Ciena officer plans $799K Rule 144 share sale

Rhea-AI Filing Summary

Ciena Corporation (CIEN) officer David Rothenstein filed a notice of proposed sale under Rule 144 for 2,500 shares of common stock, to be sold through Morgan Stanley Smith Barney with an aggregate market value of $799,100.00, and a noted issuer share count of 141,808,525.

The shares derive from restricted stock units that vested between March 20, 2021 and September 20, 2024, and the filing lists additional 10b5-1 sales of 2,500 shares on July 15, 2026 for $1,052,284.25 and 2,500 shares on August 14, 2026 for $1,095,250.00.

Key Figures

Proposed shares to be sold: 2,500 shares Aggregate market value of proposed sale: $799,100.00 Shares or units outstanding: 141,808,525 shares +4 more

7 metrics

Proposed shares to be sold 2,500 shares Common stock covered by the Rule 144 notice

Aggregate market value of proposed sale $799,100.00 Estimated value of 2,500 CIEN shares to be sold

Shares or units outstanding 141,808,525 shares Reported issuer share count in the Form 144

10b5-1 sale on August 14, 2026 2,500 shares for $1,095,250.00 Common stock sale disclosed for the past three months

10b5-1 sale on July 15, 2026 2,500 shares for $1,052,284.25 Common stock sale disclosed for the past three months

RSU vesting period March 20, 2021 to September 20, 2024 Period when RSUs that generated the shares vested

Date of proposed sale September 15, 2026 Date listed for the proposed Rule 144 transaction on the NYSE

Key Terms

Rule 144, Restricted Stock Units, 10b5-1, Securities to be sold, +1 more

5 terms

Rule 144 regulatory

"See the definition of "person" in paragraph (a) of Rule 144."

Rule 144 is a U.S. securities regulation that sets conditions under which restricted or insider-held shares can be legally resold to the public, such as required holding periods, availability of public information, limits on how much can be sold at once, and certain filing requirements. For investors it matters because it determines when previously locked-up shares can enter the market — like a release valve that can increase supply, affect share price, and signal insider intent.

Restricted Stock Units financial

"Restricted Stock Units | Issuer | | | 2500 | 03/20/2021 |"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

10b5-1 regulatory

"10b5-1 Sales for DAVID ROTHENSTEIN 8150 Maple Lawn Blvd"

A 10b5-1 plan is a pre-set schedule that lets company insiders buy or sell shares according to written instructions made when they do not possess material, nonpublic information. Think of it as a timed automatic payment for stock trades: it helps insiders avoid accusations of trading on secret information and gives outside investors a clearer signal about whether sales are routine or potentially informative about the company’s prospects.

Securities to be sold financial

"144: Securities To Be Sold Common | 03/20/2021 |"

Aggregate market value financial

"| Common | Morgan Stanley Smith Barney LLC Executive Financial Services | 2500 | 799100.00 |"

Aggregate market value is the combined price you would pay to buy all outstanding shares of a company or all companies in a group at current market prices — essentially the sum of each stock’s market capitalization. It matters to investors because it shows the overall size and weight of an investment or sector (like the total cost to buy every piece of a puzzle), helps compare scale across companies or markets, and influences index composition and risk exposure.

FAQ

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

How many CIEN shares does David Rothenstein plan to sell under this Form 144?

The notice covers a proposed sale of 2,500 shares of Ciena Corporation common stock with an aggregate market value of $799,100.00, to be sold through Morgan Stanley Smith Barney under Rule 144.

What is the reported share count for CIEN in this Form 144 filing?

The filing reports 141,808,525 Ciena Corporation common shares in the field for shares or other units outstanding, providing context for the proposed Rule 144 sale of 2,500 shares.

What prior 10b5-1 sales of CIEN stock by David Rothenstein are disclosed?

The notice lists 10b5-1 sales of 2,500 shares of CIEN common stock on July 15, 2026 for $1,052,284.25 and 2,500 shares on August 14, 2026 for $1,095,250.00.

How were the CIEN shares in this Form 144 acquired?

The securities to be sold were acquired upon the vesting of restricted stock units during the period from March 20, 2021 through September 20, 2024, as stated in the remarks section.

Which broker is named for the proposed CIEN share sale in this Form 144?

