Skip to main content

Five Portfolio Mistakes We See Every Client Make Once

After reviewing thousands of portfolios, the same five structural mistakes keep showing up — and they're all fixable before they cost real money.

Deepak Shenoy5 min read
Quick Facts
Should I diversify by holding multiple funds?
No, holding multiple funds with overlapping top holdings (e.g., 60–70% overlap) doesn't diversify — it's one bet in ten costumes. Focus on unique holdings rather than quantity.
How to size positions based on risk?
Size positions by risk, not conviction. A stock someone feels strongly about often ends up 3–4x the size it should be relative to its volatility. Research more, but avoid overexposure.
What triggers a sale in a portfolio?
A clear exit rationale is critical. Most portfolios lack predefined triggers, leading to emotional decisions at the worst times. Define triggers upfront to avoid panic selling.
How to avoid tax drag in investments?
Minimize frequent trading to avoid short-term capital gains tax. Actively traded portfolios during bull runs suffer from tax drag, eroding long-term returns silently.
Why is asset allocation important?
Asset allocation must adapt to changing horizons. An allocation right at 35 with a 20-year horizon is rarely suitable at 55 with a 5-year horizon. Rebalance on a schedule, not just when markets move.

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.wweqweqweperson-img1.png

Who We Serve — Guided Portfolio Management / NDPMS (glass blocks)