SCHEDULE 13G

Applied Optoelectronics Inc

Common Stock, Par value $0.001 · CUSIP: 03823U102

Event date: 2026-03-17

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: 4,097,237.00 · Class: 5.3%

• Jane Street Capital, LLC

  Shares: 1,864,091.00 · Class: 2.4%

• Jane Street Options, LLC

  Shares: 149,300.00 · Class: 0.2%

• Jane Street Global Trading, LLC

  Shares: 2,083,846.00 · Class: 2.7%

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