The Core Four Portfolio — Rick Ferri's Simple 4-Fund Strategy for Investors

The Core Four Portfolio — Simplicity Meets Diversification

The Core Four Portfolio is a straightforward 4-fund investment strategy designed by Rick Ferri, one of the most respected voices in index investing. It allocates 40% to US stocks, 20% to international stocks, 20% to bonds, and 20% to REITs — providing broad diversification with minimal complexity.

Rick Ferri's philosophy is that most investors overthink their portfolios. They add complexity, chase performance, and pay unnecessary fees — all of which reduce returns. The Core Four captures 95% of the diversification benefit with just four low-cost index funds.

What makes the Core Four special is its pragmatic balance between simplicity and completeness. It's more diversified than a Boglehead three-fund portfolio (thanks to REITs) but simpler than a Swensen six-fund allocation. For investors who want "good enough" diversification without analysis paralysis, the Core Four hits the sweet spot.

Who Is Rick Ferri?

The Man Behind the Strategy

Rick Ferri is a former US Marine Corps fighter pilot turned financial advisor and author. After leaving the military, he earned his MBA and CFA charter, and spent decades advocating for index fund investing through his advisory firm, books, and media appearances.

Ferri's key publications include:

• "All About Asset Allocation" (2006, updated 2010) — his comprehensive guide that introduced the Core Four
• "The Power of Passive Investing" (2010) — making the case for index funds over active management
• "All About Index Funds" (2007) — practical guide to index fund selection

Ferri's Investment Philosophy

Ferri belongs firmly in the Boglehead school of thought (named after Vanguard founder John Bogle), but with a practical twist:

1. Keep it simple — complexity is the enemy of good returns
2. Keep costs low — every basis point in fees is lost return
3. Diversify broadly — across stocks, bonds, and real estate
4. Stay the course — rebalance mechanically, never emotionally
5. Add REITs — real estate is a distinct asset class that deserves its own allocation

The REITs addition is what distinguishes Ferri from the classic Boglehead approach. While Bogle himself was skeptical of dedicated REIT allocations (arguing they're already included in total stock market funds), Ferri believed that explicitly allocating to real estate provides meaningful diversification benefits.

The Core Four Allocation

The 40/20/20/20 Split

Why This Specific Allocation?

Ferri's allocation reflects several deliberate choices:

40% US Stocks:

• The US market represents roughly 60% of global market capitalization
• 40% slightly underweights the US vs. market cap, providing room for other asset classes
• Broad total market index includes large, mid, and small caps

20% International Stocks:

• Captures the other 40% of global equity markets
• Reduces home-country bias and US concentration risk
• Includes developed and emerging markets in one fund

20% Bonds:

• Provides stability and reduces overall portfolio volatility
• Acts as a counterweight during stock market downturns
• Intermediate-term bonds balance yield and interest rate sensitivity

20% REITs:

• Real estate provides returns driven by rental income and property values
• Low correlation with stocks and bonds over long periods
• Natural inflation protection through rising rents
• REITs must distribute 90% of income, providing consistent cash flow

The Simplicity Advantage

The Core Four's biggest strength is that anyone can understand and implement it. Compare the mental overhead:

Fewer moving parts means:

• Less likely to make rebalancing errors
• Less temptation to tinker
• Lower transaction costs
• Easier to stay the course during market stress

Historical Performance of the Core Four Portfolio

Long-Term Returns (1972–2025)

Note: Performance data is approximate and based on backtested results. Past performance does not guarantee future results.

The REIT Contribution

What does the 20% REIT allocation actually add vs. a simple three-fund portfolio?

The REIT allocation's value is episodic. It provides the most benefit when stocks are struggling and real estate is performing independently (2000-2006), but can hurt when real estate is the epicenter of a crisis (2008). Over full cycles, the diversification benefit is positive but modest.

Performance During Market Environments

ETF Implementation of the Core Four

European/UCITS ETF Implementation

Total portfolio cost: ~0.19% weighted average expense ratio

Simplified European Version

This 3-ETF version replaces the US/international split with a single global fund. You lose control over the US vs international weight, but VWCE is approximately 60% US anyway, which closely mirrors the 40/20 split.

US ETF Implementation

Total portfolio cost: ~0.05% weighted average expense ratio — one of the cheapest diversified portfolios you can build.

