Calamos Convertible Opportunities and Income Fund
US ˙ NasdaqGS ˙ US1281171082

SecurityCHI / Calamos Convertible Opportunities and Income Fund
InstitutionMorgan Stanley
Latest Disclosed Ownership1,413,476 shares
Latest Disclosed Value $ 15,180,732
Morgan Stanley reports 1.19% increase in ownership of CHI / Calamos Convertible Opportunities and Income Fund

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 1,413,476 shares of Calamos Convertible Opportunities and Income Fund (US:CHI) valued at $15,180,732 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 1,396,889 shares of Calamos Convertible Opportunities and Income Fund. This represents a change in shares of 1.19% during the quarter. The current value of the position is $17,993,549 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 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,413,476 16,587 1.19 15,181 3.70 0.0009
2026-05-27 2025-12-31 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,396,889 -35,761 -2.50 14,639 -5.30 0.0009
2026-02-13 2025-12-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,396,889 -35,761 14,639 0.0009
2026-05-27 2025-09-30 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,432,650 8,323 0.58 15,458 3.17 0.0009
2025-11-14 2025-09-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,432,650 8,323 15,458 0.0009
2025-08-15 2025-06-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,424,327 -51,476 -3.49 14,984 5.87 0.0010
2025-05-15 2025-03-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,475,803 102,853 7.49 14,153 -13.67 0.0010
2025-05-15 2024-12-31 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,372,950 34,419 2.57 16,393 5.22 0.0011
2025-02-14 2024-12-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,372,950 34,419 16,393 0.0011
2025-05-14 2024-09-30 13F/A-2 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,338,531 44,072 3.40 15,581 3.40 0.0011
2025-02-14 2024-09-30 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,338,531 44,072 15,581 0.0011
2024-11-14 2024-09-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,338,531 44,072 15,581 0.0001
2025-05-14 2024-06-30 13F/A-2 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,294,459 -36,351 -2.73 15,068 -0.24 0.0012
2024-10-17 2024-06-30 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,294,459 -36,351 15,068 0.0012
2024-08-14 2024-06-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,294,459 -36,351 15,068 0.0012
2024-10-17 2024-03-31 13F/A-2 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,330,810 -72,988 -5.20 15,105 3.86 0.0012
2024-08-16 2024-03-31 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,330,810 -72,988 15,105 0.0001
2024-05-15 2024-03-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,330,810 -72,988 15,105 0.0012
2024-08-16 2023-12-31 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,403,798 -96,977 -6.46 14,543 -8.06 0.0013
2024-02-13 2023-12-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,403,798 -96,977 14,543 0.0013
2023-11-15 2023-09-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,500,775 20,249 1.37 15,818 -4.60 0.0016
2023-08-14 2023-06-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,480,526 25,817 1.77 16,582 8.35 0.0016
2023-05-15 2023-03-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,454,709 37,191 2.62 15,304 2.72 0.0016
2023-02-14 2022-12-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,417,518 26,529 1.91 14,898 10.87 0.0017
2022-11-14 2022-09-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,390,989 8,088 0.58 13,437 -9.36 0.0018
2022-10-27 2022-06-30 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,382,901 89,204 6.90 14,825 -13.25 0.0019
2022-08-15 2022-06-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,382,901 89,204 14,825 0.0004
2022-10-27 2022-03-31 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,293,697 -75,676 -5.53 17,090 -17.41 0.0023
2022-05-13 2022-03-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,293,697 -75,676 17,090 0.0023
2022-02-14 2021-12-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,369,373 65,573 5.03 20,692 6.01 0.0026
2021-11-15 2021-09-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,303,800 8,801 0.68 19,518 -0.65 0.0026
2021-08-23 2021-06-30 13F/A-1 CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,294,999 -25,834 -1.96 19,646 4.60 0.0026
2021-08-16 2021-06-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,294,999 -25,834 19,646 0.0005
2021-05-17 2021-03-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,320,833 -88,160 -6.26 18,782 -1.55 0.0028
