Calamos Strategic Total Return Fund
US ˙ NasdaqGS ˙ US1281251017

SecurityCSQ / Calamos Strategic Total Return Fund
InstitutionStifel Financial Corp
Latest Disclosed Ownership388,535 shares
Latest Disclosed Value $ 6,651,760
Stifel Financial Corp reports 1.15% decrease in ownership of CSQ / Calamos Strategic Total Return Fund

On May 12, 2026 - Stifel Financial Corp filed a 13F-HR form disclosing ownership of 388,535 shares of Calamos Strategic Total Return Fund (US:CSQ) valued at $6,651,719 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 393,041 shares of Calamos Strategic Total Return Fund. This represents a change in shares of -1.15% during the quarter. The current value of the position is $8,023,248 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-12 2026-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 388,535 -4,506 -1.15 6,652 -11.86 0.0014
2026-02-13 2025-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 393,041 11,803 3.10 7,546 2.61 0.0068
2025-11-12 2025-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 381,238 -1,566 -0.41 7,354 5.33 0.0067
2025-08-14 2025-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 382,804 102,745 36.69 6,982 54.09 0.0068
2025-05-14 2025-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 280,059 -1,813 -0.64 4,531 -9.22 0.0048
2025-02-13 2024-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 281,872 31,870 12.75 4,992 15.08 0.0052
2024-11-14 2024-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 250,002 -8,750 -3.38 4,338 -0.46 0.0045
2024-08-13 2024-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 258,752 -12,497 -4.61 4,357 -1.87 0.0049
2024-05-14 2024-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 271,249 -468 -0.17 4,440 9.90 0.0051
2024-02-12 2023-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 271,717 75,838 38.72 4,040 46.59 0.0051
2023-11-13 2023-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 195,879 -6,708 -3.31 2,756 -7.76 0.0039
2023-08-14 2023-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 202,587 5,994 3.05 2,988 8.58 0.0041
2023-05-12 2023-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 196,593 4,454 2.32 2,752 6.75 0.0039
2023-02-13 2022-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 192,139 -21,004 -9.85 2,579 -3.23 0.0039
2022-11-14 2022-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 213,143 -2,063 -0.96 2,664 -5.57 0.0044
2022-08-15 2022-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 215,206 23,424 12.21 2,821 -16.09 0.0044
2022-05-13 2022-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 191,782 -3,750 -1.92 3,362 -10.87 0.0046
2022-02-14 2021-12-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 195,532 3,921 2.05 3,772 11.07 0.0050
2021-11-15 2021-09-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 191,611 -9,604 -4.77 3,396 -7.21 0.0050
2021-08-13 2021-06-30 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 201,215 5,963 3.05 3,660 8.80 0.0055
2021-05-14 2021-03-31 13F CALAMOS STRATEGIC TOTAL RETU COM SH BEN INT 128125101 195,252 8,740 4.69 3,364 14.23 0.0055
2021-02-12 2020-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 186,512 39,285 26.68 2,945 48.66 0.0053
2020-11-16 2020-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 147,227 -5,733 -3.75 1,981 4.21 0.0041
2020-08-14 2020-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 152,960 -8,466 -5.24 1,901 20.24 0.0044
2020-05-14 2020-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 161,426 -60,041 -27.11 1,581 -47.46 0.0044
2020-02-13 2019-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 221,467 -101,588 -31.45 3,009 -26.72 0.0063
2019-11-19 2019-09-30 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 323,055 7,103 2.25 4,106 1.89 0.0105
2019-11-13 2019-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 322,532 6,580 4,099 2,297.6950
2019-08-14 2019-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 315,952 -48,141 -13.22 4,030 -10.66 0.0104
2019-05-14 2019-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 364,093 -38,003 -9.45 4,511 5.94 0.0127
2019-02-13 2018-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 402,096 -250,614 -38.40 4,258 -51.44 0.0138
2018-11-13 2018-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 652,710 10,656 1.66 8,769 7.87 0.0251
2018-08-14 2018-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 642,054 97,323 17.87 8,129 26.29 0.0249
2018-05-11 2018-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 544,731 121,405 28.68 6,437 25.92 0.0203
2018-02-14 2017-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 423,326 -226,938 -34.90 5,112 -35.18 0.0162
2017-11-13 2017-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 650,264 -19,473 -2.91 7,887 0.29 0.0274
2017-08-14 2017-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 669,737 -109,326 -14.03 7,864 -9.53 0.0292
2017-05-10 2017-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 779,063 -72,266 -8.49 8,692 -0.64 0.0337
2017-02-16 2016-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 851,329 -206,785 -19.54 8,748 -19.61 0.0371
2016-11-15 2016-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 1,058,114 90,726 9.38 10,882 13.84 0.0489
2016-08-17 2016-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 967,388 100,476 11.59 9,559 15.94 0.0442
2016-05-16 2016-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 866,912 343,630 65.67 8,245 59.14 0.0439
2016-03-21 2015-12-31 13F/A-2 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 523,282 474,241 967.03 5,181 1,038.68 0.0270
2016-02-26 2015-12-31 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 474,745 -48,537 4,700 0.0246
2016-02-16 2015-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 411,596 4,075
2015-11-16 2015-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 49,041 -6,090 -11.05 455 -24.79 0.0026
2015-08-17 2015-06-30 13F/A-1 CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 55,131 11,870 27.44 605 24.23 0.0031
2015-08-17 2015-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 55,131 605
2015-05-14 2015-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 43,261 26,340 155.66 487 152.33 0.0027
2015-02-13 2014-12-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 16,921 808 5.01 193 2.12 0.0011
2014-11-13 2014-09-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 16,113 -401 -2.43 189 -4.55 0.0017
2014-08-14 2014-06-30 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 16,514 -1,100 -6.25 198 1.02 0.0018
2014-05-15 2014-03-31 13F CALAMOS STRATEGIC TOTL RETN COM SH BEN INT 128125101 17,614 17,614 196 0.0019
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.