Ciena Corporation
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionVanguard Group Inc
Latest Disclosed Ownership0 shares
Ownership 0.00%
Vanguard Group Inc ownership in CIEN / Ciena Corporation

2026-03-26 - Vanguard Group Inc has filed an SCHEDULE 13G/A form with the Securities and Exchange Commission (SEC) disclosing ownership of 0 shares of Ciena Corporation (MX:CIEN). This represents 0.0 percent ownership of the company. In their previous filing dated 2024-02-13 , Vanguard Group Inc had reported owning 15,026,070 shares, indicating a decrease of -100.00 percent.

Institutional Ownership: 13D/G Filings

This table shows a history of the 13D/G filings made by the investor and/or investor group. Note that the share values in this table are not directly comparable to any numbers shown in the 13F table (if any).

File
Date		Effective
Date		Form Prev
Shares		 Latest
Shares		 ΔShares
(Percent)		 Ownership
(Percent)		 ΔOwnership
(Percent)
2026-03-26 2026-03-26 13G/A 15,026,070 0 -100.00 0.00 -100.00
2024-02-13 2024-02-13 13G/A 14,954,778 15,026,070 0.48 10.37 3.39
2023-06-09 2023-06-09 13G/A 14,343,173 14,954,778 4.26 10.03 3.83
2023-02-09 2023-02-09 13G/A 14,549,184 14,343,173 -1.42 9.66 2.88
2022-02-09 2022-02-09 13G/A 14,312,747 14,549,184 1.65 9.39 1.40
2021-02-10 2021-02-10 13G/A 14,561,776 14,312,747 -1.71 9.26 -2.01
2020-02-12 2020-02-12 13G/A 13,338,962 14,561,776 9.17 9.45 10.92
2019-02-11 2019-02-11 13G/A 12,173,982 13,338,962 9.57 8.52 0.59
2018-02-09 2018-02-09 13G/A 11,027,426 12,173,982 10.40 8.47 7.90
2017-02-10 2017-02-10 13G/A 10,962,207 11,027,426 0.59 7.85 -2.73
2016-02-11 2016-02-11 13G/A 10,962,207 8.07
2015-02-11 2015-02-11 13G/A 7,202,472 6.73
2014-02-12 2014-02-12 13G/A 6,655,489 6.41
2013-02-13 2013-02-13 13G 5,920,939 5.88

Important Note: One of the primary uses of the 13D/G filings is to evaluate the ability of a firm to control a company (ie, the "beneficial ownership"). To that end, firms are required to report not just direct holdings in companies, but indirect holdings that they control. For investment firms, these indirect holdings can include shares in funds they manage, advisory accounts, and in the case of activist campaigns, pledged votes. Therefore, share counts listed in 13D/G filings can differ significantly than share counts listed in 13F filings.

