Calamos Global Total Return Fund

SecurityCGO / Calamos Global Total Return Fund
InstitutionMorgan Stanley
Latest Disclosed Ownership450,851 shares
Latest Disclosed Value $ 5,027,006
Morgan Stanley reports 3.48% increase in ownership of CGO / Calamos Global Total Return Fund

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 450,851 shares of Calamos Global Total Return Fund (US:CGO) valued at $5,026,989 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 435,670 shares of Calamos Global Total Return Fund. This represents a change in shares of 3.48% during the quarter. The current value of the position is $6,343,474 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 GLOBAL TOTAL RETURN COM SH BEN INT 128118106 450,851 15,181 3.48 5,027 1.31 0.0003
2026-05-27 2025-12-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 435,670 10,777 2.54 4,962 -2.99 0.0003
2026-02-13 2025-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 435,670 10,777 4,962 0.0003
2026-05-27 2025-09-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 424,893 25,286 6.33 5,116 9.32 0.0003
2025-11-14 2025-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 424,893 25,286 5,116 0.0003
2025-08-15 2025-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 399,607 24,841 6.63 4,679 20.87 0.0003
2025-05-15 2025-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 374,766 -5,895 -1.55 3,871 -10.70 0.0003
2025-05-15 2024-12-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 380,661 -5,678 -1.47 4,336 -6.09 0.0003
2025-02-14 2024-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 380,661 -5,678 4,336 0.0003
2025-05-14 2024-09-30 13F/A-2 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 386,339 5,052 1.32 4,617 9.28 0.0003
2025-02-14 2024-09-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 386,339 5,052 4,617 0.0003
2024-11-14 2024-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 386,339 5,052 4,617 0.0000
2025-05-14 2024-06-30 13F/A-2 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 381,287 9,336 2.51 4,225 9.20 0.0003
2024-10-17 2024-06-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 381,287 9,336 4,225 0.0003
2024-08-14 2024-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 381,287 9,336 4,225 0.0003
2024-10-17 2024-03-31 13F/A-2 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 371,951 27,961 8.13 3,868 23.86 0.0003
2024-08-16 2024-03-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 371,951 27,961 3,868 0.0000
2024-05-15 2024-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 371,951 27,961 3,868 0.0003
2024-08-16 2023-12-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 343,990 31,396 10.04 3,123 14.19 0.0003
2024-02-13 2023-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 343,990 31,396 3,123 0.0003
2023-11-15 2023-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 312,594 39,517 14.47 2,736 3.29 0.0003
2023-08-14 2023-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 273,077 -8,729 -3.10 2,649 0.00 0.0003
2023-05-15 2023-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 281,806 21,466 8.25 2,649 15.23 0.0003
2023-02-14 2022-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 260,340 -28,799 -9.96 2,299 -19.03 0.0003
2022-11-14 2022-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 289,139 21,197 7.91 2,838 -0.28 0.0004
2022-10-27 2022-06-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 267,942 -4,220 -1.55 2,846 -27.38 0.0004
2022-08-15 2022-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 267,942 -4,220 2,846 0.0001
2022-10-27 2022-03-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 272,162 27,855 11.40 3,919 4.31 0.0005
2022-05-13 2022-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 272,162 27,855 3,919 0.0005
2022-02-14 2021-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 244,307 -1,795 -0.73 3,757 -3.99 0.0005
2021-11-15 2021-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 246,102 1,174 0.48 3,913 -1.39 0.0005
2021-08-23 2021-06-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 244,928 37,733 18.21 3,968 28.62 0.0005
2021-08-16 2021-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 244,928 37,733 3,968 0.0001
2021-05-17 2021-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 207,195 11,662 5.96 3,085 7.57 0.0005
2021-02-16 2020-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 195,533 -11,053 -5.35 2,868 17.06 0.0004
2020-11-13 2020-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 206,586 6,142 3.06 2,450 7.79 0.0005
2020-08-14 2020-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 200,444 19,075 10.52 2,273 37.84 0.0005
2020-05-26 2020-03-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 181,369 2,611 1.46 1,649 -31.15 0.0004
2020-05-15 2020-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 181,369 2,611 1,649 126.6776
2020-02-14 2019-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 178,758 5,592 3.23 2,395 14.21 0.0006
2019-11-14 2019-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 173,166 22,483 14.92 2,097 8.32 0.0006
2019-08-14 2019-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 150,683 25,299 20.18 1,936 26.29 0.0005
2019-05-15 2019-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 125,384 -1,678 -1.32 1,533 18.75 0.0004
2019-02-14 2018-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 127,062 -28,215 -18.17 1,291 -40.40 0.0004
2019-04-23 2018-09-30 13F/A-2 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 155,277 -1,012 -0.65 2,166 -2.04 0.0005
2018-11-20 2018-09-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 155,277 0 2,166 0.0005
2018-11-14 2018-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 155,277 -1,012 2,166
2019-04-23 2018-06-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 156,289 9,725 6.64 2,211 4.24 0.0006
2018-08-14 2018-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 156,289 9,725 2,211
2019-04-23 2018-03-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 146,564 27,773 23.38 2,121 18.56 0.0006
2018-05-14 2018-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 146,564 27,773 2,121
2019-04-23 2017-12-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 118,791 7,277 6.53 1,789 19.59 0.0005
2018-02-14 2017-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 118,791 7,277 1,789
2017-11-14 2017-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 111,514 6,235 5.92 1,496 7.78 0.0004
2017-08-11 2017-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 105,279 2,733 2.67 1,388 12.66 0.0004
2017-05-22 2017-03-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 102,546 -2,011 -1.92 1,232 11.90 0.0004
2017-05-12 2017-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 102,546 1,232
2017-02-22 2016-12-31 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 104,557 -3,656 -3.38 1,101 -11.07 0.0004
2017-02-13 2016-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 104,557 1,101
2016-11-10 2016-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 108,213 7,503 7.45 1,238 12.85 0.0004
2016-08-12 2016-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 100,710 -4,437 -4.22 1,097 -5.76 0.0004
2016-05-12 2016-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 105,147 -3,937 -3.61 1,164 -6.58 0.0004
2016-02-09 2015-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 109,084 -1,831 -1.65 1,246 0.81 0.0005
2016-02-08 2015-09-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 110,915 -6,690 -5.69 1,236 -21.62 0.0005
2015-11-09 2015-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 110,915 1,236
2015-08-12 2015-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 117,605 21,526 22.40 1,577 21.49 0.0005
2015-05-14 2015-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 96,079 13,564 16.44 1,298 18.97 0.0005
2015-02-13 2014-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 82,515 11,412 16.05 1,091 10.54 0.0004
2014-12-16 2014-09-30 13F/A-1 CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 71,103 17,733 33.23 987 24.46 0.0004
2014-11-14 2014-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 71,103 987
2014-08-12 2014-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 53,370 -3,632 -6.37 793 -6.71 0.0014
2014-05-13 2014-03-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 57,002 -3,767 -6.20 850 -0.23 0.0004
2014-02-13 2013-12-31 13F CALAMOS GLOBAL TOTAL RETURN COM SH BEN INT 128118106 60,769 -5,434 -8.21 852 -4.38 0.0004
2013-11-13 2013-09-30 13F CALAMOS GLOBAL TOTAL RETURN COM 128118106 66,203 -10,157 -13.30 891 -12.65 0.0004
2013-08-08 2013-06-30 13F CALAMOS GLOBAL TOTAL RETURN COM 128118106 76,360 76,360 1,020 0.0005
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.