MDBYX — MassMutual Diversified Bond Fund
Data updated: 2026-05-27
MDBYX — MassMutual Diversified Bond Fund data: holdings, portfolio allocation, expenses, performance, cashflows, risk and SEC filings. Long Total / Aggregate Bond · $68.75M AUM · 0.79% expense ratio · 6.4% 1-yr return. From SEC regulatory filings.
MDBYX Fund Overview
MDBYX — MassMutual Diversified 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: $68.75M
- 1-year return: 6.4%
- Ticker: MDBYX
- SEC CIK: 0000927972
- SEC series ID: S000003793
- Share class ID: C000010557
MDBYX Holdings
Top 10 holdings of MassMutual Diversified Bond Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| United States Treasury | 2.89% |
| New Residential Mortgage Loan Trust | 1.89% |
| State Street Global Advisors | 1.65% |
| Fannie Mae | 1.52% |
| Fidus Re Ltd. | 1.31% |
| Fannie Mae | 1.18% |
| Perrigo Finance Unlimite | 0.94% |
| Freddie Mac | 0.93% |
| Uniti Group/csl Capital | 0.89% |
| Ellington Financial Mortgage Trust | 0.87% |
MDBYX Portfolio Allocation
Asset-class allocation of MassMutual Diversified Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 66.4% |
| Securitized | 34.5% |
| Cash & Equivalents | 2.3% |
| Equity | 0.3% |
| Real Estate | 0.2% |
MDBYX Performance
Total returns for MDBYX (as of 2026-08-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 0.3% |
| 1 year | 6.4% |
| 3 years (annualised) | 5.8% |
| 5 years (annualised) | 0.8% |
MDBYX Risk Information
Risk metrics for MDBYX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 2.9%
MDBYX Costs and Fees
MDBYX costs about $79 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.79%
- Gross expense ratio: 0.92%
- Portfolio turnover: 265%
- Brokerage commissions: 0.54 bps of average net assets (SEC N-CEN)
MDBYX Cashflows
Over the 12 months to 2026-03, MassMutual Diversified Bond Fund had net outflows of $56.43M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-03 | −$1.34M |
| 2026-02 | $88.12K |
| 2026-01 | $511.07K |
| 2025-12 | −$289.01K |
| 2025-11 | $862.95K |
| 2025-10 | −$79.39K |
MDBYX Debt Constituents
Largest debt holdings of MassMutual Diversified Bond Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| United States Treasury | 2.89% |
| Fidus Re Ltd. | 1.31% |
| Perrigo Finance Unlimite | 0.94% |
| Uniti Group/csl Capital | 0.89% |
| Hilcorp Energy I/hilcorp | 0.86% |
| Service Properties Trust | 0.78% |
| Ggam Finance Ltd. | 0.74% |
| American National Group | 0.74% |
| Brightstar Lot/brighstar | 0.69% |
| Nexstar Media, Inc. | 0.66% |
MDBYX Prospectus and SEC Filings
Official MassMutual Diversified 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.