Gary B Smith - 20 Dec 2025 Form 4 Insider Report for CIENA CORP (CIEN)

Role: President, CEO, Director
Signature: By: Michelle Rankin For: Gary B Smith
Issuer symbol: CIEN
Transactions as of: 20 Dec 2025
Net transactions value: -$22,846,273
Form type: 4
Filing time: 23 Dec 2025, 14:43:02 UTC
Previous filing: 18 Dec 2025
Next filing: 29 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SMITH GARY B	President, CEO, Director	C/O CIENA CORPORATION, 7035 RIDGE RD., HANOVER	By: Michelle Rankin For: Gary B Smith	22 Dec 2025	0001032553

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CIEN	Common Stock	Tax liability	$687,565	-2,985	-0.6%	$230.34	494,437	20 Dec 2025	Direct	F1, F2
transaction	CIEN	Common Stock	Tax liability	$714,515	-3,102	-0.63%	$230.34	491,335	20 Dec 2025	Direct	F2, F3
transaction	CIEN	Common Stock	Tax liability	$401,483	-1,743	-0.35%	$230.34	489,592	20 Dec 2025	Direct	F2, F4
transaction	CIEN	Common Stock	Tax liability	$381,904	-1,658	-0.34%	$230.34	487,934	20 Dec 2025	Direct	F2, F5
transaction	CIEN	Common Stock	Tax liability	$13,198,712	-57,301	-12%	$230.34	430,633	20 Dec 2025	Direct	F2, F6
transaction	CIEN	Common Stock	Tax liability	$2,514,391	-10,916	-2.5%	$230.34	419,717	20 Dec 2025	Direct	F2, F7
transaction	CIEN	Common Stock	Tax liability	$2,890,076	-12,547	-3%	$230.34	407,170	20 Dec 2025	Direct	F2, F7
transaction	CIEN	Common Stock	Tax liability	$2,057,627	-8,933	-2.2%	$230.34	398,237	20 Dec 2025	Direct	F2, F8

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/13/2022. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/15/2022.
F2	Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
F3	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/12/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/14/2023.
F4	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/17/2024. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/19/2024.
F5	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a restricted stock unit (RSU) award agreement dated 12/14/2021. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/16/2021.
F6	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a market stock unit (MSU) award agreement dated 12/13/2022. The earning of the MSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025.
F7	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025.
F8	Represents shares withheld to cover payment of the tax liabilities of the reporting person related to a performance stock unit (PSU) award agreement dated 12/12/2023. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/19/2024.