Ciena Corporation
US ˙ NYSE ˙ US1717793095

SecurityCIEN / Ciena Corporation
InstitutionCwm, Llc
Latest Disclosed Ownership44,569 shares
Latest Disclosed Value $ 17,302,844
Cwm, Llc reports 6.30% decrease in ownership of CIEN / Ciena Corporation

On May 14, 2026 - Cwm, Llc filed a 13F-HR form disclosing ownership of 44,569 shares of Ciena Corporation (US:CIEN) valued at $17,303,023 USD as of March 31, 2026. The entity filed a previous 13F-HR on January 26, 2026 disclosing 47,566 shares of Ciena Corporation. This represents a change in shares of -6.30% during the quarter. The current value of the position is $27,649,271 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)
2026-05-14 2026-03-31 13F CIENA COM NEW 171779309 44,569 -2,997 -6.30 17,303 157,190.91 0.0450
2026-01-26 2025-12-31 13F CIENA COM NEW 171779309 47,566 1,718 3.75 11 83.33 0.0301
2025-10-15 2025-09-30 13F CIENA COM NEW 171779309 45,848 19,899 76.69 7 200.00 0.0201
2025-07-25 2025-06-30 13F CIENA COM NEW 171779309 25,949 3,491 15.54 2 100.00 0.0074
2025-05-01 2025-03-31 13F CIENA COM NEW 171779309 22,458 -60 -0.27 1 0.00 0.0054
2025-02-04 2024-12-31 13F CIENA COM NEW 171779309 22,518 -981 -4.17 2 0.00 0.0079
2024-10-08 2024-09-30 13F CIENA COM NEW 171779309 23,499 12,938 122.51 1 0.0062
2024-07-10 2024-06-30 13F CIENA COM NEW 171779309 10,561 9,239 698.87 1 0.0024
2024-04-05 2024-03-31 13F CIENA COM NEW 171779309 1,322 -97 -6.84 0 0.0003
2024-02-01 2023-12-31 13F CIENA COM NEW 171779309 1,419 41 2.98 0 0.0003
2023-10-11 2023-09-30 13F CIENA COM NEW 171779309 1,378 -229 -14.25 0 0.0004
2023-08-03 2023-06-30 13F CIENA COM NEW 171779309 1,607 -91 -5.36 0 0.0004
2023-05-01 2023-03-31 13F CIENA COM NEW 171779309 1,698 -553 -24.57 0 0.0006
2023-02-01 2022-12-31 13F CIENA COM NEW 171779309 2,251 -893 -28.40 0 -100.00 0.0008
2022-10-27 2022-09-30 13F CIENA COM NEW 171779309 3,144 849 36.99 127 20.95 0.0010
2022-07-28 2022-06-30 13F CIENA COM NEW 171779309 2,295 -40 -1.71 105 -26.06 0.0008
2022-04-21 2022-03-31 13F CIENA COM NEW 171779309 2,335 136 6.18 142 -15.98 0.0010
2022-01-31 2021-12-31 13F CIENA COM NEW 171779309 2,199 75 3.53 169 39.67 0.0012
2021-09-15 2021-06-30 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2021-07-29 2021-06-30 13F CIENA COM NEW 171779309 2,124 0 121 0.0010
2021-09-15 2021-03-31 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2021-04-27 2021-03-31 13F CIENA COM NEW 171779309 2,377 253 130 0.0011
2021-09-15 2020-12-31 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2021-01-27 2020-12-31 13F CIENA COM NEW 171779309 1,321 -803 70 0.0007
2021-09-15 2020-09-30 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2020-10-19 2020-09-30 13F CIENA COM NEW 171779309 155,803 153,679 6,184 0.0688
2021-09-15 2020-06-30 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2020-07-22 2020-06-30 13F CIENA COM NEW 171779309 164,547 162,423 8,912 0.1057
2021-09-15 2020-03-31 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2020-04-28 2020-03-31 13F CIENA COM NEW 171779309 187,909 185,785 7,481 0.1114
2021-09-14 2019-12-31 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2020-01-27 2019-12-31 13F CIENA COM NEW 171779309 200,491 198,367 8,559 0.1094
2021-09-14 2019-09-30 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2019-10-22 2019-09-30 13F CIENA COM NEW 171779309 195,017 192,893 7,651 0.1114
2021-09-14 2019-06-30 13F/A-1 CIENA COM NEW 171779309 2,124 0 0.00 121 0.00 0.0010
2019-07-31 2019-06-30 13F CIENA COM NEW 171779309 178,975 176,851 7,361 0.1218
2021-09-02 2019-03-31 13F/A-1 CIENA COM NEW 171779309 2,124 -114,609 -98.18 121 -96.94 0.0010
2019-04-22 2019-03-31 13F CIENA COM NEW 171779309 140,653 23,920 5,252 0.1053
2019-01-25 2018-12-31 13F CIENA COM NEW 171779309 116,733 13,864 13.48 3,958 23.15 0.0988
2018-10-29 2018-09-30 13F CIENA COM NEW 171779309 102,869 29,388 39.99 3,214 64.99 0.0821
2018-07-31 2018-06-30 13F CIENA COM NEW 171779309 73,481 5,052 7.38 1,948 9.93 0.0641
2018-04-26 2018-03-31 13F CIENA COM NEW 171779309 68,429 15 0.02 1,772 23.74 0.0704
2018-01-16 2017-12-31 13F CIENA COM NEW 171779309 68,414 -3,506 -4.87 1,432 -9.37 0.0636
2017-10-16 2017-09-30 13F CIENA COM NEW 171779309 71,920 71,751 42,456.21 1,580 39,400.00 0.0747
2017-07-17 2017-06-30 13F CIENA COM NEW 171779309 169 -3 -1.74 4 0.00 0.0002
2017-04-17 2017-03-31 13F CIENA COM NEW 171779309 172 172 4 0.0002
2016-10-17 2016-09-30 13F CIENA COM NEW 171779309 0 -128 -100.00 0 -100.00
2016-07-21 2016-06-30 13F CIENA COM NEW 171779309 128 0 0.00 2 0.00 0.0001
2016-04-18 2016-03-31 13F CIENA COM NEW 171779309 128 0 0.00 2 -33.33 0.0002
2016-02-01 2015-12-31 13F CIENA COM NEW 171779309 128 0 0.00 3 0.00 0.0003
2015-10-30 2015-09-30 13F CIENA COM NEW 171779309 128 0 0.00 3 0.00 0.0003
2014-02-14 2013-12-31 13F CIENA COM NEW 171779309 128 0 0.00 3 0.00 0.0005
2013-11-14 2013-09-30 13F CIENA COM NEW 171779309 128 128 3 0.0008
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.