Calamos Strategic Total Return Fund
US ˙ NasdaqGS ˙ US1281251017

SecurityCSQ / Calamos Strategic Total Return Fund
InstitutionMorgan Stanley
Latest Disclosed Ownership4,366,213 shares
Latest Disclosed Value $ 74,749,606
Morgan Stanley reports 3.68% increase in ownership of CSQ / Calamos Strategic Total Return Fund

On May 15, 2026 - Morgan Stanley filed a 13F-HR form disclosing ownership of 4,366,213 shares of Calamos Strategic Total Return Fund (US:CSQ) valued at $74,749,567 USD as of March 31, 2026. The entity filed a previous 13F-HR/A on May 27, 2026 disclosing 4,211,288 shares of Calamos Strategic Total Return Fund. This represents a change in shares of 3.68% during the quarter. The current value of the position is $90,162,298 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 STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,366,213 154,925 3.68 74,750 -7.55 0.0045
2026-05-27 2025-12-31 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,211,288 -89,146 -2.07 80,857 -2.53 0.0048
2026-02-13 2025-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,211,288 -89,146 80,857 0.0048
2026-05-27 2025-09-30 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,300,434 94,498 2.25 82,955 8.13 0.0050
2025-11-14 2025-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,300,434 94,498 82,955 0.0050
2025-08-15 2025-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,205,936 -7,114 -0.17 76,716 12.54 0.0050
2025-05-15 2025-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,213,050 -134,993 -3.10 68,167 -11.47 0.0049
2025-05-15 2024-12-31 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,348,043 129,226 3.06 77,004 5.20 0.0054
2025-02-14 2024-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,348,043 129,226 77,004 0.0054
2025-05-14 2024-09-30 13F/A-2 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,218,817 297,389 7.58 73,196 10.84 0.0053
2025-02-14 2024-09-30 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,218,817 297,389 73,196 0.0053
2024-11-14 2024-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 4,218,817 297,389 73,196 0.0006
2025-05-14 2024-06-30 13F/A-2 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,921,428 43,190 1.11 66,037 4.02 0.0051
2024-10-17 2024-06-30 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,921,428 43,190 66,037 0.0051
2024-08-14 2024-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,921,428 43,190 66,037 0.0051
2024-10-17 2024-03-31 13F/A-2 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,878,238 23,510 0.61 63,487 10.76 0.0051
2024-08-16 2024-03-31 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,878,238 23,510 63,487 0.0006
2024-05-15 2024-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,878,238 23,510 63,487 0.0051
2024-08-16 2023-12-31 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,854,728 43,327 1.14 57,320 6.89 0.0051
2024-02-13 2023-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,854,728 43,327 57,320 0.0051
2023-11-15 2023-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,811,401 -14,006 -0.37 53,626 -4.96 0.0055
2023-08-14 2023-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,825,407 -87,831 -2.24 56,425 2.99 0.0056
2023-05-15 2023-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,913,238 145,705 3.87 54,785 8.36 0.0059
2023-02-14 2022-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,767,533 143,613 3.96 50,560 11.61 0.0057
2022-11-14 2022-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,623,920 96,220 2.73 45,299 -2.05 0.0062
2022-10-27 2022-06-30 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,527,700 -275,221 -7.24 46,248 -30.63 0.0060
2022-08-15 2022-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,527,700 -275,221 46,248 0.0012
2022-10-27 2022-03-31 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,802,921 152,145 4.17 66,665 -5.34 0.0090
2022-05-13 2022-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,802,921 152,145 66,665 0.0090
2022-02-14 2021-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,650,776 153,051 4.38 70,424 13.62 0.0087
2021-11-15 2021-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,497,725 86,223 2.53 61,980 -0.12 0.0083
2021-08-23 2021-06-30 13F/A-1 CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,411,502 85,716 2.58 62,055 8.29 0.0082
2021-08-16 2021-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,411,502 85,716 62,055 0.0017
2021-05-17 2021-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 3,325,786 156,604 4.94 57,303 14.51 0.0084
