Ciena Corporation
US ˙ NYSE ˙ US1717793095

SecurityCIEN / Ciena Corporation
InstitutionMackenzie Financial Corp
Latest Disclosed Ownership16,893 shares
Latest Disclosed Value $ 6,558,369
Mackenzie Financial Corp reports 68.39% increase in ownership of CIEN / Ciena Corporation

On May 13, 2026 - Mackenzie Financial Corp filed a 13F-HR form disclosing ownership of 16,893 shares of Ciena Corporation (US:CIEN) valued at $6,558,369 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 18, 2026 disclosing 10,032 shares of Ciena Corporation. This represents a change in shares of 68.39% during the quarter. The current value of the position is $9,048,398 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F CIENA COM NEW 171779309 16,893 6,861 68.39 6,558 174.85 0.0079
2026-02-18 2025-12-31 13F CIENA COM NEW 171779309 10,032 -1,208 -10.75 2,387 45.75 0.0028
2025-11-13 2025-09-30 13F CIENA COM NEW 171779309 11,240 3,369 42.80 1,637 155.78 0.0020
2025-08-13 2025-06-30 13F CIENA COM NEW 171779309 7,871 0 0.00 640 34.74 0.0008
2025-05-07 2025-03-31 13F CIENA COM NEW 171779309 7,871 0 0.00 476 -28.79 0.0007
2025-05-02 2024-12-31 13F/A-2 CIENA COM NEW 171779309 7,871 -1,133 -12.58 668 20.40 0.0009
2025-02-20 2024-12-31 13F/A-1 CIENA COM NEW 171779309 7,871 -1,133 668 0.0009
2025-02-14 2024-12-31 13F Ciena Common Stock 171779309 7,871 -1,133 661 0.0009
2024-11-13 2024-09-30 13F CIENA COM NEW 171779309 9,004 -41,058 -82.01 555 -77.02 0.0008
2024-08-14 2024-06-30 13F CIENA COM NEW 171779309 50,062 41,580 490.21 2,412 475.42 0.0036
2024-05-10 2024-03-31 13F CIENA COM NEW 171779309 8,482 2,713 47.03 419 61.78 0.0006
2024-01-30 2023-12-31 13F CIENA COM NEW 171779309 5,769 5,769 260 0.0004
2023-08-03 2023-06-30 13F CIENA COM NEW 171779309 0 -57,938 -100.00 0 -100.00
2023-04-24 2023-03-31 13F CIENA COM NEW 171779309 57,938 53,524 1,212.60 3,043 1,252.00 0.0047
2023-02-14 2022-12-31 13F CIENA COM NEW 171779309 4,414 4,414 225 0.0004
2022-10-07 2022-09-30 13F CIENA COM NEW 171779309 0 -6,331 -100.00 0 -100.00
2022-08-10 2022-06-30 13F CIENA COM NEW 171779309 6,331 -4,084 -39.21 289 -54.20 0.0005
2022-05-13 2022-03-31 13F CIENA COM NEW 171779309 10,415 1,700 19.51 631 -5.96 0.0008
2022-02-14 2021-12-31 13F CIENA COM NEW 171779309 8,715 499 6.07 671 59.00 0.0009
2021-11-08 2021-09-30 13F CIENA COM NEW 171779309 8,216 -51 -0.62 422 -10.21 0.0006
2021-08-11 2021-06-30 13F CIENA COM NEW 171779309 8,267 -1,049 -11.26 470 -7.84 0.0007
2021-05-14 2021-03-31 13F CIENA COM NEW 171779309 9,316 98 1.06 510 4.72 0.0008
2021-02-10 2020-12-31 13F CIENA COM NEW 171779309 9,218 -2,563 -21.76 487 4.06 0.0011
2020-11-13 2020-09-30 13F CIENA COM NEW 171779309 11,781 -302 -2.50 468 -28.44 0.0012
2020-08-13 2020-06-30 13F CIENA COM NEW 171779309 12,083 -1,068 -8.12 654 24.81 0.0018
2020-05-14 2020-03-31 13F CIENA COM NEW 171779309 13,151 -6,484 -33.02 524 -37.47 0.0017
2020-02-13 2019-12-31 13F CIENA COM NEW 171779309 19,635 -107,583 -84.57 838 -83.21 0.0021
2019-11-14 2019-09-30 13F CIENA COM NEW 171779309 127,218 -325,926 -71.93 4,991 -73.22 0.0131
2019-08-23 2019-06-30 13F/A-1 CIENA COM NEW 171779309 453,144 -178,325 -28.24 18,638 -20.96 0.0481
2019-08-14 2019-06-30 13F CIENA COM NEW 171779309 453,144 -178,325 18,638
2019-05-15 2019-03-31 13F CIENA COM NEW 171779309 631,469 -199,012 -23.96 23,579 -16.27 0.0569
2019-02-06 2018-12-31 13F CIENA COM NEW 171779309 830,481 541,711 187.59 28,162 212.18 0.0740
2018-11-15 2018-09-30 13F CIENA COM NEW 171779309 288,770 201,400 230.51 9,021 289.51 0.0219
2018-08-13 2018-06-30 13F CIENA COM NEW 171779309 87,370 36,770 72.67 2,316 101.22 0.0059
2014-05-14 2014-03-31 13F CIENA COM NEW 171779309 50,600 -55,198 -52.17 1,151 -54.54 0.0056
2014-02-11 2013-12-31 13F/A-1 CIENA COM NEW 171779309 105,798 -191,926 -64.46 2,532 -66.00 0.0128
2014-02-03 2013-12-31 13F CIENA COM NEW 171779309 105,798 2,532
2013-11-12 2013-09-30 13F CIENA COM NEW 171779309 297,724 -168,579 -36.15 7,446 -17.81 0.0377
2013-08-20 2013-06-30 13F/A-1 CIENA COM NEW 171779309 466,303 466,303 9,060 0.0432
2013-08-09 2013-06-30 13F CIENA COM NEW 171779309 466,303 9,060 0.0433
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.