MCZZX Performance — MassMutual Core Bond Fund, Class I
Data updated: 2026-08-27
MCZZX returned +1.40% year to date and +5.23% over one year to Jun 2026. Annualised returns are +6.05% over 3 years and +0.67% over 5 years. The fund beat its Intermediate Core Bond category average: $100 invested three years ago grew to $119, against $115 for the category, and to $105 over one year, against $104. Volatility over the past three years was 5.61% a year. In the 12 months to Jun 2026 the fund took in a net $58.8M, and assets reached $846.76M.
MCZZX Growth of $100
What $100 invested in MassMutual Core Bond Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the Intermediate Core Bond category average over the same months.
| Period | MCZZX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $105 | $104 |
| 3 years (Jul 2023 – Jun 2026) | $119 | $115 |
| 5 years (Jul 2021 – Jun 2026) | $103 | $102 |
| Since data start (Jul 2019 – Jun 2026) | $116 | $112 |
MCZZX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +1.40% |
| 1 year | +5.23% |
| 3 years (annualised) | +6.05% |
| 5 years (annualised) | +0.67% |
MCZZX Annual Returns
Calendar-year total returns of MassMutual Core Bond Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +1.40% |
| 2025 | +8.16% |
| 2024 | +3.86% |
| 2023 | +6.72% |
| 2022 | −15.19% |
| 2021 | +0.67% |
| 2020 | +8.64% |
| 2019 (Jul–Dec) | +2.61% |
MCZZX Monthly Returns
Monthly total returns as reported on SEC Form N-PORT.
| Year | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 2026 | +0.4% | +1.3% | −1.8% | +0.7% | +0.5% | +0.4% | — | — | — | — | — | — |
| 2025 | −0.4% | +2.4% | +0.6% | −0.1% | −0.2% | +1.9% | 0.0% | +1.4% | +1.4% | +0.6% | +0.4% | 0.0% |
| 2024 | +1.1% | −1.2% | +0.3% | +1.1% | +1.9% | −2.4% | +1.4% | +1.7% | +2.3% | −1.5% | +1.4% | −2.2% |
| 2023 | +1.2% | −2.1% | +3.6% | −0.2% | −1.0% | +0.4% | −2.2% | −0.5% | +0.3% | +4.1% | +4.8% | −1.7% |
| 2022 | −2.8% | −1.6% | −2.0% | −2.2% | −0.3% | −3.8% | −4.9% | −2.4% | +2.4% | −0.3% | +3.7% | −1.9% |
| 2021 | −0.8% | −1.2% | −0.2% | +1.0% | +0.5% | +1.1% | −0.8% | 0.0% | +1.1% | −0.3% | +0.2% | +0.1% |
| 2020 | −6.3% | +1.3% | +2.0% | +1.9% | +1.6% | +3.0% | +0.2% | 0.0% | +2.4% | +0.7% | +2.0% | −0.1% |
| 2019 | — | — | — | — | — | — | −0.4% | +2.3% | +0.4% | 0.0% | 0.0% | +0.4% |
MCZZX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 5.61%
- 3-year Sharpe ratio: 0.28 (vs 4.5% risk-free rate)
- Best month: +4.83% (Nov 2023)
- Worst month: −2.35% (Jun 2024)
MCZZX Fund Flows
Monthly money in and out of MassMutual Core Bond Fund, from SEC Form N-PORT.
- 12-month net flow: $58.8M
- 12-month gross sales (incl. reinvestments): $496.9M
- Sales ÷ redemptions: 1.13×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $24.4M | $27.8M | −$3.4M |
| May 2026 | $21.1M | $14.1M | $7.0M |
| Apr 2026 | $16.5M | $20.5M | −$4.0M |
| Mar 2026 | $46.8M | $21.0M | $25.8M |
| Feb 2026 | $30.0M | $46.5M | −$16.5M |
| Jan 2026 | $21.3M | $17.9M | $3.4M |
| Dec 2025 | $18.7M | $51.7M | −$33.0M |
| Nov 2025 | $26.0M | $18.9M | $7.2M |
| Oct 2025 | $23.1M | $19.5M | $3.6M |
| Sep 2025 | $231.2M | $123.6M | $107.6M |
| Aug 2025 | $20.9M | $59.5M | −$38.5M |
| Jul 2025 | $16.8M | $17.1M | −$378K |
MCZZX Assets Under Management
Net assets of MassMutual Core Bond Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $846.76M |
| 2026-03-31 | $843.89M |
| 2025-12-31 | $841.79M |
| 2025-09-30 | $864.93M |
| 2025-06-30 | $785.81M |
| 2025-03-31 | $798.84M |
| 2024-12-31 | $981.72M |
| 2024-09-30 | $1.04B |
| 2024-06-30 | $634.91M |
| 2024-03-31 | $651.19M |
| 2023-12-31 | $702.73M |
| 2023-09-30 | $668.76M |
For information only. Not investment advice: figures are as reported in SEC filings and may contain errors or be out of date. Past performance does not guarantee future results.