MAGNERA CORP MAGN
COM SHS · Common Stock · CUSIP 55939A107
- SectorMaterials
- IndustryPaper Mills
- HeadquartersCharlotte, NC
- Founded1864
- Websiteglatfelter.com
- FilingsSEC EDGAR
* Summed across managers. Shares that two managers' reports both contain – a subsidiary's holdings that its parent's report includes too, or a sub-adviser's in its client's – are counted once ($2.2m this quarter). Holder counts are more reliable. Shares outstanding: 35.8m as of 2026-08-06, from the company's own SEC filing; the percentage can still exceed 100%: lent-out shares are counted by the lender and the buyer, and some reports overlap without saying so. Implied quarter-end price ≈ $11.75. Options: 2 managers hold calls ($159.8k notional), 0 hold puts (—).
Trends to Q2 2026
Institutional holders
Managers reporting a position, each quarter
Numbers
| Quarter | Holders |
|---|---|
| Q3 2022 | 1 |
| Q4 2022 | 1 |
| Q1 2023 | 1 |
| Q2 2023 | 1 |
| Q3 2023 | 0 |
| Q4 2023 | 0 |
| Q1 2024 | 0 |
| Q2 2024 | 0 |
| Q3 2024 | 4 |
| Q4 2024 | 233 |
| Q1 2025 | 217 |
| Q2 2025 | 191 |
| Q3 2025 | 181 |
| Q4 2025 | 190 |
| Q1 2026 | 176 |
| Q2 2026 | 180 |
Buyers vs sellers
Managers adding to or starting a position, vs cutting or selling out
Numbers
| Quarter | Bought or added | Cut or sold out |
|---|---|---|
| Q3 2023 | 0 | 1 |
| Q4 2024 | 214 | 0 |
| Q1 2025 | 83 | 116 |
| Q2 2025 | 94 | 113 |
| Q3 2025 | 70 | 99 |
| Q4 2025 | 94 | 102 |
| Q1 2026 | 82 | 88 |
| Q2 2026 | 93 | 63 |
Calls vs puts
Options held, notional value, last 4 quarters. P/C = puts ÷ calls
Numbers
| Quarter | Calls | Puts | P/C |
|---|---|---|---|
| Q3 2025 | $6.9m | $5.9m | 0.85 |
| Q4 2025 | $994.7k | $99.9k | 0.10 |
| Q1 2026 | $1.6m | $0 | 0.00 |
| Q2 2026 | $159.8k | $0 | 0.00 |
Biggest buyers
| SG Americas Securities, LLC | New | +397.5k |
| AMERICAN CENTURY COMPANIES INC | Added | +378.9k |
| Assenagon Asset Management S.A. | Added | +375.5k |
| AQR CAPITAL MANAGEMENT LLC | Added | +334.0k |
| DIMENSIONAL FUND ADVISORS LP | Added | +317.4k |
| UBS Group AG | Added | +212.8k |
| BlackRock, Inc. | Added | +206.6k |
| PRIVATE MANAGEMENT GROUP INC | New | +186.7k |
| Verition Fund Management LLC | Added | +175.0k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | Added | +115.0k |
Biggest sellers
| LITTLEJOHN & CO LLC | Reduced | -536.7k |
| MORGAN STANLEY | Reduced | -433.6k |
| Ancora Advisors LLC | Reduced | -350.4k |
| Madison Avenue Partners, LP | Reduced | -288.6k |
| JPMORGAN CHASE & CO | Reduced | -217.9k |
| Russell Investments Group, Ltd. | Reduced | -202.8k |
| MILLENNIUM MANAGEMENT LLC | Sold out | -200.0k |
| CITADEL ADVISORS LLC | Reduced | -179.5k |
| TUDOR INVESTMENT CORP ET AL | Reduced | -121.8k |
| Trexquant Investment LP | Reduced | -112.1k |
Biggest calls
| SUSQUEHANNA INTERNATIONAL GROUP, LLP | Reduced | $155.1k13.2k shares |
| SIMPLEX TRADING, LLC | Reduced | $4.7k400 shares |
Biggest puts
| None |
Options at notional value: the value of the shares the contracts control, as filers report them, not what the options cost. Not included in the holders, shares or buying above.
