Ciena Corporation
DE ˙ XTRA ˙ US1717793095
446,00 € ↓ -115,00 (-20,50%)
2026-06-04
DEL PRIS
SecurityDE:CIE1 / Ciena Corporation
InstitutionAlliancebernstein L.p.
Latest Disclosed Ownership527,411 shares
Latest Disclosed Value $ 123,345,611
Alliancebernstein L.p. reports 47.50% increase in ownership of CIE1 / Ciena Corporation

On May 15, 2026 - Alliancebernstein L.p. filed a 13F-HR form disclosing ownership of 527,411 shares of Ciena Corporation (DE:CIE1) valued at $167,980,404 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 357,570 shares of Ciena Corporation. This represents a change in shares of 47.50% during the quarter. The current value of the position is $235,225,306 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)
2026-05-15 2026-03-31 13F CIENA COM NEW 171779309 527,411 169,841 47.50 123,346 47.50 0.0334
2026-02-17 2025-12-31 13F CIENA COM NEW 171779309 357,570 103,503 40.74 83,625 125.96 0.0264
2025-11-14 2025-09-30 13F CIENA COM NEW 171779309 254,067 -92,577 -26.71 37,010 31.27 0.0117
2025-08-14 2025-06-30 13F CIENA COM NEW 171779309 346,644 -84,873 -19.67 28,193 8.11 0.0092
2025-05-15 2025-03-31 13F CIENA COM NEW 171779309 431,517 -11,816 -2.67 26,077 -30.65 0.0094
2025-02-12 2024-12-31 13F CIENA COM NEW 171779309 443,333 6,079 1.39 37,599 39.62 0.0128
2024-11-14 2024-09-30 13F CIENA COM NEW 171779309 437,254 31,947 7.88 26,930 37.91 0.0090
2024-08-14 2024-06-30 13F CIENA COM NEW 171779309 405,307 160,872 65.81 19,528 61.55 0.0068
2024-05-14 2024-03-31 13F CIENA COM NEW 171779309 244,435 -23,795 -8.87 12,087 0.12 0.0043
2024-02-14 2023-12-31 13F CIENA COM NEW 171779309 268,230 -2,305,022 -89.58 12,073 -90.07 0.0046
2023-11-14 2023-09-30 13F CIENA COM NEW 171779309 2,573,252 -173,778 -6.33 121,612 4.19 0.0517
2023-08-15 2023-06-30 13F CIENA COM NEW 171779309 2,747,030 -1,562,949 -36.26 116,721 -48.44 0.0476
2023-05-15 2023-03-31 13F CIENA COM NEW 171779309 4,309,979 834,109 24.00 226,360 27.74 0.0970
2023-02-15 2022-12-31 13F CIENA COM NEW 171779309 3,475,870 -936,021 -21.22 177,200 -0.66 0.0797
2022-11-15 2022-09-30 13F CIENA COM NEW 171779309 4,411,891 -500,537 -10.19 178,373 -20.55 0.0864
2022-08-15 2022-06-30 13F CIENA COM NEW 171779309 4,912,428 -341,149 -6.49 224,498 -29.52 0.1025
2022-05-13 2022-03-31 13F CIENA COM NEW 171779309 5,253,577 185,187 3.65 318,524 -18.35 0.1229
2022-02-14 2021-12-31 13F CIENA COM NEW 171779309 5,068,390 1,409,823 38.53 390,114 107.65 0.1379
2021-11-10 2021-09-30 13F CIENA COM NEW 171779309 3,658,567 381,729 11.65 187,867 0.78 0.0741
2021-07-30 2021-06-30 13F CIENA COM NEW 171779309 3,276,838 719,196 28.12 186,419 33.20 0.0748
2021-05-06 2021-03-31 13F CIENA COM NEW 171779309 2,557,642 -67,006 -2.55 139,954 0.89 0.0614
2021-02-08 2020-12-31 13F CIENA COM NEW 171779309 2,624,648 -768,369 -22.65 138,713 3.00 0.0655
2020-11-12 2020-09-30 13F CIENA COM NEW 171779309 3,393,017 -146,989 -4.15 134,669 -29.76 0.0725
