Who owns Magnera (MAGN)
Which tracked institutional funds hold MAGN, how they are positioned, and who is buying versus exiting — from SEC Form 13F-HR filings. See MAGN company fundamentals →
Ownership as of the 2026-Q2 13F filings (latest filed 2026-09-22). 13F is disclosed up to 45 days after quarter-end, so the most recent quarter fills in over the following weeks.
How the tape is positioned
45 tracked funds added or opened MAGN while 18 trimmed or exited it between 2026-Q1 and 2026-Q2 — the tape is split. When large holders disagree on a name, the funds moving first are sometimes ahead of the story.
A prompt to read the filings, not a verdict. 13F is a quarter-end snapshot disclosed up to 45 days late; a fund adds or exits for mandate, benchmark, and timing reasons that have nothing to do with a view on the stock. This is a starting question, not a signal to trade.
Conviction spread
MAGN’s largest tracked holder by dollar value, Newtyn Management, LLC, sizes it at 4.1% of its own reported 13F book, while the median holder sizes it at 0.0% of theirs — a 4.1pp conviction gap — its largest holder concentrates the name more heavily than the typical one.
Book-share is each fund’s reported value in MAGN divided by its whole reported 13F book, so it is comparable across funds of different sizes and is unaffected by stock splits. A higher share means a fund has committed more of its book to the name — a starting question about conviction, not a verdict or a signal to trade.
Institutional & insider positioning
Between 2026-Q1 and 2026-Q2, across 172 tracked filers holding MAGN, 90 increased or opened the position and 75 reduced or closed it; over the same quarter, there were no open-market insider Form 4s.
This fuses two public signals for the same quarter — how tracked institutions changed their positions and whether insiders bought or sold in the open market. It describes what was filed; it is a starting question, not a verdict or a signal to trade.
New buyers & exits
Funds opening or closing a position in MAGN between the 2026-Q1 and 2026-Q2 13F filings, and the largest changes among funds holding it in both. New buyers and exits are counted on fund presence (split-invariant); adds and trims are measured on reported value.
New buyers 2
- PRIVATE MANAGEMENT GROUP INC$2M
- BALYASNY ASSET MANAGEMENT L.P.$955K
Full exits 8
- THOMPSON SIEGEL & WALMSLEY LLC$5M
- LSV ASSET MANAGEMENT$2M
- MILLENNIUM MANAGEMENT LLC$2M
- Weiss Asset Management LP$1M
- ING GROEP NV$1M
- Y-Intercept (Hong Kong) Ltd$747K
Largest adds
- BlackRock, Inc.$8M
- Newtyn Management, LLC$7M
- Engine Capital Management, LP$5M
- AMERICAN CENTURY COMPANIES INC$5M
- DIMENSIONAL FUND ADVISORS LP$4M
- AQR CAPITAL MANAGEMENT LLC$4M
Largest trims
- Ancora Advisors LLC$3M
- CITADEL ADVISORS LLC$1M
- Russell Investments Group, Ltd.$1M
- LITTLEJOHN & CO LLC$873K
- TUDOR INVESTMENT CORP ET AL$828K
- MORGAN STANLEY$687K
Institutional holders
One row per tracked fund, most shares held first (every row is from one quarter; reported value breaks ties). “% of value” is the fund’s share of this security’s tracked institutional value — not of shares outstanding.
