시에나 주식회사
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionProShare Advisors LLC
Latest Disclosed Ownership25,555 shares
Latest Disclosed Value $ 9,921,217
ProShare Advisors LLC reports 351.82% increase in ownership of CIEN / Ciena Corporation

On April 24, 2026 - ProShare Advisors LLC filed a 13F-HR form disclosing ownership of 25,555 shares of Ciena Corporation (MX:CIEN) valued at $9,921,217 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 6, 2026 disclosing 5,656 shares of Ciena Corporation. This represents a change in shares of 351.82% 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)
2026-04-24 2026-03-31 13F CIENA COM NEW 171779309 25,555 19,899 351.82 9,921 650.45 0.0147
2026-02-06 2025-12-31 13F CIENA COM NEW 171779309 5,656 -355 -5.91 1,323 51.09 0.0023
2025-11-06 2025-09-30 13F CIENA COM NEW 171779309 6,011 -290 -4.60 876 70.90 0.0018
2025-08-07 2025-06-30 13F CIENA COM NEW 171779309 6,301 247 4.08 512 40.27 0.0010
2025-05-08 2025-03-31 13F CIENA COM NEW 171779309 6,054 -702 -10.39 366 -36.19 0.0008
2025-02-14 2024-12-31 13F CIENA COM NEW 171779309 6,756 492 7.85 573 48.57 0.0013
2024-11-14 2024-09-30 13F CIENA COM NEW 171779309 6,264 -555 -8.14 386 17.38 0.0009
2024-08-13 2024-06-30 13F CIENA COM NEW 171779309 6,819 -261 -3.69 329 -6.29 0.0009
2024-05-08 2024-03-31 13F CIENA COM NEW 171779309 7,080 -697 -8.96 350 0.00 0.0009
2024-02-14 2023-12-31 13F CIENA COM NEW 171779309 7,777 -297 -3.68 350 -8.14 0.0011
2023-11-13 2023-09-30 13F CIENA COM NEW 171779309 8,074 -640 -7.34 382 2.97 0.0012
2023-08-10 2023-06-30 13F CIENA COM NEW 171779309 8,714 -115 -1.30 370 -20.09 0.0011
2023-05-26 2023-03-31 13F/A-1 CIENA COM NEW 171779309 8,829 -5,240 -37.25 464 -35.43 0.0014
2023-05-12 2023-03-31 13F CIENA COM NEW 171779309 8,829 -5,240 464 0.0015
2023-02-02 2022-12-31 13F CIENA COM NEW 171779309 14,069 390 2.85 717 29.42 0.0025
2022-11-07 2022-09-30 13F CIENA COM NEW 171779309 13,679 -1,254 -8.40 554 -18.89 0.0021
2022-08-01 2022-06-30 13F CIENA COM NEW 171779309 14,933 -6,346 -29.82 683 -47.01 0.0023
2022-05-10 2022-03-31 13F CIENA COM NEW 171779309 21,279 -4,734 -18.20 1,289 -35.61 0.0028
2022-02-08 2021-12-31 13F CIENA COM NEW 171779309 26,013 6,300 31.96 2,002 97.83 0.0039
2021-11-12 2021-09-30 13F CIENA COM NEW 171779309 19,713 -1,111 -5.34 1,012 -14.60 0.0028
2021-08-13 2021-06-30 13F CIENA COM NEW 171779309 20,824 260 1.26 1,185 5.33 0.0035
2021-05-14 2021-03-31 13F CIENA COM NEW 171779309 20,564 698 3.51 1,125 7.14 0.0035
2021-02-09 2020-12-31 13F CIENA COM NEW 171779309 19,866 2,301 13.10 1,050 50.65 0.0039
2020-11-13 2020-09-30 13F CIENA COM NEW 171779309 17,565 -35 -0.20 697 -26.86 0.0032
