Ciena Corporation
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionRhumbline Advisers
Latest Disclosed Ownership246,308 shares
Latest Disclosed Value $ 95,624,047
Rhumbline Advisers reports 35.77% decrease in ownership of CIEN / Ciena Corporation

On May 12, 2026 - Rhumbline Advisers filed a 13F-HR form disclosing ownership of 246,308 shares of Ciena Corporation (MX:CIEN) valued at $95,624,047 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 383,482 shares of Ciena Corporation. This represents a change in shares of -35.77% 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)
2026-05-12 2026-03-31 13F CIENA COM 171779309 246,308 -137,174 -35.77 95,624 6.62 0.0818
2026-02-13 2025-12-31 13F CIENA COM 171779309 383,482 11,046 2.97 89,685 65.31 0.0725
2025-11-06 2025-09-30 13F CIENA COM 171779309 372,436 -6,219 -1.64 54,253 76.17 0.0436
2025-08-12 2025-06-30 13F CIENA COM 171779309 378,655 -2,705 -0.71 30,796 33.63 0.0264
2025-05-29 2025-03-31 13F/A-1 CIENA COM 171779309 381,360 -8,788 -2.25 23,046 -30.35 0.0216
2025-04-08 2025-03-31 13F CIENA COM 171779309 381,360 -8,788 23,046 0.0216
2025-05-29 2024-12-31 13F/A-1 CIENA COM 171779309 390,148 2,594 0.67 33,088 38.62 0.0296
2025-01-30 2024-12-31 13F CIENA COM 171779309 390,148 2,594 33,088 0.0296
2024-11-12 2024-09-30 13F CIENA COM 171779309 387,554 -4,559 -1.16 23,869 26.35 0.0215
2024-08-01 2024-06-30 13F CIENA COM 171779309 392,113 -15,495 -3.80 18,892 -6.28 0.0178
2024-05-09 2024-03-31 13F CIENA COM 171779309 407,608 -24,607 -5.69 20,156 3.61 0.0194
2024-02-08 2023-12-31 13F CIENA COM 171779309 432,215 -21,706 -4.78 19,454 -9.32 0.0204
2023-11-09 2023-09-30 13F CIENA COM 171779309 453,921 -6,179 -1.34 21,452 9.73 0.0249
2023-08-08 2023-06-30 13F CIENA COM 171779309 460,100 7,892 1.75 19,550 84,895.65 0.0219
2023-05-11 2023-03-31 13F CIENA COM 171779309 452,208 -1,150 -0.25 24 -99.90 0.0293
2023-02-14 2022-12-31 13F CIENA COM 171779309 453,358 19,077 4.39 23,112 31.63 0.0311
2022-11-10 2022-09-30 13F CIENA COM 171779309 434,281 3,934 0.91 17,558 -10.72 0.0262
2022-08-11 2022-06-30 13F CIENA COM 171779309 430,347 24,598 6.06 19,667 -20.06 0.0287
2022-05-12 2022-03-31 13F CIENA COM 171779309 405,749 -8,369 -2.02 24,601 -22.82 0.0317
2022-02-10 2021-12-31 13F CIENA COM 171779309 414,118 -2,408 -0.58 31,875 49.03 0.0391
2021-11-12 2021-09-30 13F CIENA COM 171779309 416,526 -13,674 -3.18 21,389 -12.61 0.0289
2021-08-05 2021-06-30 13F CIENA COM 171779309 430,200 -2,987 -0.69 24,474 3.25 0.0321
2021-05-06 2021-03-31 13F CIENA COM 171779309 433,187 10,169 2.40 23,704 6.02 0.0322
2021-02-10 2020-12-31 13F CIENA COM 171779309 423,018 11,672 2.84 22,357 36.94 0.0309
2020-11-12 2020-09-30 13F CIENA COM 171779309 411,346 -11,224 -2.66 16,326 -28.66 0.0256