| Fund | Shares | Reported value | % of value | Quarter |
|---|---|---|---|---|
| Newtyn Management, LLC added | 2,800,000 | $33M | 8.0% | 2026-Q2 |
| BlackRock, Inc. added | 2,596,578 | $31M | 7.4% | 2026-Q2 |
| Engine Capital Management, LP | 2,243,827 | $26M | 6.4% | 2026-Q2 |
| LITTLEJOHN & CO LLC trimmed | 1,889,088 | $22M | 5.4% | 2026-Q2 |
| VANGUARD CAPITAL MANAGEMENT LLC added | 1,563,111 | $18M | 4.5% | 2026-Q2 |
| MORGAN STANLEY trimmed | 1,534,193 | $18M | 4.4% | 2026-Q2 |
| Madison Avenue Partners, LP trimmed | 1,302,066 | $15M | 3.7% | 2026-Q2 |
| Diameter Capital Partners LP | 1,205,793 | $14M | 3.5% | 2026-Q2 |
| DG Capital Management, LLC trimmed | 1,101,476 | $13M | 3.2% | 2026-Q2 |
| GEODE CAPITAL MANAGEMENT, LLC added | 862,384 | $10M | 2.5% | 2026-Q2 |
| CANYON CAPITAL ADVISORS LLC | 810,000 | $10M | 2.3% | 2026-Q2 |
| D. E. Shaw & Co., Inc. trimmed | 789,745 | $9M | 2.3% | 2026-Q2 |
| Clearline Capital LP added | 741,096 | $9M | 2.1% | 2026-Q2 |
| STATE STREET CORP added | 671,927 | $8M | 1.9% | 2026-Q2 |
| JB CAPITAL PARTNERS LP | 655,000 | $8M | 1.9% | 2026-Q2 |
| JPMORGAN CHASE & CO trimmed | 610,865 | $7M | 1.8% | 2026-Q2 |
| Verition Fund Management LLC added | 607,303 | $7M | 1.7% | 2026-Q2 |
| JACOBS LEVY EQUITY MANAGEMENT, INC added | 601,599 | $7M | 1.7% | 2026-Q2 |
| AMERICAN CENTURY COMPANIES INC added | 599,991 | $7M | 1.7% | 2026-Q2 |
| AMERIPRISE FINANCIAL INC added | 578,498 | $7M | 1.7% | 2026-Q2 |
| DIMENSIONAL FUND ADVISORS LP added | 571,344 | $7M | 1.6% | 2026-Q2 |
| Assenagon Asset Management S.A. trimmed | 558,957 | $7M | 1.6% | 2026-Q2 |
| UBS Group AG added | 506,934 | $6M | 1.5% | 2026-Q2 |
| AQR CAPITAL MANAGEMENT LLC added | 479,549 | $6M | 1.4% | 2026-Q2 |
| ALGERT GLOBAL LLC added | 447,367 | $5M | 1.3% | 2026-Q2 |
| J. Goldman & Co LP added | 424,989 | $5M | 1.2% | 2026-Q2 |
| CHARLES SCHWAB INVESTMENT MANAGEMENT INC trimmed | 423,311 | $5M | 1.2% | 2026-Q2 |
| Seven Six Capital Management, LLC added | 398,568 | $5M | 1.1% | 2026-Q2 |
| GOLDMAN SACHS GROUP INC added | 371,488 | $4M | 1.1% | 2026-Q2 |
| Ancora Advisors LLC trimmed | 370,701 | $4M | 1.1% | 2026-Q2 |
| VANGUARD PORTFOLIO MANAGEMENT LLC added | 360,698 | $4M | 1.0% | 2026-Q2 |
| Russell Investments Group, Ltd. trimmed | 304,607 | $4M | 0.9% | 2026-Q2 |
| Loews Corp | 300,000 | $4M | 0.9% | 2026-Q2 |
| BNP PARIBAS FINANCIAL MARKETS trimmed | 292,549 | $3M | 0.8% | 2026-Q2 |
| NORTHERN TRUST CORP added | 283,739 | $3M | 0.8% | 2026-Q2 |
| CastleKnight Management LP added | 282,095 | $3M | 0.8% | 2026-Q2 |
| VANGUARD FIDUCIARY TRUST CO added | 225,355 | $3M | 0.6% | 2026-Q2 |
| GRATIA CAPITAL, LLC trimmed | 224,872 | $3M | 0.6% | 2026-Q2 |
| Squarepoint Ops LLC added | 217,272 | $3M | 0.6% | 2026-Q2 |
