=== SEC Form 4 — Statement of Changes in Beneficial Ownership ===
Document Type: 4
Period of Report: 2025-12-20
10b5-1 Pre-arranged Plan: No
--- Issuer ---
Name: CIENA CORP (CIEN)
CIK: 0000936395
--- Reporting Owner ---
Name: Cumello Joseph
CIK: 0001963638
Role: Officer (SVP, General Mgr. Blue Planet)
--- Non-Derivative Transactions ---
[Transaction #1]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -441 | Price: $230.34
Total Value: $101,579.94
Shares Owned After: 72,501 | Ownership: D (Direct)
Footnotes:
[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 3 filed on 2/3/2023.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #2]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -182 | Price: $230.34
Total Value: $41,921.88
Shares Owned After: 72,319 | Ownership: D (Direct)
Footnotes:
[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 2/1/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 2/3/2023.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #3]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -582 | Price: $230.34
Total Value: $134,057.88
Shares Owned After: 71,737 | Ownership: D (Direct)
Footnotes:
[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.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #4]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -332 | Price: $230.34
Total Value: $76,472.88
Shares Owned After: 71,405 | Ownership: D (Direct)
Footnotes:
[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.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #5]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -269 | Price: $230.34
Total Value: $61,961.46
Shares Owned After: 71,136 | Ownership: D (Direct)
Footnotes:
[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 2/3/2023.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #6]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -5,644 | Price: $230.34
Total Value: $1,300,038.96
Shares Owned After: 65,492 | Ownership: D (Direct)
Footnotes:
[F7] 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.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #7]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -1,382 | Price: $230.34
Total Value: $318,329.88
Shares Owned After: 64,110 | Ownership: D (Direct)
Footnotes:
[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 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #8]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -1,589 | Price: $230.34
Total Value: $366,010.26
Shares Owned After: 62,521 | Ownership: D (Direct)
Footnotes:
[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 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
[Transaction #9]
Security: Common Stock
Date: 2025-12-20 | Code: F (Payment of exercise/tax)
Shares: -1,117 | Price: $230.34
Total Value: $257,289.78
Shares Owned After: 61,404 | Ownership: D (Direct)
Footnotes:
[F9] 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.
[F2] Shares reported include unvested Restricted Stock Units (RSUs) and Performance Stock Units (PSUs).
--- Footnotes (Complete Index) ---
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 3 filed on 2/3/2023.
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 2/1/2023. Acquisition of the RSU was previously reported in Table I of the reporting person's Form 4 filed on 2/3/2023.
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 2/3/2023.
F7: 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.
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 12/17/2024. The earning of the PSU was previously reported on Table I of the reporting person's Form 4 filed on 12/18/2025.
F9: 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.
--- Signature ---
/s/ By: Michelle Rankin For: Joseph Cumello (2025-12-22)
