No Brainer Portfolio by Bill Bernstein
The No-Brainer Portfolio is one of William Bernstein's simplest and most widely cited model allocations. Bernstein, a neurologist turned financial theorist and author of books including The Four Pillars of Investing and The Intelligent Asset Allocator, first described the No-Brainer Portfolio to illustrate that a straightforward, low-cost, four-fund allocation can outperform most actively managed portfolios over the long run. The portfolio holds equal 25% positions in US large-cap stocks, US small-cap stocks, international stocks, and short-term bonds.
Investment Philosophy
Bernstein's philosophy holds that the single most important determinant of investment success is the stock-bond split, and that within equities, simple diversification across market segments — including small-cap stocks, which carry a well-documented return premium — is more important than manager selection. The No-Brainer's equal weighting across four funds reflects the view that equal weighting is simple, easy to maintain, and avoids the need to make precise judgements about optimal weights. The short-term bond allocation keeps interest rate risk low while providing a buffer against equity volatility.
Who It's For
This portfolio is suited to investors who want a simple, evidence-grounded approach without complexity or ongoing management. The 75% equity allocation makes it appropriate for investors with a medium-to-long time horizon and moderate-to-high risk tolerance. It is particularly appropriate for investors who want some small-cap exposure beyond a plain total market fund without committing to a full factor-tilted strategy.
Pros
- Extremely simple: just four equally weighted funds
- Includes small-cap equity exposure, which has historically delivered a return premium over large-cap stocks
- Short-term bonds keep interest rate risk minimal while still providing portfolio ballast
Cons
- Equal weighting across the four funds is arbitrary and may not suit all risk profiles
- 75% equity allocation is aggressive and will produce large drawdowns in severe bear markets
- No international bond exposure or alternative asset classes beyond the four core funds
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Target Allocation
Performance Snapshot
Rolling Returns
| Period | Low | Average | High |
|---|---|---|---|
| 1 Year | -33.8% | +8.7% | +44.1% |
| 3 Year | -10.0% | +7.7% | +21.5% |
| 5 Year | -2.6% | +7.3% | +17.8% |
| 10 Year | +1.7% | +6.9% | +11.0% |
Growth of $10,000
Historical Drawdown
Percentage decline from the portfolio's peak value at each point in time.
Rolling Returns
Annualised return for each rolling period ending on that date.
Annualised return for each 1Y period ending on that date.