2026-09-16
AI summary pending
View Full Filing (SEC EDGAR)Martin Marietta Materials
$485.50+0.7%
+$16.4B
Net Activity
+89.51% total shares
Institutions Holding
1078
Popularity Rank
#428
Avg Weight
0.23%
Total Value
$34.6B
Market Cap
$29.4B
1078 institutions currently hold MLM, with 474 net buyers and 504 net sellers this quarter.
Institutional Moves (Q2 2026)
Neutral
Based on recent trading activity
Net Selling Institutions
504
Net Buying Institutions
474
Top 5 by Value
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Across its top 20 institutional holders, MLM's holder base skews toward low-concentration, low-turnover investors on average (avg. concentration score 10/100, avg. turnover score 29/100).
MLM ranks #428 out of 37696 tracked stocks by institutional interest — one of the most closely watched names in our coverage.
1078 institutions disclose a position in MLM, but none treat it as a major bet — even Gardner Russo & Quinn LLC, its most concentrated holder, allocates just 4.6% of its own portfolio to it.
Douglas Lane & Associates, LLC has added to its MLM position for two straight quarters, increasing it by $2.1M to reach $26.8M today.
Congress Asset Management Co has trimmed its MLM position for two straight quarters, cutting it by $123.4M while still holding $16.7M.
MLM is up 0.7% today, and institutions have been net buyers of $16.4B this quarter — today's price move and the underlying institutional flow are pointing the same direction.
MLM posted net income of $2.5B over the trailing twelve months, and currently trades at a P/E of 12.0.
+$3.7B
Total Buy Value
$2.2B
Total Sell Value
474
Net Buyers
504
Net Sellers
MLM
Q2 2026
Top 5 Institutional Movers
+$758.4M
+$321.3M
-$270.8M
-$214.4M
MLM does not currently have enough recent insider (Form 4) trading activity to compute a convergence signal against its 13F institutional flows.
13F data as of 2026-09-30 quarterly filings. Note: many large institutions file close to the 45-day post-quarter deadline, so early-quarter flow figures can shift substantially as more filings arrive.
12-Month Buy/Sell Activity
| Action | Insider | Date | Value |
|---|---|---|---|
| Sell | PEREZ LAREE E | 2025-08-08 | $637K |
| Sell | McCunniff Donald A. | 2025-03-05 | $633K |
| Buy | Michael J Petro | 2025-03-04 | $250K |
| Action | Member | Trade Date | Amount |
|---|---|---|---|
| Sell (Full) | Daniel S Sullivan Senate | 2022-11-30 | $1K–$15K |
No Form 144 planned sale filings in the last 90 days
No Schedule 13D/13G filings for this ticker
9
Filings (14d)
AI summary pending
View Full Filing (SEC EDGAR)AI summary pending
View Full Filing (SEC EDGAR)AI summary pending
View Full Filing (SEC EDGAR)AI summary pending
View Full Filing (SEC EDGAR)AI summary pending
View Full Filing (SEC EDGAR)In a brief 8-K, Martin Marietta Materials (MLM) provided an update on its planned acquisition of Lhoist North America, Inc. (LNA). The company said it received all necessary regulatory approvals on August 5, 2026, clearing a key condition for the deal, which was originally agreed to on June 27, 2026. Martin Marietta still expects the transaction to close in the third quarter of 2026.
View Full Filing (SEC EDGAR)No AI summary for this filing type
View Full Filing (SEC EDGAR)Martin Marietta announced that it has promoted Michael J. Petro to Executive Vice President and Chief Financial Officer. His new employment terms include a $750,000 base salary, a target annual bonus of 100% of base salary, a target long-term incentive award of 260% of base salary, and a one-time restricted stock unit grant worth $5 million that vests ratably on the sixth, seventh, and eighth anniversaries of the grant date. If he is terminated without cause or leaves for good reason, he would receive a severance package equal to three times his base salary plus target bonus, along with continued benefits and equity vesting. The filing also includes a three-year non-compete and non-solicitation restriction and a separate change-of-control protection agreement.
View Full Filing (SEC EDGAR)Martin Marietta Materials (MLM) announced its second-quarter 2026 financial results on July 30, 2026, with the press release attached as Exhibit 99.1 to this 8-K. The excerpt itself doesn't include the actual figures, so we don't have revenue or earnings numbers to point to here.
View Full Filing (SEC EDGAR)573284106
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