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MLMMartin Marietta Materials · Insider ownership research

Martin Marietta Materials insiders: what they own and what they did with it

None of it through sales. No officer or director reported an open-market sale in this period.

Updated Oct 9, 2026 from SEC filings · covers Oct 10, 2025 to Oct 9, 2026
0
buyers among officers and directors, past 12 months
0 of 20
officers and directors sold shares, past 12 months
Recent activity · past 30 days, Sep 10, 2026 to Oct 9, 2026

No officer or director trades were reported for the past 30 days. The most recent before that:

Aug 3, 2026Michael Petro had 368 shares ($200K) withheld by the company for taxes (not a market sale). That is 2.4% of the total stake held that day.
WhoSharesPrice% of total stakeTotal stake afterTrade dateFiled
Michael Petro
SVP and CFO
368$542.272.4%15KAug 3, 2026Aug 4, 2026

"% of total stake" is the shares in this event against all the vested shares the person held that day, across every share class and holding entity, after that day's vesting. "n/a" means the person's holdings don't reconcile, or the row is a purchase. "Holdings record incomplete" means more shares were sold than the filings show the person held that day, so a percentage would be wrong.

Is this normal? Less than usual: no sales, against a 5-year average of 14K shares a year. 0 insiders sold; the average is 2 a year. Year by year
Latest filing: Filed Sep 2 for a stock award on Aug 31. David Wajsgras received an award of 78 shares. Filing
55 SEC ownership filings in the period · See the evidence

What stands out

Tax withholding outweighed market sales: the company withheld $11.2M of officers' and directors' shares for taxes, against $0 sold on the open market. The largest was Howard Nye ($8.7M withheld).Largest withholding, Feb 17, 2026

Percentages cover 16 of 20 officers and directors. 4 are left out

i
Left out: George Schoen, Martin Lyons, Gayla Delly and Philipp Niemann (held no vested shares at the start).
Disclosed company stock is not an insider's whole wealth.

Outside holders, reported separately

LNA Holding SRL reported no open-market sales in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.

Details

Common questions

Is the Martin Marietta Materials CEO selling stock?

No. Howard Nye reported no open-market sales in the past 12 months.

Are any Martin Marietta Materials insiders buying?

No. Officers and directors reported no purchases in the past 12 months.

The evidence

Who sold0 officers and directors: amount, % of holdings, trading plan
Who soldAmount% of holdingsTrading plan

Outside holder, reported separately: LNA Holding SRL (a 10% owner, not part of management). No open-market sales reported in the period. Holds 10.95M shares. Latest filing

The full ownership picture20 of 20 insiders fully reconciled · 20 officers and directors

Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.