2021-02-16 2020-12-31 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,408,993 43,125 3.16 19,078 26.98 0.0029
2020-11-13 2020-09-30 13F CALAMOS CONV OPPORTUNITIES SH BEN INT 128117108 1,365,868 8,590 0.63 15,025 4.04 0.0029
2020-08-14 2020-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,357,278 213,887 18.71 14,442 51.45 0.0032
2020-05-26 2020-03-31 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,143,391 -6,868 -0.60 9,536 -24.63 0.0026
2020-05-15 2020-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,143,391 -6,868 9,536 732.5636
2020-02-14 2019-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,150,259 -41,051 -3.45 12,653 2.02 0.0029
2019-11-14 2019-09-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,191,310 216 0.02 12,402 -0.88 0.0033
2019-08-14 2019-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,191,094 -27,502 -2.26 12,512 1.21 0.0033
2019-05-15 2019-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,218,596 48,618 4.16 12,362 19.26 0.0035
2019-02-14 2018-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,169,978 31,591 2.78 10,366 -24.37 0.0031
2019-04-23 2018-09-30 13F/A-2 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,138,387 3,652 0.32 13,706 2.45 0.0034
2018-11-20 2018-09-30 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,138,387 0 13,706 0.0034
2018-11-14 2018-09-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,138,387 3,652 13,706
2019-04-23 2018-06-30 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,134,735 53,131 4.91 13,378 11.43 0.0036
2018-08-14 2018-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,134,735 53,131 13,378
2019-04-23 2018-03-31 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,081,604 -21,062 -1.91 12,006 -2.70 0.0033
2018-05-14 2018-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,081,604 -21,062 12,006
2019-04-23 2017-12-31 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,102,666 -46,540 -4.05 12,339 -6.88 0.0034
2018-02-14 2017-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,102,666 -46,540 12,339
2017-11-14 2017-09-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,149,206 -137,416 -10.68 13,250 -8.55 0.0040
2017-08-11 2017-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,286,622 11,748 0.92 14,488 3.31 0.0044
2017-05-22 2017-03-31 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,274,874 -175,897 -12.12 14,024 -4.20 0.0043
2017-05-12 2017-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,274,874 14,024
2017-02-22 2016-12-31 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,450,771 -124,559 -7.91 14,639 -10.04 0.0048
2017-02-13 2016-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,450,771 14,639
2016-11-10 2016-09-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,575,330 21,140 1.36 16,273 6.52 0.0056
2016-08-12 2016-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,554,190 -84,437 -5.15 15,277 -1.76 0.0055
2016-05-12 2016-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,638,627 -236,552 -12.61 15,551 -16.32 0.0060
2016-02-09 2015-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,875,179 404,460 27.50 18,583 27.76 0.0067
2016-02-08 2015-09-30 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,470,719 -177,957 -10.79 14,545 -27.74 0.0054
2015-11-09 2015-09-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,470,719 14,545
2015-08-12 2015-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,648,676 -38,615 -2.29 20,130 -8.09 0.0070
2015-05-14 2015-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,687,291 147,263 9.56 21,901 10.76 0.0081
2015-02-13 2014-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,540,028 95,832 6.64 19,774 1.20 0.0072
2014-12-16 2014-09-30 13F/A-1 CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,444,196 -8,388 -0.58 19,540 -4.12 0.0075
2014-11-14 2014-09-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,444,196 19,540
2014-08-12 2014-06-30 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,452,584 166,211 12.92 20,380 14.72 0.0349
2014-05-13 2014-03-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,286,373 123,273 10.60 17,765 15.19 0.0074
2014-02-13 2013-12-31 13F CALAMOS CONV OPP AND INC FD SH BEN INT 128117108 1,163,100 -50,505 -4.16 15,423 0.86 0.0066
2013-11-13 2013-09-30 13F CALAMOS CONVERTIBLE OPPORTU COM 128117108 1,213,605 -97,028 -7.40 15,291 -7.48 0.0072
2013-08-08 2013-06-30 13F CALAMOS CONVERTIBLE OPPORTU COM 128117108 1,310,633 1,310,633 16,527 0.0083
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.