UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, DC 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): September 422, 2025

Ciena Corporation

(Exact name of registrant as specified in its charter)

Commission File Number: 001-36250

Delaware

(State or other jurisdiction of incorporation)

7035 Ridge Road, Hanover, MD

(Address of principal executive offices)

23-2725311

(IRS Employer Identification No.)

21076

(Zip Code)

Registrant's telephone number, including area code: (410) 694-5700

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 (see General Instruction A.2. below):
☐			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(s)	Name of each exchange on which registered
Common stock, $0.01 par value	CIEN	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 28.0201 ~~Results~~– ofOTHER ~~Operations and Financial Condition.~~EVENTS

On September 422, 2025, Ciena Corporation ("Ciena") issued a press release announcing ~~its~~that ~~financial~~it ~~results~~has ~~for~~entered ~~its~~into ~~fiscal~~a ~~third~~definitive ~~quarter~~agreement ~~ended~~to ~~August~~acquire 2privately-held Nubis Communications, ~~2025~~Inc., ~~The~~which ~~text~~specializes ofin ~~the~~high-performance, ~~press~~ultra-compact, ~~release~~low-power isoptical ~~furnished~~and aselectrical ~~Exhibit~~interconnects ~~99.1~~tailored to ~~this~~support ~~Current~~artificial ~~Report~~intelligence ~~on Form 8-K~~ (~~this "Report"~~AI) workloads. AsThe ~~discussed~~transaction inis ~~the~~expected ~~press~~to ~~release,~~close during Ciena’s ~~will~~fiscal befourth ~~hosting~~quarter an2025 ~~investor~~and ~~call~~is subject to ~~discuss~~customary ~~its~~closing ~~results~~conditions. A copy of ~~operations~~the ~~for~~press ~~its~~release ~~fiscal~~is ~~third~~attached ~~quarter~~hereto ~~ended~~as ~~August,~~Exhibit 2,99.1 ~~2025~~and incorporated by reference herein.

InThis ~~conjunction~~Current ~~with~~Report on Form 8-K contains forward-looking statements that are based on management’s current expectations, forecasts, information and assumptions. These statements involve inherent risks and uncertainties. Actual results or outcomes may differ materially from those stated or implied in the ~~issuance~~forward-looking statements because of ~~this~~risks ~~press~~and ~~release~~uncertainties, ~~Ciena~~including ~~posted~~the torisks that the acquisition may not close when expected, or at all, that problems may arise in successfully integrating the acquired business, that the acquisition may fail to achieve its expected benefits, and those risks and uncertainties detailed in Ciena’s most recent annual and quarterly ~~results~~reports ~~page~~filed ofwith the Securities and Exchange Commission. Forward-looking statements include statements regarding Ciena's expectations, beliefs, intentions or strategies, and can be identified by words such as "~~Investors~~anticipate," ~~section~~"believe," of"could," ~~www.ciena.com an~~"estimate," ~~accompanying~~"expect," ~~investor~~"intend," ~~presentation~~"may," and "will," and similar words and expressions. ~~The~~Ciena ~~investor~~assumes ~~presentation~~no isobligation ~~furnished~~to update any forward-looking statement, whether as ~~Exhibit~~a ~~99.2~~result of new information, future events or otherwise, except to ~~this~~the ~~Report~~extent required by law.

The information in Exhibits 99.1 and 99.2, as well as Item 2.02 of this Report, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liabilities of that section, and shall not be incorporated by reference into any registration statement pursuant to the Securities Act of 1933, as amended. Investors are encouraged to review the “Investors” page of our website at www.ciena.com because, as with the other disclosure channels that we use, from time to time we may post material information exclusively on that site.

Item 9.01 Financial Statements and Exhibits.

Exhibit Number			Description of Document
99.1			Text of Press Release dated September 422, 2025~~, issued by Ciena Corporation, reporting its results of operations for its fiscal third quarter ended August 2, 2025~~.
99.2			Investor Presentation for Ciena Corporation's fiscal third quarter ended August 2, 2025.
104			Cover Page Interactive Data File (embedded within the Inline XBRL document).

SIGNATURES


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 thereunto duly authorized.

	Ciena Corporation
Date: September 4, 2025	By:	/s/ Sheela Kosaraju
Date: September 22, 2025	By:	/s/ Sheela Kosaraju
		Sheela Kosaraju
		Senior Vice President, General Counsel and Assistant Secretary

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