Five Portfolio Mistakes We See Every Client Make Once

1. Mistaking overlap for diversification

Ten mutual funds that all hold the same twenty large-cap names aren’t ten bets — they’re one bet, wearing ten costumes. We routinely find portfolios with 60–70% overlap in top holdings across “different” funds.

2. Sizing positions by conviction, not by risk

A stock someone feels strongly about often ends up 3–4x the size it should be relative to its volatility. Conviction is a reason to research more, not a reason to size bigger.

3. No plan for what triggers a sale

Most portfolios have a clear entry rationale and no exit rationale at all. Without a predefined trigger, decisions get made emotionally, usually at the worst possible time.

4. Ignoring tax drag until it’s too late

Frequent churn inside a portfolio quietly erodes returns through short-term capital gains tax. We see this most in portfolios that were actively traded during a strong bull run.

5. Treating asset allocation as a one-time decision

An allocation that was right at 35 with a 20-year horizon is rarely still right at 55 with a 5-year horizon. Rebalancing on a schedule — not just when markets move — is what keeps the original plan intact.