SCHEDULE 13G/A

Magnera Corp

Common Stock, $0.01 par value per share (the "Common Stock") · CUSIP: 55939A107

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

• Madison Avenue Partners, LP

  Shares: 2,832,281 · Class: 8%

• Madison Avenue International LP

  Shares: 2,832,281 · Class: 8%

• EMAI Management, LLC

  Shares: 2,832,281 · Class: 8%

• Madison Avenue GP, LLC

  Shares: 2,832,281 · Class: 8%

• Caraway Jackson Investments LLC

  Shares: 2,832,281 · Class: 8%

• Eli Samaha

  Shares: 2,832,281 · Class: 8%

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