How to Diversify Your Investment Portfolio

Step 0 — Why diversify

Diversification aims to avoid depending on a single bet. If one asset falls, others may hold or rise.

What it does and doesn’t do:

• it reduces specific risk (a company, a sector, a country)
• it reduces the impact of a single mistake
• it doesn’t remove market risk (global shock)
• it doesn’t guarantee a return

To note before starting:

• horizon (1 year, 5 years, 10 years)
• tolerance for drops (accept -20%, -40%?)
• amount and frequency of contributions

Step 1 — Asset classes

The first building block of diversification is to mix classes that don’t react the same way:

• stocks (growth, more volatile)
• bonds (often more stable, sensitive to rates)
• cash / money market (liquidity, cushion)
• commodities / gold (partial hedge depending on periods)
• crypto (very volatile, optional)

A 100% equity portfolio is diversified among stocks but remains exposed to a single class.

Step 2 — Regions and sectors

Within equities, avoid concentrating everything:

• regions: don’t limit yourself to a single country
• sectors: avoid being 100% tech or 100% one theme
• size: large vs small caps

A global ETF already covers many regions and sectors, which simplifies this work.

Step 3 — Correlations

Useful diversification means combining assets with low correlation:

• two assets that rise and fall together diversify little
• assets with different behaviors smooth the curve
• caution: correlations change in periods of stress

Adding ten positions from the same sector doesn’t really improve diversification.

Step 4 — Set an allocation

Set a target allocation in percentages, simple and sustainable:

• share of stocks / bonds / cash
• possibly a small optional share (gold, crypto)
• clear rules you can follow without constantly thinking about it

Write it down: an unwritten allocation drifts with emotions.

Step 5 — Rebalancing

Over time, the proportions drift (the asset that rises takes up too much space).

Two common approaches:

• by calendar: check every 6 or 12 months
• by thresholds: rebalance when a share exceeds a margin (e.g. +/- 5 points)

Rebalancing forces you to sell a bit of what has risen and buy back what has fallen, which keeps the intended risk profile.

Step 6 — Crypto in a portfolio

If you include crypto:

• treat it as a small volatile share
• take care of custody / security (2FA, tested withdrawals)
• decide the limit in advance and rebalance if it surges

Crypto can diversify or concentrate risk depending on the weight given.

Example allocation

Illustrative example (not advice) of a balanced profile:

• 60% stocks (including a global base)
• 25% bonds / money market
• 10% safety cash
• 5% optional (gold, crypto)

Adapt to horizon and tolerance: a short horizon often reduces the equity share.

Quick decision tree

• Everything in a single asset? → concentrated risk, consider broadening.
• Only stocks? → diversified in equities, but a single class.
• Many highly correlated positions? → simplify, it doesn’t really help.
• Allocation that has drifted? → rebalance toward the target.

Checklist

• [ ] Need, horizon, and tolerance written down
• [ ] Several asset classes
• [ ] Regions and sectors spread out
• [ ] Low-correlation assets combined
• [ ] Target allocation in percentages
• [ ] Rebalancing rule defined
• [ ] Crypto share capped (if included)

Common beginner mistakes

• False diversification: ten positions from the same sector.
• Concentration on a trendy theme.
• Forgetting currency or region risk.
• Never rebalancing and letting one asset dominate.
• Over-diversifying to the point of no longer tracking anything.
• Confusing diversification with the absence of risk.

Diversification is a risk management tool, not a promise of gains. This content is informational — read the disclaimer.