SCHEDULE 13G/A

First Solar Inc

Common stock, $0.001 par value · CUSIP: 336433107

Event date: 2026-09-30

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: 7,264,895.00 · Class: 6.8%

• Jane Street Capital, LLC

  Shares: 6,590,261.00 · Class: 6.1%

• Jane Street Global Trading, LLC

  Shares: 674,405.00 · Class: 0.6%

• Jane Street Singapore Pte. Ltd

  Shares: 229.00 · Class: 0.0%

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