# EDGAR Filing Document

**Accession Number:** 0000319676
**File Stem:** 0001076598-25-000424
**Filing Date:** 2025-9
**Character Count:** 2601
**Document Hash:** cbe83e508ca3aa7cb8c6d19fd86cf15b
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001076598-25-000424.hdr.sgml**: 20250910

**ACCESSION NUMBER**: 0001076598-25-000424

**CONFORMED SUBMISSION TYPE**: 497

**PUBLIC DOCUMENT COUNT**: 16

**FILED AS OF DATE**: 20250910

**DATE AS OF CHANGE**: 20250910

**EFFECTIVENESS DATE**: 20250910

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Calvert Management Series
- **CENTRAL INDEX KEY:** 0000319676

**ORGANIZATION NAME:**
- **EIN:** 526211999
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** 497
- **SEC ACT:** 1933 Act
- **SEC FILE NUMBER:** 002-69565
- **FILM NUMBER:** 251305515

**BUSINESS ADDRESS:**
- **STREET 1:** 2050 M STREET NW
- **CITY:** WASHINGTON
- **STATE:** DC
- **ZIP:** 20036
- **BUSINESS PHONE:** 8002256265

**MAIL ADDRESS:**
- **STREET 1:** 2050 M STREET NW
- **CITY:** WASHINGTON
- **STATE:** DC
- **ZIP:** 20036

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** CALVERT TAX FREE RESERVES
- **DATE OF NAME CHANGE:** 19920703

## Series and Classes Contracts Data

### Calvert Flexible Bond Fund (Series ID: S000046839)

---

|  |  |  |
|:---|:---|:---|
| Class Name                          | Ticker Symbol | Class ID   |
| CLASS A                             | CUBAX         | C000146359 |
| CLASS C                             | CUBCX         | C000146360 |
| CLASS I                             | CUBIX         | C000146362 |
| Calvert Flexible Bond Fund Class R6 | CUBRX         | C000213138 |

---

## Series and Classes Contracts Data

### Calvert Flexible Bond Fund (Series ID: S000046839)

| Class ID   | Class Name                          | Ticker Symbol   |
|:---|:---|:---|
| C000146359 | CLASS A                             | CUBAX           |
| C000146360 | CLASS C                             | CUBCX           |
| C000146362 | CLASS I                             | CUBIX           |
| C000213138 | Calvert Flexible Bond Fund Class R6 | CUBRX           |

?xml version='1.0' encoding='ASCII'? CALVERT MANAGEMENT SERIES - Form 497 SEC filing

**CALVERT FLEXIBLE BOND FUND**

**Supplement to Prospectus dated May 1, 2025**

**as may be supplemented and/or revised from time to time**

**The following change is effective immediately:**

**The following replaces the fifth paragraph in "Principal Investment Strategies" under "Fund Summary":**

Under normal circumstances, the average portfolio duration of the Fund will vary from zero (0) years to positive six (6) years. Average portfolio duration will vary depending on the portfolio managers' outlook on changing market, economic, and political conditions.

September 10, 2025 48646-00 9.10.25