SCHEDULE 13G

Annexon Inc

Common Stock · CUSIP: 03589W102

Event date: 2025-04-21

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

• Logos Global Management LP

  Shares: 6,600,000.00 · Class: 6.0%

• Logos Global Management GP LLC

  Shares: 6,600,000.00 · Class: 6.0%

• Logos Global Master Fund LP

  Shares: 6,600,000.00 · Class: 6.0%

• Logos GP LLC

  Shares: 6,600,000.00 · Class: 6.0%

• Arsani William

  Shares: 6,600,000.00 · Class: 6.0%

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