Ciena CFO sells 4,995 shares at $430.7178

CIENA CORP (CIEN) reported that its SVP & Chief Financial Officer, Marc D. Graff, sold 4,995 shares of common stock on 2026-08-14 in an open-market transaction under a Rule 10b5-1 trading plan.

Rhea-AI Filing Summary

CIENA CORP (CIEN) reported that its SVP & Chief Financial Officer, Marc D. Graff, sold 4,995 shares of common stock on 2026-08-14 in an open-market transaction under a Rule 10b5-1 trading plan. The weighted average sale price was $430.7178 per share, within a range of $423.35 to $443.41, leaving him with 107,519 shares directly owned, including unvested RSUs.

Insider Trade Summary 10b5-1

Net Seller: 4,995 shares

Net Sell 1 txn

Insider Graff Marc D.

Role SVP & Chief Financial Officer

Sold 4,995 shs ($2.15M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2, F3	4,995	$430.7178	$2.15M

Holdings After Transaction: Common Stock — 107,519 shares (Direct)

Footnotes (3)

1. F1. Sales were affected pursuant to Rule 10b5-1 trading plan dated 08/14/2026.
2. F2. Reflects the weighted average sales price with transactions in a range of sales from $423.3500 to $443.4100. Upon request by the SEC, full information regarding the number of shares sold at each separate sales price will be provided.
3. F3. Shares reported include unvested Restricted Stock Units (RSUs)

Key Figures

Shares sold: 4,995 shares Weighted average sale price: $430.7178 per share Sale price range: $423.3500 to $443.4100 +3 more

6 metrics

Shares sold 4,995 shares Common stock sold by Marc D. Graff on 2026-08-14

Weighted average sale price $430.7178 per share Average price for the reported sale transaction

Sale price range $423.3500 to $443.4100 Range of prices at which shares were sold

Shares held after transaction 107,519 shares Direct holdings by Marc D. Graff after the sale, including unvested RSUs

Sell transaction count 1 Number of sell transactions reported in this Form 4

Net shares sold 4,995 shares Net buy/sell shares in the transaction summary (net-sell)

Key Terms

Rule 10b5-1 trading plan, Restricted Stock Units (RSUs), weighted average sales price

3 terms

Rule 10b5-1 trading plan regulatory

"Sales were affected pursuant to Rule 10b5-1 trading plan dated 08/14/2026."

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.

weighted average sales price financial

"Reflects the weighted average sales price with transactions in a range of sales"

FAQ

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

What insider transaction did CIEN report for Marc D. Graff?

Marc D. Graff, CIENA CORP’s SVP & CFO, sold 4,995 shares of common stock on 2026-08-14. The sale was reported as an open-market transaction under a Rule 10b5-1 trading plan with a disclosed weighted average price.

At what price were the CIEN shares sold by Marc D. Graff?

The reported weighted average sale price was $430.7178 per share. Footnotes state trades occurred in a price range from $423.3500 to $443.4100, and detailed trade breakdowns are available to the SEC upon request.

How many CIEN shares does Marc D. Graff hold after this sale?

After the reported sale, Marc D. Graff directly holds 107,519 CIEN shares. A footnote clarifies that this figure includes unvested Restricted Stock Units (RSUs) in addition to any vested or previously owned common shares.

Was the CIEN insider sale by Marc D. Graff under a Rule 10b5-1 plan?

Yes, the filing affirms that the transactions were under a Rule 10b5-1 trading plan. A footnote specifies the plan was dated 08/14/2026, indicating the sales followed a pre-established trading arrangement.

How many sell transactions were reported in this CIEN Form 4?

The insider Form 4 for CIENA CORP reports one sell transaction for Marc D. Graff. In total, 4,995 shares were sold, and the transaction summary shows a net-sell direction of 4,995 shares for this filing.

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

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Accepted by SEC EDGAR 08/18/2026 - 06:30 PM EDT 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^*

Graff Marc D.

(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 & Chief Financial 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		4,995(1)	D	$430.7178(2)	107,519(3)	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 08/14/2026.

2. Reflects the weighted average sales price with transactions in a range of sales from $423.3500 to $443.4100. Upon request by the SEC, full information regarding the number of shares sold at each separate sales price will be provided.

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

	By: Michelle Rankin For: Marc D. Graff	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)