Ciena Corporation (NYSE: CIEN) reports fiscal Q4 2025 results and posts investor presentation

Rhea-AI Filing Summary

Ciena Corporation reported that it has released financial results for its fiscal fourth quarter ended November 1, 2025. The company announced these results through a press release dated December 11, 2025, and will host an investor call to discuss its operations and financial performance for the quarter.

Ciena also posted an accompanying investor presentation on the quarterly results page of the Investors section of its website and furnished both the press release and the presentation as Exhibits 99.1 and 99.2. These materials, along with this current report’s results disclosure, are being treated as furnished rather than filed under federal securities laws, and Ciena highlights that it may from time to time post material information exclusively on its investor website.

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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): December 11, 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 2.02 Results of Operations and Financial Condition.

On December 11, 2025, Ciena Corporation ("Ciena") issued a press release announcing its financial results for its fiscal fourth quarter ended November 1, 2025. The text of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K (this "Report"). As discussed in the press release, Ciena will be hosting an investor call to discuss its results of operations for its fiscal fourth quarter ended November 1, 2025.

In conjunction with the issuance of this press release, Ciena posted to the quarterly results page of the "Investors" section of www.ciena.com an accompanying investor presentation. The investor presentation is furnished as Exhibit 99.2 to this Report.

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 December 11, 2025, issued by Ciena Corporation, reporting its results of operations for its fiscal fourth quarter ended November 1, 2025.
99.2			Investor Presentation for Ciena Corporation's fiscal fourth quarter ended November 1, 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: December 11, 2025			By:			/s/ Sheela Kosaraju
						Sheela Kosaraju
						Senior Vice President, General Counsel and Assistant Secretary

FAQ

What did Ciena Corporation (CIEN) announce in this 8-K filing?

Ciena Corporation announced that it issued a press release reporting its financial results for its fiscal fourth quarter ended November 1, 2025, and that it will host an investor call to discuss these results.

Where can investors find Ciena (CIEN) fourth quarter 2025 results and materials?

Investors can access Ciena’s press release (Exhibit 99.1) and investor presentation (Exhibit 99.2) through the quarterly results page of the Investors section of www.ciena.com.

How are Ciena’s Q4 2025 financial results materials treated under securities laws?

Ciena states that the information in Exhibits 99.1 and 99.2 and in Item 2.02 is being furnished, not filed, so it is not subject to the liability provisions of Section 18 of the Securities Exchange Act of 1934 and is not incorporated by reference into Securities Act registration statements.

What time period does Ciena’s newly reported quarter cover?

The reported quarter is Ciena’s fiscal fourth quarter ended November 1, 2025, as referenced in both the press release and the investor presentation.

What exhibits are included with Ciena Corporation’s Q4 2025 8-K?

The filing includes Exhibit 99.1 (text of the December 11, 2025 press release reporting fiscal fourth quarter results), Exhibit 99.2 (investor presentation for the fiscal fourth quarter ended November 1, 2025), and Exhibit 104 (cover page Inline XBRL data file).

Does Ciena (CIEN) indicate other channels where it may share material information?

Yes. Ciena encourages investors to review the Investors page of www.ciena.com, noting that it may from time to time post material information exclusively on that site.