SCHEDULE 13G/A

ALT5 Sigma Corp

Common Stock, $0.001 par value per share · CUSIP: 47089W104

Event date: 2025-09-30

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

• JANE STREET GROUP, LLC

  Shares: 6,373,317.00 · Class: 5.8%

• Jane Street Capital, LLC

  Shares: 484,389.00 · Class: 0.4%

• Jane Street Options, LLC

  Shares: 714,565.00 · Class: 0.7%

• Jane Street Global Trading, LLC

  Shares: 5,174,363.00 · Class: 4.7%

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