Key Implementation Notes

• Use accumulating (Acc) ETFs in Europe to avoid dividend withholding tax complications
• The bond allocation should be intermediate-term (total bond market), not long-term or short-term only
• REIT ETFs in Europe tend to be more expensive (0.40-0.59%) than US equivalents — this is the main cost drag
• Consider EUR-hedged bond ETFs if you want to reduce currency volatility on the fixed income portion

Core Four vs Other Strategies

Comparison Table

Core Four vs Boglehead Three-Fund

The Core Four is essentially the Boglehead three-fund portfolio plus REITs:

• Both share the same philosophy — low-cost, broadly diversified, passive index investing
• Core Four adds real estate as a distinct asset class, improving diversification
• Boglehead is simpler (3 funds vs 4) — some argue REITs are already included in total stock market index
• The REIT debate: REITs represent ~3% of the total stock market. A dedicated 20% allocation massively overweights real estate. Ferri argues this is intentional — real estate's diversification benefits require meaningful exposure

If you believe real estate is a distinct asset class worth overweighting → Core Four. If you prefer simplicity and market-cap weighting → Boglehead.

Core Four vs Swensen Yale

• Both include REITs (20%) — sharing the real estate conviction
• Swensen adds TIPS and separates equity exposure into three funds — more complex but more precise
• Core Four is simpler (4 funds vs 6) and easier to rebalance
• Swensen has slightly higher expected returns due to emerging market and TIPS allocation
• Core Four is the "80% solution" — captures most of Swensen's diversification with less hassle

Core Four vs 60/40

• Core Four adds real estate diversification that's entirely absent from 60/40
• Both have 60% equity exposure (Core Four: 40% US + 20% intl; 60/40: 60% US/global)
• Core Four has less bond exposure (20% vs 40%) — more volatile but higher expected returns
• Core Four is better during inflation (REITs) but less protected during deflation (fewer bonds)

Implementing the Core Four in Poland

Tax-Advantaged Accounts (IKE/IKZE)

Polish investors should maximize tax-advantaged accounts for the Core Four's highest-growth components:

IKE (Indywidualne Konto Emerytalne):

• Tax-free capital gains after age 60 (or 55 + 5 years of contributions)
• 2026 contribution limit: ~23,472 PLN
• Best for: US stocks and REITs (highest expected growth)
• Rebalancing is tax-free within the account

IKZE (Indywidualne Konto Zabezpieczenia Emerytalnego):

• Tax-deductible contributions + 10% flat tax at withdrawal
• 2026 contribution limit: ~9,388.80 PLN (~14,083.20 PLN for self-employed)
• Best for: Bond allocation (income is tax-advantaged)

Recommended Account Placement

Polish Broker Recommendations

Polish Alternatives for Bond Allocation

Instead of or alongside AGGH, Polish investors can consider:

• Polish Treasury Bonds (EDO, COI) — available through IKE/IKZE, no currency risk, inflation-linked
• DS (12-year fixed rate) — higher yield than EUR bond ETFs
• Money market funds — Polish TFI options like PKO Skarbowy for short-term stability

Mixing Polish bonds with global bond ETFs provides currency diversification — you're hedging against both PLN and EUR/USD scenarios.

Rebalancing the Core Four

Rick Ferri's Rebalancing Approach

Ferri recommended a simple, calendar-based rebalancing approach:

1. Check your allocation once per year (e.g., in January or on your birthday)
2. If any position has drifted more than 5 percentage points from target, rebalance
3. Use new contributions to rebalance whenever possible (cash flow rebalancing)
4. If rebalancing through contributions isn't enough, sell overweight positions and buy underweight ones

Practical Rebalancing Example

Starting portfolio: 100,000 PLN

• US Stocks: 40,000 PLN (40%)
• Intl Stocks: 20,000 PLN (20%)
• Bonds: 20,000 PLN (20%)
• REITs: 20,000 PLN (20%)

After one year, market changes have caused drift:

• US Stocks: 52,000 PLN (46%) → overweight by 6%
• Intl Stocks: 21,000 PLN (19%) → close to target
• Bonds: 19,500 PLN (17%) → underweight by 3%
• REITs: 20,500 PLN (18%) → underweight by 2%
• Total: 113,000 PLN

Rebalancing action:

• Sell 6,800 PLN of US Stocks (reduce to 45,200 = 40%)
• Buy 1,600 PLN of Intl Stocks (increase to 22,600 = 20%)
• Buy 3,100 PLN of Bonds (increase to 22,600 = 20%)
• Buy 2,100 PLN of REITs (increase to 22,600 = 20%)

In IKE/IKZE, this entire process is tax-free.

Who Should Use the Core Four?

Ideal For

• Investors who want more diversification than 60/40 but less complexity than Swensen — the Core Four is the perfect middle ground
• Boglehead investors considering REITs — if you already run a three-fund portfolio and want to add real estate, the Core Four shows you how
• Beginners who want a "graduate-level" portfolio — it's simple enough to understand immediately but sophisticated enough to last a lifetime
• People who hate rebalancing — four funds with clear weights means minimal maintenance
• Investors who believe in real estate as a distinct asset class worth owning

Less Ideal For

• Ultra-conservative investors — 60% equity exposure means significant drawdowns in crashes
• Investors who want inflation protection beyond REITs — no gold, TIPS, or commodities
• Those who prefer market-cap weighting — 20% REITs is a massive overweight relative to their ~3% share of total market cap
• Investors who already own physical real estate — additional REIT exposure may over-concentrate you in real estate

