Ciena Corporation
US ˙ NYSE ˙ US1717793095

SecurityCIEN / Ciena Corporation
InstitutionFIL Ltd
Latest Disclosed Ownership21,809 shares
Latest Disclosed Value $ 8,466,908
FIL Ltd reports 48.41% increase in ownership of CIEN / Ciena Corporation

On May 15, 2026 - FIL Ltd filed a 13F-HR form disclosing ownership of 21,809 shares of Ciena Corporation (US:CIEN) valued at $8,466,908 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 14,695 shares of Ciena Corporation. This represents a change in shares of 48.41% during the quarter. The current value of the position is $11,681,555 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 21,809 7,114 48.41 8,467 146.39 0.0037
2026-02-17 2025-12-31 13F CIENA COM NEW 171779309 14,695 12,503 570.39 3,437 977.12 0.0026
2025-11-13 2025-09-30 13F CIENA COM NEW 171779309 2,192 2,192 319 0.0003
2025-05-12 2025-03-31 13F CIENA COM NEW 171779309 0 -1,444,991 -100.00 0 -100.00
2025-02-13 2024-12-31 13F CIENA COM NEW 171779309 1,444,991 -1,239,171 -46.17 122,550 -25.87 0.1145
2024-11-13 2024-09-30 13F CIENA COM NEW 171779309 2,684,162 -482,374 -15.23 165,318 8.36 0.1499
2024-08-13 2024-06-30 13F CIENA COM NEW 171779309 3,166,536 505,837 19.01 152,564 15.95 0.1508
2024-05-13 2024-03-31 13F CIENA COM NEW 171779309 2,660,699 -1,302 -0.05 131,572 9.81 0.1304
2024-02-13 2023-12-31 13F CIENA COM NEW 171779309 2,662,001 -1,525 -0.06 119,817 -4.82 0.1259
2023-11-13 2023-09-30 13F CIENA COM NEW 171779309 2,663,526 -116,244 -4.18 125,878 6.58 0.1482
2023-08-11 2023-06-30 13F CIENA COM NEW 171779309 2,779,770 245,909 9.70 118,112 -11.25 0.1327
2023-05-11 2023-03-31 13F CIENA COM NEW 171779309 2,533,861 534,725 26.75 133,078 30.58 0.1526
2023-02-13 2022-12-31 13F CIENA COM NEW 171779309 1,999,136 -1,127,816 -36.07 101,916 -19.39 0.1223
2022-11-10 2022-09-30 13F CIENA COM NEW 171779309 3,126,952 1,123,439 56.07 126,423 38.08 0.1626
2022-08-12 2022-06-30 13F CIENA COM NEW 171779309 2,003,513 1,788,079 829.99 91,561 600.97 0.1090
2022-05-13 2022-03-31 13F CIENA COM NEW 171779309 215,434 -2,934,834 -93.16 13,062 -94.61 0.0134
2022-02-14 2021-12-31 13F CIENA COM NEW 171779309 3,150,268 82,888 2.70 242,476 53.94 0.2487
2021-11-15 2021-09-30 13F CIENA COM NEW 171779309 3,067,380 178,575 6.18 157,510 -4.16 0.1749
2021-08-13 2021-06-30 13F CIENA COM NEW 171779309 2,888,805 855,616 42.08 164,344 47.72 0.1764
2021-05-14 2021-03-31 13F CIENA COM NEW 171779309 2,033,189 -82,074 -3.88 111,256 -0.48 0.1266
2021-03-23 2020-12-31 13F/A-1 CIENA COM NEW 171779309 2,115,263 3,744 0.18 111,792 33.39 0.1377
2021-02-08 2020-12-31 13F CIENA COM NEW 171779309 2,115,263 3,744 111,792 54,068.5171
2020-11-13 2020-09-30 13F CIENA COM NEW 171779309 2,111,519 -98,858 -4.47 83,806 -29.99 0.1039
2020-08-13 2020-06-30 13F CIENA COM NEW 171779309 2,210,377 -253,279 -10.28 119,714 22.06 0.1614
2020-05-14 2020-03-31 13F CIENA COM NEW 171779309 2,463,656 -1,179,183 -32.37 98,078 -36.93 0.1611
2020-02-07 2019-12-31 13F CIENA COM NEW 171779309 3,642,839 301,267 9.02 155,513 18.63 0.2156
2019-11-13 2019-09-30 13F CIENA COM NEW 171779309 3,341,572 1,100,026 49.07 131,090 42.19 0.1982
2019-08-13 2019-06-30 13F CIENA COM NEW 171779309 2,241,546 148,871 7.11 92,194 17.99 0.1390
2019-05-13 2019-03-31 13F CIENA COM NEW 171779309 2,092,675 -1,583,818 -43.08 78,140 -37.32 0.1224
2019-02-13 2018-12-31 13F CIENA COM NEW 171779309 3,676,493 -553,226 -13.08 124,670 -5.65 0.2212
2018-11-09 2018-09-30 13F CIENA COM NEW 171779309 4,229,719 -427,772 -9.18 132,136 7.02 0.1954
2018-08-10 2018-06-30 13F CIENA COM NEW 171779309 4,657,491 635,355 15.80 123,470 18.52 0.1862
2018-05-14 2018-03-31 13F CIENA COM NEW 171779309 4,022,136 453,397 12.70 104,174 39.47 0.2863
2018-02-12 2017-12-31 13F CIENA COM NEW 171779309 3,568,739 776,991 27.83 74,694 21.78 0.2079
2017-11-13 2017-09-30 13F CIENA COM NEW 171779309 2,791,748 1,872,101 203.57 61,335 166.56 0.1758
2017-08-29 2017-06-30 13F/A-1 CIENA COM NEW 171779309 919,647 919,647 23,010 0.0664
2017-08-11 2017-06-30 13F CIENA COM NEW 171779309 919,647 919,647 23,010
2015-11-10 2015-09-30 13F CIENA COM NEW 171779309 0 -1,320,559 -100.00 0 -100.00
2015-08-13 2015-06-30 13F CIENA COM NEW 171779309 1,320,559 0 0.00 31,271 22.63 0.0997
2015-05-14 2015-03-31 13F CIENA COM NEW 171779309 1,320,559 128,067 10.74 25,500 10.17 0.0821
2015-02-17 2014-12-31 13F CIENA COM NEW 171779309 1,192,492 282,478 31.04 23,146 52.13 0.0799
2014-11-14 2014-09-30 13F CIENA COM NEW 171779309 910,014 -14,691 -1.59 15,215 -24.04 0.0583
2014-08-14 2014-06-30 13F CIENA COM NEW 171779309 924,705 -110,485 -10.67 20,029 -14.92 0.0751
2014-05-15 2014-03-31 13F CIENA COM NEW 171779309 1,035,190 351,490 51.41 23,540 43.88 0.0854
2014-02-13 2013-12-31 13F CIENA COM NEW 171779309 683,700 222,200 48.15 16,361 41.92 0.0659
2013-11-14 2013-09-30 13F CIENA COM NEW 171779309 461,500 461,500 11,528 0.0551
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.