📖Joel Greenblatt
Annual Rebalancing
Rebalance annually based on new rankings.
Rebalance your portfolio annually based on the formula rankings. Dont trade too frequently.
🏠 Everyday Analogy
📖 Core Interpretation
Joel Greenblatt views portfolio construction as risk architecture. Allocation, position sizing, and rebalancing rules determine whether you can stay disciplined across market regimes.
💎 Key Insight：The magic formula requires discipline: sell last year's picks and buy this year's highest-ranked stocks, regardless of recent performance. This forces you to sell winners that have become expensive and buy losers that are now cheap. It feels counterintuitive but is essential to the strategy's success. Annual rebalancing captures mean reversion.
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❓ Why It Matters
Without portfolio rules, decisions become reactive and concentrated. Sustainable returns come from controllable risk exposure, not one-off bets.
🎯 How to Practice
Set target allocation by risk tolerance, rebalance by rules rather than headlines, and prevent hidden concentration from dominating portfolio behavior.
🎙️ Master's Voice
Spinoffs often create incredible opportunities because of forced selling.
Greenblatt is famous for spinoff investing. Index funds must sell spinoffs, creating temporary mispricings.
⚔️ Practical Guide
✅ Decision Checklist
- Is this a spinoff?
- Is there forced selling?
- Is it overlooked?
📋 Action Steps
- Monitor spinoffs
- Identify forced sellers
- Buy when overlooked
🚨 Warning Signs
- Ignoring spinoffs
- Missing forced selling
- Not researching
⚠️ Common Pitfalls
Diversifying superficially without true risk balance
Skipping rebalancing rules and drifting style
Judging portfolio health by short-term returns only
📚 Case Studies
1
Dot-Com Bubble Peak (2000)
Portfolio heavily tilted to soaring tech stocks after big gains in 1999.
✨ Outcome：Annual rebalance trimmed tech, added undervalued cyclicals; reduced subsequent crash losses and improved 5-year risk-adjusted returns.
2
Pre-Crisis Risk Trim (2008)
Strong run in financials and commodities made them oversized allocations by mid-2008.
✨ Outcome：Annual rebalance cut exposure and added defensives; drawdown in 2008–2009 was smaller and recovery to prior peak occurred faster.
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