OSHKOSH 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. )

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Soliciting Material under §240.14a-12

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Oshkosh Corporation

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Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11.

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March 27, 2025

Dear Fellow Oshkosh Corporation

Shareholder

Oshkosh continued to deliver strong performance in 2024, using our “Innovate. Serve. Advance.” strategy as our guide. Strong demand and operational improvements enabled us to deliver record revenue of $10.7 billion and diluted earnings per share of $10.35, representing increases of 11% and 14%, respectively, compared to 2023.

Oshkosh’s commitment to our purpose — to make a difference in the lives of those who build, serve and protect communities across the globe — drives the Company’s success. We have leveraged our core capabilities in electrification to introduce first-of-their-kind products across the enterprise that deliver added value for our customers. Our new, all-electric, fully integrated McNeilus® Volterra ZSL™ refuse and recycling vehicle and our Next Generation Delivery Vehicle (NGDV) for the U.S. Postal Service are the latest examples of supporting sustainability initiatives of our customers while improving functionality for drivers and operators. We developed autonomous tactical vehicles for our military customers and leverage that capability now for commercial applications, where active safety and automation are critical to safe and efficient operation. We are also introducing our ClearSky Smart Fleet™ connected telematics platform across our product suite and continue to add features that enhance our customers’ experience with our products. We believe this focused pursuit of innovation has positioned us to deliver strong shareholder value in 2025 and beyond.

We have diversified our business into new markets and adjacent product lines over the past several years, reducing cyclicality and advancing our position as a leader in specialty equipment for the world’s toughest jobs. In the first full year under our ownership, AeroTech had record sales in 2024. With the recent acquisitions of Hinowa and AUSA, we have a stronger foothold in the European agriculture, material handling, construction, landscaping and specialty equipment markets and can leverage these companies’ broader product offerings in other geographies we serve. The Company has continued investing in growth through capital expenditures, including production capabilities at our facilities in Tennessee and South Carolina, and increased our research and development spend to position the Company for long-term value creation.

In 2024, Oshkosh was honored to be named one of the Ethisphere Institute’s World’s Most Ethical Companies for the ninth consecutive time. We were also named to the Dow Jones Sustainability World Index for the sixth consecutive year and selected as one of Fast Company’s 2024 World’s Most Innovative Companies; we are proud to receive numerous other accolades recognizing our long-term commitment to our People First culture, sustainability and market-leading technology.

Finally, after over a decade as a board member and consistent with the Company’s retirement age by-laws, I will not be standing for re-election to the Board. We have robust succession planning efforts, and I have tremendous confidence in this talented Board that will continue to support Oshkosh Corporation as it executes its strategy into the future.

On behalf of the Board and our approximately 18,500 Oshkosh Corporation team members, thank you for your continued support of Oshkosh Corporation. It has been an honor to serve the Company.

Sincerely,

HELP US HELP THE ENVIRONMENT

We encourage all shareholders to voluntarily elect to receive all proxy materials electronically. This helps reduce the paper mailed to you and supports our goal of minimizing our environmental footprint.

OUR ENVIRONMENTAL IMPACT

In 2024, we had 35,447 investors enrolled in the e-delivery program. Electronic delivery is efficient, cost effective and the response rate is better than the receipt of full set and notice only. Our promotion of this method of delivery has resulted in a 13.25% increase in enrollment. Below are statistics that are representative of our efforts:

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