시에나 주식회사
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionDimensional Fund Advisors Lp
Latest Disclosed Ownership1,146,020 shares
Latest Disclosed Value $ 444,746,223
Dimensional Fund Advisors Lp reports 17.96% decrease in ownership of CIEN / Ciena Corporation

On May 7, 2026 - Dimensional Fund Advisors Lp filed a 13F-HR form disclosing ownership of 1,146,020 shares of Ciena Corporation (MX:CIEN) valued at $444,746,223 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 12, 2026 disclosing 1,396,874 shares of Ciena Corporation. This represents a change in shares of -17.96% 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-07 2026-03-31 13F CIENA COM NEW 171779309 1,146,020 -250,854 -17.96 444,746 36.12 0.0199
2026-02-12 2025-12-31 13F CIENA COM NEW 171779309 1,396,874 -598,825 -30.01 326,720 12.39 0.0685
2025-11-12 2025-09-30 13F CIENA COM NEW 171779309 1,995,699 -273,525 -12.05 290,691 57.49 0.0624
2025-08-12 2025-06-30 13F CIENA COM NEW 171779309 2,269,224 -108,254 -4.55 184,572 28.47 0.0427
2025-05-13 2025-03-31 13F CIENA COM NEW 171779309 2,377,478 -225,053 -8.65 143,671 -34.91 0.0357
2025-02-13 2024-12-31 13F CIENA COM NEW 171779309 2,602,531 -43,513 -1.64 220,726 35.44 0.0530
2024-11-07 2024-09-30 13F CIENA COM NEW 171779309 2,646,044 -60,264 -2.23 162,972 24.99 0.0395
2024-08-09 2024-06-30 13F CIENA COM NEW 171779309 2,706,308 523,313 23.97 130,392 20.79 0.0341
2024-05-10 2024-03-31 13F CIENA COM NEW 171779309 2,182,995 20,585 0.95 107,949 10.91 0.0292
2024-02-07 2023-12-31 13F CIENA COM NEW 171779309 2,162,410 332,181 18.15 97,331 12.52 0.0284
2023-11-09 2023-09-30 13F CIENA COM NEW 171779309 1,830,229 157,604 9.42 86,499 21.71 0.0284
2023-08-09 2023-06-30 13F CIENA COM NEW 171779309 1,672,625 -7,809 -0.46 71,072 -19.47 0.0227
2023-05-12 2023-03-31 13F CIENA COM NEW 171779309 1,680,434 -5,517 -0.33 88,254 103,728.24 0.0297
2023-02-09 2022-12-31 13F CIENA COM NEW 171779309 1,685,951 21,446 1.29 86 -99.87 0.0254
2022-11-10 2022-09-30 13F CIENA COM NEW 171779309 1,664,505 -8,256 -0.49 67,300 -11.96 0.0258
2022-08-12 2022-06-30 13F CIENA COM NEW 171779309 1,672,761 -80,991 -4.62 76,441 -28.11 0.0274
2022-05-13 2022-03-31 13F CIENA COM 171779309 1,753,752 41,815 2.44 106,335 -19.30 0.0328
2022-02-09 2021-12-31 13F CIENA COM 171779309 1,711,937 2,414 0.14 131,766 50.10 0.0398
2021-11-12 2021-09-30 13F CIENA COM 171779309 1,709,523 -1,342 -0.08 87,785 -9.81 0.0283
2021-08-12 2021-06-30 13F CIENA COM 171779309 1,710,865 -18,128 -1.05 97,334 2.88 0.0308
2021-05-14 2021-03-31 13F CIENA COM 171779309 1,728,993 28,000 1.65 94,611 5.25 0.0313
2021-03-08 2020-12-31 13F/A-2 CIENA COM 171779309 1,700,993 50,665 3.07 89,895 37.24 0.0325
2021-02-11 2020-12-31 13F CIENA COM 171779309 1,700,993 50,665 89,895 32,465.2958
2020-11-12 2020-09-30 13F CIENA COM 171779309 1,650,328 6,032 0.37 65,503 -26.44 0.0278
