Market price, NAV and premium/discount
Premium/discount statistics
| Window | Average | Std. dev. | Z-score | Observations | Minimum sample |
|---|---|---|---|---|---|
| 3 months | -9.33% | 0.84% | -1.76 | 64 | 40 |
| 6 months | -9.95% | 1.11% | -0.79 | 126 | 80 |
| 1 year | -9.46% | 1.17% | -1.17 | 249 | 160 |
| 3 years | -6.91% | — | — | — | 500 |
| 5 years | -4.48% | — | — | — | 900 |
How to read this. Premium/discount = (price ÷ NAV − 1) × 100; negative is a discount. Averages and standard deviations use daily pairs where a closing price and a NAV were both published for the same date — NAV is never forward-filled. Z = (current − window average) ÷ window standard deviation, suppressed below the minimum sample or when the standard deviation is zero. A discount does not guarantee convergence to NAV or a profitable investment; a negative Z-score describes a wider-than-usual discount for this fund, not undervaluation.
Premium/discount and NAV per share as reported in SEC filings
| Period end | Form | NAV / share | Share price | Reported prem/disc | Source |
|---|---|---|---|---|---|
| Apr 30, 2026 | N-CSRS | $14.40 | $12.85 | — | EDGAR filing |
| Oct 31, 2025 | N-CSRS | $13.11 | $11.96 | — | EDGAR filing |
| Oct 31, 2024 | N-CSRS | $11.80 | $11.66 | — | EDGAR filing |
| Oct 31, 2023 | N-CSRS | $9.12 | $8.15 | — | EDGAR filing |
| Oct 31, 2022 | N-CSRS | $9.59 | $9.12 | — | EDGAR filing |
| Oct 31, 2021 | N-CSRS | $15.82 | $15.86 | — | EDGAR filing |
| Oct 31, 2020 | N-CSRS | $11.99 | — | — | EDGAR filing |
Inline XBRL facts tagged by the fund (cef: and us-gaap: taxonomies). These are the fund's own reported figures for the stated dates.
CEF Explorer research page for Calamos Global Total Return Fund. Figures carry their own dates and sources; a discount to NAV does not guarantee convergence or any return. This is not investment advice.