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MLM in the 13F filings

Martin Marietta Matls Inc · CUSIP 573284106

Sector · Materials
Quarter
Q3 2026 · early filersQ2 2026Q1 2026Q4 2025Q3 2025Q2 2025Q1 2025Q4 2024Q3 2024Q2 2024Q1 2024Q4 2023
Quarter end
30 Jun 2026
the date the book describes
Filed
27 Oct 2026
latest of these filings; the earliest 3 Aug 2026
Managers listing it
28
at least, of 95 tracked, among listed positions
Comparable managers
91
filed both Q1 2026 and Q2 2026; 9 listed it in both
Shares listed
7,750,843
combined, among listed positions
Reported value
$4.5bn
combined, at the quarter end

AllianceBernstein LP. Values in this filing are at the previous quarter end's prices; its share count is the quarter end's.

Among the 91 comparable managers: 18 buyers (opened or added shares) and 13 sellers (trimmed or exited), at least, among listed positions. Their net change in shares was +971,955.

Managers listing MLM in Q2 2026

Share of 13F value is the position’s reported value over everything the manager reported that quarter. The share change is against Q1 2026, and only where both filings list the position. A rise in value with no rise in shares is the price, not buying.

28 of 28 holders

ActionFiling
Fidelity (FMR LLC)2,192,603$1.3bn0.05%Trimmed-415,37613 Aug 2026 (the filing on sec.gov)
T. Rowe Price Associates Inc1,599,324$922m0.09%Added+110,48414 Aug 2026 (the filing on sec.gov)
TCI Fund Management Ltd1,315,109$758m1.44%Newnew14 Aug 2026 (the filing on sec.gov)
Baillie Gifford & Co991,786$572m0.52%Trimmed-95,5946 Aug 2026 (the filing on sec.gov)
Invesco Ltd649,575$375munder 0.1%Trimmed-41,33814 Aug 2026 (the filing on sec.gov)
D1 Capital Partners LP345,060$199m0.57%Added+22,20314 Aug 2026 (the filing on sec.gov)
Freestone Grove Partners LP124,262$72m0.46%Newnew14 Aug 2026 (the filing on sec.gov)
AQR Capital Management LLC67,001$39munder 0.1%Added+1,54114 Aug 2026 (the filing on sec.gov)
AllianceBernstein LP63,917$38munder 0.1%Trimmed-10,66814 Aug 2026 (the filing on sec.gov)
Janus Henderson Group Ltd56,106$32munder 0.1%Trimmed-6814 Aug 2026 (the filing on sec.gov)
Millennium Management LLC54,131$31munder 0.1%Added+39,27014 Aug 2026 (the filing on sec.gov)
Two Sigma Investments LP51,433$30munder 0.1%Trimmed-42,78014 Aug 2026 (the filing on sec.gov)
Neuberger Berman Group LLC47,643$27munder 0.1%Trimmed-6,50527 Oct 2026 (the filing on sec.gov)
Arrowstreet Capital LP46,785$27munder 0.1%Trimmed-44,73413 Aug 2026 (the filing on sec.gov)
Renaissance Technologies LLC31,894$18munder 0.1%Newnew13 Aug 2026 (the filing on sec.gov)
Citadel Advisors LLC25,897$15munder 0.1%Added+9,1672 Sep 2026 (the filing on sec.gov)
Susquehanna International Group LLP21,305$12munder 0.1%Added+13,05714 Aug 2026 (the filing on sec.gov)
ExodusPoint Capital Management LP17,535$10m0.07%Added+12,66414 Aug 2026 (the filing on sec.gov)
Artisan Partners LP16,004$9.2munder 0.1%Newnew13 Aug 2026 (the filing on sec.gov)
Woodline Partners LP13,117$7.6munder 0.1%Trimmed-57,82114 Aug 2026 (the filing on sec.gov)
Marshall Wace LLP4,521$2.6munder 0.1%Newnew13 Aug 2026 (the filing on sec.gov)
Jane Street Group LLC3,285$1.9munder 0.1%Added+31114 Aug 2026 (the filing on sec.gov)
Squarepoint Ops LLC2,857$1.6munder 0.1%Added+1,25414 Aug 2026 (the filing on sec.gov)
Tudor Investment Corp2,694$1.6munder 0.1%Added+4514 Aug 2026 (the filing on sec.gov)
MFS Investment Management2,062$1.2munder 0.1%Trimmed-363 Aug 2026 (the filing on sec.gov)
Page 1 of 2

Largest increases and reductions, by shares

Q1 2026 to Q2 2026, among managers that listed it in both quarters or opened it.

