# EDGAR Filing Document

**Accession Number:** 0000916076
**File Stem:** 0000950157-26-000549
**Filing Date:** 2026-4
**Character Count:** 12686
**Document Hash:** beec2f3f9e76b27b091cf9394c246aee
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000950157-26-000549.hdr.sgml**: 20260427

**ACCESSION NUMBER**: 0000950157-26-000549

**CONFORMED SUBMISSION TYPE**: 8-K

**PUBLIC DOCUMENT COUNT**: 13

**CONFORMED PERIOD OF REPORT**: 20260427

**ITEM INFORMATION**: Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

**ITEM INFORMATION**: Financial Statements and Exhibits

**FILED AS OF DATE**: 20260427

**DATE AS OF CHANGE**: 20260427

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MARTIN MARIETTA MATERIALS INC
- **CENTRAL INDEX KEY:** 0000916076
- **STANDARD INDUSTRIAL CLASSIFICATION:** MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
- **ORGANIZATION NAME:** 01 Energy & Transportation
- **EIN:** 561848578
- **STATE OF INCORPORATION:** NC
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 8-K
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-12744
- **FILM NUMBER:** 26901287

**BUSINESS ADDRESS:**
- **STREET 1:** 4123 PARKLAKE AVE
- **CITY:** RALEIGH
- **STATE:** NC
- **ZIP:** 27612
- **BUSINESS PHONE:** 919-781-4550

**MAIL ADDRESS:**
- **STREET 1:** 4123 PARKLAKE AVE
- **CITY:** RALEIGH
- **STATE:** NC
- **ZIP:** 27612

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#### UNITED STATES

#### SECURITIES AND EXCHANGE COMMISSION

#### WASHINGTON, D.C. 20549

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### FORM 8-K

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#### CURRENT REPORT

#### Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

#### Date of Report (Date of earliest event reported): April 27, 2026

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## Martin Marietta Materials, Inc.

#### (Exact name of Registrant as Specified in Its Charter)

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| | | |
|:---|:---|:---|
| **North Carolina**<br>| **001-12744**<br>| **56-1848578**<br>|
| **(State or Other Jurisdiction of Incorporation)** | **(Commission File Number)** | **(IRS Employer Identification No.)** |

---

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| | |
|:---|:---|
| **4123 Parklake Avenue Raleigh, North Carolina** | **27612**<br>|
| **(Address of Principal Executive Offices)** | **(Zip Code)** |

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#### Registrant's Telephone Number, Including Area Code: (919) 781-4550

#### (Former Name or Former Address, if Changed Since Last Report)
Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

#### Securities registered pursuant to Section 12(b) of the Act:

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| | |
|:---|:---|
| **Title of each class** | **Name of each exchange on which registered** |
| Common Stock, $.01 par value per share <br> **MLM**<br>| The New York Stock Exchange  |

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Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§ 230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§ 240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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#### Item 5.02. Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.
On April 27, 2026, Martin Marietta Materials, Inc. (the "Company") announced that the Company has appointed Christopher W. Samborski, to serve as the Company's Executive Vice President and Chief Operating Officer, effective as of May 1, 2026 (the "Effective Date").

Mr. Samborski, age 45, joined the Company in August 2018 and currently serves as President of the West and Specialties Divisions. In January 2025, he assumed the leadership of the West Division and retained his responsibilities as President of Specialties which he has led since January 2022. Mr. Samborski served as Vice President of Strategic Finance, Procurement and Supply Chain beginning in January 2020 prior to his current roles and served as Vice President of Strategic Finance from 2018 to 2020. Prior to joining the Company, Mr. Samborski spent close to ten years in leadership roles at Caterpillar Inc. and Johnson & Johnson. Mr. Samborski began his career with General Electric Company and was selected for and completed GE's elite Operations Management Leadership Program. Mr. Samborski holds a Bachelor of Science degree in industrial engineering from the University of Wisconsin-Madison and an MBA in strategy and general management from the University of Michigan's Ross School of Business, where he received the Ross Distinguished Scholar Award and graduated with high distinction.

In connection with his promotion to the role of Executive Vice President, Chief Operating Officer, the Company and Mr. Samborski executed an offer letter (the "Offer Letter"), an amended and restated employment agreement (the "Employment Agreement") and an amended and restated employment protection agreement (the "Employment Protection Agreement"). Pursuant to the Offer Letter, Mr. Samborski's base salary will be $775,000, his target annual incentive award will be 100% of base salary, his target long-term incentive award will be 260% of base salary, and he will receive a one-time grant of restricted stock units with a grant date value of $5,000,000, which will vest ratably on the sixth, seventh, and eighth anniversaries of the grant date, subject to Mr. Samborski's continued employment through such date and the other terms and conditions applicable to ordinary course grants of restricted stock units to the Company's executive officers. In addition to the terms described in the Offer Letter, the amended Employment Agreement provides that in the event of a termination by the Company without cause or by Mr. Samborski for good reason, Mr. Samborski is entitled to a severance amount equal to three times the sum of his base salary and target bonus, continued medical and dental benefits for up to three years, and continued vesting of his outstanding equity awards. The Employment Agreement includes a three-year post-termination, non-competition, non-solicitation, and confidentiality covenant. The Employment Protection Agreement, which aligns with the Company's Employment Protection Agreements provided to other executive officers, provides for severance benefits upon a qualifying termination following a change of control of the Company equal to three times Mr. Samborski's annual compensation (defined as base salary and the highest annual bonus paid in the preceding five years) and continuation of benefits for 36 months.