InsiderHeld Oct 9, 2025SoldHeld Oct 9, 2026Still held
Howard Nye
Chairman, Pres & CEO, Director
223K0246Kno sales
Vesting, gifts, unvested awards and holding lines for Howard Nye
0shares vested or exercised
0gifted (net of own trusts)
−13Kwithheld by the company for taxes
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock152,174176,038
Charles Howard Nye Irrevocable TrustCommon Stock70,40070,400
Roselyn Bar
Executive Vice President
64K063Kno sales
Vesting, gifts, unvested awards and holding lines for Roselyn Bar
0shares vested or exercised
−488gifted (net of own trusts)
−486withheld by the company for taxes
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock63,56862,594
Sue Cole
Director
25K025Kno sales
Vesting, gifts, unvested awards and holding lines for Sue Cole
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock20,39420,394
IraCommon Stock4,2504,250
John Koraleski
Director
16K016Kno sales
Vesting, gifts, unvested awards and holding lines for John Koraleski
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock8,6788,822
JJ KORALESKI and SF KORALESKI CO-TTEE KORALESKI LIVING TRUST U/A DTD 01/18/1991Common Stock4,9004,900
SJK HOLDINGS and INVESTMENTS, LLCCommon Stock2,0002,000
Laree Perez
Director
15K016Kno sales
Vesting, gifts, unvested awards and holding lines for Laree Perez
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock15,41715,730
Christopher Samborski
i
Started reporting during the period; starting holdings are from the Form 3.
EVP, COO
14K022Kno sales
Vesting, gifts, unvested awards and holding lines for Christopher Samborski
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Started reporting during the period; starting holdings are from the Form 3.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock13,66121,762
Robert Cardin
SVP, Controller & CAO
11K012Kno sales
Vesting, gifts, unvested awards and holding lines for Robert Cardin
0shares vested or exercised
0gifted (net of own trusts)
−1.2Kwithheld by the company for taxes
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock11,09812,459
Michael Petro
SVP and CFO
11K024Kno sales
Vesting, gifts, unvested awards and holding lines for Michael Petro
0shares vested or exercised
0gifted (net of own trusts)
−1.4Kwithheld by the company for taxes
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock10,80724,322
Donald Slager
Director
4.8K05.1Kno sales
Vesting, gifts, unvested awards and holding lines for Donald Slager
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock4,7515,064
David Wajsgras
Director
4.5K05.1Kno sales
Vesting, gifts, unvested awards and holding lines for David Wajsgras
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock4,5295,106
Jason Flynn
SVP and CIO
4.5K05.5Kno sales
Vesting, gifts, unvested awards and holding lines for Jason Flynn
0shares vested or exercised
0gifted (net of own trusts)
−437withheld by the company for taxes
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock4,5225,494
Thomas Pike
Director
4.5K05Kno sales
Vesting, gifts, unvested awards and holding lines for Thomas Pike
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock4,4935,029
Dorothy Ables
Director
3.9K04.2Kno sales
Vesting, gifts, unvested awards and holding lines for Dorothy Ables
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock3,9084,221
Donald McCunniff
i
New Form 3 filed 2024-09-04; earlier filings set aside.
EVP and CHRO
3.5K07.5Kno sales
Vesting, gifts, unvested awards and holding lines for Donald McCunniff
0shares vested or exercised
0gifted (net of own trusts)
−242withheld by the company for taxes
none reportedunvested awards, start → end
  • New Form 3 filed 2024-09-04; earlier filings set aside.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock3,5237,518
Anthony Foxx
Director
2.3K02.6Kno sales
Vesting, gifts, unvested awards and holding lines for Anthony Foxx
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock2,3022,615
Mary Mack
Director
6010914no sales
Vesting, gifts, unvested awards and holding lines for Mary Mack
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock601914
George Schoen
i
Started reporting during the period; starting holdings are from the Form 3.
EVP, GC and Corp. Secretary
0024Kno sales
Vesting, gifts, unvested awards and holding lines for George Schoen
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Started reporting during the period; starting holdings are from the Form 3.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock023,673
Martin Lyons
i
Started reporting during the period; starting holdings are from the Form 3.
Director
00442no sales
Vesting, gifts, unvested awards and holding lines for Martin Lyons
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Started reporting during the period; starting holdings are from the Form 3.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock0442
Gayla Delly
i
Started reporting during the period; starting holdings are from the Form 3.
Director
00313no sales
Vesting, gifts, unvested awards and holding lines for Gayla Delly
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
  • Started reporting during the period; starting holdings are from the Form 3.
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock0313
Philipp Niemann
Director
00337no sales
Vesting, gifts, unvested awards and holding lines for Philipp Niemann
0shares vested or exercised
0gifted (net of own trusts)
none reportedunvested awards, start → end
Held throughShare classOct 9, 2025Oct 9, 2026
DirectCommon Stock0337

20 of 20 insiders fully reconciled: starting holdings plus reported transactions match ending holdings (20 exactly, 0 with a minor or footnoted difference). Percentages cover 16 of 20 officers and directors. Left out: George Schoen, Martin Lyons, Gayla Delly and Philipp Niemann (held no vested shares at the start). "Still held" compares ending with starting vested shares; a plus sign means the holding grew.

Is this normal? Selling year by year5 earlier years to compare with

Less than usual: no sales, against a 5-year average of 14K shares a year. 0 insiders sold; the average is 2 a year.

12 months endingShares soldInsiders who soldProceeds
Oct 9, 2026
Latest 12 months
00$0
Oct 9, 2025
1 year earlier
2.4K2$1.3M
Oct 9, 2024
2 years earlier
32K3$19.1M
Oct 10, 2023
3 years earlier
4.1K2$1.7M
Oct 10, 2022
4 years earlier
01$145
Oct 10, 2021
5 years earlier
30K2$9.5M

Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.

Known gaps and uncertaintyEvery officer and director reconciles

Every officer and director reconciles for this period.

