Martin Marietta Materials MLM Insider Ownership

NYSE MLM
$479.84 +0.75 (+0.16%)
At close: Sep 30, 2026 · 4:00 PM EDT

Insider Holdings by Owner

492.92K Shares

Insider Ownership Statistics

as of 30 Sep, 2026
Insider Ownership
0.937%
▲+0.016% pp QoQ
Shares Held by Insiders
563.32K
filed for Sep 2026
▲+1.72% QoQ
Shares Outstanding
60.10Mn
60,100,000 shares
Direct Holdings
492.92K
Indirect: 70.40K
Net Shares Traded (QoQ)
+9.51K
net buying in Sep 2026
Insiders Holding Shares
28
with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding
Latest —
Average ownership —
Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold
Latest quarter —
Net over range —
Buying quarters —

Insider Ownership Summary

Quarter ending 30 Sep, 2026

MLM's three largest insider shareholders as of September 29, 2026 are C Howard Nye (Chairman, Pres Ceo, 176.04K shares), C Howard Nye (Chairman, Pres Ceo, 70.40K shares), Roselyn R Bar (Executive Vice President, 62.59K shares).

Form 4 Holdings

Insiders Holding MLM

Insiders 28
Shares held 492.92K
Of outstanding 0.820%
# Insider Position Direct Indirect Total Share of Insiders Last Filed
1 C Howard Nye Chairman, Pres Ceo 176,038 0 176,038 35.7% 03 Mar, 2026
2 Roselyn R Bar Executive Vice President 62,594 0 62,594 12.7% 17 Dec, 2025
3 James Aj Nickolas Evp And Cfo 26,643 0 26,643 5.4% 25 Feb, 2025
4 Michael J Petro Svp And Cfo 24,322 0 24,322 4.9% 02 Sep, 2026
5 George Frederick Schoen Evp, Gc And Corp. Secretary 23,673 0 23,673 4.8% 03 Mar, 2026
6 Christopher William Samborski Evp, Coo 21,762 0 21,762 4.4% 05 May, 2026
7 Michael J Quillen Director 21,306 0 21,306 4.3% 10 May, 2024
8 Sue W Cole Director 20,394 0 20,394 4.1% 16 May, 2025
9 Laree E Perez Director 15,730 0 15,730 3.2% 18 May, 2026
10 John P Mohr Svp Cio 14,974 0 14,974 3.0% 05 Dec, 2023
11 Robert J Cardin Svp, Controller Cao 12,459 0 12,459 2.5% 25 Feb, 2026
12 John J Koraleski Director 8,822 0 8,822 1.8% 02 Mar, 2026
13 Craig M Latorre Sr. Vp, Chro 8,634 0 8,634 1.8% 05 Dec, 2023
14 Donald A. Mccunniff Evp And Chro 7,518 0 7,518 1.5% 03 Mar, 2026
15 Jason Paul Flynn Svp And Cio 5,494 0 5,494 1.1% 25 Feb, 2026
16 Smith W Davis Director 5,255 0 5,255 1.1% 01 Mar, 2023
17 Oliver W Brooks Svp Enterprise Excellence 5,178 0 5,178 1.1% 25 Feb, 2025
18 David C Wajsgras Director 5,106 0 5,106 1.0% 02 Sep, 2026
19 Donald W Slager Director 5,064 0 5,064 1.0% 18 May, 2026
20 Thomas Pike Director 5,029 0 5,029 1.0% 02 Sep, 2026
21 Kelly Gean Bennett Svp, Chro 4,454 0 4,454 0.9% 27 Feb, 2024
22 Dorothy M Ables Director 4,221 0 4,221 0.9% 18 May, 2026
23 Bradley D Kohn Svp, General Counsel And Secy 3,625 0 3,625 0.7% 25 Feb, 2025
24 Anthony R Foxx Director 2,615 0 2,615 0.5% 18 May, 2026
25 Mary T Mack Director 914 0 914 0.2% 18 May, 2026
26 Martin J Lyons Director 442 0 442 0.1% 02 Sep, 2026
27 Philipp Niemann Director 337 0 337 0.1% 25 Aug, 2026
28 Gayla J Delly Director 313 0 313 0.1% 18 May, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

2,205 Insider Transactions

Source SEC Form 4
Latest quarter Sep 2026
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
31 Aug, 2026 Martin J Lyons Director Acquired A 68 $518.70 $35.27K 442 Direct
31 Aug, 2026 Thomas Pike Director Acquired A 66 $518.70 $34.23K 5,029 Direct
31 Aug, 2026 David C Wajsgras Director Acquired A 78 $518.70 $40.46K 5,106 Direct
01 Sep, 2026 Michael J Petro Svp And Cfo Acquired A 9,331 $0.00 $0 24,322 Direct
21 Aug, 2026 Philipp Niemann Director Acquired A 337 $0.00 $0 337 Direct
03 Aug, 2026 Michael J Petro Svp And Cfo Disposed F 368 $542.27 $199.56K 14,991 Direct
29 May, 2026 Martin J Lyons Director Acquired A 61 $581.64 $35.48K 374 Direct
29 May, 2026 Thomas Pike Director Acquired A 59 $581.64 $34.32K 4,963 Direct
29 May, 2026 David C Wajsgras Director Acquired A 69 $581.64 $40.13K 5,028 Direct
14 May, 2026 David C Wajsgras Director Acquired A 313 $0.00 $0 4,959 Direct
14 May, 2026 Mary T Mack Director Acquired A 313 $0.00 $0 914 Direct
14 May, 2026 Dorothy M Ables Director Acquired A 313 $0.00 $0 4,221 Direct
14 May, 2026 Martin J Lyons Director Acquired A 313 $0.00 $0 313 Direct
14 May, 2026 Gayla J Delly Director Acquired A 313 $0.00 $0 313 Direct
14 May, 2026 Laree E Perez Director Acquired A 313 $0.00 $0 15,730 Direct
14 May, 2026 Donald W Slager Director Acquired A 313 $0.00 $0 5,064 Direct
14 May, 2026 Anthony R Foxx Director Acquired A 313 $0.00 $0 2,615 Direct
14 May, 2026 Thomas Pike Director Acquired A 313 $0.00 $0 4,904 Direct
01 May, 2026 Christopher William Samborski Evp, Coo Acquired A 8,101 $0.00 $0 21,762 Direct
01 Mar, 2026 George Frederick Schoen Evp, Gc And Corp. Secretary Acquired A 23,673 $0.00 $0 23,673 Direct