MLM

Martin Marietta Materials Cross-source read$490.64 0.77%
MaterialsCUSIP 573284106· EOD Sep 18, 2026

Among active 13F managers last quarter, 4 opened and 22 added, while 27 reduced; the largest holder to move was Principal Financial Group Inc (−3.5%). No open-market insider trades in the last 180 days.

Tracked 13F holders
947
628 in Q2 2026 filings
13F value (tracked)
$32.7B
Smart-money readMixed
Net sellingNet buying
Funds · active managers, latest 13F
26 adding · 27 trimming
Insiders · Form 4 open-market, 180d
0 buying · 0 selling
US House · STOCK Act, 180d
1 buying · 2 selling · -$343K

The legs disagree, or only one of them leans.

Price & smart-money activity

$490.64 0.77%5Y +43.2%
$267.98$381.30$494.62$607.94$721.26202120222023202420252026848310589901099510691981099910610712310021359814111151491271431401641191941852031972181862362072632272392911711862
Hover for who · click for detailEnd-of-day closing prices52w $490.64 – $708.11

Who owns MLM?

947 tracked 13F filers · ranked by shares held

947 tracked 13F filers disclose a position in MLM as of the latest SEC 13F filings, a combined $32.7B in reported value. Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership.

#FundSharesPosition valueLast moveAs ofHistory
1BlackRock, Inc.4.7M
$2.7B
+0.1%
Added · +7K sh
Q2 2026
2Vanguard Capital Management LLC3.9M
$2.3B
+0.3%
Added · +12K sh
Q2 2026
3Vanguard Portfolio Management LLC3.2M
$1.8B
+1.2%
Added · +37K sh
Q2 2026
4State Street Corp3.2M
$1.8B
+9.8%
Added · +282K sh
Q2 2026
5Bank Of America Corp2.4M
$1.4B
+0.9%
Added · +21K sh
Q1 2026
6FMR LLC2.2M
$1.3B
−16%
Reduced · −415K sh
Q2 2026
7Principal Financial Group Inc2.1M
$1.2B
−3.5%
Reduced · −77K sh
Q1 2026
8JPMorgan Chase & Co1.9M
$1.1B
−17%
Reduced · −369K sh
Q1 2026
9Aristotle Capital Management, LLC1.8M
$1.1B
−6.3%
Reduced · −124K sh
Q2 2026
10Victory Capital Management Inc1.6M
$963.8M
−33%
Reduced · −812K sh
Q1 2026
11Geode Capital Management, LLC1.6M
$919.9M
+0.8%
Added · +13K sh
Q2 2026
12Price T Rowe Associates Inc1.6M
$922.3M
+7.4%
Added · +110K sh
Q2 2026
13Morgan Stanley1.3M
$789.8M
−1.9%
Reduced · −25K sh
Q1 2026
14TCI Fund Management Ltd1.3M
$758.4M
New
+1.3M sh
Q2 2026
15Baillie Gifford & Co1.1M
$640.1M
−6.2%
Reduced · −72K sh
Q1 2026
16Goldman Sachs Group Inc886K
$521.5M
+12%
Added · +96K sh
Q1 2026
17Gardner Russo & Quinn LLC705K
$406.8M
−1.4%
Reduced · −10K sh
Q2 2026
18King Luther Capital Management Corp667K
$392.5M
−3.4%
Reduced · −23K sh
Q1 2026
19T. Rowe Price Investment Management, Inc.641K
Withheld
−33%
Reduced · −311K sh
Q2 2026
20Alkeon Capital Management LLC627K
$361.8M
−16%
Reduced · −120K sh
Q2 2026
21Northern Trust Corp587K
$345.3M
−2.2%
Reduced · −13K sh
Q1 2026
22Norges Bank570K
$354.7M
+34%
Added · +144K sh
Q4 2025
23Dimensional Fund Advisors LP546K
$321.4M
+1.1%
Added · +6K sh
Q1 2026
24Franklin Templeton Inc528K
$310.9M
+6.0%
Added · +30K sh
Q1 2026
25CIBC Bancorp USA Inc.475K
$279.4M
14×
Added · +441K sh
Q1 2026

Holders and values reflect the 13F filers Arkolith currently tracks, not the entire institutional universe. Counts and totals are a floor, not the full institutional ownership. 4 value rows are withheld because the reported units disagree with same-security peers; share counts are unchanged.

Is MLM being bought or sold by institutions?

Last quarter, 4 funds opened a new position in MLM and 22 added to an existing one, while 27 reduced. Based on 13F filings from active, signal-eligible managers (passive index funds and other mechanical holders are excluded from this count).

