⌘K

MLM Institutional Ownership & 13F Holders | SmartMoneyDB

MLMMARTIN MARIETTA MATLS INC

COM · CUSIP 573284106

Smart Money Ownership

Of the 16 tracked institutions holding MLM, 10 have a 3-year clone track record — 8 of them beat the S&P. Average holder's clone alpha: +3.1pt. It's a gauge of who owns the name, not just how many.

MLM (MARTIN MARIETTA MATLS INC) Institutional Ownership Summary

Among the 16 tracked institutional investors we monitor, MLM (MARTIN MARIETTA MATLS INC) is held with a combined value of $12.38B across 20,610,275 shares. The largest holder is VANGUARD GROUP INC with a position worth $4.59B (0.07% of their portfolio). 3 funds opened new positions in the most recent quarter. 6 funds increased their holdings. 7 funds reduced their position.

Total Institutional Value

$12.38B

Total Shares Held

20,610,275

Institutional Holders

% of Shares Outstanding

34.3%

of 60.05M shares · SEC 2026-04-27

Days to Cover

3.0+3.2%

2.23M shares short · FINRA 2026-06-30

Tracked 13F institutions hold 34.3% of MLM's shares outstanding. This is a floor: 13F filings arrive on a ~45-day lag and we track only a subset of institutional filers, so true institutional ownership is higher. Shares-outstanding is the latest SEC cover-page figure (as of 2026-04-27), not a live float.

This Quarter's Biggest Movers

Ranked by estimated dollars moved (share change × implied price). 13F data lags up to 45 days.

Biggest Buyers

PRICE T ROWE ASSOCIATES INC /MD/+391% shares~$698.1M D1 Capital Partners L.P.New position~$190.1M BlackRock, Inc.+4% shares~$116.3M STATE STREET CORP+4% shares~$62.0M Stockbridge Partners LLCNew position~$19.0M

13F Institutional Holders

Sort

PRICE T ROWE ASSOCIATES INC /MD/

D1 Capital Partners L.P.

1.69% of bookNew

$190.06M

AQR CAPITAL MANAGEMENT LLC

0.02% of book-34.4%

$37.64M

Stockbridge Partners LLC

0.46% of bookNew

$18.96M

Gotham Asset Management, LLC

0.04% of book+47.6%

$12.93M

#	Fund	Value↓	Shares	Portfolio %	Change
1	VANGUARD GROUP INC	$4.59B	7,373,884	0.07%	-0.9%
2	BlackRock, Inc.	$2.76B	4,685,757	0.05%	+4.4%
3	STATE STREET CORP	$1.69B	2,877,568	0.06%	+3.8%
4	FMR LLC	$1.54B	2,607,979	0.08%	-10.7%
5	PRICE T ROWE ASSOCIATES INC /MD/	$876.45M	1,488,840	0.10%	+391.3%
6	BAILLIE GIFFORD & CO	$640.12M	1,087,380	0.65%	-6.2%
7	D1 Capital Partners L.P.	$190.06M	322,857	1.69%	New
8	AQR CAPITAL MANAGEMENT LLC	$37.64M	65,460	0.02%	-34.4%
9	Stockbridge Partners LLC	$18.96M	32,213	0.46%	New
10	Gotham Asset Management, LLC	$12.93M	21,970	0.04%	+47.6%

Congress Trading

4 members · 9 disclosed trades in MLM

Member	Type	Amount	Date
April McClain Delaney	Buy	$1,001 - $15,000	May 28, 2026
Josh Gottheimer	Sell	$15,001 - $50,000	Apr 9, 2026
April McClain Delaney	Buy	$1,001 - $15,000	Mar 9, 2026
April McClain Delaney	Buy	$1,001 - $15,000

Frequently Asked Questions

Which institutional investors own the most MLM stock?

As of the latest SEC 13F filings, VANGUARD GROUP INC is the largest institutional holder of MLM with a position worth $4.59B, representing 0.07% of their portfolio. In total, 16 institutional investors hold MLM with a combined value of $12.38B.

Are hedge funds buying or selling MLM?

In the most recent quarter, 3 funds opened a new position in MLM. Additionally, 6 increased their holdings and 7 reduced their positions.

What percentage of MLM is owned by institutional investors?

Institutional investors hold $12.38B worth of MLM stock across 16 positions. The largest institutional holder is VANGUARD GROUP INC with $4.59B in holdings.

What is a 13F filing and why does it matter for MLM?

A 13F filing is a quarterly report required by the SEC from institutional investment managers with over $100 million in assets. It discloses their holdings in U.S. equities. For MLM, these filings reveal which major funds are accumulating or reducing positions, providing insights into institutional sentiment.

Track MLM institutional moves

Get notified when hedge funds change their MLM positions.