SPIIX Performance — SIMT S&P 500 Index Fund, Class I
Data updated: 2026-08-28
SPIIX returned +9.77% year to date and +21.44% over one year to Jun 2026. Annualised returns are +19.78% over 3 years and +12.64% 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 13.05% a year. In the 12 months to Jun 2026 the fund lost a net $45.6M, and assets reached $1.10B.
SPIIX Growth of $100
What $100 invested in SIMT 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 | SPIIX | 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) | $271 | $229 |
SPIIX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +9.77% |
| 1 year | +21.44% |
| 3 years (annualised) | +19.78% |
| 5 years (annualised) | +12.64% |
SPIIX Annual Returns
Calendar-year total returns of SIMT S&P 500 Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +9.77% |
| 2025 | +17.09% |
| 2024 | +24.17% |
| 2023 | +25.47% |
| 2022 | −18.65% |
| 2021 | +27.90% |
| 2020 | +17.62% |
| 2019 (Jul–Dec) | +10.57% |
SPIIX 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 | −5.0% | −0.8% | +1.4% | −1.0% | +5.2% | +10.4% | — | — | — | — | — | — |
| 2025 | −5.7% | −1.4% | +2.7% | +5.0% | +6.2% | −0.7% | +3.6% | +2.0% | +2.2% | 0.0% | +0.2% | +2.3% |
| 2024 | +3.2% | +5.3% | +1.6% | +3.5% | +4.9% | −4.1% | +2.1% | +2.4% | +1.2% | −2.5% | +5.8% | −1.0% |
| 2023 | +3.6% | −2.5% | +6.2% | +6.6% | +0.4% | +1.5% | −4.8% | −1.6% | +3.2% | +4.5% | +9.1% | −2.2% |
| 2022 | +3.7% | −3.0% | −5.2% | −8.3% | +0.1% | −8.8% | −9.3% | −4.1% | +9.2% | −5.8% | +5.5% | +8.0% |
| 2021 | +4.3% | +2.7% | −1.1% | +2.3% | +0.6% | +5.3% | −4.7% | +3.0% | +2.3% | +4.4% | −0.8% | +7.0% |
| 2020 | −12.4% | −8.3% | −0.1% | +1.9% | +4.7% | +12.7% | −3.9% | +7.1% | +5.6% | +3.8% | +10.9% | −2.7% |
| 2019 | — | — | — | — | — | — | +1.8% | −1.6% | +1.4% | +3.0% | +3.6% | +2.1% |
SPIIX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 13.05%
- 3-year Sharpe ratio: 1.17 (vs 4.5% risk-free rate)
- Best month: +10.42% (Jun 2026)
- Worst month: −5.69% (Jan 2025)
SPIIX Fund Flows
Monthly money in and out of SIMT S&P 500 Index Fund, from SEC Form N-PORT.
- 12-month net flow: −$45.6M
- 12-month gross sales (incl. reinvestments): $235.0M
- Sales ÷ redemptions: 0.84×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $34.3M | $13.4M | $20.8M |
| May 2026 | $5.3M | $63.5M | −$58.2M |
| Apr 2026 | $5.1M | $50.5M | −$45.5M |
| Mar 2026 | $11.3M | $14.6M | −$3.4M |
| Feb 2026 | $5.9M | $54.5M | −$48.7M |
| Jan 2026 | $57.8M | $11.6M | $46.2M |
| Dec 2025 | $15.2M | $12.9M | $2.3M |
| Nov 2025 | $7.7M | $8.3M | −$582K |
| Oct 2025 | $70.8M | $17.8M | $53.0M |
| Sep 2025 | $9.3M | $13.4M | −$4.2M |
| Aug 2025 | $7.3M | $9.6M | −$2.3M |
| Jul 2025 | $5.2M | $10.3M | −$5.1M |
SPIIX Assets Under Management
Net assets of SIMT S&P 500 Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $1.10B |
| 2026-03-31 | $1.03B |
| 2025-12-31 | $1.08B |
| 2025-09-30 | $1.09B |
| 2025-06-30 | $1.02B |
| 2025-03-31 | $931.00M |
| 2024-12-31 | $992.03M |
| 2024-09-30 | $1.03B |
| 2024-06-30 | $1.05B |
| 2024-03-31 | $1.03B |
| 2023-12-31 | $947.92M |
| 2023-09-30 | $866.41M |
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.