MPHAX — MassMutual High Yield Fund
Data updated: 2026-08-27
MPHAX — MassMutual High Yield Fund. Short Corporate Bond · $554.99M AUM · 1.05% expense ratio · 6.1% 1-yr return. Holdings, fees, performance and SEC filings.
MPHAX Fund Overview
MPHAX — MassMutual High Yield Fund is a US mutual fund managed by Massmutual Premier Funds, categorised as Short Corporate 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: Short Corporate Bond
- Assets under management: $554.99M
- 1-year return: 6.1%
- Ticker: MPHAX
- SEC CIK: 0000927972
- SEC series ID: S000003779
- Share class ID: C000010484
MPHAX Holdings
Top 10 holdings of MassMutual High Yield Fund by percentage of net assets, from the fund's latest SEC N-PORT filing.
| Holding | % of net assets |
|---|---|
| State Street Global Advisors | 4.46% |
| Superior Plus/gen Prtnr | 1.71% |
| Sunoco LP | 1.67% |
| Itt Holdings LLC | 1.66% |
| Seaspan Corp. Pte Ltd. | 1.62% |
| First Quantum Minerals L | 1.56% |
| Pra Group, Inc. | 1.56% |
| California Buyer/atlanti | 1.42% |
| Jefferson Capital Holdin | 1.30% |
| Team Health Holdings, Inc. | 1.21% |
MPHAX Portfolio Allocation
Asset-class allocation of MassMutual High Yield Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Asset class | Allocation |
|---|---|
| Fixed Income | 92.0% |
| Cash & Equivalents | 8.2% |
| Loans | 4.0% |
| Equity | 0.1% |
MPHAX Performance
Total returns for MPHAX (as of 2026-09-01), from SEC filings.
| Period | Total return |
|---|---|
| YTD | 2.4% |
| 1 year | 6.1% |
| 3 years (annualised) | 9.0% |
| 5 years (annualised) | 4.2% |
MPHAX Risk Information
Risk metrics for MPHAX, derived from monthly returns in SEC filings.
- 1-year volatility (annualised): 2.1%
MPHAX Costs and Fees
MPHAX costs about $105 per $10,000 invested per year in fund expenses.
- Net expense ratio: 1.05%
- Gross expense ratio: 1.10%
- Portfolio turnover: 97%
- Brokerage commissions: 0.09 bps of average net assets (SEC N-CEN)
MPHAX Cashflows
Over the 12 months to 2026-06, MassMutual High Yield Fund had net inflows of $104.33M, from monthly SEC N-PORT filings.
| Month | Net flow |
|---|---|
| 2026-06 | $10.36M |
| 2026-05 | $11.50M |
| 2026-04 | $20.22M |
| 2026-03 | −$33.70M |
| 2026-02 | $9.97M |
| 2026-01 | $5.14M |
MPHAX Debt Constituents
Largest debt holdings of MassMutual High Yield Fund by percentage of net assets, from the latest SEC N-PORT filing.
| Debt holding | % of net assets |
|---|---|
| Superior Plus/gen Prtnr | 1.71% |
| Sunoco LP | 1.67% |
| Itt Holdings LLC | 1.66% |
| Seaspan Corp. Pte Ltd. | 1.62% |
| First Quantum Minerals L | 1.56% |
| Pra Group, Inc. | 1.56% |
| California Buyer/atlanti | 1.42% |
| Jefferson Capital Holdin | 1.30% |
| Team Health Holdings, Inc. | 1.21% |
| Arcosa, Inc. | 1.02% |
MPHAX Prospectus and SEC Filings
Official MassMutual High Yield Fund filings on SEC EDGAR — prospectus, portfolio holdings and annual reports.
- Prospectus (485BPOS) — filed 2026-01-30
- Prospectus (485BPOS) — filed 2025-01-31
- Prospectus (485BPOS) — filed 2024-02-01
- 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 Short Corporate 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.