| Man Group plc added | 207,170 | $2M | 0.6% | 2026-Q2 |
| BRIDGEWAY CAPITAL MANAGEMENT, LLC added | 206,604 | $2M | 0.6% | 2026-Q2 |
| READYSTATE ASSET MANAGEMENT LP trimmed | 192,534 | $2M | 0.6% | 2026-Q2 |
| PRIVATE MANAGEMENT GROUP INC new | 186,728 | $2M | 0.5% | 2026-Q2 |
| NORGES BANK added | 180,500 | $2M | 0.5% | 2026-Q2 |
| Trexquant Investment LP trimmed | 175,176 | $2M | 0.5% | 2026-Q2 |
| STATE OF WISCONSIN INVESTMENT BOARD trimmed | 164,888 | $2M | 0.5% | 2026-Q2 |
| HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND added | 161,600 | $2M | 0.5% | 2026-Q2 |
| TUDOR INVESTMENT CORP ET AL trimmed | 147,495 | $2M | 0.4% | 2026-Q2 |
| Empowered Funds, LLC added | 141,758 | $2M | 0.4% | 2026-Q2 |
| CITADEL ADVISORS LLC trimmed | 135,285 | $2M | 0.4% | 2026-Q2 |
| Bank of New York Mellon Corp added | 127,705 | $2M | 0.4% | 2026-Q2 |
| Vanguard Global Advisers, LLC added | 110,369 | $1M | 0.3% | 2026-Q2 |
| XTX Topco Ltd added | 106,905 | $1M | 0.3% | 2026-Q2 |
| Alpine Global Management, LLC | 100,000 | $1M | 0.3% | 2026-Q2 |
| Invesco Ltd. trimmed | 99,714 | $1M | 0.3% | 2026-Q2 |
| Jump Financial, LLC trimmed | 89,338 | $1M | 0.3% | 2026-Q2 |
| RAYMOND JAMES FINANCIAL INC added | 84,703 | $995K | 0.2% | 2026-Q2 |
| BALYASNY ASSET MANAGEMENT L.P. new | 81,310 | $955K | 0.2% | 2026-Q2 |
| Quinn Opportunity Partners LLC | 75,624 | $889K | 0.2% | 2026-Q2 |
| FMR LLC added | 74,250 | $872K | 0.2% | 2026-Q2 |
| BANK OF AMERICA CORP /DE/ added | 72,305 | $850K | 0.2% | 2026-Q2 |
| Susquehanna Portfolio Strategies, LLC trimmed | 70,902 | $833K | 0.2% | 2026-Q2 |
| PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO added | 57,275 | $673K | 0.2% | 2026-Q2 |
| Nuveen, LLC trimmed | 55,759 | $655K | 0.2% | 2026-Q2 |
| Quantbot Technologies LP added | 54,017 | $635K | 0.2% | 2026-Q2 |
| Voleon Capital Management LP trimmed | 50,087 | $589K | 0.1% | 2026-Q2 |
| Engineers Gate Manager LP trimmed | 49,240 | $579K | 0.1% | 2026-Q2 |
| RBF Capital, LLC | 45,492 | $535K | 0.1% | 2026-Q2 |
| RHUMBLINE ADVISERS added | 41,185 | $484K | 0.1% | 2026-Q2 |
| Tactive Advisors, LLC added | 40,035 | $470K | 0.1% | 2026-Q2 |
| ALLIANCEBERNSTEIN L.P. added | 39,134 | $372K | 0.1% | 2026-Q2 |
| PRICE T ROWE ASSOCIATES INC /MD/ added | 37,610 | $442K | 0.1% | 2026-Q2 |
| DEUTSCHE BANK AG\ added | 32,944 | $387K | 0.1% | 2026-Q2 |
| VOYA INVESTMENT MANAGEMENT LLC added | 32,656 | $384K | 0.1% | 2026-Q2 |
| CANADA PENSION PLAN INVESTMENT BOARD added | 31,600 | $371K | 0.1% | 2026-Q2 |
| Odyssean, LLC new | 30,236 | $355K | 0.1% | 2026-Q2 |
| WELLS FARGO & COMPANY/MN added | 29,895 | $351K | 0.1% | 2026-Q2 |
| Dynamic Technology Lab Private Ltd added | 28,942 | $340K | 0.1% | 2026-Q2 |
| CITIGROUP INC added | 26,185 | $308K | 0.1% | 2026-Q2 |