Major shareholders (over 5%)
Anyone who owns more than 5% of a class of the company's shares has to say so: on Schedule 13D if they may try to influence or control the company, on 13G if they're a passive investor, and update it as the stake changes. Each holder's latest filing, from 19 Dec 2024 on; percentages are of the share class, as the holder worked them out.
| Holder | Stake |
|---|---|
| Newtyn Management, LLC 13G · institution +1.3 pts · filed 2026-05-15 | 7.7% |
| BlackRock, Inc. 13G · institution new · filed 2025-07-17 | 7.1% |
Fell to 5% or below in the last year: MORGAN STANLEY (3.9%, 2026-08-12), Cetus Capital VI, L.P. (4.4%, 2026-08-05), Madison Avenue Partners, LP (4.4%, 2026-05-15), VANGUARD GROUP INC (0.0%, 2026-03-27), Ancora Advisors LLC (1.5%, 2026-02-13)
Insider purchases and sales since 1 Apr 2026
Shares bought or sold by the company's own officers, directors and 10% owners, in the open market or privately, as they reported to the SEC on Form 4 (due within two business days of the trade). Grants, option exercises, shares withheld for tax and gifts aren't included.
Officers and directors buying vs selling
Number of people, by quarter (10% owners not included)
Numbers
| Quarter | Buying | Bought | Selling | Sold | Sold under a plan |
|---|---|---|---|---|---|
| Q4 2024 | 0 | — | 0 | — | — |
| Q1 2025 | 2 | $908.0k | 0 | — | — |
| Q2 2025 | 7 | $1.4m | 0 | — | — |
| Q3 2025 | 0 | — | 0 | — | — |
| Q4 2025 | 0 | — | 0 | — | — |
| Q1 2026 | 0 | — | 0 | — | — |
| Q2 2026 | 0 | — | 0 | — | — |
| Q3 2026 | 0 | — | 0 | — | — |
None reported since 1 Apr 2026.
Holders, Q2 2026
| Manager | Shares | Change |
|---|---|---|
| Newtyn Management, LLC 4.11% of their portfolio | 2.8m $32.9m | Added +40.0k |
| BlackRock, Inc. 0.00% of their portfolio | 2.6m $30.5m | Added +206.6k |
| Engine Capital Management, LP 2.57% of their portfolio | 2.2m $26.4m | Unchanged |
| LITTLEJOHN & CO LLC 28.25% of their portfolio | 1.9m $22.2m | Reduced -536.7k |
| VANGUARD CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 1.6m $18.4m | Added +29.8k |
| MORGAN STANLEY 0.00% of their portfolio | 1.5m $18.0m | Reduced -433.6k |
| Madison Avenue Partners, LP 0.66% of their portfolio | 1.3m $15.3m | Reduced -288.6k |
| Diameter Capital Partners LP 1.51% of their portfolio | 1.2m $14.2m | Unchanged |
| Assenagon Asset Management S.A. 0.01% of their portfolio | 1.1m $13.1m | Added +375.5k |
| DG Capital Management, LLC 4.48% of their portfolio | 1.1m $12.9m | Reduced -105.9k |
| GEODE CAPITAL MANAGEMENT, LLC 0.00% of their portfolio | 862.4k $10.1m | Added +82.1k |
| CANYON CAPITAL ADVISORS LLC 1.08% of their portfolio | 810.0k $9.5m | Unchanged |
| D. E. Shaw & Co., Inc. 0.01% of their portfolio | 789.7k $9.3m | Reduced -106.5k |
| Clearline Capital LP 0.56% of their portfolio | 741.1k $8.7m | Added +2.8k |
| STATE STREET CORP 0.00% of their portfolio | 671.9k $7.9m | Added +15.1k |
| JB CAPITAL PARTNERS LP 1.20% of their portfolio | 655.0k $7.7m | Unchanged |
| THOMPSON SIEGEL & WALMSLEY LLC 0.14% of their portfolio | 649.8k $7.6m | Added +75.5k |
| JPMORGAN CHASE & CO 0.00% of their portfolio | 610.9k $7.2m | Reduced -217.9k |
| Verition Fund Management LLC 0.05% of their portfolio | 607.3k $7.1m | Added +175.0k |
| JACOBS LEVY EQUITY MANAGEMENT, INC 0.03% of their portfolio | 601.6k $7.1m | Added +76.7k |
