MITBX Performance — Massachusetts Investors Trust, Class B
Data updated: 2026-08-24
MITBX returned +6.30% year to date and +13.91% over one year to Jun 2026. Annualised returns are +14.88% over 3 years and +8.78% over 5 years. The fund trailed its US Large Blend category average: $100 invested three years ago grew to $152, against $157 for the category, and to $114 over one year, against $118. Volatility over the past three years was 12.22% a year. In the 12 months to Jun 2026 the fund took in a net $29.0M, and assets reached $6.82B.
MITBX Growth of $100
What $100 invested in Massachusetts Investors Trust grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Large Blend category average over the same months.
| Period | MITBX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $114 | $118 |
| 3 years (Jul 2023 – Jun 2026) | $152 | $157 |
| 5 years (Jul 2021 – Jun 2026) | $152 | $161 |
| Since data start (Jul 2019 – Jun 2026) | $217 | $229 |
MITBX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +6.30% |
| 1 year | +13.91% |
| 3 years (annualised) | +14.88% |
| 5 years (annualised) | +8.78% |
MITBX Annual Returns
Calendar-year total returns of Massachusetts Investors Trust, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +6.30% |
| 2025 | +12.72% |
| 2024 | +18.79% |
| 2023 | +18.26% |
| 2022 | −16.97% |
| 2021 | +25.89% |
| 2020 | +13.26% |
| 2019 (Jul–Dec) | +8.76% |
MITBX 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 | +2.6% | −0.9% | −5.7% | +9.2% | +2.8% | −1.1% | — | — | — | — | — | — |
| 2025 | +3.2% | −0.9% | −4.9% | −1.5% | +5.4% | +4.2% | +2.0% | +1.1% | +2.3% | +1.2% | +0.2% | +0.1% |
| 2024 | +1.6% | +5.1% | +3.5% | −4.2% | +5.3% | +2.4% | +1.1% | +1.6% | +0.7% | −0.9% | +5.0% | −3.2% |
| 2023 | +5.4% | −4.5% | +2.7% | +2.4% | −0.9% | +5.8% | +2.8% | −2.0% | −5.1% | −1.5% | +8.3% | +4.3% |
| 2022 | −5.0% | −3.8% | +2.2% | −6.8% | +0.4% | −6.8% | +8.0% | −4.9% | −8.6% | +7.8% | +6.3% | −5.2% |
| 2021 | −1.1% | +3.1% | +4.0% | +5.7% | +1.5% | +1.6% | +3.7% | +2.1% | −4.5% | +6.0% | −2.4% | +4.1% |
| 2020 | −0.5% | −8.4% | −12.9% | +12.4% | +5.0% | +1.0% | +4.6% | +5.9% | −3.3% | −2.6% | +10.9% | +3.4% |
| 2019 | — | — | — | — | — | — | +2.2% | −1.5% | +0.7% | +0.4% | +3.4% | +3.3% |
MITBX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 12.22%
- 3-year Sharpe ratio: 0.85 (vs 4.5% risk-free rate)
- Best month: +9.18% (Apr 2026)
- Worst month: −5.68% (Mar 2026)
MITBX Fund Flows
Monthly money in and out of Massachusetts Investors Trust, from SEC Form N-PORT.
- 12-month net flow: $29.0M
- 12-month gross sales (incl. reinvestments): $1.4B
- Sales ÷ redemptions: 1.02×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $37.6M | $100.7M | −$63.1M |
| May 2026 | $34.4M | $95.3M | −$60.9M |
| Apr 2026 | $41.7M | $103.5M | −$61.8M |
| Mar 2026 | $50.2M | $107.4M | −$57.3M |
| Feb 2026 | $48.2M | $100.7M | −$52.5M |
| Jan 2026 | $47.8M | $110.7M | −$62.9M |
| Dec 2025 | $766.3M | $182.0M | $584.3M |
| Nov 2025 | $36.2M | $126.8M | −$90.7M |
| Oct 2025 | $42.8M | $106.4M | −$63.6M |
| Sep 2025 | $34.9M | $85.7M | −$50.7M |
| Aug 2025 | $184.3M | $106.8M | $77.6M |
| Jul 2025 | $27.0M | $96.3M | −$69.3M |
MITBX Assets Under Management
Net assets of Massachusetts Investors Trust by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $6.82B |
| 2026-03-31 | $6.31B |
| 2025-12-31 | $6.74B |
| 2025-09-30 | $6.94B |
| 2025-06-30 | $6.76B |
| 2025-03-31 | $6.43B |
| 2024-12-31 | $6.79B |
| 2024-09-30 | $7.01B |
| 2024-06-30 | $6.92B |
| 2024-03-31 | $6.84B |
| 2023-12-31 | $6.39B |
| 2023-09-30 | $5.94B |
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.