시에나 주식회사
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionTocqueville Asset Management L.p.
Latest Disclosed Ownership598 shares
Latest Disclosed Value $ 232,162
Tocqueville Asset Management L.p. ownership in CIEN / Ciena Corporation

On May 12, 2026 - Tocqueville Asset Management L.p. filed a 13F-HR form disclosing ownership of 598 shares of Ciena Corporation (MX:CIEN) valued at $232,162 USD as of March 31, 2026. The entity filed a previous 13F-HR on May 15, 2020 disclosing 0 shares of Ciena Corporation.

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 NEW 171779309 598 598 232 0.0034
2020-05-15 2020-03-31 13F Ciena COM 171779309 0 -200,190 -100.00 0 -100.00
2020-01-14 2019-12-31 13F Ciena COM 171779309 200,190 -464 -0.23 8,546 8.56 0.1257
2019-10-31 2019-09-30 13F Ciena COM 171779309 200,654 0 0.00 7,872 -4.62 0.1068
2019-07-31 2019-06-30 13F Ciena COM 171779309 200,654 0 0.00 8,253 10.16 0.1069
2019-04-30 2019-03-31 13F Ciena COM 171779309 200,654 40 0.02 7,492 10.13 0.1000
2019-02-08 2018-12-31 13F Ciena COM 171779309 200,614 -5,436 -2.64 6,803 5.69 0.1019
2018-11-13 2018-09-30 13F Ciena COM 171779309 206,050 -35,000 -14.52 6,437 0.74 0.0811
2018-08-13 2018-06-30 13F Ciena COM 171779309 241,050 0 0.00 6,390 2.35 0.0811
2018-05-14 2018-03-31 13F Ciena COM 171779309 241,050 -158,750 -39.71 6,243 -25.39 0.0795
2018-02-13 2017-12-31 13F Ciena COM 171779309 399,800 399,800 8,368 0.0950
2017-01-30 2016-12-31 13F Ciena COM 171779309 0 -9,500 -100.00 0 -100.00
2016-10-31 2016-09-30 13F Ciena COM 171779309 9,500 9,500 207 0.0025
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.