| Sterling Capital Management LLC trimmed | 25,920 | $305K | 0.1% | 2026-Q2 |
| KNIGHTSBRIDGE ASSET MANAGEMENT, LLC trimmed | 25,478 | $299K | 0.1% | 2026-Q2 |
| TWO SIGMA INVESTMENTS, LP added | 24,741 | $291K | 0.1% | 2026-Q2 |
| BROWN ADVISORY INC | 22,054 | $259K | 0.1% | 2026-Q2 |
| Creative Planning added | 22,012 | $259K | 0.1% | 2026-Q2 |
| IEQ CAPITAL, LLC new | 21,633 | $254K | 0.1% | 2026-Q2 |
| Brevan Howard Capital Management LP added | 21,216 | $249K | 0.1% | 2026-Q2 |
| National Philanthropic Trust added | 20,848 | $245K | 0.1% | 2026-Q2 |
| PRELUDE CAPITAL MANAGEMENT, LLC added | 20,124 | $236K | 0.1% | 2026-Q2 |
| LPL Financial LLC new | 20,009 | $235K | 0.1% | 2026-Q2 |
| State of Wyoming added | 19,844 | $233K | 0.1% | 2026-Q2 |
| ARISTEIA CAPITAL, L.L.C. trimmed | 18,966 | $223K | 0.1% | 2026-Q2 |
| Universal- Beteiligungs- und Servicegesellschaft mbH | 18,567 | $218K | 0.1% | 2026-Q2 |
| MetLife Investment Management, LLC trimmed | 17,904 | $210K | 0.1% | 2026-Q2 |
| HSBC HOLDINGS PLC added | 16,527 | $190K | 0.0% | 2026-Q2 |
| GLENMEDE TRUST CO NA | 16,230 | $191K | 0.0% | 2026-Q2 |
| WEALTH ENHANCEMENT ADVISORY SERVICES, LLC new | 15,752 | $203K | 0.0% | 2026-Q2 |
| EP Wealth Advisors, LLC new | 15,658 | $184K | 0.0% | 2026-Q2 |
| Cetera Investment Advisers new | 15,609 | $183K | 0.0% | 2026-Q2 |
| MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. added | 15,548 | $183K | 0.0% | 2026-Q2 |
| Mariner, LLC new | 15,281 | $180K | 0.0% | 2026-Q2 |
Ownership over time
Tracked institutional holder count and total shares held by filing quarter (independent scales). The curated-era tail and any mid-ingest latest quarter are handled honestly — a partial quarter is not drawn as a collapse.
Reading this table
Funds hold the same stock for different reasons — an index fund “holds” almost everything, an active manager sizes a name to a mandate and a benchmark, and each fund entered at its own price and time. Because 13F is filed up to 45 days after quarter-end, every row is a backward-looking snapshot; a manager may have traded since. Share-class siblings (a company’s A and C shares) are rolled up to one line so a dual-class name is never double-counted. Compare like-for-like. A large holder is not an endorsement, and a fund exiting is not a warning — this is a starting question, not a verdict.
About 13F filings
A Form 13F is a quarterly disclosure that institutional investment managers with over $100 million in US-listed equities must file with the SEC. In plain English: it is a snapshot of the long stock positions a fund held at the end of a quarter. It covers long US-listed equities only — not short positions, options, cash, or private holdings — and the funds shown are the large sample we track, not the complete 13F universe.