-2(a)(3) Tara Petta AVP 2026-04-28
    View source record

  • SEC EDGAR (TIER 1 · UNVERIFIED)

    Item 3.01. Notice of Delisting or Failure to Satisfy a Continued Listing Rule or Standard; Transfer of Listing. The information set forth in the Introductory Note and Item 2.01 of this Current Report on Form 8-K is incorporated by reference into this Item 3.01. In connection with the consummation of the Transactions, the Company notified Nasdaq Stock Market LLC ( NASDAQ ) of the consummation of the Merger and requested that NASDAQ suspend trading of Shares and file with the SEC a Form 25 Notification of Removal from Listing and/or Registration to delist and deregister Shares under Section 12(b…
    View source record

Status history

Every derived status, with the rule that produced it.

  • DISTRESS_SIGNAL → NO_LONGER_LISTEDPUBLIC_LISTING_ENDED · Sep 18, 2026, 01:29 AM

    The company deregistered its securities and stopped filing with the SEC. Companies do that when they are acquired, when they go private, and when they fail; the filing does not say which.

  • DISTRESS_SIGNAL → DISTRESS_SIGNALLISTING_STANDARDS_WARNING · Sep 18, 2026, 01:13 AM

    An exchange warned the company it no longer meets the listing standards. Companies regain compliance often.

  • DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 15, 2026, 12:33 PM

    The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.

  • DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 14, 2026, 04:47 PM

    The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.

  • DISTRESS_SIGNAL → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 8, 2026, 04:35 AM

    The company stopped being publicly listed. That happens to failing companies and to acquired ones alike.

  • UNKNOWN → DISTRESS_SIGNALPUBLIC_LISTING_ENDED · Sep 8, 2026, 04:35 AM

    An exchange warned the company it no longer meets the listing standards. Companies regain compliance often.