2021-02-16 2020-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,169,182 47,010 1.51 50,041 19.08 0.0077
2020-11-13 2020-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,122,172 -38,250 -1.21 42,024 6.97 0.0081
2020-08-14 2020-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,160,422 34,278 1.10 39,284 28.62 0.0087
2020-05-26 2020-03-31 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,126,144 -107,846 -3.33 30,542 -30.56 0.0083
2020-05-15 2020-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,126,144 -107,846 30,542 2,346.2623
2020-02-14 2019-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,233,990 173,018 5.65 43,982 12.96 0.0102
2019-11-14 2019-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,060,972 71,301 2.38 38,936 2.07 0.0103
2019-08-14 2019-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,989,671 -117,172 -3.77 38,148 -0.90 0.0102
2019-05-15 2019-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,106,843 86,173 2.85 38,494 20.34 0.0109
2019-02-14 2018-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,020,670 27,046 0.90 31,989 -20.49 0.0096
2019-04-23 2018-09-30 13F/A-2 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,993,624 -51,070 -1.68 40,234 4.30 0.0101
2018-11-20 2018-09-30 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,993,624 0 40,234 0.0101
2018-11-14 2018-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,993,624 -51,070 40,234
2019-04-23 2018-06-30 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,044,694 70,783 2.38 38,576 9.65 0.0104
2018-08-14 2018-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 3,044,694 70,783 38,576
2019-04-23 2018-03-31 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,973,911 271,102 10.03 35,182 7.75 0.0098
2018-05-14 2018-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,973,911 271,102 35,182
2019-04-23 2017-12-31 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,702,809 34,012 1.27 32,650 0.86 0.0089
2018-02-14 2017-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,702,809 34,012 32,650
2017-11-14 2017-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,668,797 60,928 2.34 32,373 5.74 0.0097
2017-08-11 2017-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,607,869 65,103 2.56 30,617 7.89 0.0092
2017-05-22 2017-03-31 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,542,766 -117,664 -4.42 28,378 3.86 0.0087
2017-05-12 2017-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,542,766 28,378
2017-02-22 2016-12-31 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,660,430 269,044 11.25 27,323 11.15 0.0089
2017-02-13 2016-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,660,430 27,323
2016-11-10 2016-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,391,386 170,852 7.69 24,583 12.05 0.0084
2016-08-12 2016-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,220,534 -19,190 -0.86 21,939 3.00 0.0079
2016-05-12 2016-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,239,724 -297,813 -11.74 21,299 -15.21 0.0082
2016-02-09 2015-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,537,537 394,453 18.41 25,121 26.19 0.0091
2016-02-08 2015-09-30 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,143,084 -1,827 -0.09 19,908 -15.39 0.0074
2015-11-09 2015-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,143,084 19,908
2015-08-12 2015-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,144,911 174,825 8.87 23,530 6.12 0.0082
2015-05-14 2015-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 1,970,086 -69,953 -3.43 22,174 -4.99 0.0082
2015-02-13 2014-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,040,039 -67,133 -3.19 23,338 -5.34 0.0085
2014-12-16 2014-09-30 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,107,172 17,740 0.85 24,654 -1.75 0.0095
2014-11-14 2014-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,107,172 24,654
2014-08-12 2014-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,089,432 -294,008 -12.34 25,094 -5.32 0.0429
2014-05-13 2014-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,383,440 320,917 15.56 26,503 18.00 0.0111
2014-02-13 2013-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 2,062,523 643,090 45.31 22,461 58.24 0.0096
2013-11-13 2013-09-30 13F CALAMOS STRATEGIC TOTAL RET COM 128125101 1,419,433 -118,452 -7.70 14,194 -8.98 0.0067
2013-08-08 2013-06-30 13F CALAMOS STRATEGIC TOTAL RET COM 128125101 1,537,885 1,537,885 15,595 0.0079
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.