Ciena (NYSE: CIEN) exec sells 2,500 shares under trading plan

Rhea-AI Filing Summary

CIENA CORP (CIEN) officer David M. Rothenstein, SVP and Chief Strategy Officer, reported a sale of 2,500 shares of common stock on 2026-08-14 at $438.10 per share in an open-market or private transaction. The sale was effected pursuant to a Rule 10b5-1 trading plan dated 10/10/2025. Following this transaction, he directly holds 180,231 shares, which include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).

Insider Trade Summary 10b5-1

Net Seller: 2,500 shares

Net Sell 1 txn

Insider Rothenstein David M

Role SVP and Chief Strategy Officer

Sold 2,500 shs ($1.10M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,500	$438.10	$1.10M

Holdings After Transaction: Common Stock — 180,231 shares (Direct)

Footnotes (2)

1. F1. Sales were affected pursuant to Rule 10b5-1 trading plan dated 10/10/2025.
2. F2. Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).

Key Figures

Shares sold: 2,500 shares Sale price: $438.10 per share Shares owned after transaction: 180,231 shares +2 more

5 metrics

Shares sold 2,500 shares Common Stock sale on 2026-08-14 by David M. Rothenstein

Sale price $438.10 per share Reported price for the 2,500 CIEN shares sold

Shares owned after transaction 180,231 shares Direct holdings following the 2026-08-14 sale, including unvested RSUs and PSUs

Shares sold under 10b5-1 plan 2,500 shares Sales effected pursuant to Rule 10b5-1 trading plan dated 10/10/2025

Rule 10b5-1 plan date 10/10/2025 Date of the trading plan governing the reported sale

Key Terms

Rule 10b5-1 trading plan, Restricted Stock Units (RSUs), Performance Stock Units (PSUs)

3 terms

Rule 10b5-1 trading plan regulatory

"Sales were affected pursuant to Rule 10b5-1 trading plan dated 10/10/2025"

A Rule 10b5-1 trading plan is a pre-arranged schedule that allows company insiders to buy or sell stock at specific times, even if they have inside information. It helps prevent accusations of unfair trading by making these transactions look planned and transparent, rather than sneaky or illegal.

Restricted Stock Units (RSUs) financial

"Shares reported include unvested Restricted Stock Units (RSUs)"

Restricted stock units (RSUs) are a type of company promise to give employees shares of stock in the future, usually after certain conditions like working for a set time. They are like a gift promised today that you receive later, which can become valuable if the company's stock price goes up. RSUs matter because they are a way companies reward employees and can be a significant part of compensation.

Performance Stock Units (PSUs) financial

"Shares reported include unvested ... Performance Stock Units (PSUs)"

Performance stock units (PSUs) are a form of executive or employee pay that promise company shares only if pre-set performance goals are met over a defined period; think of them as a bonus paid in stock that arrives only when the company hits agreed targets. Investors watch PSUs because they affect the number of shares outstanding (dilution) and reveal how management’s pay is tied to financial or operational results, aligning incentives with shareholder outcomes.

FAQ

What insider transaction did CIEN executive David M. Rothenstein report?

David M. Rothenstein reported selling 2,500 CIENA CORP (CIEN) shares on 2026-08-14 at $438.10 per share. The transaction was a reported open-market or private sale under a Rule 10b5-1 trading plan dated 10/10/2025.

How many CIEN shares does David M. Rothenstein hold after this Form 4 sale?

After the reported sale, David M. Rothenstein directly holds 180,231 CIEN shares. This figure includes unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs), as disclosed in the filing footnotes.

At what price were the CIEN shares sold in David M. Rothenstein’s Form 4 filing?

The 2,500 CIEN shares were sold at a reported price of $438.10 per share. The transaction is described as a sale in open market or private transaction, executed pursuant to a Rule 10b5-1 trading plan.

Was David M. Rothenstein’s CIEN stock sale under a Rule 10b5-1 trading plan?

Yes. The filing states the sales were effected pursuant to a Rule 10b5-1 trading plan dated 10/10/2025. A 10b5-1 plan specifies pre-arranged trading instructions, reducing the significance of trade timing as an information signal.

Do David M. Rothenstein’s reported CIEN holdings include unvested equity awards?

Yes. The footnotes explain that the 180,231 CIEN shares reported after the transaction include unvested RSUs and PSUs. These awards may vest over time or upon performance conditions being met.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Form 4 Insider Transactions: What Each Field Means →

Available on EDGAR 08/18/2026 - 05:04 PM Accepted by SEC EDGAR 08/18/2026 - 05:03 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).

X

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^*

Rothenstein David M

(Last) (First) (Middle)

C/O CIENA CORPORATION

8150 MAPLE LAWN BOULEVARD, SUITE 300

(Street)

FULTON MARYLAND 20759

(City) (State) (Zip)

UNITED STATES

(Country)

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

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

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	SVP and Chief Strategy Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
08/14/2026

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

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

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

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	08/14/2026		S		2,500(1)	D	$438.1	180,231(2)	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. Sales were affected pursuant to Rule 10b5-1 trading plan dated 10/10/2025.

2. Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).

	By: Michelle Rankin For: DAVID ROTHENSTEIN	08/17/2026
	** 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.
* Form 4: SEC 1474 (03-26)