MMFFX Performance — MM S&P 500 Index Fund, Class A
Data updated: 2026-08-27
MMFFX returned +9.86% year to date and +21.49% over one year to Jun 2026. Annualised returns are +19.72% over 3 years and +12.58% over 5 years. The fund beat its US Large Blend category average: $100 invested three years ago grew to $172, against $157 for the category, and to $121 over one year, against $118. Volatility over the past three years was 13.06% a year. In the 12 months to Jun 2026 the fund lost a net $101.1M, and assets reached $2.23B.
MMFFX Growth of $100
What $100 invested in MM S&P 500 Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Large Blend category average over the same months.
| Period | MMFFX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $121 | $118 |
| 3 years (Jul 2023 – Jun 2026) | $172 | $157 |
| 5 years (Jul 2021 – Jun 2026) | $181 | $161 |
| Since data start (Jul 2019 – Jun 2026) | $270 | $229 |
MMFFX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +9.86% |
| 1 year | +21.49% |
| 3 years (annualised) | +19.72% |
| 5 years (annualised) | +12.58% |
MMFFX Annual Returns
Calendar-year total returns of MM S&P 500 Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +9.86% |
| 2025 | +16.91% |
| 2024 | +24.07% |
| 2023 | +25.36% |
| 2022 | −18.69% |
| 2021 | +27.90% |
| 2020 | +17.65% |
| 2019 (Jul–Dec) | +10.52% |
MMFFX 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 | +1.4% | −0.8% | −5.1% | +10.5% | +5.1% | −1.0% | — | — | — | — | — | — |
| 2025 | −5.7% | −1.4% | +2.7% | −0.7% | +6.2% | +5.0% | +2.2% | +1.9% | +3.6% | +2.2% | +0.2% | 0.0% |
| 2024 | +3.2% | +5.2% | +1.6% | +3.5% | +4.9% | −4.2% | +2.1% | +2.4% | +1.2% | −2.4% | +5.8% | −1.0% |
| 2023 | +3.6% | −2.5% | +6.2% | +6.6% | +0.3% | +1.5% | −4.8% | −1.6% | +3.2% | +4.5% | +9.1% | −2.2% |
| 2022 | +3.7% | −3.1% | −5.2% | −8.3% | +0.1% | −8.8% | −9.2% | −4.1% | +9.1% | −5.8% | +5.5% | +8.1% |
| 2021 | +4.3% | +2.7% | −1.0% | +2.2% | +0.7% | +5.3% | −4.7% | +3.0% | +2.3% | +4.5% | −0.8% | +7.0% |
| 2020 | −12.2% | −8.3% | −0.1% | +1.9% | +4.8% | +12.6% | −3.9% | +7.1% | +5.6% | +3.7% | +10.9% | −2.7% |
| 2019 | — | — | — | — | — | — | +1.8% | −1.6% | +1.4% | +2.9% | +3.6% | +2.1% |
MMFFX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 13.06%
- 3-year Sharpe ratio: 1.17 (vs 4.5% risk-free rate)
- Best month: +10.48% (Apr 2026)
- Worst month: −5.72% (Jan 2025)
MMFFX Fund Flows
Monthly money in and out of MM S&P 500 Index Fund, from SEC Form N-PORT.
- 12-month net flow: −$101.1M
- 12-month gross sales (incl. reinvestments): $865.1M
- Sales ÷ redemptions: 0.90×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $46.8M | $82.6M | −$35.8M |
| May 2026 | $33.8M | $85.9M | −$52.1M |
| Apr 2026 | $36.5M | $51.1M | −$14.6M |
| Mar 2026 | $37.1M | $86.1M | −$49.0M |
| Feb 2026 | $114.7M | $166.9M | −$52.3M |
| Jan 2026 | $38.9M | $59.2M | −$20.3M |
| Dec 2025 | $372.7M | $56.7M | $316.0M |
| Nov 2025 | $29.9M | $62.0M | −$32.1M |
| Oct 2025 | $44.5M | $50.8M | −$6.3M |
| Sep 2025 | $28.6M | $108.4M | −$79.8M |
| Aug 2025 | $41.6M | $86.4M | −$44.8M |
| Jul 2025 | $39.9M | $69.9M | −$30.1M |
MMFFX Assets Under Management
Net assets of MM S&P 500 Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $2.23B |
| 2026-03-31 | $2.03B |
| 2025-12-31 | $2.24B |
| 2025-09-30 | $2.25B |
| 2025-06-30 | $2.23B |
| 2025-03-31 | $2.13B |
| 2024-12-31 | $2.28B |
| 2024-09-30 | $2.38B |
| 2024-06-30 | $2.30B |
| 2024-03-31 | $2.84B |
| 2023-12-31 | $2.65B |
| 2023-09-30 | $2.41B |
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.