COHERENT CORP.

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549​

SCHEDULE 14A

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COHERENT CORP.

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LETTER FROM CHAIR OF THE BOARD

October 9, 2026​

Dear Fellow Coherent Shareholders

Fiscal year 2026 was another exceptional year for Coherent, with record revenue and significant margin expansion. Coherent is playing an increasingly critical role in enabling industry leaders to advance the next generation of technology across datacenters, communications and advanced manufacturing. These achievements reflect the commitment of our global team and the progress we have made in building a foundation for Coherent’s next phase of accelerated growth and continued innovation.

Extending Our Global Leadership in Photonics

By deliberately focusing our business, investments and capabilities on Coherent’s highest-growth opportunities, we have built a stronger, more profitable company with an enhanced ability to deliver shareholder value. Under the guidance of our world-class executive leadership team, we have advanced a broad photonics portfolio that is foundational to the performance, efficiency and scalability of AI datacenters. Our strong fiscal year 2026 results, including full-year revenue of $7.12 billion, up 22.5% from the prior year, demonstrate the strength of our strategy and the discipline of our execution.

Building on strong growth in our Datacenter and Communications segment, we continued to invest in the partnerships, innovation and capacity needed to meet accelerating demand for our technologies. We recently signed a letter of intent to receive up to $50 million in direct funding under the CHIPS and Science Act to expand our 6-inch Indium Phosphide manufacturing facility in Sherman, Texas. This planned expansion would significantly increase domestic production of critical AI-enabling technologies and further strengthen our manufacturing capabilities.

Coherent’s Extraordinary Opportunity Ahead

Coherent’s Board is actively engaged in overseeing this important momentum in the Company’s growth strategy to ensure we capitalize on the technology opportunity ahead of us and deliver for shareholders. The current Board composition brings together leaders with critical expertise in technology, operations and the materials, semiconductor, networking and laser industries, providing the skills and perspective necessary to oversee Coherent’s evolving business priorities.

Our fiscal 2026 achievements set the stage for an even more exciting chapter for Coherent. We entered the fiscal year with exceptional customer demand, expanding production and multiple new growth platforms expected to ramp over the coming quarters, supported by a powerful combination of technology leadership and manufacturing scale.

Coherent is helping shape the future of technology, and we are focused on translating this leadership into lasting value for our shareholders.

We are grateful for your continued investment and support.

Sincerely,

Enrico DiGirolamo

Chair of the Coherent Corp. Board of Directors

Table of Contents​

RECORD DATE: SEPTEMBER 21, 2026

Only shareholders of record as of the close of business on September 21, 2026 will be entitled to notice of and to vote at the Annual Meeting.

ATTENDANCE

Only shareholders of record or their legal proxies may participate in the virtual

Annual Meeting.

ITEMS OF BUSINESS

Shareholders are asked to vote on the following items at the Annual Meeting:

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Proposal 1: Election of four Class Three directors named in the proxy statement, each for a three-year term to expire in 2029.

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Proposal 2: A non-binding advisory vote to approve compensation paid to our named executive officers in fiscal year 2026, as disclosed in the proxy statement.

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Proposal 3: Ratification of the Audit and Risk Committee’s selection of Ernst &

Young LLP as our independent registered public accounting firm for the fiscal year

ending June 30, 2027.

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Such other business as may properly come before the Annual Meeting or any

postponement or adjournment thereof.

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VOTING

Every shareholder of record is entitled to cast one vote for every share of common stock held by them as of the close of business on September 21, 2026, on each of the items to be voted on at the Annual Meeting.

AVAILABILITY OF MATERIALS

Shareholders of record will automatically receive a printed set of proxy materials, including a proxy card. For shareholders who hold shares through a broker, bank or other nominee (commonly referred to as held in “street name”), we furnish proxy materials via the internet. If you received a Notice of Internet Availability of Proxy Materials (the “Notice”) by mail from your broker, bank or other nominee, you will not receive a printed copy of the proxy materials unless you request one. The Notice instructs you how to access and review all the important information contained in the proxy materials over the internet. The Notice also provides instructions for submitting your proxy over the internet. If you received a Notice and would like to receive a printed copy of our proxy materials, please follow the instructions for requesting materials included in the Notice.

This proxy statement and proxy card will first be made available to shareholders on or about October 9, 2026.

By Order of the Board

Rob Beard, Secretary

October 9, 2026