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MAGN · Magnera Corp · Holdings

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$11.82 -0.02 (-0.17%)
Russell 2000 member Rebalance outlook locked
Market Cap
$423.87M
Shares
35.80M
Volume · Oct 23 150.79K Avg daily vol (3M) 417.46K

Institutional ownership from SEC Form 13F filings. Investment managers with more than $100 million in U.S. equities must disclose their positions every quarter, within 45 days of quarter-end, so the holdings shown can lag the market by up to a quarter.

Use institutional holdings through the 13F API or MCP → See every holder of MAGN: 13F, 13D and 13G, insiders and funds →
The Sep 30, 2026 filing window is still open — showing the latest known positions. Funds that have not filed yet carry their prior-quarter positions; a fund that filed without this stock counts as sold out. Each fund's Change is measured against its own previous reported quarter, shown in the Reported column. Pick a completed quarter in the Quarter selector below to put every fund on one quarter and see the stock-wide activity breakdown.
Holders: 181
Total Value: $426,377,266
Total Shares: 36,308,328
Showing 1–100 of 181 holdings by value · page 1 of 2

Institutional Ownership Trend

23 quarters

Holder Concentration

Across 181 13F filers
Top Holder
7.7%
Sep 2022 → Jun 2026 · range 6.9% – 100.0%
of institutional value
Top 5
30.5%
Sep 2022 → Jun 2026 · range 30.5% – 100.0%
of institutional value
Top 10
47.0%
Sep 2022 → Jun 2026 · range 47.0% – 100.0%
of institutional value
HHI
314
Sep 2022 → Jun 2026 · range 314 – 10,000
Broadly held

Who Holds MAGN

Last 8 quarters through Sep 30, 2026 (filing window open)

Each kind of 13F filer's share of the common shares 13F filers report. Holder type comes from regulatory records, never the filer's name; style, turnover and horizon are measured from each filer's own 13F book. The quarter selector does not change this card.

Jun 30, 2026, the newest closed quarter: 178 filers, like-for-like change -1.1%; actively managed books -1.1%; index-like books -1.0%.

Holder type Share Filers Change
Registered adviser 60.4% 94 -1.3%
Exempt adviser 0.7% 2 -43.2%
Adviser 1.9% 3 +6.0%
Bank 6.4% 15 -1.3%
Insurer 0.8% 1 0.0%
Broker-dealer 0.1% 2 new
Benefit plan 0.6% 3 -13.7%
Non-US 3.0% 7 +136.9%
Holding company 12.6% 6 -4.4%
Unknown 13.5% 45 -4.5%

The Sep 30, 2026 filing window is still open, so its bar carries the Jun 30, 2026 positions of filers that have not filed yet.

How the mix is measured

Shares are 13F common shares restated to today's split basis; options and principal amounts are left out. The change compares only filers with a 13F in both quarters and keeps each filer in its bucket of the later quarter on both sides; a filer that continues under a new CIK is compared through its successor. Holder type comes from each filer's current regulatory profile; client base and private funds come from the Form ADV roster current at each quarter end (rosters from December 2019, so an earlier quarter reads Unknown). Style, turnover, horizon and book size are measured from each filer's 13F book in the newest measured quarter, and Not measured means none was. Actively managed books are those measured systematic-like, concentrated or diversified active.

Excluded 2 holders with no observed 2026-03-31 13F and 3 holders with no observed 2026-06-30 13F.

Conviction and Crowding

178 13F filers, quarter ended Jun 30, 2026

Measured across every 13F filer's common-share book once the quarter's filing window closed. Crowding counts filers with high turnover or that advise private funds on Form ADV.

