VSTIX Performance — Stock Index Fund
Data updated: 2026-09-28
VSTIX returned +11.14% year to date and +29.48% over one year to May 2026. Annualised returns are +23.23% over 3 years and +13.81% over 5 years. The fund beat its US Large Blend category average: $100 invested three years ago grew to $187, against $165 for the category, and to $129 over one year, against $122. Volatility over the past three years was 13.28% a year. In the 12 months to May 2026 the fund lost a net $277.8M, and assets reached $7.16B.
VSTIX Growth of $100
What $100 invested in Stock 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 | VSTIX | Category average |
|---|---|---|
| 1 year (Jun 2025 – May 2026) | $129 | $122 |
| 3 years (Jun 2023 – May 2026) | $187 | $165 |
| 5 years (Jun 2021 – May 2026) | $191 | $164 |
| Since data start (Sep 2019 – May 2026) | $281 | $229 |
VSTIX Trailing Returns
Total returns to May 2026, from SEC N-PORT.
| Period | Total return |
|---|---|
| YTD | +11.14% |
| 1 year | +29.48% |
| 3 years (annualised) | +23.23% |
| 5 years (annualised) | +13.81% |
VSTIX Annual Returns
Calendar-year total returns of Stock Index Fund, compounded from monthly SEC N-PORT returns. Partial years show the months covered.
| Year | Total return |
|---|---|
| 2026 (Jan–May) | +11.14% |
| 2025 | +17.56% |
| 2024 | +24.67% |
| 2023 | +25.81% |
| 2022 | −18.33% |
| 2021 | +28.36% |
| 2020 | +18.00% |
| 2019 (Sep–Dec) | +11.01% |
VSTIX 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% | −5.0% | +10.5% | +5.2% | — | — | — | — | — | — | — |
| 2025 | +2.8% | −1.3% | −5.7% | −0.7% | +6.3% | +5.1% | +2.2% | +2.0% | +3.6% | +2.3% | +0.2% | 0.0% |
| 2024 | +1.6% | +5.3% | +3.2% | −4.1% | +4.9% | +3.6% | +1.2% | +2.4% | +2.1% | −0.9% | +5.9% | −2.4% |
| 2023 | +6.2% | −2.5% | +3.6% | +1.5% | +0.4% | +6.6% | +3.2% | −1.6% | −4.8% | −2.2% | +9.1% | +4.5% |
| 2022 | −5.2% | −3.0% | +3.7% | −8.7% | +0.2% | −8.3% | +9.2% | −4.1% | −9.2% | +8.1% | +5.5% | −5.9% |
| 2021 | −1.0% | +2.7% | +4.4% | +5.3% | +0.7% | +2.3% | +2.4% | +3.0% | −4.7% | +7.0% | −0.7% | +4.5% |
| 2020 | −0.1% | −8.3% | −12.4% | +12.8% | +4.7% | +2.0% | +5.6% | +7.2% | −3.8% | −2.7% | +10.9% | +3.8% |
| 2019 | — | — | — | — | — | — | — | — | +1.8% | +2.2% | +3.6% | +3.0% |
VSTIX Risk
Risk measures from monthly returns over Jun 2023 – May 2026.
- 3-year volatility (annualised): 13.28%
- 3-year Sharpe ratio: 1.41 (vs 4.5% risk-free rate)
- Best month: +10.48% (Apr 2026)
- Worst month: −5.67% (Mar 2025)
VSTIX Fund Flows
Monthly money in and out of Stock Index Fund, from SEC Form N-PORT.
- 12-month net flow: −$277.8M
- 12-month gross sales (incl. reinvestments): $1.1B
- Sales ÷ redemptions: 0.79×
| Month | Sales | Redemptions | Net flow |
|---|---|---|---|
| May 2026 | $15.0M | $157.5M | −$142.4M |
| Apr 2026 | $34.5M | $60.3M | −$25.8M |
| Mar 2026 | $780.3M | $36.4M | $743.8M |
| Feb 2026 | $45.5M | $41.7M | $3.8M |
| Jan 2026 | $40.0M | $27.0M | $13.0M |
| Dec 2025 | $26.4M | $122.1M | −$95.7M |
| Nov 2025 | $4.1M | $297.2M | −$293.0M |
| Oct 2025 | $78.2M | $87.6M | −$9.4M |
| Sep 2025 | $25.7M | $74.5M | −$48.8M |
| Aug 2025 | $3.4M | $139.5M | −$136.2M |
| Jul 2025 | $2.1M | $110.7M | −$108.6M |
| Jun 2025 | $2.2M | $180.7M | −$178.4M |
VSTIX Assets Under Management
Net assets of Stock Index Fund by report date, from SEC N-PORT filings.
| Report date | Net assets |
|---|---|
| 2026-05-31 | $7.16B |
| 2026-02-28 | $6.65B |
| 2025-11-30 | $6.68B |
| 2025-08-31 | $6.63B |
| 2025-05-31 | $6.45B |
| 2025-02-28 | $6.68B |
| 2024-11-30 | $7.03B |
| 2024-08-31 | $6.71B |
| 2024-05-31 | $6.42B |
| 2024-02-29 | $6.37B |
| 2023-11-30 | $5.76B |
| 2023-08-31 | $5.81B |
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.