Concept: Diversification
Diversification means spreading investments across multiple assets so that a loss in one doesn't destroy your entire portfolio. It's not about maximising ret...
What it is
Diversification means spreading investments across multiple assets so that a loss in one doesn't destroy your entire portfolio. It's not about maximising returns — it's about ensuring you survive mistakes and bad luck.
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"Saare ande ek basket mein mat rakhna — yeh diversification hai. Agar ek basket gir bhi jaye, toh baaki ande safe hain."
Why it matters
- You WILL be wrong — Even the best investors have a 60-65% hit rate. Diversification ensures the 35% losers don't wipe you out
- Black swans exist — Satyam, Yes Bank, DHFL — any single stock can go to zero
- Reduces volatility — A diversified portfolio lets you sleep at night; concentration gives heart attacks
- Preserves capital — A 50% loss requires 100% gain just to break even. Diversification prevents 50% losses
The math of ruin
| # of stocks | Chance of one going to zero | Portfolio impact if it does |
|---|---|---|
| 1 stock (100%) | Any fraud/failure = total loss | -100% |
| 5 stocks (20% each) | Same event | -20% |
| 10 stocks (10% each) | Same event | -10% |
| 20 stocks (5% each) | Same event | -5% |
The goal: No single mistake should cost you more than 5-10% of your portfolio.
Types of diversification
1. Stock diversification (most common)
Own 12-25 stocks instead of 1-5:
- Too few (< 8): One failure hurts badly
- Sweet spot (12-20): Meaningful positions with adequate safety
- Too many (> 30): Becomes an expensive index fund; you can't track them all
2. Sector diversification
| Bad portfolio | Better portfolio |
|---|---|
| 5 banking stocks | 3 banking + 2 IT + 2 FMCG + 2 industrial + 1 pharma |
| "I like infra" — 8 infra stocks | Infra exposure limited to 20% of portfolio |
Rule of thumb: No single sector > 25% of portfolio. No more than 3 stocks from the same sector.
3. Market-cap diversification
| Category | Allocation idea | Why |
|---|---|---|
| Large-cap | 40-60% | Stability, liquidity, lower risk |
| Mid-cap | 25-35% | Growth potential with moderate risk |
| Small-cap | 10-25% | High growth but high volatility |
4. Style diversification
Mix of growth stocks + value stocks + dividend stocks provides different return profiles across market conditions.
The concentration vs diversification debate
Indian-specific diversification rules
- PSU concentration risk — Many investors overload on PSU stocks during govt-push themes. Remember: policy can reverse overnight
- Group concentration — Owning Tata Steel + TCS + Titan + Tata Motors = high group risk (all Tata group)
- Thematic concentration — "India growth story" ≠ owning 10 capex/infra stocks. Themes rotate
- MF overlap — 4 mutual funds may all hold the same top 20 stocks. Check overlap before thinking you're diversified
Common mistakes
Mistakes to avoid
- Diworsification — Owning 50 stocks you can't track dilutes winners and still loses on bad picks
- False diversification — 10 stocks in the same sector is NOT diversified
- Equal weighting everything — Your highest-conviction ideas deserve larger positions
- Not diversifying across time — SIP/staggered investing protects against timing risk
- Ignoring correlation — If all your stocks go down together in a crash (banks + NBFCs + real estate), they weren't really diversified
Position sizing guide
| Conviction level | Position size | Example |
|---|---|---|
| Highest conviction + strong moat | 8-10% | Asian Paints, HDFC Bank |
| High conviction | 5-8% | Quality business, reasonable price |
| Moderate conviction | 3-5% | Good business, not deeply researched |
| Tracking position (watching) | 1-2% | Wants to learn the business before scaling |
Related concepts
- Position Sizing — How much to allocate per stock
- Margin of Safety — Even diversified portfolios need valuation discipline
- Circle of Competence — Diversify within your circle, not randomly across everything