MCBDX — MassMutual Core Bond Fund
Data updated: 2026-05-27
MCBDX — MassMutual Core Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $843.89M AUM · 0.43% expense ratio · 5.0% 1-yr return. From SEC regulatory filings.
MCBDX Fund Overview
MCBDX — MassMutual Core Bond Fund is a US mutual fund managed by Massmutual Premier Funds, categorised as Long Total / Aggregate Bond. ABC INVEST provides holdings, performance, costs, cashflows, risk data, prospectus documents and SEC filings, sourced from SEC filings.
- Type: US mutual fund
- Manager: Massmutual Premier Funds
- Category: Long Total / Aggregate Bond
- Assets under management: $843.89M
- 1-year return: 5.0%
- Ticker: MCBDX
- SEC CIK: 0000927972
- SEC series ID: S000003791
- Share class ID: C000010546
MCBDX Holdings
Top 10 holdings of MassMutual Core Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| Umbs, Tba | 2.13% |
| Freddie Mac | 2.07% |
| United States Treasury | 1.99% |
| United States Treasury | 1.88% |
| United States Treasury | 1.81% |
| United States Treasury | 1.71% |
| Umbs, Tba | 1.52% |
| Umbs, Tba | 1.46% |
| State Street Global Advisors | 1.32% |
| Amrize Finance US LLC | 1.30% |
MCBDX Portfolio Allocation
Asset-class allocation of MassMutual Core Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 52.2% |
| Securitized | 49.0% |
| Cash & Equivalents | 5.5% |
MCBDX Performance
Total returns for MCBDX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | -0.2% |
| 1 year | 5.0% |
| 3 years (annualised) | 5.1% |
| 5 years (annualised) | 0.8% |
MCBDX Risk Information
Risk metrics for MCBDX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 3.5%
MCBDX Costs and Fees
MCBDX costs about $43 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.43%
- Gross expense ratio: 0.45%
- Portfolio turnover: 149%
- Brokerage commissions: 0.48 bps of average net assets (SEC N-CEN)
MCBDX Cashflows
Over the 12 months to 2026-03, MassMutual Core Bond Fund had net inflows of $46.66M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | $25.84M |
| 2026-02 | −$16.54M |
| 2026-01 | $3.40M |
| 2025-12 | −$32.96M |
| 2025-11 | $7.17M |
| 2025-10 | $3.64M |
MCBDX Debt Constituents
Largest debt holdings of MassMutual Core Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury | 1.99% |
| United States Treasury | 1.88% |
| United States Treasury | 1.81% |
| United States Treasury | 1.71% |
| United States Treasury | 1.22% |
| United States Treasury | 0.80% |
| Fidus Re Ltd. | 0.71% |
| Corebridge Financial, Inc. | 0.61% |
| Enstar Finance LLC | 0.51% |
| Antares Holdings | 0.50% |
MCBDX Prospectus and SEC Filings
Official MassMutual Core Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
Related Funds
Other Long Total / Aggregate Bond funds tracked on ABC INVEST:
Data Sources
ABC INVEST compiles this page from public filings made to the U.S. Securities and Exchange Commission (SEC) through EDGAR: portfolio holdings and monthly cashflows from Form N-PORT, expenses and returns from fund prospectuses (Form 485BPOS) and the SEC DERA Risk/Return Summary data sets, annual data from Form N-CEN, and shareholder reports from Form N-CSR.