Ciena Corporation
US ˙ NYSE ˙ US1717793095

SecurityCIEN / Ciena Corporation
InstitutionMorgan Stanley
Latest Disclosed Ownership1,561,554 shares
Latest Disclosed Value $ 606,243,238
Morgan Stanley reports 12.75% increase in ownership of CIEN / Ciena Corporation

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,561,554 shares of Ciena Corporation (US:CIEN) valued at $606,242,109 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,384,972 shares of Ciena Corporation. This represents a change in shares of 12.75% during the quarter. The current value of the position is $762,366,278 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)
2026-05-15 2026-03-31 13F CIENA COM NEW 171779309 1,561,554 176,582 12.75 606,243 87.17 0.0365
2026-05-27 2025-12-31 13F/A-1 CIENA COM NEW 171779309 1,384,972 -356,903 -20.49 323,904 27.65 0.0193
2026-02-13 2025-12-31 13F CIENA COM NEW 171779309 1,384,972 -356,903 323,904 0.0193
2026-05-27 2025-09-30 13F/A-1 CIENA COM NEW 171779309 1,741,875 -128,205 -6.86 253,739 66.83 0.0154
2025-11-14 2025-09-30 13F CIENA COM NEW 171779309 1,741,875 -128,205 253,739 0.0154
2025-08-15 2025-06-30 13F CIENA COM NEW 171779309 1,870,080 336,526 21.94 152,094 64.12 0.0099
2025-05-15 2025-03-31 13F CIENA COM NEW 171779309 1,533,554 47,551 3.20 92,673 -26.47 0.0066
2025-05-15 2024-12-31 13F/A-1 CIENA COM NEW 171779309 1,486,003 312,729 26.65 126,028 74.40 0.0088
2025-02-14 2024-12-31 13F CIENA COM NEW 171779309 1,486,003 312,729 126,028 0.0088
2025-05-14 2024-09-30 13F/A-2 CIENA COM NEW 171779309 1,173,274 -133,068 -10.19 72,262 14.81 0.0052
2025-02-14 2024-09-30 13F/A-1 CIENA COM NEW 171779309 1,173,274 -133,068 72,262 0.0052
2024-11-14 2024-09-30 13F CIENA COM NEW 171779309 1,173,274 -133,068 72,262 0.0006
2025-05-14 2024-06-30 13F/A-2 CIENA COM NEW 171779309 1,306,342 -268,741 -17.06 62,940 -19.19 0.0049
2024-10-17 2024-06-30 13F/A-1 CIENA COM NEW 171779309 1,306,342 -268,741 62,940 0.0049
2024-08-14 2024-06-30 13F CIENA COM NEW 171779309 1,306,342 -268,741 62,940 0.0049
2024-10-17 2024-03-31 13F/A-2 CIENA COM NEW 171779309 1,575,083 224,233 16.60 77,888 28.10 0.0062
2024-08-16 2024-03-31 13F/A-1 CIENA COM NEW 171779309 1,575,083 224,233 77,888 0.0007
2024-05-15 2024-03-31 13F CIENA COM NEW 171779309 1,575,083 224,233 77,888 0.0063
2024-08-16 2023-12-31 13F/A-1 CIENA COM NEW 171779309 1,350,850 -31,520 -2.28 60,802 -6.93 0.0054
2024-02-13 2023-12-31 13F CIENA COM NEW 171779309 1,350,850 -31,520 60,802 0.0054
2023-11-15 2023-09-30 13F CIENA COM NEW 171779309 1,382,370 439,584 46.63 65,331 63.08 0.0066
2023-08-14 2023-06-30 13F CIENA COM NEW 171779309 942,786 -67,211 -6.65 40,059 -24.48 0.0039
2023-05-15 2023-03-31 13F CIENA COM NEW 171779309 1,009,997 -152,988 -13.15 53,045 -10.53 0.0057
2023-02-14 2022-12-31 13F CIENA COM NEW 171779309 1,162,985 118,566 11.35 59,289 40.41 0.0067
2022-11-14 2022-09-30 13F CIENA COM NEW 171779309 1,044,419 120,882 13.09 42,225 0.05 0.0058
2022-10-27 2022-06-30 13F/A-1 CIENA COM NEW 171779309 923,537 264,615 40.16 42,205 5.64 0.0055
2022-08-15 2022-06-30 13F CIENA COM NEW 171779309 923,537 264,615 42,205 0.0055
2022-10-27 2022-03-31 13F/A-1 CIENA COM NEW 171779309 658,922 -596,427 -47.51 39,950 -58.65 0.0054
2022-05-13 2022-03-31 13F CIENA COM NEW 171779309 658,922 -596,427 39,950 0.0054
2022-02-14 2021-12-31 13F CIENA COM NEW 171779309 1,255,349 141,589 12.71 96,625 68.95 0.0119
2021-11-15 2021-09-30 13F CIENA COM NEW 171779309 1,113,760 -115,206 -9.37 57,191 -18.20 0.0077
2021-08-23 2021-06-30 13F/A-1 CIENA COM NEW 171779309 1,228,966 267,539 27.83 69,915 32.90 0.0092
2021-08-16 2021-06-30 13F CIENA COM NEW 171779309 1,228,966 267,539 69,915 0.0019
2021-05-17 2021-03-31 13F CIENA COM NEW 171779309 961,427 -86,673 -8.27 52,609 -5.02 0.0077
