Allocation Lab

Three-Fund Portfolio (Bogleheads)

Created by Bogleheads community (inspired by John C. Bogle)

The simplest globally diversified index portfolio you can build with three funds.

Current Allocation

US Total Market40%
Total International20%
US Total Bond Market40%

How This Strategy Maps to ETFs

Asset ClassWeightETF
US Total Market40%VTI
Total International20%VXUS
US Total Bond Market40%BND

Performance: 29.8-Year Backtest

Data for Total International starts 1996. Simulation covers 29.8 years.

Three-Fund Portfolio (Bogleheads)
── Actual ETF data   ╌╌ Proxy index data

$10,000 initial investment → $60,185

Annual Returns

1996–2011

'96'97'98'99'00'01'02'03'04'05'06'07'08'09'10'11
-1+15+12+11+2-1-6+4+6+4+6+0-23+26+15+3

2012–2026

'12'13'14'15'16'17'18'19'20'21'22'23'24'25'26
+10+11+8-3+12+17-2+14+13+8-8+10+13+16+7

Key Metrics

CAGR+8.18%
Max Drawdown-32.2%
Volatility9.8%
Sharpe Ratio0.65
Sortino Ratio0.99
Best / Worst Year2009 / 2008

What is it?

The Three-Fund Portfolio is the flagship strategy of the Bogleheads community, a group of investors inspired by Vanguard founder John C. Bogle's philosophy of low-cost index investing. It holds exactly three funds: a total US stock market index, a total international stock market index, and a total US bond market index, in this example weighted 40/20/40.

The philosophy

Bogle's central argument was that most investors, including professionals, cannot reliably beat the market after costs, so the rational strategy is to capture the entire market's return as cheaply as possible rather than try to pick winning stocks, sectors, or managers. The Three-Fund Portfolio operationalizes this idea in its purest form: own essentially every publicly traded company in the US and abroad, plus a broad slice of investment-grade bonds, and let the market's long-run growth do the work while expenses and trading are kept to a minimum.

How it works

The US total market sleeve owns thousands of domestic companies across all sizes and sectors in market-cap-weighted proportion, so it automatically tilts toward whichever companies are currently largest without requiring any active decisions. The international sleeve extends the same total-market logic outside the US, adding developed and emerging market exposure and reducing single-country risk. The bond sleeve dampens volatility and provides a stable income stream, with its weight typically increased for more conservative investors and decreased for more aggressive ones — the 40/20/40 split shown here represents a moderate version of the approach.

Who is it for?

This portfolio is built for investors who want maximum diversification and minimum complexity, are comfortable accepting the market's return rather than trying to beat it, and prefer to set their stock/bond ratio once based on their own risk tolerance and time horizon rather than following someone else's fixed formula. It is especially popular with younger, long-horizon investors who adjust the stock/bond mix over time as they approach a goal such as retirement.

Key strengths & trade-offs

Its greatest strength is transparent, low-cost, maximally diversified market exposure that is trivially easy to maintain and explain. Because the ratios are flexible by design, it is also easy to adapt to different risk tolerances simply by changing the stock/bond split. The main trade-off is that it holds no dedicated allocation to gold, commodities, or real estate, so it offers less protection against inflation shocks or scenarios where stocks and bonds move together, and its performance is entirely a function of whatever stock/bond ratio the investor chooses.

Historical performance in context

The Three-Fund Portfolio captured the full ride of global markets: it participated in the 2008 decline through its equity sleeves but was buffered by bonds, and it rode the long post-2009 bull market via broad stock exposure. Its main relative drag has been the past decade's persistent US outperformance over international stocks, which caused globally diversified versions to trail US-only mixes — a gap that has historically reversed across cycles. In 2022 it fell as both stocks and bonds dropped together.

Common variations

The stock/bond ratio is the main lever — younger investors raise the equity share and glide it down over time along a glide path. Some drop international to a US-only stance (closer to a 60/40), while others add a fourth real estate fund to reach the Core Four. All versions are textbook lazy portfolios built on cheap index funds.

Risk Level

balanced

Rebalancing

annual

Number of Assets

3

Best For

Long-term investors wanting a smoother ride than all-equity

Before using this allocation

  • • Match the strategy's drawdown history to the amount of loss you could tolerate without abandoning the plan.
  • • Check whether its stock, bond, international, and inflation-sensitive sleeves address the risks that matter for your time horizon.
  • • Compare the same historical period and rebalancing rule against alternatives before changing a target allocation.

Related reading

Try This Strategy in the Simulator →

Or see the growth of $10,000 in the Three-Fund Portfolio (Bogleheads) over the past 30 years.

Hypothetical historical performance based on backtested data. Past performance does not guarantee future results. This site is for educational purposes only and does not constitute investment advice. Full disclaimer