Ciena Corporation
US ˙ NYSE ˙ US1717793095

SecurityCIEN / Ciena Corporation
InstitutionKBC Group NV
Latest Disclosed Ownership57,143 shares
Latest Disclosed Value $ 22,185
KBC Group NV reports 83.38% increase in ownership of CIEN / Ciena Corporation

On May 7, 2026 - KBC Group NV filed a 13F-HR form disclosing ownership of 57,143 shares of Ciena Corporation (US:CIEN) valued at $22,184,627 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 31,161 shares of Ciena Corporation. This represents a change in shares of 83.38% during the quarter. The current value of the position is $35,449,803 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)
2026-05-07 2026-03-31 13F CIENA COM NEW 171779309 57,143 25,982 83.38 22 214.29 0.0286
2026-01-26 2025-12-31 13F CIENA COM NEW 171779309 31,161 3,156 11.27 7 75.00 0.0166
2026-01-20 2025-09-30 13F CIENA COM NEW 171779309 28,005 0 0.00 4 100.00 0.0098
2025-08-08 2025-06-30 13F CIENA COM NEW 171779309 28,005 -2,034 -6.77 2 100.00 0.0062
2025-04-25 2025-03-31 13F CIENA COM NEW 171779309 30,039 -18 -0.06 2 -50.00 0.0056
2025-01-22 2024-12-31 13F CIENA COM NEW 171779309 30,057 -20,104 -40.08 3 -33.33 0.0070
2024-11-06 2024-09-30 13F CIENA COM NEW 171779309 50,161 488 0.98 3 50.00 0.0093
2024-07-17 2024-06-30 13F CIENA COM NEW 171779309 49,673 433 0.88 2 0.00 0.0072
2024-05-08 2024-03-31 13F CIENA COM NEW 171779309 49,240 517 1.06 2 0.00 0.0077
2024-02-13 2023-12-31 13F CIENA COM NEW 171779309 48,723 334 0.69 2 0.00 0.0078
2024-02-15 2023-09-30 13F/A-1 CIENA COM NEW 171779309 48,389 2,343 5.09 2 100.00 0.0093
2023-11-22 2023-09-30 13F CIENA COM NEW 171779309 46,046 0 2 0.0081
2024-02-15 2023-06-30 13F/A-1 CIENA COM NEW 171779309 46,046 0 0.00 2 -50.00 0.0080
2023-07-28 2023-06-30 13F CIENA COM NEW 171779309 46,046 0 2 0.0081
2024-02-14 2023-03-31 13F/A-1 CIENA COM NEW 171779309 46,046 -35,140 -43.28 2 -50.00 0.0103
2023-05-04 2023-03-31 13F CIENA COM NEW 171779309 46,046 -32,270 2 0.0114
2024-02-14 2022-12-31 13F/A-1 CIENA COM NEW 171779309 81,186 2,870 3.66 4 33.33 0.0201
2023-02-13 2022-12-31 13F CIENA COM NEW 171779309 78,316 0 3 0.0000
2024-02-15 2022-09-30 13F/A-1 CIENA COM NEW 171779309 78,316 32,270 70.08 3 50.00 0.0165
2022-11-08 2022-09-30 13F CIENA COM NEW 171779309 78,316 32,270 3,166 0.0165
2024-02-14 2022-06-30 13F/A-1 CIENA COM NEW 171779309 46,046 -5,883 -11.33 2 -33.33 0.0105
2022-07-26 2022-06-30 13F CIENA COM NEW 171779309 46,046 -5,883 2,104 0.0106
2024-02-14 2022-03-31 13F/A-1 CIENA COM NEW 171779309 51,929 -2,813 -5.14 3 -25.00 0.0124
2022-05-06 2022-03-31 13F CIENA COM NEW 171779309 51,929 -2,813 3,148 0.0116
2024-02-14 2021-12-31 13F/A-1 CIENA COM NEW 171779309 54,742 9,525 21.07 4 -99.83 0.0139
2022-02-03 2021-12-31 13F CIENA COM NEW 171779309 54,742 9,525 4,213 0.0132
2021-11-10 2021-09-30 13F CIENA COM NEW 171779309 45,217 -65,086 -59.01 2,322 -63.00 0.0085
2022-02-15 2021-06-30 13F/A-1 CIENA COM NEW 171779309 110,303 -7,193 -6.12 6,275 -2.40 0.0226
2021-08-11 2021-06-30 13F CIENA COM NEW 171779309 110,303 -7,193 6,275 0.0226
2022-02-14 2021-03-31 13F/A-1 CIENA COM NEW 171779309 117,496 928 0.80 6,429 -89.56 0.0260
2021-04-26 2021-03-31 13F CIENA COM NEW 171779309 117,496 928 6,429 0.0260
2022-02-14 2020-12-31 13F/A-1 CIENA COM NEW 171779309 116,568 33,621 40.53 61,606 1,771.39 0.0290
2021-02-10 2020-12-31 13F CIENA COM NEW 171779309 116,568 33,621 6,161 0.0284
2022-02-14 2020-09-30 13F/A-1 CIENA COM NEW 171779309 82,947 61,473 286.27 3,292 183.06 0.0194
2020-10-28 2020-09-30 13F CIENA COM NEW 171779309 82,947 61,473 3,292 0.0195
2022-02-14 2020-06-30 13F/A-1 CIENA COM NEW 171779309 21,474 21,474 1,163 0.0077
2020-08-10 2020-06-30 13F CIENA COM NEW 171779309 21,474 21,474 1,163 0.0078
2018-11-14 2018-09-30 13F CIENA COM NEW 171779309 0 -2,092 -100.00 0 -100.00
2018-08-03 2018-06-30 13F CIENA COM NEW 171779309 2,092 -269 -11.39 55 -9.84 0.0005
2018-08-03 2018-03-31 13F/A-1 CIENA COM NEW 171779309 2,361 2,361 61 0.0006
2018-05-09 2018-03-31 13F CIENA COM NEW 171779309 2,361 61 0.0006
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.