Insider trading data is absent; based solely on institutional 13F filings, net value declined $2.71B, net sellers outnumber buyers 502 to 458, exits (128) exceed new buys (86), a clear distribution pattern.

Confirmation

Continued reduction in institutional holdings in the next quarterly filing would further confirm the bearish outlook.

Invalidation Risk

A sudden surge in insider accumulation would invalidate this verdict and require reassessment.

Generated by AI using publicly filed institutional data, reflecting past activity only. Not investment advice — do not base trading decisions on this alone.

Insider Trading (Form 4)

12-Month Buy/Sell Activity

Mar 25

BuySell

Action	Insider	Title	Date	Value
Sell	PEREZ LAREE E	Director	2025-08-08	$637K
Sell	McCunniff Donald A.	EVP and CHRO	2025-03-05	$633K
Buy	Petro Michael J	SVP and CFO	2025-03-04	$250K

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Form 144 Pre-Sale Notices

No Form 144 planned sale filings in the last 90 days

Beneficial Ownership (13D/13G)

No Schedule 13D/13G filings for this ticker

Material Events (8-K)

Filings (14d)

Data as of 2026-07-15

2026-07-15

On July 10, Martin Marietta Materials (MLM) amended its existing $800 million revolving credit facility, and on July 15 it entered into a new $1.5 billion three-year term loan facility, both to fund its acquisition of Lhoist North America. Both agreements set a maximum leverage ratio that starts at 4.75x for the first three quarters after closing, then steps down to 4.25x and eventually 3.75x.

View Full Filing (SEC EDGAR)

View all Form 8-K filings

FAQ

Who are the top institutional investors holding MARTIN MARIETTA MATERIALS (MLM)?

Major stakeholders currently include BlackRock, Inc. ($2.8B), Vanguard Capital Management LLC ($2.3B), Vanguard Portfolio Management LLC ($1.9B). Based on the latest 13F filings, there are a total of 1069 tracked investment funds and institutions maintaining positions in MLM.

What is the overall institutional sentiment toward MLM recently?

Institutional sentiment appears Bearish (Net Selling). During the most recent reporting quarter, the stock experienced a net outflow of $2.7B, driven by 458 managers accumulating shares while 502 reduced their exposure.

Which institutions have been selling or reducing their MLM positions?

In the latest period, 374 funds trimmed their holdings, and 128 managers completely exited their positions. The aggregate reported sell value was $18.1B.

Are there any notable investors adding MLM to their portfolios?

Yes, buying activity remains notable. 86 institutions opened new positions in {ticker}, and 372 existing holders added to their shares. The total reported buy value for the quarter amounted to $15.1B.