Martin Midstream Partners L.P. (NASDAQ: MMLP) today announced the retirement of William “Jeff” Posey, Vice President of Fertilizer, effective December 31, 2025.

Following Mr. Posey’s retirement, Michael W. Lawrence, Senior Vice President – Sulfur Services, will assume responsibility for the fertilizer division, consolidating Martin’s sulfur and sulfur-based fertilizer operations under his leadership.

Mr. Posey has dedicated more than two decades of distinguished service to Martin Midstream Partners. He began his tenure in December 1999 as Fertilizer Sales Manager for the Southern Region. His commitment and expertise led him to transition in 2013 to serve as General Manager of the fertilizer division, and in June 2019, he was promoted to Vice President of Fertilizer.

"Jeff has had a distinguished career spanning over two decades of leadership and service to the company," said Bob Bondurant, President and Chief Executive Officer of Martin Midstream GP LLC, the general partner of MMLP. "He has led with integrity, deep industry expertise, and an unwavering commitment to the success of Martin’s sulfur-based fertilizer division. I extend my deepest gratitude for his years of service, leadership, and dedication."

Throughout his career, Mr. Posey remained actively involved in industry leadership as a dedicated member of The Fertilizer Institute, Texas Ag Industries, and the Southwest Fertilizer Conference, where he also served on the planning committee.

In a strategic move to enhance commercial activities, Michael “Mike” Lawrence has been appointed to lead fertilizer services in addition to his current duties. Mr. Lawrence is a highly experienced executive who joined Martin as General Manager of the Sulfur Services division in July 2008, after spending close to 10 years at Koch Industries in the sulfuric acid group. He was promoted to Vice President – Sulfur in May 2011 and now serves as Senior Vice President – Sulfur Services. He holds a B.A. in Communications from the University of Kansas.

As a respected industry leader, Mr. Lawrence is actively involved with The Sulphur Institute, having served in a variety of leadership roles including two-year terms as Vice Chair, Chair, and Immediate Past Chair. Since 2009, he has served on the Board of Directors and as a member of the Executive Committee.

“With over 27 years of experience in the sulfur and sulfuric acid industries, Mike is the obvious candidate to lead Martin’s commercial sulfur and fertilizer businesses,” stated Mr. Bondurant. “This organizational alignment allows us to fully leverage the technical and operational synergies between our sulfur and fertilizer divisions. Mike’s proven leadership, his industry expertise and commitment to excellence will provide consistency for our business partners and strategically position this core segment for continued success.”

About Martin Midstream Partners L.P.

Martin Midstream Partners L.P., headquartered in Kilgore, Texas, is a publicly traded limited partnership with a diverse set of operations focused primarily in the Gulf Coast region of the United States. MMLP’s primary business lines include: (1) terminalling, processing, and storage services for petroleum products and by-products; (2) land and marine transportation services for petroleum products and by-products, chemicals, and specialty products; (3) sulfur and sulfur-based products processing, manufacturing, marketing and distribution; and (4) marketing, distribution, and transportation services for natural gas liquids and blending and packaging services for specialty lubricants and grease. To learn more, visit www.MMLP.com or find us on LinkedIn and Facebook.

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