Mr. Samborski received the following compensation and benefits in his current position at the Company since January 1, 2025: an annual base salary of $527,258, a target annual short-term incentive award of 90% of base salary, a target annual long-term incentive award of 200% of base salary, and a one-time grant of restricted stock units with a grant date value of $2,000,000, which vests ratably on the third, fourth, and fifth anniversaries of the grant date. Other than such compensation arrangements, Mr. Samborski has no interest in any transaction that would require disclosure pursuant to Item 404(a) of Regulation S-K.

A copy of the press release announcing the appointment of Mr. Samborski as Chief Operating Officer of the Company is attached to this Current Report on Form 8-K as Exhibit 99.1.

#### Item 9.01 Financial Statement and Exhibits.
(d) Exhibits <br>[99.1](ex99-1.htm) [Press Release dated April 27, 2026](ex99-1.htm)

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;

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#### SIGNATURES
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

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| | | |
|:---|:---|:---|
|  | MARTIN MARIETTA MATERIALS, INC. | MARTIN MARIETTA MATERIALS, INC. |
|  | (Registrant) | (Registrant) |
| Date: April 27, 2026 | By:  | /s/ George F. Schoen |
|  |  | George F. Schoen, Executive Vice President, General  |
|  |  | Counsel and Corporate Secretary |

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## Exhibit 99.1

**Exhibit 99.1**<br>

![](image0.jpg)

MARTIN MARIETTA APPOINTS

CHRISTOPHER W. SAMBORSKI CHIEF OPERATING OFFICER

**Raleigh, N.C. (April 27, 2026)** – Martin Marietta Materials, Inc. (NYSE: MLM) (Martin Marietta or the Company) a leading national supplier of aggregates and other building materials, today announced the appointment of Chris Samborski as Executive Vice President and Chief Operating Officer, effective May 1, 2026.

Mr. Samborski has extensive experience leading operating and finance teams. He most recently served as President of Martin Marietta's West and Specialties Divisions, where he was responsible for the overall operations and strategic direction of those business units. Under his leadership, both the West and Specialties Divisions achieved significant growth and success. Mr. Samborski previously served in several other leadership positions at Martin Marietta, including Vice President of Strategic Finance, Procurement and Supply Chain. Prior to joining Martin Marietta in 2018, Mr. Samborski spent close to ten years in leadership roles at Caterpillar Inc. and Johnson & Johnson, building broad and deep experience in business strategy, operations management and continuous improvement.

"Chris is an experienced and skilled leader whose effective management has had a meaningful impact on Martin Marietta," said Ward Nye, Chair and CEO of Martin Marietta. "Chris has been with our Company for nearly a decade, and he has consistently demonstrated a true commitment to Martin Marietta, our people, our culture and our ongoing pursuit of excellence. He is the ideal person to take on the COO role and to continue leading, alongside our deeply capable and talented team, as we guide our Company to even greater success."

"I'm honored to take on this new opportunity, particularly during this period of strong performance and growth for our business," said Mr. Samborski. "Martin Marietta closed out 2025 by delivering record results across the portfolio, and I look forward to working closely with our teams to build on this positive momentum in 2026 and beyond."

With Mr. Samborski's appointment, Kirk Light has assumed leadership of the West and Specialties Divisions while also retaining his historic duties as President of the Southwest Division.

#### About Chris Samborski
Mr. Samborski has held multiple leadership roles across operations and finance since joining Martin Marietta in 2018. Prior to serving as President of the West and Specialties Divisions, he was President of the Specialties Division (2022-2025), Vice President of Strategic Finance, Procurement and Supply Chain (2020-2021) and Vice President of Strategic Finance (2018-2020).

Before joining Martin Marietta, Mr. Samborski began his career with General Electric Company and was selected for and completed GE's elite Operations Management Leadership Program. He subsequently held leadership roles at Johnson & Johnson as well as Caterpillar Inc. He holds a Bachelor of Science degree in Industrial Engineering from the University of Wisconsin-Madison and an MBA in Strategy and General Management from the University of Michigan's Ross School of Business.

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![](image0.jpg)

#### <br>

#### About Martin Marietta
Martin Marietta, a member of the S&P 500 Index, is an American-based company and a leading supplier of aggregates and other building materials. Through a network of operations spanning 28 states, Canada and The Bahamas, dedicated Martin Marietta teams supply the resources necessary for building the solid foundations on which our communities thrive. Martin Marietta's Specialties business provides high-purity magnesia and dolomitic lime products used worldwide in environmental, industrial, agricultural and other specialty applications. For more information, visit www.martinmarietta.com or www.magnesiaspecialties.com.

Investor Contact:

#### Jacklyn Rooker
Vice President, Investor Relations

+1 (919) 510-4736

<u>Jacklyn.Rooker@martinmarietta.com</u>

MLM-G.

<br>