Opened
4
funds took a first position
Added
22
added to an existing position
Reduced
27
reduced, still holding
Biggest moves · ranked by size of the change, positions above a floor

Funds that own MLM also own

CompanyCo-held byTheir position there
Microsoft CorpMSFT581 funds$329.9B
Amazon.com IncAMZN581 funds$261.0B
Nvidia CorpNVDA570 funds$494.8B
Apple IncAAPL565 funds$373.4B
Alphabet Inc-CL AGOOGL564 funds$233.9B
Meta Platforms Inc-Class AMETA554 funds$139.4B
JPMorgan Chase & CoJPM554 funds$85.5B
Alphabet Inc-CL CGOOG550 funds$162.0B
Eli Lilly & CoLLY545 funds$102.0B
Visa Inc-Class A SharesV545 funds$90.2B
Broadcom IncAVGO538 funds$197.1B
Walmart IncWMT538 funds$46.2B

Ranked by how many of MLM's tracked holders also hold each name. The last column is those co-holders' combined reported position in that name, not in MLM.

Insider activity (Form 4)

Full insider page →
Net · 180d
$0
0 open-market transactions
DateInsiderRoleActionSharesValue
Aug 8, 2025Perez Laree EDirectorSell (S)1K$637K
Mar 5, 2025McCunniff Donald A.EVP and CHROSell (S)1K$633K
Mar 4, 2025Petro Michael JSVP - Strategy and DevelopmentBuy (P)550$250K
Mar 14, 2024Bar Roselyn REVP, General Counsel and SecySell (S)10K$6.0M
Mar 5, 2024Nye C HowardChairman, Pres & CEO, DirectorSell (S)
2 lots, same day
20K$12.1M
Feb 16, 2024Cole Sue WDirectorSell (S)
2 lots, same day
2K$937K
Aug 21, 2023LaTorre Craig MSr. VP, CHROSell (S)2K$835K
Jul 28, 2023LaTorre Craig MSr. VP, CHROSell (S)500$224K
Nov 18, 2022Cole Sue WDirectorSell (S)2K$599K
Jun 10, 2022Mohr John PSVP - CIOSell (S)0$145
Mar 10, 2021Nye C HowardChairman, Pres & CEO, DirectorSell (S)
2 lots, same day
17K$5.7M
Mar 9, 2021Nye C HowardChairman, Pres & CEO, DirectorSell (S)3K$1.0M

One row per insider, day and transaction code; shares and value are summed across the lots. Every lot is on the full insider page and in the filing.

Do institutions, insiders and Congress agree?

Mixed signals

Where institutional funds (13F), corporate insiders (Form 4) and US House members (STOCK Act) are buying or selling the same name in the same window. Green is buying, red is selling.

SEC EDGAR 13F + Form 4 + US House STOCK Act{ }get_ticker_confluence · API & MCP

Signals by source

Insiders and Congress: last 180 days. Funds: latest 13F, top 100 holders incl. passive

SourceBuyingSellingNet
13F funds
Top 100 holders by value, passive included; the hero counts active managers only
4847
Insiders
Form 4 open-market
00$0
US House
STOCK Act trades
12-$343K
Sector rotation
MLM is in Materials, which smart money is rotating OUT OF
$5.3B

Capital Rotation reports where institutional capital disclosed rotating, as of the latest public SEC 13F filings. It is data, not investment advice, a recommendation, or a prediction. Filings lag about 45 days and cover long US equity positions only. Past disclosed flows do not indicate future prices. Do your own research; consult a licensed advisor.

Institutional ownership over time

628 tracked filers in Q2 2026 filingsstill filing
0471942Q3 2024Q1 2025Q3 2025Q1 2026Q2 2026
tracked filers holding their reported valueQ2 2026 filings so far: $6.3B · 4 values withheld
Each bar counts tracked filers with a position in that quarter's filings, so the newest bar excludes filers still on an earlier quarter. Arkolith's tracked universe has grown over this window; part of any long-run rise is coverage, not new buyers.

Recent filings

15 most recent

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Connected entities for MLM

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Ask your agent what changed in MLM

This stock page is the public Follow view. For one current, evidence-backed answer, use capital_change_brief through REST or MCP. It compares tracked 13F changes with qualifying Form 4 activity and cites the SEC evidence.

Copy-paste
curl -H "Authorization: Bearer YOUR_API_KEY" \
  "https://arkolith.com/api/v1/stocks/MLM/capital-change-brief"
Ask your agent
Use Arkolith's capital_change_brief for MLM.
Tell me what changed, whether insider activity
corroborates it, and cite the SEC evidence.

13F holdings + Form 4 insider transactions + end-of-day price history + the live filing stream, joined for MLM. Filings are public domain, sourced to SEC EDGAR; price series derived from end-of-day closes.