SSMKX Performance — State Street Small/mid Cap Equity Index Fund, Class K
Data updated: 2026-08-28
SSMKX returned +17.88% year to date and +29.08% over one year to Jun 2026. Annualised returns are +20.04% over 3 years and +7.38% over 5 years. Against its US Small Blend category average the fund came out ahead over three years but behind over one: $100 invested three years ago grew to $173, against $156 for the category, and to $129 over one year, against $133. Volatility over the past three years was 18.19% a year. In the 12 months to Jun 2026 the fund took in a net $76.0M, and assets reached $926.44M.
SSMKX Growth of $100
What $100 invested in State Street Small/mid Cap Equity Index Fund grew to, compounded from monthly returns reported on SEC Form N-PORT, against the US Small Blend category average over the same months.
| Period | SSMKX | Category average |
|---|---|---|
| 1 year (Jul 2025 – Jun 2026) | $129 | $133 |
| 3 years (Jul 2023 – Jun 2026) | $173 | $156 |
| 5 years (Jul 2021 – Jun 2026) | $143 | $141 |
| Since data start (Jul 2019 – Jun 2026) | $232 | $209 |
SSMKX Trailing Returns
Total returns to Jun 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +17.88% |
| 1 year | +29.08% |
| 3 years (annualised) | +20.04% |
| 5 years (annualised) | +7.38% |
SSMKX Annual Returns
Calendar-year total returns of State Street Small/mid Cap Equity Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–Jun) | +17.88% |
| 2025 | +12.78% |
| 2024 | +17.17% |
| 2023 | +25.17% |
| 2022 | −25.41% |
| 2021 | +12.44% |
| 2020 | +32.44% |
| 2019 (Jul–Dec) | +6.94% |
SSMKX 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 | +2.4% | +1.4% | −4.9% | +9.4% | +4.4% | +4.5% | — | — | — | — | — | — |
| 2025 | +5.2% | −5.7% | −7.6% | −0.5% | +7.1% | +5.5% | +2.2% | +4.3% | +2.2% | +1.0% | 0.0% | −0.5% |
| 2024 | −2.3% | +6.2% | +3.4% | −6.4% | +3.5% | 0.0% | +6.2% | +0.4% | +1.6% | +0.5% | +11.7% | −7.2% |
| 2023 | +10.7% | −1.6% | −2.8% | −2.2% | +0.5% | +8.3% | +5.8% | −4.0% | −4.9% | −6.2% | +11.0% | +10.3% |
| 2022 | −9.7% | −0.1% | +0.8% | −10.4% | −1.7% | −9.0% | +10.5% | −2.0% | −9.8% | +8.5% | +3.4% | −6.5% |
| 2021 | +2.3% | +5.0% | −0.1% | +4.2% | −0.6% | +3.1% | −1.3% | +2.0% | −3.8% | +5.7% | −5.3% | +1.1% |
| 2020 | −0.6% | −7.9% | −21.2% | +15.5% | +8.8% | +3.8% | +5.8% | +7.5% | −2.8% | +0.3% | +18.1% | +7.4% |
| 2019 | — | — | — | — | — | — | +1.5% | −4.3% | +1.1% | +1.8% | +4.7% | +2.1% |
SSMKX Risk
Risk measures from monthly returns over Jul 2023 – Jun 2026.
- 3-year volatility (annualised): 18.19%
- 3-year Sharpe ratio: 0.85 (vs 4.5% risk-free rate)
- Best month: +11.72% (Nov 2024)
- Worst month: −7.65% (Mar 2025)
SSMKX Fund Flows
Monthly money in and out of State Street Small/mid Cap Equity Index Fund, from SEC Form N-PORT.
- 12-month net flow: $76.0M
- 12-month gross sales (incl. reinvestments): $234.5M
- Sales ÷ redemptions: 1.48×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| Jun 2026 | $9.7M | $13.1M | −$3.3M |
| May 2026 | $21.3M | $13.7M | $7.6M |
| Apr 2026 | $16.7M | $11.0M | $5.7M |
| Mar 2026 | $15.4M | $9.7M | $5.7M |
| Feb 2026 | $8.1M | $9.7M | −$1.6M |
| Jan 2026 | $19.1M | $29.2M | −$10.1M |
| Dec 2025 | $57.8M | $9.8M | $48.0M |
| Nov 2025 | $9.2M | $8.0M | $1.2M |
| Oct 2025 | $41.9M | $15.7M | $26.1M |
| Sep 2025 | $9.7M | $9.8M | −$28K |
| Aug 2025 | $13.4M | $8.5M | $4.9M |
| Jul 2025 | $12.1M | $20.4M | −$8.3M |
SSMKX Assets Under Management
Net assets of State Street Small/mid Cap Equity Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-06-30 | $926.44M |
| 2026-03-31 | $767.36M |
| 2025-12-31 | $782.03M |
| 2025-09-30 | $741.39M |
| 2025-06-30 | $683.88M |
| 2025-03-31 | $593.61M |
| 2024-12-31 | $644.50M |
| 2024-09-30 | $644.70M |
| 2024-06-30 | $574.95M |
| 2024-03-31 | $577.24M |
| 2023-12-31 | $533.43M |
| 2023-09-30 | $451.55M |
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.