2020-08-03 2020-06-30 13F CIENA COM NEW 171779309 17,600 5,646 47.23 953 100.21 0.0051
2020-05-15 2020-03-31 13F CIENA COM NEW 171779309 11,954 -9,532 -44.36 476 -48.09 0.0034
2020-02-12 2019-12-31 13F CIENA COM NEW 171779309 21,486 2,110 10.89 917 20.66 0.0042
2019-11-12 2019-09-30 13F CIENA COM NEW 171779309 19,376 -14,470 -42.75 760 -45.40 0.0043
2019-08-13 2019-06-30 13F CIENA COM NEW 171779309 33,846 -574 -1.67 1,392 8.33 0.0083
2019-05-15 2019-03-31 13F CIENA COM NEW 171779309 34,420 3,477 11.24 1,285 22.50 0.0077
2019-02-14 2018-12-31 13F CIENA COM NEW 171779309 30,943 -7,529 -19.57 1,049 -12.73 0.0073
2018-11-14 2018-09-30 13F CIENA COM NEW 171779309 38,472 -2,124 -5.23 1,202 11.71 0.0082
2018-08-13 2018-06-30 13F CIENA COM NEW 171779309 40,596 1,978 5.12 1,076 7.60 0.0072
2018-05-14 2018-03-31 13F CIENA COM NEW 171779309 38,618 -644 -1.64 1,000 21.65 0.0065
2018-02-14 2017-12-31 13F CIENA COM NEW 171779309 39,262 15,772 67.14 822 59.30 0.0057
2017-11-13 2017-09-30 13F CIENA COM NEW 171779309 23,490 -3,965 -14.44 516 -24.89 0.0047
2017-08-11 2017-06-30 13F CIENA COM NEW 171779309 27,455 -3,394 -11.00 687 -5.63 0.0068
2017-05-12 2017-03-31 13F/A-2 CIENA COM NEW 171779309 30,849 -7,588 -19.74 728 -22.39 0.0076
2017-05-08 2017-03-31 13F/A-1 CIENA COM NEW 171779309 30,849 0 728 0.0076
2017-04-25 2017-03-31 13F CIENA COM NEW 171779309 30,849 728
2017-02-13 2016-12-31 13F CIENA COM NEW 171779309 38,437 11,962 45.18 938 62.56 0.0104
2016-11-10 2016-09-30 13F CIENA COM NEW 171779309 26,475 -5,406 -16.96 577 -3.51 0.0081
2016-08-12 2016-06-30 13F CIENA COM NEW 171779309 31,881 1,554 5.12 598 3.64 0.0077
2016-05-06 2016-03-31 13F CIENA COM NEW 171779309 30,327 -3,002 -9.01 577 -16.38 0.0079
2016-02-05 2015-12-31 13F CIENA COM NEW 171779309 33,329 8,688 35.26 690 35.03 0.0084
2015-11-06 2015-09-30 13F CIENA COM NEW 171779309 24,641 -8,337 -25.28 511 -34.57 0.0072
2015-08-11 2015-06-30 13F CIENA COM NEW 171779309 32,978 -5,240 -13.71 781 5.83 0.0108
2015-05-08 2015-03-31 13F CIENA COM NEW 171779309 38,218 38,218 0.00 738 0.0087
2015-01-30 2014-12-31 13F CIENA COM NEW 171779309 0 -99,385 -100.00 0 -100.00
2014-11-06 2014-09-30 13F CIENA COM NEW 171779309 99,385 -2,419 -2.38 1,662 -24.63 0.0220
2014-08-08 2014-06-30 13F CIENA COM NEW 171779309 101,804 -14,677 -12.60 2,205 -16.76 0.0286
2014-05-07 2014-03-31 13F CIENA COM NEW 171779309 116,481 31,720 37.42 2,649 30.62 0.0331
2014-02-04 2013-12-31 13F CIENA COM NEW 171779309 84,761 9,913 13.24 2,028 8.45 0.0302
2013-11-07 2013-09-30 13F CIENA COM NEW 171779309 74,848 1,901 2.61 1,870 31.97 0.0444
2013-07-25 2013-06-30 13F CIENA COM NEW 171779309 72,947 72,947 1,417 0.0278
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.