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 14,376,579 -692,023 -4.59 3,362,251 53.17 0.0487
2025-11-07 2025-09-30 13F CIENA COM NEW 171779309 15,068,602 -19,843 -0.13 2,195,043 78.87 0.0329
2025-08-11 2025-06-30 13F CIENA COM NEW 171779309 15,088,445 103,199 0.69 1,227,143 35.51 0.0199
2025-05-09 2025-03-31 13F CIENA COM NEW 171779309 14,985,246 -331,394 -2.16 905,558 -30.29 0.0164
2025-02-11 2024-12-31 13F CIENA COM NEW 171779309 15,316,640 139,941 0.92 1,299,004 38.97 0.0226
2024-11-13 2024-09-30 13F CIENA COM NEW 171779309 15,176,699 200,813 1.34 934,733 29.55 0.0167
2024-08-13 2024-06-30 13F CIENA COM NEW 171779309 14,975,886 -41,594 -0.28 721,538 -2.84 0.0139
2024-05-10 2024-03-31 13F CIENA COM NEW 171779309 15,017,480 -8,591 -0.06 742,614 9.80 0.0147
2024-03-11 2023-12-31 13F/A-1 CIENA COM NEW 171779309 15,026,071 -58,623 -0.39 676,323 -5.13 0.0148
2024-02-14 2023-12-31 13F CIENA COM NEW 171779309 15,026,071 -58,623 676,323 0.0128
2023-12-18 2023-09-30 13F/A-1 CIENA COM NEW 171779309 15,084,694 155,964 1.04 712,903 12.39 0.0175
2023-11-14 2023-09-30 13F CIENA COM NEW 171779309 15,084,694 155,964 712,903 0.0032
2023-08-14 2023-06-30 13F CIENA COM NEW 171779309 14,928,730 354,247 2.43 634,322 -17.13 0.0150
2023-07-14 2023-03-31 13F/A-1 CIENA COM NEW 171779309 14,574,483 231,310 1.61 765,452 4.68 0.0195
2023-05-15 2023-03-31 13F CIENA COM NEW 171779309 14,574,483 231,310 765,452 0.0195
2023-02-10 2022-12-31 13F CIENA COM NEW 171779309 14,343,173 10,583 0.07 731,215 26.19 0.0199
2022-11-14 2022-09-30 13F CIENA COM NEW 171779309 14,332,590 -213,109 -1.47 579,466 -12.83 0.0170
2022-08-12 2022-06-30 13F CIENA COM NEW 171779309 14,545,699 188,232 1.31 664,739 -23.64 0.0187
2022-05-13 2022-03-31 13F CIENA COM NEW 171779309 14,357,467 -191,717 -1.32 870,493 -22.27 0.0206
2022-02-14 2021-12-31 13F CIENA COM NEW 171779309 14,549,184 29,799 0.21 1,119,851 50.20 0.0254
2021-11-12 2021-09-30 13F CIENA COM NEW 171779309 14,519,385 -115,373 -0.79 745,570 -10.45 0.0185
2021-08-13 2021-06-30 13F CIENA COM NEW 171779309 14,634,758 -28,152 -0.19 832,571 3.77 0.0207
2021-05-14 2021-03-31 13F CIENA COM NEW 171779309 14,662,910 350,163 2.45 802,354 6.07 0.0217
2021-02-12 2020-12-31 13F CIENA COM NEW 171779309 14,312,747 225,317 1.60 756,429 35.29 0.0219
2020-11-16 2020-09-30 13F CIENA COM NEW 171779309 14,087,430 -564,742 -3.85 559,130 -29.54 0.0185
2020-08-14 2020-06-30 13F CIENA COM NEW 171779309 14,652,172 -167,592 -1.13 793,562 34.51 0.0281
2020-05-15 2020-03-31 13F CIENA COM NEW 171779309 14,819,764 257,988 1.77 589,974 -5.09 0.0251
2020-02-14 2019-12-31 13F CIENA COM NEW 171779309 14,561,776 -321,486 -2.16 621,643 6.47 0.0212
2019-11-14 2019-09-30 13F CIENA COM NEW 171779309 14,883,262 150,965 1.02 583,871 -3.64 0.0217
2019-08-14 2019-06-30 13F CIENA COM NEW 171779309 14,732,297 -52,965 -0.36 605,939 9.76 0.0228
2019-05-15 2019-03-31 13F CIENA COM NEW 171779309 14,785,262 1,446,300 10.84 552,081 22.05 0.0217
2019-02-14 2018-12-31 13F CIENA COM NEW 171779309 13,338,962 369,534 2.85 452,324 11.64 0.0203
2018-12-13 2018-09-30 13F/A-2 CIENA COM NEW 171779309 12,969,428 240,201 1.89 405,165 20.07 0.0158
2018-11-23 2018-09-30 13F/A-1 CIENA COM NEW 171779309 12,969,428 0 405,165 0.0158
2018-11-14 2018-09-30 13F CIENA COM NEW 171779309 12,969,428 240,201 405,165
2018-08-14 2018-06-30 13F CIENA COM NEW 171779309 12,729,227 179,266 1.43 337,452 3.82 0.0141
2018-05-15 2018-03-31 13F CIENA COM NEW 171779309 12,549,961 375,979 3.09 325,044 27.57 0.0142
2018-02-14 2017-12-31 13F CIENA COM NEW 171779309 12,173,982 -440,005 -3.49 254,801 -8.06 0.0111
2017-11-14 2017-09-30 13F CIENA COM NEW 171779309 12,613,987 147,705 1.18 277,129 -11.15 0.0130
2017-08-24 2017-06-30 13F/A-1 CIENA COM NEW 171779309 12,466,282 203,112 1.66 311,906 7.73 0.0154
2017-08-11 2017-06-30 13F CIENA COM NEW 171779309 12,466,282 203,112 311,906
2017-05-12 2017-03-31 13F CIENA COM NEW 171779309 12,263,170 1,235,744 11.21 289,534 7.56 0.0149
2017-02-14 2016-12-31 13F CIENA COM NEW 171779309 11,027,426 19,795 0.18 269,180 12.17 0.0150
2016-11-14 2016-09-30 13F CIENA COM NEW 171779309 11,007,631 510,777 4.87 239,966 21.92 0.0141
2016-08-10 2016-06-30 13F CIENA COM NEW 171779309 10,496,854 -451,413 -4.12 196,815 -5.48 0.0122
2016-05-13 2016-03-31 13F CIENA COM NEW 171779309 10,948,267 -13,940 -0.13 208,236 -8.19 0.0135
2016-02-08 2015-12-31 13F CIENA COM NEW 171779309 10,962,207 854,110 8.45 226,807 8.29 0.0153
2015-11-12 2015-09-30 13F/A-1 CIENA COM NEW 171779309 10,108,097 2,002,129 24.70 209,441 9.11 0.0089
2015-11-12 2015-09-30 13F/A-1 CIENA COM NEW 171779309 10,108,097 2,002,129 209,441 0.0089
2015-11-12 2015-09-30 13F CIENA COM NEW 171779309 19,062,775 536,439
2015-08-13 2015-06-30 13F CIENA COM NEW 171779309 8,105,968 740,493 10.05 191,948 34.96 0.0130
2015-05-15 2015-03-31 13F/A-1 CIENA COM NEW 171779309 7,365,475 163,003 2.26 142,227 1.74 0.0096
2015-05-14 2015-03-31 13F CIENA COM NEW 171779309 7,365,475 142,227
2015-02-12 2014-12-31 13F CIENA COM NEW 171779309 7,202,472 321,289 4.67 139,800 21.51 0.0101
2014-11-12 2014-09-30 13F CIENA COM NEW 171779309 6,881,183 -11,217 -0.16 115,053 -22.93 0.0090
2014-08-11 2014-06-30 13F CIENA COM NEW 171779309 6,892,400 110,362 1.63 149,289 -3.20 0.0118
2014-05-13 2014-03-31 13F CIENA COM NEW 171779309 6,782,038 126,549 1.90 154,224 -3.17 0.0130
2014-02-12 2013-12-31 13F CIENA COM NEW 171779309 6,655,489 213,335 3.31 159,266 -1.03 0.0140
2013-11-07 2013-09-30 13F CIENA COM NEW 171779309 6,442,154 530,332 8.97 160,926 40.17 0.0157
2013-08-13 2013-06-30 13F CIENA COM NEW 171779309 5,911,822 5,911,822 114,807 0.0121
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.