Ciena director's trust contributes 2,857 shares

The contributed stock was valued at $355.91 per share to determine the size of the exchange-fund interest to be issued.

Rhea-AI Filing Summary

Bruce L. Claflin reported sale transactions in this Form 4 filing. Ciena Corp. director Bruce L. Claflin reported that a spousal trust contributed 2,857 common shares to an exchange fund on September 24, 2026, in exchange for an interest. The shares were valued at $355.91 each to determine the size of the interest; the trust reported 8,279 shares afterward. Claflin disclaims beneficial ownership of the trust’s securities. His direct holdings were 50,843 shares, including unvested RSUs. No Rule 10b5-1 plan is reported.

Insider Trade Summary

Net Seller: 2,857 shares

Net Sell 2 txns

Insider Claflin Bruce L.

Role Director

Sold 2,857 shs ($1.02M)

Type	Security	Shares	Price	Value
Sale	Common Stock F1, F2	2,857	$355.91	$1.02M
holding	Common Stock F3	--	--	--

Holdings After Transaction: Common Stock — 8,279 shares (Indirect, By spousal trust); Common Stock — 50,843 shares (Direct)

Footnotes (3)

1. F1. Reflects a contribution of common stock to an exchange fund in exchange for an interest in the exchange fund. The common stock was valued at $355.91 per share for the purpose of determining the size of the interest in the exchange fund to be issued
2. F2. The beneficiaries of the trust are the reporting person's spouse and children. The reporting person disclaims beneficial ownership of the securities held by the trust.
3. F3. Shares reported include unvested Restricted Stock Units (RSUs).

Key Figures

Common shares contributed: 2,857 shares Share value for sizing exchange-fund interest: $355.91 per share Trust shares following transaction: 8,279 shares +1 more

4 metrics

Common shares contributed 2,857 shares Contributed to an exchange fund on September 24, 2026

Share value for sizing exchange-fund interest $355.91 per share Used to determine the size of the interest to be issued

Trust shares following transaction 8,279 shares Indirect holdings through a spousal trust

Direct shares following transaction 50,843 shares Includes unvested Restricted Stock Units

Key Terms

exchange fund, Restricted Stock Units (RSUs), beneficial ownership

3 terms

exchange fund financial

"contribution of common stock to an exchange fund"

An exchange fund is a pooled investment vehicle where holders of a single, highly appreciated stock swap their shares for pro rata interests in a diversified basket, allowing them to reduce concentration risk without immediately selling and triggering a large capital gains tax. It matters to investors because it provides instant diversification and potential tax deferral—like trading one oversized slice of pie for many smaller slices—though it usually carries fees, a multi‑year lockup and less control over exact timing of liquidity.

Restricted Stock Units (RSUs) financial

"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.

beneficial ownership financial

"disclaims beneficial ownership of the securities held by the trust"

Beneficial ownership means the person or entity that actually enjoys the benefits of owning shares or other assets — such as receiving dividends, voting rights, or price gains — even if the legal title is held in another name. For investors it matters because knowing who truly controls and profits from a company reveals who can influence decisions, exposes potential conflicts of interest or hidden concentration of power, and affects transparency and risk in the stock.

FAQ

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

How many CIEN shares did Bruce L. Claflin’s spousal trust contribute?

The trust contributed 2,857 common shares to an exchange fund on September 24, 2026, in exchange for an interest. It reported 8,279 shares afterward.

What did the $355.91 CIEN share value represent?

The common stock was valued at $355.91 per share to determine the size of the interest in the exchange fund to be issued.

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

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Available on EDGAR 09/28/2026 - 05:53 PM Accepted by SEC EDGAR 09/28/2026 - 05:53 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^*

Claflin Bruce L.

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/24/2026

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	09/24/2026		S(1)		2,857	D	$355.91	8,279	I	By spousal trust(2)
Common Stock								50,843(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. Reflects a contribution of common stock to an exchange fund in exchange for an interest in the exchange fund. The common stock was valued at $355.91 per share for the purpose of determining the size of the interest in the exchange fund to be issued

2. The beneficiaries of the trust are the reporting person's spouse and children. The reporting person disclaims beneficial ownership of the securities held by the trust.

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

	By: Michele Rankin For: Bruce L. Claflin	09/28/2026
	** 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)