Building and Tracking Your Core Four

Getting Started

1. Open accounts — IKE + IKZE at XTB or Bossa for Polish investors
2. Decide on your total investment amount
3. Split it 40/20/20/20 across the four funds
4. Purchase the ETFs — start with the largest allocation (US stocks) first
5. Set an annual rebalancing calendar reminder
6. Invest new money into underweight positions each month

Track Your Core Four Portfolio in Freenance

Track your Core Four portfolio in Freenance — use our built-in preset to set it up in seconds. Freenance automatically monitors your 40/20/20/20 allocation across all four asset classes and shows you exactly where to invest new contributions.

With Freenance, you can:

• Import holdings from XTB, Revolut, mBank, and other Polish brokers
• See your actual vs. target allocation at a glance
• Get rebalancing alerts when any position drifts beyond 5%
• Track performance against the S&P 500, 60/40, and other benchmarks
• Monitor your Financial Freedom Runway — how long your Core Four portfolio could sustain your lifestyle

Customizing the Core Four

Adjusting for Age and Risk Tolerance

Ferri's 40/20/20/20 is a starting point. You can adjust based on your situation:

Notice the REIT allocation stays at 20% across all profiles — Ferri believed real estate's income and diversification benefits are valuable at every life stage.

Adding a Fifth Fund

If you want to expand the Core Four, Ferri suggested:

• Adding TIPS (inflation-protected bonds): Split the 20% bond allocation into 10% nominal bonds + 10% TIPS
• Adding emerging markets: Split the 20% international allocation into 15% developed + 5% EM
• This creates a "Core Five" or "Core Six" — essentially converging with Swensen's model

Frequently Asked Questions

Why 20% in REITs when they're already in the stock market?

REITs represent about 3% of the total stock market index. A 20% allocation is a deliberate overweight — Ferri's argument is that real estate is a massive asset class ($300+ trillion globally) that deserves more than 3% representation. REITs provide rental income, inflation protection, and a return stream that doesn't perfectly correlate with stocks. However, critics argue this overweight concentrates sector risk. Both views have merit.

Is the Core Four better than a target-date fund?

For engaged investors, yes. Target-date funds charge higher fees (0.10-0.75% vs ~0.19% for Core Four), follow a generic glide path, and don't include dedicated REIT exposure. The Core Four gives you more control, lower costs, and better diversification. The tradeoff is that you need to rebalance yourself annually.

How should I handle the bond allocation in a rising rate environment?

Intermediate-term bonds (like BND or AGGH) will lose value when rates rise, but less than long-term bonds. Ferri's advice was to stay the course — bond prices fall when rates rise, but higher rates mean higher future yields. Over a full rate cycle, total return tends to be positive. Don't abandon bonds just because rates are rising.

Can I use VWCE instead of separate US and international funds?

Absolutely. Using VWCE for 60% of the portfolio and keeping REITs (20%) and bonds (20%) separate gives you a 3-fund version of the Core Four. You lose precise control over US vs international weighting, but the simplification is worth it for most investors. This is essentially the "simplified European version" described above.

What's the difference between Core Four and the Coffeehouse Portfolio?

The Coffeehouse Portfolio (by Bill Schultheis) uses 7 funds with a similar philosophy but more granular equity exposure (separating large value, small cap, small value, etc.). The Core Four achieves similar diversification with fewer funds. Both include REITs. Choose Core Four if you prefer simplicity; Coffeehouse if you want more factor exposure.

Conclusion

The Core Four Portfolio embodies Rick Ferri's belief that great investing doesn't have to be complicated. With just four low-cost index funds covering US stocks, international stocks, bonds, and real estate, you get broad diversification across major asset classes and economic environments.

The portfolio's strength is its pragmatic simplicity. It's more diversified than a basic 60/40 or Boglehead three-fund approach thanks to the dedicated REIT allocation, but simpler than the Swensen or All Weather models. For investors who want a "set it and forget it" portfolio with real estate exposure, the Core Four is hard to beat.

For Polish investors, the Core Four is particularly attractive. With commission-free ETFs at XTB, tax-advantaged IKE/IKZE accounts, and just four funds to manage, you can build and maintain a professionally designed portfolio with minimal effort and cost.

Ready to build your Core Four Portfolio? Track your Core Four portfolio in Freenance — use our built-in preset to set it up in seconds and monitor your allocation across stocks, bonds, and real estate.

Related Articles

• The All Weather Portfolio — Ray Dalio's Strategy for Every Market Condition
• The 60/40 Portfolio — Classic Stocks vs. Bonds Strategy in 2026
• The Boglehead Portfolio — Jack Bogle's Investment Philosophy for 2026
• The Swensen Yale Portfolio — David Swensen's Endowment Model for Individual Investors