Madison Avenue Partners, LP - 31 Mar 2026 SCHEDULE 13G/A Report for Magnera Corporation Common Stock, $0.01 par value per share (the "Common Stock") (MAGN)

Filing manager
Madison Avenue Partners, LP
Reporting owner
Madison Avenue International LP
Security
Magnera Corporation Common Stock, $0.01 par value per share (the "Common Stock")
Beneficially owned shares
1,590,616 shares
Ownership signal CIK-linked ownership evidence from parsed SEC filings. 2 signals
Large-stake signal

Form

SCHEDULE 13G/A

Passive or exempt beneficial ownership filing.

Ownership

4.4%

Beneficial ownership of this reported class.

Shares

1,590,616 shares

Shares beneficially owned as disclosed.

Event date

31 Mar 2026

Date tied to the ownership event or amendment.

Accepted by SEC

15 May 2026

EDGAR acceptance date.

How to read this large-stake filing
  • Schedule 13D/G filings focus on beneficial ownership stakes, not a full portfolio.
  • Compare this filing with the holder history and issuer page before treating the percentage as a current position.
  • Use amendments to understand whether the disclosed stake increased, decreased, or changed reporting status.
Class ownership
4.4%
Subject security Names, identifiers, and filing context for this profile. 2 source fields
Symbol
MAGN
Shares outstanding
36,150,364 shares
Source evidence Original filing metadata and source links for verification. 5 source fields
SEC form
SCHEDULE 13G/A
Accepted by SEC
15 May 2026, 09:25:20 UTC
Event date
31 Mar 2026
Prior SEC filing
17 Feb 2026
Source filing
View source filing

Key filing fact

Madison Avenue Partners, LP disclosed 4.4% ownership in Magnera Corporation Common Stock, $0.01 par value per share (the "Common Stock") (MAGN) on 31 Mar 2026.

Key facts

  • Madison Avenue Partners, LP filed SCHEDULE 13G/A for Magnera Corporation Common Stock, $0.01 par value per share (the "Common Stock") (MAGN).
  • Disclosed ownership: 4.4%.
  • Date of event: 31 Mar 2026.

Change

  • Previous schedule filing date: 17 Feb 2026.
  • Current filing was accepted on 15 May 2026, 09:25.

Research use

  • This page turns one Schedule 13D/G filing into a quick large-stake read before the raw reporting-person rows.
  • Use the linked SEC filing as the source of truth for ownership percentages, shares, and reporting-party details.

Evidence

Backed by Schedule 13D/13G

Beneficial ownership values are sourced from the original SEC Schedule 13D/13G filing.

View source filing

Reporting persons

Disclosed reporting parties (6)

Names, ownership percentages, voting power, signatures, titles, and CIKs as disclosed in this Schedule 13D/G filing.

Name Ownership Shares owned Sole voting power Shared voting power Signature Title CIK
Madison Avenue International LP 4.4% 1,590,616 0 1,590,616 /s/ Eli Samaha Eli Samaha, as Manager of Madison Avenue GP, LLC, the General Partner of Madison Avenue International LP
Madison Avenue Partners, LP 4.4% 1,590,616 0 1,590,616 /s/ Eli Samaha Eli Samaha, as Managing Member of EMAI Management, LLC, the General Partner of Madison Avenue Partners, LP
EMAI Management, LLC 4.4% 1,590,616 0 1,590,616 /s/ Eli Samaha Eli Samaha, as Managing Member
Madison Avenue GP, LLC 4.4% 1,590,616 0 1,590,616 /s/ Eli Samaha Eli Samaha, as Manager
Caraway Jackson Investments LLC 4.4% 1,590,616 0 1,590,616 /s/ Eli Samaha Eli Samaha, as Member
Eli Samaha 4.4% 1,590,616 0 1,590,616 /s/ Eli Samaha ELI SAMAHA
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