Conviction holders
3
1.69% of filers hold it in their top 10
Mar 31, 2026: 2
Holders above 5%
1
median weight 0.000%
Mar 31, 2026: 2
Crowding
—
holders exceed shares outstanding: 13F filers report more shares than the cover-page count, which predates an issuance, is misstated, or misses shares lent and reported twice
Private-fund advisers
—
of shares outstanding
Institutional ownership
—
holders exceed shares outstanding: 13F filers report more shares than the cover-page count, which predates an issuance, is misstated, or misses shares lent and reported twice
Top 10 holders
47.0%
of 13F shares, Herfindahl 0.031
Active holders
-1.1%
like-for-like share change of active filers
5% stakes on record
4
1 13D, 3 13G (2 institutional, 1 passive, 0 exempt)
How long holders have held it value-weighted 5.7 quarters
Under 1 year 20.1% 1 to 3 years 79.9% 3 years or more 0.000% Since coverage start 0.000%

Managers in the top fifth by current three-year FundScore alpha were net buyers of $0 (0 buying, 0 selling).

Estimated Holder Cost Basis

Quarter ended Jun 30, 2026, on that quarter's share basis

Estimated, never filed: each 13F buy is costed at its quarter's average traded price and each sale keeps the average cost, so this is what holders paid on average if they traded evenly through each quarter.

Estimated avg cost
$12.02
estimated per share
Mar 31, 2026: $12.42
Quarter-end price
$11.75
implied by 13F values
Estimated gain or loss
-2.3%
price against the estimated cost
Estimated at a loss
60.1%
of costed 13F value

Estimated cost covers 26.7% of the 13F shares; positions already held when a filer's 13F history starts, or bought in a quarter without a trusted average price, have no estimate.

Shared Holders

Companies MAGN's active holders also own, quarter ended Jun 30, 2026
# Company Shared holders
1 AIV Apartment Investment & Management Co 3
2 CBZ CBIZ, Inc. 3
3 AVTR Avantor, Inc. 3
4 JHX James Hardie Industries plc 3
5 AMCR Amcor plc 4
6 PRIM Primoris Services Corp 3
7 BLDR Builders FirstSource, Inc. 3
8 ECHO EchoStar CORP 3
9 MU Micron Technology Inc 3
10 AMD Advanced Micro Devices Inc 3

Shareholder Targets

13F filers that own its peers but not MAGN, quarter ended Jun 30, 2026

Found through its holder-overlap peers: AIV, CBZ, AVTR, JHX, AMCR, PRIM, BLDR, ECHO, MU, AMD, AVGO, META, NVDA. 6,548 filers in all.

# Filer In peers
1 Capital World Investors Adviser, Diversified active $125,917,937,292 8 held
2 Capital Research Global Investors Adviser, Diversified active $110,812,893,640 7 held
3 Capital International Investors Adviser, Diversified active $72,727,363,381 6 held
4 WELLINGTON MANAGEMENT GROUP LLP Holding company, Diversified active $62,153,542,152 10 held
5 Amundi Holding company, Index-like $54,090,680,316 11 held
6 FRANKLIN RESOURCES INC Adviser, Diversified active $42,428,076,599 12 held
7 VAN ECK ASSOCIATES CORP Registered adviser, Index-like $32,423,469,947 8 held
8 Jupiter Topco LLC Unknown, Diversified active $32,350,801,180 12 held
9 JENNISON ASSOCIATES LLC Registered adviser, Diversified active $31,516,978,278 7 held
10 Fisher Asset Management, LLC Adviser, Diversified active $28,109,745,530 5 held

Fund Ownership of MAGN by Fund Type

Registered funds' Form N-PORT reports for the quarter ended Jun 30, 2026

Index funds and index ETFs hold 13.02% of shares outstanding.

Fund type Of shares outstanding Shares
Index funds 3.33% 1,190,475
Index ETFs 9.70% 3,471,554
Active ETFs 1.37% 489,717
Active funds 4.57% 1,636,404
Unclassified 1.79% 642,472
All registered funds 20.76% 7,430,622
How fund types are measured

Each fund series counts once, with its latest Form N-PORT report dated inside the quarter; only long share positions count, restated to today's split basis. The fund type is the series' latest Form N-CEN answer on or before the quarter end (the index-fund box and the exchange-traded flag), never its name. Unclassified funds have no usable N-CEN; unit investment trusts are among them, so index ownership is a floor. Funds sit inside their advisers' 13F reports, so these shares overlap the 13F figures and are never added to them.

