Jane Street Group, LLC and Jane Street Capital, LLC filed an amended beneficial ownership statement with the SEC on November 6, 2026, reporting a combined 2.5% stake in Cerebras Systems Inc. as of September 30, 2026.

Key Highlights

  • Reporting persons: Jane Street Group, LLC (Delaware holding company) and its subsidiary Jane Street Capital, LLC (Delaware registered broker-dealer), both located at 250 Vesey Street, 3rd Floor, New York, NY 10281.
  • Shares reported: 2,797,771 shares of Cerebras Systems Inc. Class A common stock, $0.00001 par value per share (CUSIP 15675D103), beneficially owned in aggregate by each reporting person.
  • Ownership percentage: 2.5% of the class, representing ownership of 5 percent or less, as stated in the filing.
  • Voting and dispositive power: Both Jane Street Group, LLC and Jane Street Capital, LLC report zero sole voting power and zero sole dispositive power, with all 2,797,771 shares held under shared voting and shared dispositive power.
  • Triggering event date: The date of the event requiring this filing was September 30, 2026.
  • Certification language: The filers certified that the securities "were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer."

Jane Street's Reported Position in Cerebras Systems Class A Shares

According to the filing, Jane Street Group, LLC serves as the parent holding company and Jane Street Capital, LLC is identified as its subsidiary, classified as a broker-dealer registered under Section 15 of the Securities Exchange Act. Cerebras Systems Inc., the issuer, is headquartered at 1237 E. Arques Ave., Sunnyvale, California 94085, and its Class A common stock trades on NASDAQ:CBRS.

The amended filing, designated Amendment No. 1, reports that as of September 30, 2026, both reporting persons beneficially owned 2,797,771 shares of Cerebras Systems Class A common stock. All reported shares are held under shared voting and shared dispositive power, with no sole voting or dispositive authority claimed by either entity. The filing notes the ownership represents 2.5% of the class and falls within the "ownership of 5 percent or less" category under Item 5.

Jeremy Kahn signed the statement as Authorized Signatory on behalf of both Jane Street Group, LLC and Jane Street Capital, LLC on November 6, 2026. The filing indicates that Item 6 (ownership on behalf of another person) and Item 8 (group membership) are listed as not applicable, and no group dissolution notice was filed under Item 9.

What Was Disclosed

Jane Street Group, LLC and Jane Street Capital, LLC disclosed beneficial ownership of 2,797,771 shares, or 2.5%, of Cerebras Systems Inc. Class A common stock as of September 30, 2026, through an amended beneficial ownership statement filed November 6, 2026.