Schedule 13G ownership disclosure

BOUNDLESS BIO INC

COMMON STOCK · CUSIP: 10170A100

Event date: 2025-12-31

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares
Unavailable
Percent of class
Unavailable
  • FMR LLC

    Shares: 2,684,022.00 · Class: 12.0%

  • Abigail P. Johnson

    Shares: 2,684,022.00 · Class: 12.0%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.

Source: SEC EDGAR filing

Filing metadata

Accession number
0000315066-26-000366
Form type
SCHEDULE 13G/A
Filer
Boundless Bio, Inc.
CIK
CIK 1782303
Filed
Feb 05, 2026
Reporting period
Dec 31, 2025
Description
Schedule 13G beneficial ownership

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