Ciena Corp director sells 8,554 shares in insider transaction

CIENA CORP director T. Michael Nevens reported selling 8,554 shares of common stock on December 15, 2025 at $224.66 per share.

Rhea-AI Filing Summary

CIENA CORP director T. Michael Nevens reported selling 8,554 shares of common stock on December 15, 2025 at $224.66 per share.

After this transaction, he beneficially owned 9,422 shares, and the filing notes that this amount includes unvested restricted stock units. The report is filed by a single reporting person in his role as a director of the company.

Insider Trade Summary

Net Seller: 8,554 shares

Net Sell 1 txn

Insider NEVENS THOMAS MICHAEL

Role Director

Sold 8,554 shs ($1.92M)

Type	Security	Shares	Price	Value
Sale	Common Stock	8,554	$224.66	$1.92M

Holdings After Transaction: Common Stock — 9,422 shares (Direct)

Footnotes (1)

1. F1. Shares reported include unvested Restricted Stock Units (RSUs).

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider stock transaction did CIENA CORP (CIEN) disclose in this Form 4?

The filing reports that director T. Michael Nevens sold 8,554 shares of CIENA CORP common stock on December 15, 2025 at a price of $224.66 per share.

How many CIENA CORP (CIEN) shares does T. Michael Nevens own after the reported sale?

After the transaction, T. Michael Nevens beneficially owned 9,422 shares of CIENA CORP common stock.

Does the reported beneficial ownership for CIENA CORP (CIEN) include restricted stock units?

Yes. The filing explains that the 9,422 shares beneficially owned by T. Michael Nevens include unvested Restricted Stock Units (RSUs).

What is the reporting person's relationship to CIENA CORP (CIEN)?

The reporting person, T. Michael Nevens, is identified as a director of CIENA CORP.

When is the earliest transaction date reported in this CIENA CORP (CIEN) Form 4?

The earliest transaction date disclosed in the filing is December 15, 2025.

Is this CIENA CORP (CIEN) Form 4 filed by one or multiple reporting persons?

The document indicates that the Form 4 is filed by one reporting person, covering transactions for T. Michael Nevens.

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Accepted by SEC EDGAR 12/17/2025 - 02:45 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

NEVENS THOMAS MICHAEL

(Last) (First) (Middle)

C/O CIENA CORPORATION

7035 RIDGE RD.

(Street)

HANOVER MD 21076-1426

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
CIENA CORP [ CIEN ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

3. Date of Earliest Transaction (Month/Day/Year)
12/15/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
Common Stock	12/15/2025		S		8,554	D	$224.66	9,422(1)	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

1. Shares reported include unvested Restricted Stock Units (RSUs).

	By: Michelle Rankin For: T. Michael Nevens	12/15/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.