Holder type: Registered adviser 93 Exempt adviser 3 Adviser 3 Bank 15 Insurer 1 Broker-dealer 2 Benefit plan 3 Non-US 8 Holding company 6 Unknown 47
Showing 100 of 181
All Common Calls Puts
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Holder Value (USD) % of 13F Shares Open
Newtyn Management, LLC $32,900,000 7.72% 2,800,000
BlackRock, Inc. $30,509,789 7.16% 2,596,578
Engine Capital Management, LP $26,364,967 6.18% 2,243,827
LITTLEJOHN & CO LLC $22,196,784 5.21% 1,889,088
VANGUARD CAPITAL MANAGEMENT LLC $18,366,554 4.31% 1,563,111
MORGAN STANLEY $18,026,764 4.23% 1,534,193
Madison Avenue Partners, LP $15,299,275 3.59% 1,302,066
Diameter Capital Partners LP $14,168,067 3.32% 1,205,793
DG Capital Management, LLC $12,942,343 3.04% 1,101,476
GEODE CAPITAL MANAGEMENT, LLC $10,133,011 2.38% 862,384
CANYON CAPITAL ADVISORS LLC $9,517,500 2.23% 810,000
D. E. Shaw & Co., Inc. $9,279,503 2.18% 789,745
Clearline Capital LP $8,707,878 2.04% 741,096
STATE STREET CORP $7,895,142 1.85% 671,927
JB CAPITAL PARTNERS LP $7,696,250 1.81% 655,000
THOMPSON SIEGEL & WALMSLEY LLC $7,635,220 1.79% 649,806
JPMORGAN CHASE & CO $7,177,661 1.68% 610,865
Verition Fund Management LLC $7,135,810 1.67% 607,303
JACOBS LEVY EQUITY MANAGEMENT, INC $7,068,788 1.66% 601,599
AMERICAN CENTURY COMPANIES INC $7,049,894 1.65% 599,991
AMERIPRISE FINANCIAL INC $6,797,351 1.59% 578,498
DIMENSIONAL FUND ADVISORS LP $6,713,291 1.57% 571,344
UBS Group AG $5,956,474 1.40% 506,934
AQR CAPITAL MANAGEMENT LLC $5,634,699 1.32% 479,549
ALGERT GLOBAL LLC $5,256,562 1.23% 447,367
J. Goldman & Co LP $4,993,620 1.17% 424,989
CHARLES SCHWAB INVESTMENT MANAGEMENT INC $4,973,904 1.17% 423,311
Seven Six Capital Management, LLC $4,683,174 1.10% 398,568
Assenagon Asset Management S.A. $4,678,781 1.10% 412,591
SG Americas Securities, LLC $4,670,895 1.10% 397,523
GOLDMAN SACHS GROUP INC $4,364,983 1.02% 371,488
Ancora Advisors LLC $4,355,735 1.02% 370,701
VANGUARD PORTFOLIO MANAGEMENT LLC $4,238,201 0.99% 360,698
Russell Investments Group, Ltd. $3,579,129 0.84% 304,607
Loews Corp $3,525,000 0.83% 300,000
BNP PARIBAS ARBITRAGE, SA $3,437,450 0.81% 292,549
NORTHERN TRUST CORP $3,333,932 0.78% 283,739
CastleKnight Management LP $3,314,616 0.78% 282,095
VANGUARD FIDUCIARY TRUST CO $2,647,921 0.62% 225,355
GRATIA CAPITAL, LLC $2,642,246 0.62% 224,872
Squarepoint Ops LLC $2,552,946 0.60% 217,272
Man Group plc $2,434,247 0.57% 207,170
BRIDGEWAY CAPITAL MANAGEMENT, LLC $2,427,597 0.57% 206,604
LSV ASSET MANAGEMENT $2,345,570 0.55% 199,623
READYSTATE ASSET MANAGEMENT LP $2,262,274 0.53% 192,534
PRIVATE MANAGEMENT GROUP INC $2,194,054 0.51% 186,728
NORGES BANK $2,120,875 0.50% 180,500
Trexquant Investment LP $2,058,318 0.48% 175,176
STATE OF WISCONSIN INVESTMENT BOARD $1,937,434 0.45% 164,888
HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND $1,898,800 0.45% 161,600
TUDOR INVESTMENT CORP ET AL $1,733,066 0.41% 147,495
Empowered Funds, LLC $1,665,656 0.39% 141,758
CITADEL ADVISORS LLC $1,589,598 0.37% 135,285
Bank of New York Mellon Corp $1,500,532 0.35% 127,705
Vanguard Global Advisers, LLC $1,296,835 0.30% 110,369
XTX Topco Ltd $1,256,133 0.29% 106,905
Alpine Global Management, LLC $1,175,000 0.28% 100,000
Invesco Ltd. $1,171,638 0.27% 99,714
Jump Financial, LLC $1,049,721 0.25% 89,338
RAYMOND JAMES FINANCIAL INC $995,259 0.23% 84,703
Balyasny Asset Management L.P. $955,392 0.22% 81,310
Quinn Opportunity Partners LLC $888,582 0.21% 75,624
FMR LLC $872,437 0.20% 74,250
BANK OF AMERICA CORP /DE/ $849,583 0.20% 72,305
Thrivent Financial for Lutherans $839,525 0.20% 71,449
Susquehanna Portfolio Strategies, LLC $833,098 0.20% 70,902
SummerHaven Investment Management, LLC $803,926 0.19% 70,893
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO $672,981 0.16% 57,275
Nuveen, LLC $655,168 0.15% 55,759
Quantbot Technologies LP $634,699 0.15% 54,017
Voleon Capital Management LP $588,522 0.14% 50,087
Engineers Gate Manager LP $578,570 0.14% 49,240
RBF Capital, LLC $534,531 0.13% 45,492
RHUMBLINE ADVISERS $483,923 0.11% 41,185
ALLIANCEBERNSTEIN L.P. $459,824 0.11% 39,134
Y-Intercept (Hong Kong) Ltd $453,554 0.11% 39,996
PRICE T ROWE ASSOCIATES INC /MD/ $441,917 0.10% 37,610
Tactive Advisors, LLC $415,871 0.10% 36,673
DEUTSCHE BANK AG\ $387,092 0.09% 32,944
VOYA INVESTMENT MANAGEMENT LLC $383,708 0.09% 32,656
CANADA PENSION PLAN INVESTMENT BOARD $371,300 0.09% 31,600
Odyssean, LLC $355,273 0.08% 30,236
WELLS FARGO & COMPANY/MN $351,266 0.08% 29,895
Dynamic Technology Lab Private Ltd $340,068 0.08% 28,942
CITIGROUP INC $307,673 0.07% 26,185
KNIGHTSBRIDGE ASSET MANAGEMENT, LLC $299,366 0.07% 25,478
TWO SIGMA INVESTMENTS, LP $290,706 0.07% 24,741
BROWN ADVISORY INC $259,134 0.06% 22,054
Creative Planning $258,641 0.06% 22,012
IEQ CAPITAL, LLC $254,187 0.06% 21,633
Brevan Howard Capital Management LP $249,288 0.06% 21,216
National Philanthropic Trust $244,964 0.06% 20,848
PRELUDE CAPITAL MANAGEMENT, LLC $236,457 0.06% 20,124
LPL Financial LLC $235,105 0.06% 20,009
State of Wyoming $233,167 0.05% 19,844
ARISTEIA CAPITAL, L.L.C. $222,850 0.05% 18,966
Universal- Beteiligungs- und Servicegesellschaft mbH $218,162 0.05% 18,567
MetLife Investment Management, LLC $210,372 0.05% 17,904
HSBC HOLDINGS PLC $194,192 0.05% 16,527
WEALTH ENHANCEMENT ADVISORY SERVICES, LLC $192,122 0.05% 16,942

Showing the top 100 of 181 holders. Create a free account to see every holder, past quarters, search, filters and CSV export.

Key facts CIK 41719 CUSIP 55939A107 13F (30d) 20 filings 20 filers Visit website Investor relations