| AMERICAN CENTURY COMPANIES INC 0.00% of their portfolio | 600.0k $7.0m | Added +378.9k |
| AMERIPRISE FINANCIAL INC 0.00% of their portfolio | 578.5k $6.8m | Added +70.0k |
| DIMENSIONAL FUND ADVISORS LP 0.00% of their portfolio | 571.3k $6.7m | Added +317.4k |
| UBS Group AG 0.00% of their portfolio | 506.9k $6.0m | Added +212.8k |
| AQR CAPITAL MANAGEMENT LLC 0.00% of their portfolio | 479.5k $5.6m | Added +334.0k |
| ALGERT GLOBAL LLC 0.06% of their portfolio | 447.4k $5.3m | Added +53.8k |
| J. Goldman & Co LP 0.18% of their portfolio | 425.0k $5.0m | Added +37.7k |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC 0.00% of their portfolio | 423.3k $5.0m | Reduced -30.4k |
| Seven Six Capital Management, LLC 4.28% of their portfolio | 398.6k $4.7m | Added +23.7k |
| SG Americas Securities, LLC 0.00% of their portfolio | 397.5k $4.7m | New |
| GOLDMAN SACHS GROUP INC 0.00% of their portfolio | 371.5k $4.4m | Added +8.5k |
| Ancora Advisors LLC 0.08% of their portfolio | 370.7k $4.4m | Reduced -350.4k |
| VANGUARD PORTFOLIO MANAGEMENT LLC 0.00% of their portfolio | 360.7k $4.2m | Added +46.3k |
| Russell Investments Group, Ltd. 0.00% of their portfolio | 304.6k $3.6m | Reduced -202.8k |
| Loews Corp 0.03% of their portfolio | 300.0k $3.5m | Unchanged |
| BNP PARIBAS FINANCIAL MARKETS 0.00% of their portfolio | 292.5k $3.4m | Reduced -12.4k |
| NORTHERN TRUST CORP 0.00% of their portfolio | 283.7k $3.3m | Added +29.2k |
| CastleKnight Management LP 0.12% of their portfolio | 282.1k $3.3m | Added +98.6k |
| VANGUARD FIDUCIARY TRUST CO 0.00% of their portfolio | 225.4k $2.6m | Added +8.8k |
| GRATIA CAPITAL, LLC 3.04% of their portfolio | 224.9k $2.6m | Reduced -74.8k |
| Squarepoint Ops LLC 0.00% of their portfolio | 217.3k $2.6m | Added +39.4k |
| Man Group plc 0.00% of their portfolio | 207.2k $2.4m | Added +21.7k |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC 0.04% of their portfolio | 206.6k $2.4m | Added +7.7k |
| LSV ASSET MANAGEMENT 0.00% of their portfolio | 199.6k $2.3m | Reduced -44.9k |
| READYSTATE ASSET MANAGEMENT LP 0.09% of their portfolio | 192.5k $2.3m | Reduced -9.7k |
| PRIVATE MANAGEMENT GROUP INC 0.06% of their portfolio | 186.7k $2.2m | New |
| NORGES BANK 0.00% of their portfolio | 180.5k $2.1m | Not comparable |
| Trexquant Investment LP 0.01% of their portfolio | 175.2k $2.1m | Reduced -112.1k |
| STATE OF WISCONSIN INVESTMENT BOARD 0.00% of their portfolio | 164.9k $1.9m | Reduced -38.0k |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND 0.00% of their portfolio | 161.6k $1.9m | Added +115.0k |
| TUDOR INVESTMENT CORP ET AL 0.01% of their portfolio | 147.5k $1.7m | Reduced -121.8k |
| Empowered Funds, LLC 0.01% of their portfolio | 141.8k $1.7m | Added +7.7k |
| CITADEL ADVISORS LLC 0.00% of their portfolio | 135.3k $1.6m | Reduced -179.5k |
| Bank of New York Mellon Corp 0.00% of their portfolio | 127.7k $1.5m | Added +6.7k |
| Vanguard Global Advisers, LLC 0.00% of their portfolio | 110.4k $1.3m | Added +30.0k |
| XTX Topco Ltd 0.02% of their portfolio | 106.9k $1.3m | Added +3.9k |
| Alpine Global Management, LLC 0.19% of their portfolio | 100.0k $1.2m | Unchanged |
| Invesco Ltd. 0.00% of their portfolio | 99.7k $1.2m | Reduced -14.2k |
| Jump Financial, LLC 0.01% of their portfolio | 89.3k $1.0m | Reduced -83.9k |
| RAYMOND JAMES FINANCIAL INC 0.00% of their portfolio | 84.7k $995.3k | Added +5.7k |
