EATON VANCE CORE BOND FUND
(the “Fund”)
Supplement to Summary Prospectus, Statutory Prospectus and
Statement of Additional Information (“SAI”) dated May 1, 2026
as
may be supplemented and/or revised from time to time
The following changes are effective immediately:
1. The following replaces “Portfolio Managers” under “Management” in “Fund Summary” in the Fund’s Summary Prospectus and Statutory Prospectus:
Portfolio Managers
| Name | Title | Date Began Managing Fund/Portfolio |
| Brian S. Ellis, CFA | Managing Director of Morgan Stanley and Vice President of Eaton Vance and BMR | March 2021/June 2017 |
| Vishal Khanduja, CFA | Managing Director of Morgan Stanley and Vice President of Eaton Vance and BMR | March 2021/June 2017 |
| Mihir Shah, CFA | Vice President of Morgan Stanley and Vice President of Eaton Vance and BMR | October 19, 2026/October 19, 2026 |
2. The following replaces the eighth paragraph under “Management” in “Management and Organization” under “Details of the Fund” in the Fund’s Statutory Prospectus:
Vishal Khanduja, CFA and Brian S. Ellis, CFA have served as portfolio managers of the Portfolio since June 2017 and of the Fund since March 2021. Mihir Shah, CFA has served as a portfolio manager of the Fund and of the Portfolio since October 19, 2026. Messrs. Khanduja and Ellis are Managing Directors of Morgan Stanley and Vice Presidents of EVM and BMR, manage other funds and portfolios and have been employed by the Morgan Stanley organization for more than five years. Mr. Shah is a Vice President of Morgan Stanley and a Vice President of EVM and BMR. Prior to joining Morgan Stanley in 2025, Mr. Shah served in a variety of roles across the investment industry, most recently as a Portfolio Analyst for Wellington Management since 2014.
3. The following replaces the tables under “Portfolio Manager(s).” in “Investment Advisory and Administrative Services” in the Fund’s SAI:
| Number
of All Accounts |
Total
Assets of All Accounts |
Number
of Accounts Paying a Performance Fee |
Total
Assets of Accounts Paying a Performance Fee | |
| Brian S. Ellis, CFA1 | ||||
| Registered Investment Companies2 | 21 | $28,886.0 | 0 | $0 |
| Other Pooled Investment Vehicles | 2 | $230.0 | 0 | $0 |
| Other Accounts | 30 | $10,708.4 | 1 | $544.3 |
| Vishal Khanduja, CFA1 | ||||
| Registered Investment Companies2 | 16 | $26,610.4 | 0 | $0 |
| Other Pooled Investment Vehicles | 13 | $9,289.8 | 0 | $0 |
| Other Accounts | 46 | $11,760.6 | 6 | $2,951.8 |
| Mihir Shah, CFA3 | ||||
| Registered Investment Companies2 | 0 | $0 | 0 | $0 |
| Other Pooled Investment Vehicles | 0 | $0 | 0 | $0 |
| Other Accounts | 2 | $46.7 | 0 | $0 |
| 1 | This portfolio manager serves as portfolio manager of one or more registered investment companies that invests or may invest in one or more underlying registered investment companies in the Eaton Vance family of funds or other pooled investment vehicles sponsored by Eaton Vance. The underlying investment companies may be managed by this portfolio manager or another portfolio manager. |
| 2 | Includes the Fund and Portfolio. |
| 3 | As of August 31, 2026. |
| Portfolio Managers | Dollar
Range of Equity Securities Beneficially Owned in the Fund |
Aggregate
Dollar Range of Equity Securities Beneficially Owned in the Eaton Vance Family of Funds |
| Brian S. Ellis, CFA | None | $500,001 - $1,000,000 |
| Vishal Khanduja, CFA | None | $500,001 - $1,000,000 |
| Mihir Shah, CFA1 | None | $50,001 - $100,000 |
| 1 | As of August 31, 2026. |
| October 19, 2026 | 48703-00 10.19.26 |
| 2 |