Portfolio Rebalancing Systematics
How systematic rebalancing keeps portfolio weights at target allocations, the math of why rebalancing produces an excess return in volatile markets, and on-chain rebalancing protocols.
What Rebalancing Is
If you set a target portfolio of 50% BTC, 30% ETH, 20% USDC, prices will quickly push the actual weights away from target. After a BTC rally, BTC might be 60% of the portfolio; after an ETH rally, ETH might be 40%. Rebalancing means selling the over-weighted assets and buying the under-weighted to restore target allocation. Done systematically (e.g., quarterly or when weights drift more than 5%), rebalancing maintains the original risk profile and forces 'sell high, buy low' behaviour.
Why Rebalance
Without rebalancing, your portfolio drifts toward whatever asset performs best. After a major rally, you'll be heavily overweight that asset — exposed to its drawdown. Rebalancing limits this. It also captures a small expected excess return in volatile markets called the 'rebalancing premium' — selling assets that have appreciated locks in gains; buying assets that have depreciated buys at lower prices. This isn't free money (it requires selling appreciating assets, capping upside), but it's structurally positive in volatile markets.
Methods
Two main approaches. **Calendar rebalancing**: rebalance at fixed intervals (monthly, quarterly, annually). Simple, predictable, but may rebalance when not needed or fail to rebalance when needed. **Threshold rebalancing**: rebalance when weights drift more than X% from target. Captures actual drift; requires monitoring. Most production approaches combine both — rebalance quarterly and also when drift exceeds threshold.
- Set target weights; restore them periodically as prices change
- Maintains the original risk profile
- Forces sell-high, buy-low behaviour systematically
- Calendar (fixed intervals) vs threshold (drift triggers) vs hybrid approaches
Key Takeaways
- Rebalancing maintains target portfolio weights as prices change
- Without it, portfolios drift toward whatever asset is performing best
- Captures a small 'rebalancing premium' in volatile markets
- Calendar + threshold hybrid is the standard production approach
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