| Balyasny Asset Management L.P. 0.00% of their portfolio | 81.3k $955.4k | New |
| Quinn Opportunity Partners LLC 0.04% of their portfolio | 75.6k $888.6k | Unchanged |
| FMR LLC 0.00% of their portfolio | 74.2k $872.4k | Added +7.4k |
| BANK OF AMERICA CORP /DE/ 0.00% of their portfolio | 72.3k $849.6k | Added +14.5k |
| Thrivent Financial for Lutherans 0.00% of their portfolio | 71.4k $840.0k | New |
| Susquehanna Portfolio Strategies, LLC 0.01% of their portfolio | 70.9k $833.1k | Reduced -18.3k |
| KNIGHTSBRIDGE ASSET MANAGEMENT, LLC 0.06% of their portfolio | 62.8k $863.9k | Added +26.3k |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO 0.00% of their portfolio | 57.3k $673.0k | Added +4.6k |
| Nuveen, LLC 0.00% of their portfolio | 55.8k $655.2k | Reduced -35.0k |
| Quantbot Technologies LP 0.03% of their portfolio | 54.0k $634.7k | Added +41.5k |
| Voleon Capital Management LP 0.01% of their portfolio | 50.1k $588.5k | Reduced -5.3k |
| Engineers Gate Manager LP 0.01% of their portfolio | 49.2k $578.6k | Reduced -72.2k |
| RBF Capital, LLC 0.02% of their portfolio | 45.5k $534.5k | Unchanged |
| RHUMBLINE ADVISERS 0.00% of their portfolio | 41.2k $483.9k | Added +155 |
| Tactive Advisors, LLC 0.12% of their portfolio | 40.0k $470.4k | Added +5.1k |
| ALLIANCEBERNSTEIN L.P. 0.00% of their portfolio | 39.1k $372.2k | Added +3.6k |
| PRICE T ROWE ASSOCIATES INC /MD/ 0.00% of their portfolio | 37.6k $442.0k | Added +1.6k |
| DEUTSCHE BANK AG\ 0.00% of their portfolio | 32.9k $387.1k | Added +21.6k |
| VOYA INVESTMENT MANAGEMENT LLC 0.00% of their portfolio | 32.7k $383.7k | Added +7.6k |
| CANADA PENSION PLAN INVESTMENT BOARD 0.00% of their portfolio | 31.6k $371.3k | Added +7.7k |
| Odyssean, LLC 0.06% of their portfolio | 30.2k $355.3k | New |
| WELLS FARGO & COMPANY/MN 0.00% of their portfolio | 29.9k $351.3k | Added +15.7k |
| Dynamic Technology Lab Private Ltd 0.08% of their portfolio | 28.9k $340.0k | New |
| CITIGROUP INC 0.00% of their portfolio | 26.2k $307.7k | Added +4.1k |
| Sterling Capital Management LLC 0.01% of their portfolio | 25.9k $304.6k | Reduced -395 |
| TWO SIGMA INVESTMENTS, LP 0.00% of their portfolio | 24.7k $290.7k | Added +1.3k |
| BROWN ADVISORY INC 0.00% of their portfolio | 22.1k $259.1k | Unchanged |
| Creative Planning 0.00% of their portfolio | 22.0k $258.6k | Added +7.4k |
| IEQ CAPITAL, LLC 0.00% of their portfolio | 21.6k $254.2k | New |
| Brevan Howard Capital Management LP 0.00% of their portfolio | 21.2k $249.3k | New |
| National Philanthropic Trust 0.00% of their portfolio | 20.8k $245.0k | Added +9.9k |
| PRELUDE CAPITAL MANAGEMENT, LLC 0.02% of their portfolio | 20.1k $236.5k | Added +825 |
| LPL Financial LLC 0.00% of their portfolio | 20.0k $235.1k | New |
| State of Wyoming 0.02% of their portfolio | 19.8k $233.2k | Added +4.7k |
| ARISTEIA CAPITAL, L.L.C. 0.00% of their portfolio | 19.0k $222.9k | New |
| Universal- Beteiligungs- und Servicegesellschaft mbH 0.00% of their portfolio | 18.6k $218.2k | Unchanged |
| MetLife Investment Management, LLC 0.00% of their portfolio | 17.9k $210.4k | Reduced -326 |
| HSBC HOLDINGS PLC 0.00% of their portfolio | 16.5k $190.1k | Added +840 |
| GLENMEDE TRUST CO NA 0.00% of their portfolio | 16.2k $190.7k | Unchanged |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC 0.00% of their portfolio | 15.8k $203.2k | New |