Inferred rename: "SJK HOLDINGS & INVESTMENTS, LLC" is treated as the same holder as "SJK HOLDINGS and INVESTMENTS, LLC", because the old name was never reported again and the new one opened with the same balance (2,000 shares). Old name, new name

Inferred rename: "JJ KORALESKI & SF KORALESKI CO-TTEE KORALESKI LIVING TRUST U/A DTD 01/18/1991" is treated as the same holder as "JJ KORALESKI and SF KORALESKI CO-TTEE KORALESKI LIVING TRUST U/A DTD 01/18/1991", because the old name was never reported again and the new one opened with the same balance (4,900 shares). Old name, new name

Inferred typo: the share class "Shares of Common Stock, par value $0.01" is treated as the same class as "Shares of Common Stock, par value $ 0.01" on 1 holding line, because the two spellings are nearly identical and each balance carried over exactly. Example (NNS Holding, 3,429,747 shares): old title, new title

External context: we only cite outside events when a documented connection exists. None is shown for this period.

Sources and methodology2,010 filings from SEC EDGAR, and how we read them

All 2,010 Forms 3, 4 and 5 filed for Martin Marietta Materials (SEC CIK 916076) from May 6, 1999 to Sep 2, 2026, retrieved from SEC EDGAR on Oct 9, 2026. Prices are the ones reported in each filing, often weighted averages. 237 older filings exist only on paper and could not be read.

Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.

Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".

Full methodology

Former or inactive filers (34)No filing in 18 months; last reported balances, not in any total
NameLast filedLast reported balance
James NickolasFeb 25, 202526,643 shares, last reported balance as of Feb 24, 2025
Oliver BrooksFeb 25, 20255,178 shares, last reported balance as of Feb 24, 2025
Bradley KohnFeb 25, 20253,625 shares, last reported balance as of Feb 21, 2025
Michael QuillenMay 10, 202421,306 shares, last reported balance as of May 9, 2024
Kelly BennettFeb 27, 20244,454 shares, last reported balance as of Feb 26, 2024
John MohrDec 5, 202314,974 shares, last reported balance as of Dec 1, 2023
Craig LaTorreDec 5, 20238,634 shares, last reported balance as of Dec 1, 2023
Smith DavisMar 1, 20235,255 shares, last reported balance as of Feb 28, 2023
Daniel GrantFeb 23, 202119,065 shares, last reported balance as of Feb 22, 2021
Stephen Zelnak Jr.Jul 10, 20204,955 shares, last reported balance as of Jun 10, 2020
Dennis RedikerMar 1, 201917,775 shares, last reported balance as of Feb 28, 2019
Dana GuzzoFeb 26, 201922,027 shares, last reported balance as of Feb 22, 2019
David MaffucciJun 1, 201817,874 shares, last reported balance as of May 31, 2018
Anne LloydMay 24, 201759,786 shares, last reported balance as of May 22, 2017
William McDonaldMar 2, 201717,869 shares, last reported balance as of Feb 28, 2017
Frank Menaker Jr.Mar 2, 201620,576 shares, last reported balance as of Mar 1, 2016
Richard VinrootMar 2, 201615,955 shares, last reported balance as of Feb 29, 2016
Bruce VaioDec 13, 201222,301 shares, last reported balance as of Dec 11, 2012
SOUTHEASTERN ASSET MANAGEMENT INC/TN/May 25, 20126,205,303 shares, last reported balance as of May 18, 2012
SPO ADVISORY CORPAug 5, 201118,728,440 shares, last reported balance as of Aug 5, 2011
Daniel ShepherdMay 25, 201147,500 shares, last reported balance as of May 23, 2011
James TeshJan 28, 2011No balance on record
Jonathan StewartDec 10, 201040,073 shares, last reported balance as of Dec 9, 2010
Philip SiplingDec 3, 200960,601 shares, last reported balance as of Dec 1, 2009
NNS HoldingOct 7, 20083,696,132 shares, last reported balance as of Dec 14, 2007
Marcus BennettMay 30, 20086,962 shares, last reported balance as of May 28, 2008
Donald MoeFeb 14, 200738,745 shares, last reported balance as of Feb 14, 2007
David WattersonAug 8, 200612,218 shares, last reported balance as of Aug 4, 2006
William SansomJul 5, 20064,109 shares, last reported balance as of Jun 30, 2006
Janice HenryJun 1, 200625,839 shares, last reported balance as of Jun 1, 2006
James ReedMay 26, 20056,244 shares, last reported balance as of May 24, 2005
Donald Easterlin IIIDec 10, 20038,170 shares, last reported balance as of Dec 8, 2003
Richard AdamsonAug 20, 2003No balance on record
Bobby LeonardAug 20, 2003No balance on record

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