Dino Diperna - 20 Dec 2025 Form 4 Insider Report for CIENA CORP (CIEN)

Role: SVP Global R&D
Signature: By: Michelle Rankin For: Dino DiPerna
Issuer symbol: CIEN
Transactions as of: 20 Dec 2025
Net transactions value: -$1,695,072
Form type: 4
Filing time: 23 Dec 2025, 14:26:27 UTC
Previous filing: 18 Dec 2025
Next filing: 16 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
DiPerna Dino	SVP Global R&D	C/O CIENA CORPORATION, 7035 RIDGE RD., HANOVER	By: Michelle Rankin For: Dino DiPerna	22 Dec 2025	0001998460

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CIEN	Common Stock	Tax liability	$46,989	-204	-0.34%	$230.34	59,550	20 Dec 2025	Direct	F1, F2
transaction	CIEN	Common Stock	Tax liability	$102,271	-444	-0.75%	$230.34	59,106	20 Dec 2025	Direct	F2, F3
transaction	CIEN	Common Stock	Tax liability	$168,148	-730	-1.2%	$230.34	58,376	20 Dec 2025	Direct	F2, F4
transaction	CIEN	Common Stock	Tax liability	$98,586	-428	-0.73%	$230.34	57,948	20 Dec 2025	Direct	F2, F5
transaction	CIEN	Common Stock	Tax liability	$73,478	-319	-0.55%	$230.34	57,629	20 Dec 2025	Direct	F2, F6
transaction	CIEN	Common Stock	Tax liability	$410,696	-1,783	-3.1%	$230.34	55,846	20 Dec 2025	Direct	F2, F7
transaction	CIEN	Common Stock	Tax liability	$472,197	-2,050	-3.7%	$230.34	53,796	20 Dec 2025	Direct	F2, F7
transaction	CIEN	Common Stock	Tax liability	$322,706	-1,401	-2.6%	$230.34	52,395	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 10/27/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 10/31/2023.
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 12/13/2022. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 3 filed on 10/31/2023.
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 12/12/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/14/2023.
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 12/17/2024. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 12/19/2024.
F6	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 3 filed on 10/31/2023.
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.