Portfolio Rebalancing

Portfolio rebalancing is the process of buying and selling assets to return a portfolio to its target allocation. As markets move, winners grow and losers shrink, so the portfolio drifts away from the mix of stocks, bonds, and other assets you originally set.

Advisors rebalance to control risk and stay aligned with each client's investment policy — an unchecked portfolio can quietly become far more aggressive than intended. Disciplined rebalancing also enforces a "buy low, sell high" habit that emotion tends to override.

Modern investment management software automates this at scale. Rather than review hundreds of accounts by hand, you set drift tolerances and let the rebalancer flag or trade every account that breaches them.

Common rebalancing triggers include:

• Calendar-based — on a fixed schedule, such as quarterly
• Threshold-based — when an asset class drifts past a set band
• Cash-flow driven — when deposits or withdrawals let you rebalance without extra trades

Good rebalancers also coordinate with tax rules and household-level asset location.