Increases

Reductions

New positions and exits

At least these many: a manager is shown exiting only where its own filing shows the position gone.

New (6)

Exited (3)

Ownership over time

Every quarter on file. A quarter-end value moves with the price as well as with the shares held; buyers and sellers count comparable managers, by shares.
10 in Q3 2024 to 9 in Q2 2026

Tracked managers listing it, at least.

051015202014201620182020202220242026
the quarter shown share split complete books; unmarked quarters rest on listed positionsClick a quarter to open it.
MLM by quarter
QuarterHoldersReported valueBuyersSellers
Q2 20139$969mn.a.n.a.
Q3 20135$984mn.a.n.a.
Q4 201310$1.2bnn.a.n.a.
Q1 20147$1.6bnn.a.n.a.
Q2 201412$1.9bnn.a.n.a.
Q3 201411$2.1bnn.a.n.a.
Q4 20146$1.8bnn.a.n.a.
Q1 201513$2.1bnn.a.n.a.
Q2 201510$2.0bnn.a.n.a.
Q3 201511$2.5bnn.a.n.a.
Q4 20159$2.2bnn.a.n.a.
Q1 201611$2.3bnn.a.n.a.
Q2 201612$2.6bnn.a.n.a.
Q3 201612$2.3bnn.a.n.a.
Q4 201615$3.0bnn.a.n.a.
Q1 201717$2.6bnn.a.n.a.
Q2 201716$2.7bnn.a.n.a.
Q3 20179$1.5bnn.a.n.a.
Q4 201714$1.7bnn.a.n.a.
Q1 20189$1.3bnn.a.n.a.
Q2 201811$1.9bnn.a.n.a.
Q3 20188$1.5bnn.a.n.a.
Q4 20188$1.4bnn.a.n.a.
Q1 201911$2.0bnn.a.n.a.
Q2 201911$2.1bnn.a.n.a.
Q3 201913$2.5bnn.a.n.a.
Q4 201915$2.2bnn.a.n.a.
Q1 202012$1.3bnn.a.n.a.
Q2 202010$1.2bnn.a.n.a.
Q3 20208$1.2bnn.a.n.a.
Q4 20207$1.2bnn.a.n.a.
Q1 202112$1.8bnn.a.n.a.
Q2 20217$2.1bnn.a.n.a.
Q3 20218$2.1bnn.a.n.a.
Q4 20218$3.3bnn.a.n.a.
Q1 202210$2.8bnn.a.n.a.
Q2 202211$2.0bnn.a.n.a.
Q3 202211$1.5bnn.a.n.a.
Q4 202211$1.7bnn.a.n.a.
Q1 202314$1.6bnn.a.n.a.
Q2 202315$2.3bnn.a.n.a.
Q3 202317$2.9bnn.a.n.a.
Q4 202316$3.4bn79
Q1 202415$4.3bn79
Q2 202411$4.0bn75
Q3 202410$3.8bn72
Q4 202410$3.4bn64
Q1 202511$2.7bn83
Q2 202513$3.0bn77
Q3 20258$3.2bn35
Q4 202510$3.6bn1611
Q1 20269$3.8bn1018
Q2 20269$4.2bn1813

Compare with…

Holders over time, buyers and sellers, and the managers holding both, side by side for up to four stocks.

MLM and LIN →MLM and GLW →MLM and HWM →Choose a stock to compare with MLM →

How much of the picture this is

A 13F is a manager’s long US-listed equity book at a quarter end, filed up to 45 days later. It shows no shorts, cash, bonds or performance, and it is never today’s portfolio. Large books are listed to their largest positions, so a manager missing from this table may still hold a small position below that line. These are 95 tracked managers, not the institutional market.

Which funds own MLM, latest filings →Back to the 13F Explorer →