Skip to main content
Livermore
Livermore
ZHEN

Magnera Corp

MAGN
Exchange
NYSE
Industry
Paper Mills
SEC CIK
0000041719

No open-market purchases or sales by Magnera Corp insiders were filed in the last 90 days; 179 institutions reported holding it in 13F filings for Q2 2026, worth $427.2M in total; no superinvestor holds it.

Holders of 5% or more of MAGN

Holders whose latest Schedule 13D or 13G filing reports 5% or more of Magnera Corp, largest stake first. The change is against the holder's previous filing.

Holders of 5% or more of MAGN
HolderLatest formStakeChangeFirst filedLatest filingFiling
Newtyn Management, LLC13G/A7.70%2.76M shares+1.30 ppfrom 6.40%Aug 14, 20252 filingsMay 15, 2026SEC
BlackRock, Inc.13G7.10%2.52M sharesNewJul 17, 20251 filingJul 17, 2025SEC

Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.

13D and 13G filings

26 Schedule 13D and 13G filings on Magnera Corp, newest first, including old-format filings without a stake.

Schedule 13D and 13G filings on MAGN
Filed (ET)FilerFormStakeChangeEvent dateFiling
Aug 12, 20265:00 PM ETMorgan Stanleyand 1 other13G/A3.90%1.39M shares−1.40 ppfrom 5.30%Below 5%Jun 30, 2026SEC
Aug 5, 20264:25 PM ETCetus Capital VI, L.P.13G/A4.36%1.56M shares−1.90 ppfrom 6.26%Below 5%Jul 28, 2026SEC
May 15, 20264:15 PM ETNewtyn Management, LLC13G/A7.70%2.76M shares+1.30 ppfrom 6.40%Mar 31, 2026SEC
May 15, 20269:25 AM ETMadison Avenue Partners, LPand 5 others13G/A4.40%1.59M shares−0.60 ppfrom 5.00%Below 5%Mar 31, 2026SEC
May 12, 202610:49 AM ETMorgan Stanleyand 1 other13G/A5.30%1.89M shares−1.20 ppfrom 6.50%Mar 31, 2026SEC
May 12, 20266:03 AM ETCetus Capital VI, L.P.13G/A6.26%2.24M shares−1.62 ppfrom 7.88%Mar 31, 2026SEC
Mar 27, 202610:31 AM ETVanguard Group Inc13G/A0.00%0 shares−6.65 ppfrom 6.65%Below 5%Mar 13, 2026SEC
Feb 17, 20265:06 PM ETMadison Avenue Partners, LPand 5 others13G/A5.00%1.78M shares−3.00 ppfrom 8.00%Dec 31, 2025SEC
Feb 13, 202610:51 AM ETAncora Advisors, LLC13G1.50%533.2K shares−3.83 ppfrom 5.33%Below 5%Dec 31, 2025SEC
Feb 12, 202611:04 AM ETMorgan Stanley13G6.50%2.32M shares+2.10 ppfrom 4.40%Dec 31, 2025SEC
Nov 14, 202510:18 AM ETMadison Avenue Partners, LPand 5 others13G/A8.00%2.83M shares–Sep 30, 2025SEC
Nov 7, 202512:12 PM ETMorgan Stanley13G/A4.40%1.55M shares−1.00 ppfrom 5.40%Below 5%Sep 30, 2025SEC
Aug 14, 20254:05 PM ETNewtyn Management, LLC13G6.40%2.27M sharesNewJun 30, 2025SEC
Aug 8, 20254:47 PM ETCetus Capital VI, L.P.13G/A7.88%2.80M shares+2.75 ppfrom 5.13%Jun 30, 2025SEC
Aug 6, 20252:11 PM ETMorgan Stanley13G5.40%1.94M sharesNewJun 30, 2025SEC
Jul 29, 20251:54 PM ETVanguard Group Inc13G/A6.65%2.37M shares−1.51 ppfrom 8.16%Jun 30, 2025SEC
Jul 17, 20257:54 PM ETBlackRock, Inc.13G7.10%2.52M sharesNewJun 30, 2025SEC
Feb 11, 20254:15 PM ETCetus Capital VI, L.P.13G5.13%1.82M shares+1.15 ppfrom 3.98%Feb 5, 2025SEC
Feb 11, 20254:05 PM ETCetus Capital VI, L.P.13G/A3.98%1.41M shares–Below 5%Dec 31, 2024SEC
Jan 30, 20259:58 PM ETVanguard Group Inc13G/A8.16%2.88M shares–Dec 31, 2024SEC
Jan 7, 20254:50 PM ETAncora Advisors, LLC13G5.33%1.88M sharesNewDec 31, 2024SEC
Feb 16, 2021Silvercrest Asset Management Group LLC13G/AOld format–––SEC
Feb 12, 2021Dimensional Fund Advisors LP13GOld format–New–SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Feb 10, 2021Vanguard Group Inc13G/AOld format–––SEC
Feb 4, 2021Franklin Mutual Advisers LLC13G/AOld format–––SEC

Form 144: proposed insider sales

Notices from officers, directors and other affiliates planning to sell Magnera Corp shares.

No Form 144 notices for Magnera Corp are on file.