Compare/Updated Oct 26, 2026, refreshed every trading day
VIIIX vs VTSAX
Vanguard Institutional Index Fund against Vanguard Total Stock Market Index Fund: 4 years of returns, risk and today’s technical read, from Kavout’s own data.
VIIIX did slightly better over the period: $1,000 grew to $2,058 versus $2,016 for VTSAX, a 105.8% versus 101.6% total return. VIIIX also led over three years (+83.1% versus +81.8%) and delivered marginally stronger one-, three-, and six-month results, although VTSAX edged it on YTD performance (+12.2% versus +12.1%). The difference was modest: the funds had a 0.997 correlation, VIIIX outperformed in 28 of 48 months, and the typical monthly gap was only 0.23 percentage points. VIIIX also carried slightly lower risk, with 12.8% versus 13.0% 12-month volatility and a less severe maximum drawdown of -18.7% versus -19.4%. Overall, VIIIX was the better performer and marginally steadier, but both produced very similar results.
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Head to head
Which has returned more, VIIIX or VTSAX?
VIIIX beat VTSAX in 28 of the last 48 months; VTSAX won the other 20. The typical monthly gap was 0.23 points.
Total return by period
Which is riskier?
Both: Feb 19, 2025 to Apr 8, 2025
- 0.997
- correlation of daily moves, 4 years
- 0.97
- VIIIX move per 1% in VTSAX
- 0.997
- correlation, last 12 months
Month by month
Of the last 48 months. The typical gap was 0.23 points.
When did they diverge?
| Month | VIIIX | VTSAX | Gap |
|---|---|---|---|
| December 2023 | +4.5% | +5.8% | -1.21 pts |
| March 2023 | +3.7% | +2.6% | +1.03 pts |
| January 2024 | +1.7% | +0.7% | +0.98 pts |
| November 2024 | +5.9% | +6.6% | -0.76 pts |
Where the numbers come from. 1000 daily adjusted closes per fund from the Kavout market-data API, dividends included. Signals and indicators are Kavout’s own, refreshed nightly. Every figure is calculated from those adjusted closes.
Holdings and fees
What do you actually own with VIIIX and VTSAX?
- Price
- $610.50
- Price
- $181.59
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