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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d)

of the Securities Exchange Act of 1934

Date of Report (Date of earliest event ~~reported~~Reported): ~~November 20~~December 16, 2025

Coherent Corp.

(Exact ~~name~~Name of ~~registrant~~Registrant as ~~specified~~Specified in ~~its charter~~Charter)

Pennsylvania

~~001-39375~~

~~25-1214948~~

001-39375

25-1214948

(State or Other Jurisdiction of Incorporation)

(Commission File Number)

(I.R.S. Employer Identification No.)

(State or Other Jurisdictionof Incorporation)

(CommissionFile Number)

(I.R.S. EmployerIdentification Number)

375 Saxonburg Boulevard,

Saxonburg, Pennsylvania 16056

(Address of Principal Executive ~~Offices~~Office) (Zip Code)

(724) 352-4455

(Registrant’'s telephone number, including area code)

Not Applicable

(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:

Title of each class ~~Trading Symbol~~TradingSymbol(s) Name of each exchange on which registered Common Stock, no par value COHR New York Stock Exchange

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. ☐

Item 8.01. Other Events.

OnAs ~~November 20,~~previously ~~2025,~~disclosed ~~Coherent~~in ~~Corp. (the “Company”) entered into~~ a ~~Waiver~~Current ~~Agreement~~Report ~~(the~~on ~~“Waiver~~Form ~~Agreement”) with Bain Capital, as holder of the Company’s Series B~~10-1K ~~Convertible~~dated ~~Preferred~~August ~~Stock~~15, no2025, ~~par~~effective ~~value~~with ~~per share (~~the ~~“Series~~beginning ~~B-1~~of ~~Preferred~~its ~~Stock”)~~2026 ~~and~~fiscal ~~Series~~year ~~B-2~~on ~~Convertible~~July ~~Preferred~~1, ~~Stock~~2025, noCoherent ~~par~~Corp. ~~value per share~~ (~~together with~~ the ~~Series B-1 Preferred Stock, the~~ “~~Series B Preferred Stock~~Company”), ~~whereby~~began ~~the~~operating ~~holder~~under ~~irrevocably~~two ~~and~~revised ~~unconditionally~~business ~~waived~~segments: ~~all~~Datacenter ~~and~~& ~~any~~Communications; ~~rights~~and ~~held~~Industrial. byThe ~~such~~Company’s ~~holder~~businesses toare ~~receive~~organized ~~dividends~~and onmanaged ~~any~~under ortwo ~~all~~segments ~~shares~~based ~~of the Series B Preferred Stock~~ on orsimilarities ~~after the date thereof, pursuant to the terms set forth~~ in ~~the~~products ~~Company’s~~and ~~Statement with Respect to Shares for the Series B Preferred Stock~~services.

~~While~~The ~~Bain~~Company ~~Capital~~is ~~has~~filing ~~sold~~information aunder ~~portion~~Item 8.01 of ~~its~~this ~~holdings~~Current ~~and~~Report ~~made~~on ~~charitable~~Form ~~distributions,~~8-K it(this ~~retains~~“Form a8-K”) ~~substantial~~to ~~ownership~~(i) ~~position~~provide ininvestors ~~Coherent.~~with ~~The~~recast ~~mutually~~historical ~~agreed~~financial ~~upon~~information ~~Waiver~~for ~~Agreement~~periods ~~underscores~~prior ~~Bain~~to ~~Capital’s~~the ~~commitment~~segment tochange, ~~support~~and (ii) incorporate by reference that recast historical financial information into the Company’s ~~strategic~~filings ~~priorities~~with the Securities and ~~further~~Exchange ~~aligns~~Commission, ~~Bain~~including ~~Capital’s~~registration ~~interests~~statements ~~with~~filed ~~those~~under the Securities Act of ~~common~~1933, ~~shareholders.~~as amended.

~~Steve~~The ~~Pagliuca,~~following ~~Senior~~items ~~Advisor~~from ~~and~~the ~~former~~Company’s ~~Co-Chairman~~Annual ofReport ~~Bain~~on ~~Capital~~Form ~~stated,~~10-K ~~“Coherent~~for ~~represents~~the afiscal ~~compelling~~year ~~long-term~~ended ~~investment~~June ~~opportunity~~30, ~~supported~~2025 by(the ~~strong~~“2025 ~~fundamentals,~~Form a10-K”) ~~clear~~are ~~strategic~~being ~~vision~~revised and anupdated ~~industry~~from ~~leading~~their ~~management~~previous ~~team.~~presentation Wesolely ~~are~~to ~~proud~~reflect ofthe ~~our~~Company’s ~~partnership~~new ~~with~~segment ~~the~~structure, ~~Company~~as ~~and~~reflected ~~excited~~in ~~about~~Exhibit ~~its outlook~~99.”1 to this Form 8-K:

~~Coherent~~•Part ~~views~~I, ~~this~~Item ~~agreement as a positive development that underscores a shared commitment to its success and strengthens alignment between the Company and one of its largest shareholders~~1. Business;

2•Part II, Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations; and

•Part II, Item 8. Financial Statements and Supplementary Data.

Except for minor, non-substantive revisions, only the following notes to the consolidated financial statements have been revised from their previous presentation:

•Note 1 - Nature of Business and Summary of Significant Accounting Policies;

•Note 3 - Revenue from Contracts with Customers;

•Note 6 - Goodwill and Other Intangible Assets;

•Note 14 - Segment and Geographic Reporting;

•Note 20 - Restructuring Plans; and

•Note 21 - Assets Held-for-Sale.

The changes referred to above had no impact on the Company’s historical consolidated financial position, results of operations or cash flows, and the recast financial information contained in Exhibit 99.1 to this Form 8-K does not represent a restatement of previously issued financial statements.

Also included in Exhibit 99.1 is the report of Ernst & Young LLP, our independent registered public accounting firm, on the consolidated financial statements, which is unchanged from the report included in the 2025 Form 10-K, other than the dual date to include the recast and reissuance of the consolidated financial statement footnote information.

This Form 8-K does not modify or update other 2025 Form 10-K information in any way, nor does it reflect any subsequent information or events, other than as required to reflect the change in segments as described above.

The information in this Form 8-K, including Exhibit 99.1, should be read in conjunction with the 2025 Form 10-K and any other documents filed by the Company pursuant to the Securities Exchange Act of 1934, as amended, subsequent to August 15, 2025, which are incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d)Exhibits


23.01			Consent of Ernst & Young, LLP.

99.1			Revised Part I, Item 1. "Business," Part II, Item 7. "Management's Discussion and Analysis of Financial Condition and Results of Operations," and Part II, Item 8. "Financial Statements and Supplementary Data" of Coherent Corp.'s Annual Report on Form 10-K for the year ended June 30, 2025.

104			Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURE

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.

	Coherent Corp.	~~Coherent Corp.~~
		By:	/s/ Rob Beard
Date: December 16, 2025	By:		/s/ Sherri Luther
		Name:	Rob Beard
			Sherri Luther
		Title:	Chief Legal and Global Affairs Officer
			Chief Financial Officer and Treasurer
Date: November 20, 2025

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