2020-08-13 2020-06-30 13F CIENA COM NEW 171779309 3,540,006 -715,887 -16.82 191,727 13.16 0.1127
2020-05-14 2020-03-31 13F CIENA COM NEW 171779309 4,255,893 1,038,125 32.26 169,427 23.34 0.1215
2020-02-18 2019-12-31 13F CIENA COM NEW 171779309 3,217,768 -951,999 -22.83 137,367 -16.02 0.0781
2019-11-14 2019-09-30 13F CIENA COM NEW 171779309 4,169,767 2,036,628 95.48 163,580 86.45 0.1018
2019-08-14 2019-06-30 13F CIENA COM NEW 171779309 2,133,139 -1,081,092 -33.63 87,736 -26.90 0.0545
2019-05-14 2019-03-31 13F CIENA COM NEW 171779309 3,214,231 369,444 12.99 120,019 24.41 0.0781
2019-02-13 2018-12-31 13F CIENA COM NEW 171779309 2,844,787 -1,743,738 -38.00 96,467 -32.70 0.0716
2018-11-08 2018-09-30 13F CIENA COM NEW 171779309 4,588,525 1,568,877 51.96 143,346 79.07 0.0936
2018-08-13 2018-06-30 13F CIENA COM NEW 171779309 3,019,648 -1,554,179 -33.98 80,051 -32.42 0.0557
2018-05-14 2018-03-31 13F CIENA COM NEW 171779309 4,573,827 2,047,067 81.02 118,462 124.00 0.0856
2018-02-13 2017-12-31 13F CIENA COM NEW 171779309 2,526,760 -893,755 -26.13 52,885 -29.63 0.0378
2017-11-13 2017-09-30 13F CIENA COM NEW 171779309 3,420,515 2,762,099 419.51 75,149 356.17 0.0563
2017-08-10 2017-06-30 13F CIENA COM NEW 171779309 658,416 1,363 0.21 16,474 6.19 0.0127
2017-05-11 2017-03-31 13F CIENA COM NEW 171779309 657,053 441,676 205.07 15,513 195.09 0.0124
2017-02-13 2016-12-31 13F CIENA COM NEW 171779309 215,377 -7,501 -3.37 5,257 8.19 0.0044
2016-11-10 2016-09-30 13F CIENA COM NEW 171779309 222,878 250 0.11 4,859 16.41 0.0041
2016-08-11 2016-06-30 13F CIENA COM NEW 171779309 222,628 -4,588,818 -95.37 4,174 -95.44 0.0036
2016-05-13 2016-03-31 13F CIENA COM NEW 171779309 4,811,446 -670,967 -12.24 91,514 -19.32 0.0778
2016-02-16 2015-12-31 13F/A-1 CIENA COM NEW 171779309 5,482,413 1,871,268 51.82 113,431 51.60 0.0965
2016-02-12 2015-12-31 13F CIENA COM NEW 171779309 5,482,413 113,596
2015-11-13 2015-09-30 13F CIENA COM NEW 171779309 3,611,145 3,412,355 1,716.56 74,823 1,489.61 0.0642
2015-08-14 2015-06-30 13F CIENA COM NEW 171779309 198,790 -24,202 -10.85 4,707 9.31 0.0039
2015-05-13 2015-03-31 13F CIENA COM NEW 171779309 222,992 -4,250 -1.87 4,306 -2.38 0.0035
2015-02-13 2014-12-31 13F CIENA COM NEW 171779309 227,242 -350 -0.15 4,411 15.93 0.0037
2014-11-13 2014-09-30 13F CIENA COM NEW 171779309 227,592 -17,387 -7.10 3,805 -28.29 0.0032
2014-08-13 2014-06-30 13F CIENA COM NEW 171779309 244,979 2,070 0.85 5,306 -3.95 0.0045
2014-05-13 2014-03-31 13F CIENA COM NEW 171779309 242,909 -3,614,342 -93.70 5,524 -94.02 0.0048
2014-02-13 2013-12-31 13F CIENA COM NEW 171779309 3,857,251 -1,255,046 -24.55 92,304 -27.72 0.0825
2013-11-14 2013-09-30 13F CIENA COM NEW 171779309 5,112,297 -514,371 -9.14 127,705 16.87 0.1261
2013-08-13 2013-06-30 13F CIENA COM NEW 171779309 5,626,668 5,626,668 109,270 0.1160
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.