Ciena Corporation
MX ˙ BMV ˙ US1717793095
SecurityMX:CIEN / Ciena Corporation
InstitutionPathstone Holdings, LLC
Latest Disclosed Ownership18,566 shares
Latest Disclosed Value $ 7,207,992
Pathstone Holdings, LLC reports 11.93% increase in ownership of CIEN / Ciena Corporation

On May 11, 2026 - Pathstone Holdings, LLC filed a 13F-HR form disclosing ownership of 18,566 shares of Ciena Corporation (MX:CIEN) valued at $7,207,992 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 16,587 shares of Ciena Corporation. This represents a change in shares of 11.93% 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)
2026-05-11 2026-03-31 13F CIENA COM NEW 171779309 18,566 1,979 11.93 7,208 85.80 0.0155
2026-02-13 2025-12-31 13F CIENA COM NEW 171779309 16,587 -611 -3.55 3,879 54.85 0.0150
2025-11-13 2025-09-30 13F CIENA COM NEW 171779309 17,198 658 3.98 2,505 86.25 0.0096
2025-08-12 2025-06-30 13F CIENA COM NEW 171779309 16,540 1,693 11.40 1,345 49.94 0.0053
2025-05-15 2025-03-31 13F CIENA COM NEW 171779309 14,847 1,377 10.22 898 -21.45 0.0039
2025-02-14 2024-12-31 13F CIENA COM NEW 171779309 13,470 -1,249 -8.49 1,142 26.05 0.0050
2024-11-07 2024-09-30 13F CIENA COM NEW 171779309 14,719 551 3.89 907 32.84 0.0040
2024-08-14 2024-06-30 13F CIENA COM NEW 171779309 14,168 357 2.58 683 0.00 0.0031
2024-05-13 2024-03-31 13F CIENA COM NEW 171779309 13,811 1,319 10.56 683 21.35 0.0032
2024-02-14 2023-12-31 13F CIENA COM NEW 171779309 12,492 12,492 562 0.0030
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.