2021-02-16 2020-12-31 13F CIENA COM NEW 171779309 1,048,100 479,087 84.20 55,392 145.27 0.0086
2020-11-13 2020-09-30 13F CIENA COM NEW 171779309 569,013 -214,528 -27.38 22,584 -46.78 0.0044
2020-08-14 2020-06-30 13F CIENA COM NEW 171779309 783,541 329,056 72.40 42,437 134.55 0.0094
2020-05-26 2020-03-31 13F/A-1 CIENA COM NEW 171779309 454,485 107,972 31.16 18,093 22.31 0.0049
2020-05-15 2020-03-31 13F CIENA COM NEW 171779309 454,485 107,972 18,093 1,389.9196
2020-02-14 2019-12-31 13F CIENA COM NEW 171779309 346,513 86,375 33.20 14,793 44.94 0.0034
2019-11-14 2019-09-30 13F CIENA COM NEW 171779309 260,138 -444,001 -63.06 10,206 -64.76 0.0027
2019-08-14 2019-06-30 13F CIENA COM NEW 171779309 704,139 -931,191 -56.94 28,960 -52.57 0.0077
2019-05-15 2019-03-31 13F CIENA COM NEW 171779309 1,635,330 213,561 15.02 61,063 26.66 0.0173
2019-02-14 2018-12-31 13F CIENA COM NEW 171779309 1,421,769 115,804 8.87 48,212 18.17 0.0144
2019-04-23 2018-09-30 13F/A-2 CIENA COM NEW 171779309 1,305,965 489,275 59.91 40,799 88.45 0.0102
2018-11-20 2018-09-30 13F/A-1 CIENA COM NEW 171779309 1,305,965 0 40,799 0.0102
2018-11-14 2018-09-30 13F CIENA COM NEW 171779309 1,305,965 489,275 40,799
2019-04-23 2018-06-30 13F/A-1 CIENA COM NEW 171779309 816,690 -314,375 -27.79 21,650 -26.10 0.0058
2018-08-14 2018-06-30 13F CIENA COM NEW 171779309 816,690 -314,375 21,650
2019-04-23 2018-03-31 13F/A-1 CIENA COM NEW 171779309 1,131,065 355,830 45.90 29,295 80.55 0.0081
2018-05-14 2018-03-31 13F CIENA COM NEW 171779309 1,131,065 355,830 29,295
2019-04-23 2017-12-31 13F/A-1 CIENA COM NEW 171779309 775,235 124,524 19.14 16,225 13.49 0.0044
2018-02-14 2017-12-31 13F CIENA COM NEW 171779309 775,235 124,524 16,225
2017-11-14 2017-09-30 13F CIENA COM NEW 171779309 650,711 -268,420 -29.20 14,296 -37.84 0.0043
2017-08-11 2017-06-30 13F CIENA COM NEW 171779309 919,131 335,969 57.61 22,998 67.03 0.0069
2017-05-22 2017-03-31 13F/A-1 CIENA COM NEW 171779309 583,162 -469,491 -44.60 13,769 -46.41 0.0042
2017-05-12 2017-03-31 13F CIENA COM NEW 171779309 583,162 13,769
2017-02-22 2016-12-31 13F/A-1 CIENA COM NEW 171779309 1,052,653 710,967 208.08 25,695 244.99 0.0084
2017-02-13 2016-12-31 13F CIENA COM NEW 171779309 1,052,653 25,695
2016-11-10 2016-09-30 13F CIENA COM NEW 171779309 341,686 -240,566 -41.32 7,448 -31.79 0.0025
2016-08-12 2016-06-30 13F CIENA COM NEW 171779309 582,252 518,614 814.94 10,919 801.65 0.0039
2016-05-12 2016-03-31 13F CIENA COM NEW 171779309 63,638 -212,726 -76.97 1,211 -78.82 0.0005
2016-02-09 2015-12-31 13F CIENA COM NEW 171779309 276,364 -270,949 -49.51 5,719 -49.57 0.0021
2016-02-08 2015-09-30 13F/A-1 CIENA COM NEW 171779309 547,313 226,030 70.35 11,340 49.05 0.0042
2015-11-09 2015-09-30 13F CIENA COM NEW 171779309 547,313 11,340
2015-08-12 2015-06-30 13F CIENA COM NEW 171779309 321,283 161,287 100.81 7,608 146.29 0.0026
2015-05-14 2015-03-31 13F CIENA COM NEW 171779309 159,996 -35,095 -17.99 3,089 -18.41 0.0011
2015-02-13 2014-12-31 13F CIENA COM NEW 171779309 195,091 -378,209 -65.97 3,786 -60.50 0.0014
2014-12-16 2014-09-30 13F/A-1 CIENA COM NEW 171779309 573,300 258,736 82.25 9,584 40.67 0.0037
2014-11-14 2014-09-30 13F CIENA COM NEW 171779309 573,300 9,584
2014-08-12 2014-06-30 13F CIENA COM NEW 171779309 314,564 -176,523 -35.95 6,813 -38.99 0.0117
2014-05-13 2014-03-31 13F CIENA COM NEW 171779309 491,087 169,494 52.70 11,167 45.10 0.0047
2014-02-13 2013-12-31 13F CIENA COM NEW 171779309 321,593 -257,502 -44.47 7,696 -46.86 0.0033
2013-11-13 2013-09-30 13F CIENA CORP COM ST COM 171779309 579,095 366,362 172.22 14,483 250.42 0.0068
2013-08-08 2013-06-30 13F CIENA CORP COM ST COM 171779309 212,733 212,733 4,133 0.0021
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.