
How Often Should You Rebalance Your Portfolio
Vanguard's research found annual and threshold rebalancing produced nearly identical long-run results — the point is having bands at all, not tuning them.
Portfolios addresses the whole rather than the parts: hidden overlap between funds, how many positions add genuine diversification, geographic concentration, and a rebalancing schedule realistic for somebody with a full-time job. Suited to investors owning several holdings who suspect they are less diversified than they look.
Building a coherent set of positions: fund overlap, correlation, position count, home bias, and a rebalancing schedule that survives a busy year.

Vanguard's research found annual and threshold rebalancing produced nearly identical long-run results — the point is having bands at all, not tuning them.

Three index funds can still mean one giant bet on the same handful of mega-caps — overlap analysis reveals concentration no single fund page admits.

Classic research says twenty to thirty names capture most diversification — and newer evidence on skewness argues for simply owning the whole index.