Ciena Corporation
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionComerica Bank
Latest Disclosed Ownership37,966 shares
Latest Disclosed Value $ 8,879,252
Comerica Bank reports 7.57% decrease in ownership of CIEN / Ciena Corporation

On January 29, 2026 - Comerica Bank filed a 13F-HR form disclosing ownership of 37,966 shares of Ciena Corporation (MX:CIEN) valued at $8,879,252 USD as of December 31, 2025. The entity filed a previous 13F-HR on November 14, 2025 disclosing 41,077 shares of Ciena Corporation. This represents a change in shares of -7.57% during the quarter.

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)
2026-01-29 2025-12-31 13F CIENA COM NEW 171779309 37,966 -3,111 -7.57 8,879 48.40 0.0354
2025-11-14 2025-09-30 13F CIENA COM NEW 171779309 41,077 -6,462 -13.59 5,984 54.76 0.0225
2025-08-14 2025-06-30 13F CIENA COM NEW 171779309 47,539 582 1.24 3,866 36.27 0.0150
2025-05-14 2025-03-31 13F CIENA COM NEW 171779309 46,957 -3,211 -6.40 2,838 -33.31 0.0119
2025-02-14 2024-12-31 13F/A-1 CIENA COM NEW 171779309 50,168 -40,262 -44.52 4,255 -23.61 0.0172
2025-02-14 2024-12-31 13F CIENA COM NEW 171779309 50,168 -40,262 4,255 0.0143
2024-11-14 2024-09-30 13F CIENA COM NEW 171779309 90,430 32,687 56.61 5,570 100.18 0.0220
2024-08-15 2024-06-30 13F CIENA COMMON 171779309 57,743 -4,335 -6.98 2,782 -9.35 0.0116
2024-05-16 2024-03-31 13F CIENA COMMON 171779309 62,078 -3,478 -5.31 3,070 4.03 0.0132
2024-02-14 2023-12-31 13F CIENA COMMON 171779309 65,556 -32,717 -33.29 2,951 -36.48 0.0136
2023-11-21 2023-09-30 13F CIENA COMMON 171779309 98,273 98,273 4,644 0.0242
2023-08-22 2023-06-30 13F CIENA COM 171779309 0 -97,992 -100.00 0 -100.00
2023-01-26 2022-12-31 13F CIENA COM 171779309 97,992 -4,709 -4.59 5 -99.89 0.0389
2022-10-28 2022-09-30 13F CIENA COM 171779309 102,701 -397 -0.39 4,487 -11.62 0.0378
2022-08-02 2022-06-30 13F CIENA COM 171779309 103,098 -1,402 -1.34 5,077 -15.78 0.0417
2022-04-27 2022-03-31 13F CIENA COM 171779309 104,500 11,543 12.42 6,028 0.33 0.0437
2022-02-18 2021-12-31 13F CIENA COM 171779309 92,957 -462 -0.49 6,008 22.11 0.0442
2021-11-22 2021-09-30 13F CIENA COM 171779309 93,419 -14,776 -13.66 4,920 -17.26 0.0296
2021-08-26 2021-06-30 13F CIENA COM 171779309 108,195 -1,468 -1.34 5,946 -0.44 0.0355
2021-04-28 2021-03-31 13F CIENA COM 171779309 109,663 1,538 1.42 5,972 0.37 0.0356
2021-01-28 2020-12-31 13F CIENA COM 171779309 108,125 13,628 14.42 5,950 52.68 0.0378
2020-10-30 2020-09-30 13F CIENA COM 171779309 94,497 -599 -0.63 3,897 -25.43 0.0283
2020-07-31 2020-06-30 13F CIENA COM 171779309 95,096 4,740 5.25 5,226 24.16 0.0403
2020-05-01 2020-03-31 13F CIENA COM 171779309 90,356 301 0.33 4,209 10.79 0.0386
2020-02-07 2019-12-31 13F CIENA COM 171779309 90,055 1,102 1.24 3,799 15.79 0.0288
2019-10-31 2019-09-30 13F CIENA COM 171779309 88,953 6,629 8.05 3,281 -9.64 0.0259
2019-08-02 2019-06-30 13F CIENA COM 171779309 82,324 -9,322 -10.17 3,631 6.08 0.0291
2019-05-02 2019-03-31 13F CIENA COM 171779309 91,646 -512 -0.56 3,423 -5.73 0.0277
2019-02-06 2018-12-31 13F CIENA COM 171779309 92,158 1,935 2.14 3,631 30.28 0.0308
2018-11-01 2018-09-30 13F CIENA COM 171779309 90,223 -17,955 -16.60 2,787 -4.39 0.0225
2018-08-01 2018-06-30 13F CIENA COM 171779309 108,178 -4,330 -3.85 2,915 -1.15 0.0204
2018-05-01 2018-03-31 13F CIENA COM 171779309 112,508 1,126 1.01 2,949 22.67 0.0211
2018-02-02 2017-12-31 13F CIENA COM 171779309 111,382 1,546 1.41 2,404 5.16 0.0160
2017-11-06 2017-09-30 13F CIENA COM 171779309 109,836 -50 -0.05 2,286 -21.52 0.0165
2017-08-03 2017-06-30 13F CIENA COM 171779309 109,886 1,301 1.20 2,913 15.87 0.0218
2017-05-03 2017-03-31 13F CIENA COM 171779309 108,585 5,642 5.48 2,514 -0.44 0.0191
2017-02-08 2016-12-31 13F CIENA COM 171779309 102,943 14,013 15.76 2,525 40.04 0.0200
2016-08-11 2016-06-30 13F CIENA COM 171779309 88,930 2,153 2.48 1,803 16.70 0.0156
2016-05-11 2016-03-31 13F CIENA COM 171779309 86,777 -694 -0.79 1,545 -2.77 0.0138
2016-02-05 2015-12-31 13F CIENA COM 171779309 87,471 67 0.08 1,589 -12.26 0.0156
2015-11-12 2015-09-30 13F CIENA COM 171779309 87,404 -74,284 -45.94 1,811 -52.69 0.0172
2015-08-13 2015-06-30 13F CIENA COM 171779309 161,688 87,108 116.80 3,828 165.83 0.0164
2015-05-15 2015-03-31 13F CIENA COM 171779309 74,580 -73,000 -49.46 1,440 -49.72 0.0122
2015-02-13 2014-12-31 13F CIENA COM 171779309 147,580 71,364 93.63 2,864 124.80 0.0124
2014-10-21 2014-09-30 13F CIENA COM 171779309 76,216 2,328 3.15 1,274 -20.37 0.0112
2014-08-12 2014-06-30 13F CIENA COM 171779309 73,888 -7,328 -9.02 1,600 -13.37 0.0136
2014-05-15 2014-03-31 13F CIENA COM 171779309 81,216 2,349 2.98 1,847 -2.12 0.0141
2014-02-11 2013-12-31 13F CIENA COM 171779309 78,867 -8,449 -9.68 1,887 -13.56 0.0146
2013-11-12 2013-09-30 13F CIENA COM 171779309 87,316 3,906 4.68 2,183 34.67 0.0152
2013-08-13 2013-06-30 13F/A-1 CIENA COM 171779309 83,410 83,410 1,621 0.0132
2013-08-08 2013-06-30 13F CIENA COM 171779309 333,469 6,481
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.