2020-08-13 2020-06-30 13F CIENA COM 171779309 1,644,296 -16,818 -1.01 89,044 34.63 0.0391
2020-05-14 2020-03-31 13F CIENA COM 171779309 1,661,114 50,455 3.13 66,140 -3.81 0.0345
2020-02-14 2019-12-31 13F CIENA COM 171779309 1,610,659 -6,483 -0.40 68,759 8.38 0.0251
2019-11-12 2019-09-30 13F CIENA COM 171779309 1,617,142 -292,419 -15.31 63,442 -19.23 0.0247
2019-08-13 2019-06-30 13F CIENA COM 171779309 1,909,561 -1,099,882 -36.55 78,544 -30.10 0.0305
2019-08-12 2019-03-31 13F/A-2 CIENA COM 171779309 3,009,443 -182,176 -5.71 112,372 3.83 0.0448
2019-05-10 2019-03-31 13F CIENA COM 171779309 3,009,443 -182,176 112,372
2019-02-26 2018-12-31 13F/A-1 CIENA COM 171779309 3,191,619 -735,000 -18.72 108,224 -11.77 0.0490
2019-02-13 2018-12-31 13F CIENA COM 171779309 3,191,619 -735,000 108,224
2018-11-13 2018-09-30 13F CIENA COM 171779309 3,926,619 -703,432 -15.19 122,666 -0.06 0.0467
2018-08-10 2018-06-30 13F CIENA COM 171779309 4,630,051 224,828 5.10 122,740 7.58 0.0489
2018-05-11 2018-03-31 13F CIENA COM 171779309 4,405,223 1,026,844 30.39 114,095 61.35 0.0476
2018-02-12 2017-12-31 13F CIENA COM 171779309 3,378,379 551,855 19.52 70,713 13.87 0.0293
2017-11-13 2017-09-30 13F CIENA COM 171779309 2,826,524 5,349 0.19 62,099 -12.03 0.0271
2017-08-11 2017-06-30 13F CIENA COM 171779309 2,821,175 34,088 1.22 70,588 7.27 0.0326
2017-05-12 2017-03-31 13F CIENA COM 171779309 2,787,087 -145,013 -4.95 65,803 -8.06 0.0314
2017-02-09 2016-12-31 13F CIENA COM 171779309 2,932,100 165,373 5.98 71,573 18.67 0.0357
2016-11-10 2016-09-30 13F CIENA COM 171779309 2,766,727 312,906 12.75 60,315 31.09 0.0326
2016-08-09 2016-06-30 13F CIENA COM 171779309 2,453,821 -179,483 -6.82 46,009 -8.14 0.0265
2016-05-13 2016-03-31 13F CIENA COM 171779309 2,633,304 225,123 9.35 50,084 0.52 0.0300
2016-02-10 2015-12-31 13F CIENA COM 171779309 2,408,181 189,415 8.54 49,826 8.38 0.0311
2015-11-13 2015-09-30 13F CIENA COM 171779309 2,218,766 199,573 9.88 45,972 -3.85 0.0302
2015-08-14 2015-06-30 13F CIENA COM 171779309 2,019,193 349,723 20.95 47,815 48.32 0.0293
2015-05-14 2015-03-31 13F CIENA COM 171779309 1,669,470 912,319 120.49 32,237 119.34 0.0204
2015-02-06 2014-12-31 13F CIENA COM 171779309 757,151 -868,304 -53.42 14,697 -45.93 0.0097
2014-11-13 2014-09-30 13F CIENA COM 171779309 1,625,455 37,054 2.33 27,179 -21.00 0.0193
2014-08-08 2014-06-30 13F CIENA COM 171779309 1,588,401 131,581 9.03 34,404 3.85 0.0239
2014-05-14 2014-03-31 13F CIENA COM 171779309 1,456,820 270,223 22.77 33,127 16.66 0.0248
2014-02-12 2013-12-31 13F CIENA COM 171779309 1,186,597 727,860 158.67 28,395 147.82 0.0221
2013-11-13 2013-09-30 13F CIENA COM 171779309 458,737 457,137 28,571.06 11,458 36,861.29 0.0099
2013-08-15 2013-06-30 13F CIENA COM 171779309 1,600 1,600 31 0.0000
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.