2020-08-13 2020-06-30 13F CIENA COM 171779309 422,570 4,733 1.13 22,886 37.59 0.0382
2020-05-06 2020-03-31 13F CIENA COM 171779309 417,837 33,107 8.61 16,634 1.28 0.0349
2020-02-05 2019-12-31 13F CIENA COM 171779309 384,730 -11,074 -2.80 16,424 5.78 0.0275
2019-10-23 2019-09-30 13F CIENA COM 171779309 395,804 15,706 4.13 15,527 -0.68 0.0284
2019-08-14 2019-06-30 13F CIENA COM 171779309 380,098 -94,955 -19.99 15,633 -11.87 0.0293
2019-05-01 2019-03-31 13F CIENA COM 171779309 475,053 10,424 2.24 17,738 12.58 0.0343
2019-01-31 2018-12-31 13F CIENA COM 171779309 464,629 195,296 72.51 15,756 87.26 0.0343
2018-11-07 2018-09-30 13F CIENA COM 171779309 269,333 889 0.33 8,414 18.24 0.0163
2018-08-06 2018-06-30 13F CIENA COM 171779309 268,444 15,794 6.25 7,116 8.74 0.0144
2018-05-02 2018-03-31 13F CIENA COM 171779309 252,650 -9,728 -3.71 6,544 19.16 0.0137
2018-02-09 2017-12-31 13F CIENA COM 171779309 262,378 -25,167 -8.75 5,492 -13.06 0.0112
2017-11-06 2017-09-30 13F CIENA COM 171779309 287,545 1,281 0.45 6,317 -11.80 0.0137
2017-08-02 2017-06-30 13F CIENA COM 171779309 286,264 2,643 0.93 7,162 6.96 0.0163
2017-05-02 2017-03-31 13F CIENA COM 171779309 283,621 6,973 2.52 6,696 -0.84 0.0156
2017-01-27 2016-12-31 13F CIENA COM 171779309 276,648 13,821 5.26 6,753 17.85 0.0171
2016-11-08 2016-09-30 13F CIENA COM 171779309 262,827 17,322 7.06 5,730 24.48 0.0158
2016-08-11 2016-06-30 13F CIENA COM 171779309 245,505 6,442 2.69 4,603 1.23 0.0136
2016-05-02 2016-03-31 13F CIENA CORP USD.01 COM 171779309 239,063 7,905 3.42 4,547 -4.93 0.0141
2016-02-03 2015-12-31 13F CIENA CORP USD.01 COM 171779309 231,158 14,915 6.90 4,783 6.74 0.0154
2015-11-04 2015-09-30 13F CIENA CORP USD.01 COM 171779309 216,243 14,373 7.12 4,481 -6.26 0.0152
2015-08-04 2015-06-30 13F CIENA CORP USD.01 COM 171779309 201,870 26,170 14.89 4,780 40.88 0.0152
2015-05-12 2015-03-31 13F CIENA CORP USD.01 COM 171779309 175,700 24,344 16.08 3,393 15.49 0.0098
2015-02-06 2014-12-31 13F CIENA CORP USD.01 COM 171779309 151,356 -8,134 -5.10 2,938 10.16 0.0085
2014-11-12 2014-09-30 13F CIENA CORP USD.01 COM 171779309 159,490 20 0.01 2,667 -22.79 0.0080
2014-08-06 2014-06-30 13F CIENA CORP USD.01 COM 171779309 159,470 -29,975 -15.82 3,454 -19.82 0.0101
2014-05-06 2014-03-31 13F CIENA CORP USD.01 COM 171779309 189,445 -3,060 -1.59 4,308 -6.49 0.0128
2014-02-03 2013-12-31 13F CIENA CORP USD.01 COM 171779309 192,505 -6,507 -3.27 4,607 -7.32 0.0136
2013-11-05 2013-09-30 13F CIENA CORP USD.01 COM 171779309 199,012 -1,335 -0.67 4,971 27.76 0.0154
2013-08-07 2013-06-30 13F CIENA CORP USD.01 COM 171779309 200,347 200,347 3,891 0.0125
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.