The proposed sale of 2,500 CIEN shares is indicated to be executed through Morgan Stanley Smith Barney LLC Executive Financial Services at One New York Plaza, New York.

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

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Available on EDGAR 09/15/2026 - 04:33 PM Accepted by SEC EDGAR 09/15/2026 - 04:32 PM Learn about SEC filing dates

Form 144 Filer Information	UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 144 NOTICE OF PROPOSED SALE OF SECURITIES PURSUANT TO RULE 144 UNDER THE SECURITIES ACT OF 1933
FORM 144

144: Filer Information

Filer CIK	0001444157
Filer CCC	XXXXXXXX
Is this a LIVE or TEST Filing?	LIVE TEST
Submission Contact Information
Name
Phone
E-Mail Address

144: Issuer Information

Name of Issuer	Ciena Corporation
SEC File Number	001-36250
Address of Issuer	8150 Maple Lawn Blvd, Suite 300, Fulton MARYLAND 20759
Phone	4106945700
Name of Person for Whose Account the Securities are To Be Sold	DAVID ROTHENSTEIN
See the definition of "person" in paragraph (a) of Rule 144. Information is to be given not only as to the person for whose account the securities are to be sold but also as to all other persons included in that definition. In addition, information shall be given as to sales by all persons whose sales are required by paragraph (e) of Rule 144 to be aggregated with sales for the account of the person filing this notice.
Relationship to Issuer	Officer

144: Securities Information

Title of the Class of Securities To Be Sold	Name and Address of the Broker	Number of Shares or Other Units To Be Sold	Aggregate Market Value	Number of Shares or Other Units Outstanding	Approximate Date of Sale	Name the Securities Exchange
Common	Morgan Stanley Smith Barney LLC Executive Financial Services 1 New York Plaza 8th Floor New York NY 10004	2500	799100.00	141808525	09/15/2026	NYSE

Furnish the following information with respect to the acquisition of the securities to be sold and with respect to the payment of all or any part of the purchase price or other consideration therefor:

144: Securities To Be Sold

Title of the Class	Date you Acquired	Nature of Acquisition Transaction	Name of Person from Whom Acquired	Is this a Gift?	Date Donor Acquired	Amount of Securities Acquired	Date of Payment	Nature of Payment *
Common	03/20/2021	Restricted Stock Units	Issuer			2500	03/20/2021	N/A

* If the securities were purchased and full payment therefor was not made in cash at the time of purchase, explain in the table or in a note thereto the nature of the consideration given. If the consideration consisted of any note or other obligation, or if payment was made in installments describe the arrangement and state when the note or other obligation was discharged in full or the last installment paid.

Furnish the following information as to all securities of the issuer sold during the past 3 months by the person for whose account the securities are to be sold.

144: Securities Sold During The Past 3 Months

Name and Address of Seller	Title of Securities Sold	Date of Sale	Amount of Securities Sold	Gross Proceeds
10b5-1 Sales for DAVID ROTHENSTEIN 8150 Maple Lawn Blvd, Suite 300, Fulton MD 20759	Common	08/14/2026	2500	1095250.00
10b5-1 Sales for DAVID ROTHENSTEIN 8150 Maple Lawn Blvd, Suite 300, Fulton MD 20759	Common	07/15/2026	2500	1052284.25

144: Remarks and Signature

Remarks	The securities to be sold were acquired upon the vesting of restricted stock units during the period of 3/20/2021 through 9/20/2024.
Date of Notice	09/15/2026
Date of Plan Adoption or Giving of Instruction, If Relying on Rule 10b5-1	10/10/2025
ATTENTION:
The person for whose account the securities to which this notice relates are to be sold hereby represents by signing this notice that he does not know any material adverse information in regard to the current and prospective operations of the Issuer of the securities to be sold which has not been publicly disclosed. If such person has adopted a written trading plan or given trading instructions to satisfy Rule 10b5-1 under the Exchange Act, by signing the form and indicating the date that the plan was adopted or the instruction given, that person makes such representation as of the plan adoption or instruction date.
Signature	/s/ David Rothenstein
ATTENTION: Intentional misstatements or omission of facts constitute Federal Criminal Violations (See 18 U.S.C. 1001)