WABASH NATIONAL Corp

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

SCHEDULE 14A

Proxy Statement Pursuant to Section 14(a) of the

Securities Exchange Act of 1934

(Amendment No. )

Filed by the Registrant

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Filed by a Party other than the Registrant

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WABASH NATIONAL CORPORATION

(Name of Registrant as Specified in Its Charter)

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

Letter from the President and Chief Executive Officer

Dear Stockholders,

In 2025, Wabash continued executing our long-term strategy while navigating a difficult cyclical freight and equipment market. Our resilient business model, disciplined operations and focused capital allocation enabled us to continue our strategic journey.

Our Upfit and Parts & Services segment provided stability and reinforced our expansion across thefirst-to-final mile transportation value chain. Parts & Services remains a key driver of recurring revenue growth, customer lifecycle engagement and long-term value creation.

We also continued investing in commercial capabilities, enhancing strategic account engagement, data-driven market intelligence, dealer and channel enablement and lifecycle customer experience. These investments strengthen our ability to capture targeted growth opportunities and deepen customer partnerships, while positioning us to accelerate performance as market demand improves.

Innovation, ecosystem partnerships and manufacturing productivity investments remain central to our competitive differentiation. At the same time, we maintained strong capital discipline, supply chain resilience and domestic production capabilities to support long-term growth and operational performance.

Our performance ultimately reflects the strength of our people and our culture. Across Wabash, our team continues to operate with accountability, discipline and a commitment to continuous improvement. Their focus on safety, quality, operational excellence and customer success is the foundation of our resilience and long-term value creation.

Looking ahead to 2026, we expect to continue executing our customer-focused strategy, expanding aftermarket parts revenue and customer support related services. We remain focused on strengthening our commercial effectiveness, leading with operational excellence and driving differentiated product innovation to assist customers navigating evolving freight, regulatory and technology transitions.

We remain confident in the long-term fundamentals of the transportation and logistics markets we serve. Wabash is positioned to outperform over the course of a pending freight market upswing through focused execution, aftermarket and upfit growth, differentiated technology and strengthened commercial execution.

On behalf of our leadership team, thank you to our employees, customers, partners and stockholders for your continued trust and support.

With appreciation,

Brent L. Yeagy

President and Chief Executive Officer

WABASH NATIONAL CORPORATION

3900 McCarty Lane

Lafayette, Indiana 47905

Notice of Annual Meeting of Stockholders

Items of Business:

To consider any other matters that properly come before the Annual Meeting or any adjournment or postponement thereof. Management is currently not aware of any other business to come before the Annual Meeting.

Each outstanding share of Wabash National Corporation (NYSE: WNC) Common Stock entitles the holder of record at the close of business on March 16, 2026 to receive notice of, and to vote at, the Annual Meeting or any adjournment or postponement of the Annual Meeting. Shares of our Common Stock can be voted at the Annual Meeting only if the holder is present by virtual presence online or by valid proxy. Management cordially invites you to attend the Annual Meeting by virtual presence online.

IMPORTANT NOTICE REGARDING THE AVAILABILITY OF PROXY MATERIALS FOR THE STOCKHOLDERS MEETING TO BE HELD ON MAY 13, 2026:

The Proxy Statement, Annual Report and the means to vote by internet are available at http://www.proxyvote.com.

By Order of the Board of Directors,

M. Kristin Glazner

Senior Vice President, Chief Administrative Officer,

Corporate Secretary

March 31, 2026

Whether or not you expect to attend by virtual presence online, we urge you to vote your shares at your earliest convenience. This will ensure the presence of a quorum at the Annual Meeting. Promptly voting your shares by signing, dating and returning the proxy card mailed with your notice, or by voting via the internet or by telephone, will save us the expense and extra work of additional solicitation. An addressed envelope for which no postage is required if mailed in the United States is enclosed with your proxy card. Submitting your proxy now will not prevent you from voting your shares at the meeting by virtual presence online if you desire to do so, as your proxy is revocable at your option. Your vote is important, so please act today.

2026 Annual Meeting of Stockholders on May 13, 2026

Proxy Statement