MMCAX — MassMutual Core Bond Fund
Data updated: 2026-08-27
MMCAX — MassMutual Core Bond Fund. Long Total / Aggregate Bond · $846.76M AUM · 0.05% expense ratio. Holdings, fees, performance and SEC filings.
MMCAX Fund Overview
MMCAX — 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: $846.76M
- Ticker: MMCAX
- SEC CIK: 0000927972
- SEC series ID: S000003791
- Share class ID: C000271053
MMCAX Investment Objective and Strategy
MassMutual Core Bond Fund describes its objective and strategy as follows, from its latest prospectus filed with the SEC by Massmutual Premier Funds.
Investment objective
This Fund seeks to achieve a high total rate of return consistent with prudent investment risk and the preservation of capital by investing primarily in a diversified portfolio of investment grade fixed income securities.
Principal investment strategy
Under normal circumstances, the Fund invests at least 80% of its net assets (plus the amount of any borrowings for investment purposes) in investment grade fixed income securities (rated Baa3 or higher by Moodys, BBB- or higher by Standard & Poors or the equivalent by any NRSRO, or, if unrated, determined to be of comparable quality by the subadviser). These typically include U.S. dollar-denominated corporate obligations, securities issued or guaranteed by the U.S. Government or its agencies or instrumentalities, U.S. and foreign issuer dollar-denominated bonds including, but not limited to, corporate obligations, government and agency issues, private placement bonds, securities subject to resale pursuant to Rule 144A, and mortgage-backed and other asset-backed securities, including collateralized bond and loan obligations.
The Fund may invest up to 10% of its total assets in below investment grade debt securities (junk or high yield bonds), including securities in default, and including bank loans. In the event that a security is downgraded after its purchase by the Fund, the Fund may continue to hold the security if the Funds subadviser, Barings LLC (Barings), considers that doing so would be consistent with the Funds investment objective. The Fund may invest up to 15% of its total assets in securities that are not denominated in U.S. dollars including, but not limited to, corporate obligations, government and agency issues, private placement bonds, and mortgage-backed and other asset-backed securities, including collateralized bond and loan obligations. The Fund may also invest in non-dollar denominated high yield bonds, including bank loans, and may invest in securities subject to legal restrictions on resale, some of which may be subject to resale pursuant to Rule 144A.
In pursuing its investment objective, the Fund may (but is not obligated to) use a wide variety of exchange-traded and over-the-counter derivatives, including, but not limited to, futures contracts, foreign currency futures and forward contracts, including derivatives thereof (for hedging purposes, to adjust various portfolio characteristics, including the duration (interest rate volatility) of the Funds portfolio, or as a substitute for direct investments); interest rate swaps (for hedging purposes or as a substitute for direct investments); total return swaps (for hedging purposes or to gain exposure to securities or markets in which it might not be able to invest directly); and credit default swaps (for hedging purposes or as a substitute for direct investments). The Fund may invest in common stocks, ETFs, or other equity securities and derivatives thereof for hedging purposes or to enhance total return.
Use of derivatives by the Fund may create investment leverage. The Fund may invest in money market securities, including commercial paper. The Fund may enter into repurchase agreement transactions. The Fund may hold a portion of its assets in cash or cash equivalents. The Fund may enter into dollar roll or reverse repurchase agreement transactions. The Fund may invest in (i) securities denominated in currencies of emerging market countries, (ii) fixed income securities or debt instruments issued by emerging market entities or sovereign nations and/or (iii) debt instruments denominated in or based on the currencies, interest rates, or issues of emerging market countries. Emerging market countries are defined to include any country that did not become a member of the Organization for Economic Cooperation and Development (O.E.C.D.) prior to 1975 and Turkey.
The Fund may invest in other investment companies, including investment companies that are advised by the Funds investment adviser, subadviser or its affiliates, or by unaffiliated parties. Barings intends for the Funds portfolio dollar-weighted average duration generally to match (within 10%) the average duration of the Bloomberg Barclays U.S. Aggregate Bond Index (as of December 31, 2017, the average duration of the Index was 5.78 years). Duration measures the price sensitivity of a bond to changes in interest rates. Duration is the dollar weighted average time to maturity of a bond utilizing the present value of all future cash flows. Barings selects the Funds investments based on its analysis of opportunities and risks of various fixed income securities and market sectors. Currently, Barings may consider the following factors (which may change over time and in particular cases): the perceived potential for high income offered by different types of corporate and government obligations (including mortgage-backed and other asset-backed securities); diversification among industries and issuers, credit ratings, and sectors; and the relative values offered by different securities.
Barings may choose to sell securities with deteriorating credit or limited upside potential compared to other securities. The Fund expects that it will engage in active and frequent trading and so will typically have a relatively high portfolio turnover rate.
MMCAX 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 | 3.63% |
| Freddie Mac | 2.00% |
| United States Treasury | 1.98% |
| United States Treasury | 1.79% |
| United States Treasury | 1.69% |
| Umbs, Tba | 1.45% |
| State Street Global Advisors | 1.35% |
| EIDP Inc | 1.18% |
| Becton Dickinson & Co | 1.18% |
| United States Treasury | 1.16% |
MMCAX 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 | 50.7% |
| Securitized | 47.1% |
| Cash & Equivalents | 9.2% |
| Real Estate | 0.2% |
MMCAX Performance
Total returns for MMCAX (as of 2026-10-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 1.1% |
| 1 year | 4.7% |
| 3 years (annualised) | 5.5% |
| 5 years (annualised) | 0.1% |
MMCAX Risk Information
Risk metrics for MMCAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 2.9%
MMCAX Costs and Fees
MMCAX costs about $5 per $10,000 invested per year in fund expenses.
- Net expense ratio: 0.05%
- Gross expense ratio: 0.35%
- Portfolio turnover: 149%
- Brokerage commissions: 0.48 bps of average net assets (SEC N-CEN)
MMCAX Cashflows
Over the 12 months to 2026-06, MassMutual Core Bond Fund had net inflows of $58.84M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | −$3.36M |
| 2026-05 | $6.97M |
| 2026-04 | −$3.99M |
| 2026-03 | $25.84M |
| 2026-02 | −$16.54M |
| 2026-01 | $3.40M |
MMCAX 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 | 1.98% |
| United States Treasury | 1.79% |
| United States Treasury | 1.69% |
| United States Treasury | 1.16% |
| Fidus Re Ltd. | 0.70% |
| United States Treasury | 0.69% |
| Corebridge Financial, Inc. | 0.62% |
| Allianz SE | 0.60% |
| Enstar Finance LLC | 0.60% |
| Antares Holdings | 0.50% |
MMCAX Prospectus and SEC Filings
Official MassMutual Core Bond Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-01-30
- Prospectus (485BPOS) — filed 2025-01-31
- Prospectus supplement (497) — filed 2025-09-23
- Portfolio holdings (N-PORT) — filed 2026-08-27
- Portfolio holdings (N-PORT) — filed 2026-05-27
- Portfolio holdings (N-PORT) — filed 2026-02-26
- Annual census (N-CEN) — filed 2025-12-12
- Annual census (N-CEN) — filed 2024-12-13
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.