Position Sizing Rules That Keep You in the Game on PSX

Almost every PSX retail trader who blows up their account did it via position sizing, not stock picking. They picked a good stock, went too big on it, one bad move wiped out gains from ten winning trades. The math is unforgiving.

This guide covers the position-sizing rules that let you take dozens of profitable trade attempts without ever risking the account itself. These are the rules that separate long-term survivors from casualties.

The math you need to understand

Drawdown recovery is asymmetric. If you lose 20% of your portfolio, you need +25% to break even. Lose 50%, you need +100%. Lose 70%, you need +233%.

The implication: avoiding large drawdowns matters far more than catching large winners. Position sizing is your primary control for drawdown magnitude.

Rule 1: The 1% rule (foundational)

Never risk more than 1% of your total portfolio on any single trade.

"Risk" means the difference between your entry price and your stop-loss, multiplied by position size.

Example: PKR 1,000,000 portfolio, 1% risk = PKR 10,000 max loss per trade. If your stop is 7% below entry, max position size = PKR 10,000 / 7% = PKR 143,000. If your stop is 10% below entry, max position size = PKR 10,000 / 10% = PKR 100,000.

The wider your stop, the SMALLER the position. This is counterintuitive to most retail traders — they buy a large position and set a wide stop, then bleed out slowly.

With 1% rule: you can be wrong 20 times in a row and still have 82% of your portfolio. With 5% per trade (typical retail sizing), the same 20 losses leave you with 36%.

Rule 2: Portfolio concentration cap

No single stock more than 15-20% of the total portfolio.

Even if you have massive conviction, some catastrophic event (fraud, delisting, regulatory action, force majeure) can hit any company. If that stock is 40% of your portfolio and it drops 60%, you lost 24% overnight.

For most retail investors:

Blue-chip anchor positions: 8-15% each
Mid-cap growth positions: 5-10% each
Small-cap speculative positions: 2-5% each
Cash reserve: 10-20% for tactical entries

A well-diversified retail PSX portfolio has 8-15 positions total. Fewer than 5 = concentration risk. More than 20 = you can't track them properly.

Rule 3: Sector concentration cap

No single sector more than 30% of the portfolio.

Even if you're bullish on banks, an SBP rate-cut cycle can drag the entire sector down 20% in weeks. If banks are 60% of your portfolio, you take a huge hit.

Typical sector caps for a diversified PSX portfolio:

Banking: max 25%
Oil & Gas E&P: max 20%
Cement: max 20%
Fertilizer: max 20%
Tech: max 15%
Any single small sector: max 10%

Rule 4: Correlation awareness

Two stocks in different sectors can still be highly correlated. Example: OGDC and PPL move together most days (both E&P, both government-owned, both foreign-flow sensitive). Owning both doesn't diversify — it double-concentrates.

Rule: if two of your holdings have >70% correlation over the last 60 days, treat them as ONE position for concentration purposes.

Rule 5: Volatility-adjusted sizing

A stock with 5% daily volatility should carry HALF the position size of a stock with 2.5% daily volatility, all else equal. Otherwise your daily portfolio swing from that position is disproportionate.

Simple rule: for volatile stocks (daily range >4%), cut position size to 50% of what you'd otherwise take. This includes most small-caps, sugar stocks, and pump-prone names.

Rule 6: Correlation with market direction

High-beta stocks (those that move 1.5x the KSE-100 on average) should be smaller positions than low-beta defensive names. Banking, cement, and tech tend to have beta > 1. Fertilizer, insurance, and utilities tend to have beta < 1.

A portfolio of only high-beta names is essentially a leveraged bet on the index. Fine if you have conviction, dangerous if you don't realize it.

Applying it all to a real PSX portfolio

Example: PKR 500,000 portfolio, diversified retail construction.

| Sector | Stock | Size | % | |---|---|---:|---:| | Banks | MEBL | PKR 60,000 | 12% | | Banks | MCB | PKR 40,000 | 8% | | Fertilizer | FFC | PKR 50,000 | 10% | | Fertilizer | EFERT | PKR 40,000 | 8% | | Oil & Gas | OGDC | PKR 60,000 | 12% | | Cement | LUCK | PKR 45,000 | 9% | | Cement | FCCL | PKR 30,000 | 6% | | Power | HUBC | PKR 35,000 | 7% | | Tech | SYS | PKR 25,000 | 5% | | Insurance | EFU | PKR 25,000 | 5% | | Cash reserve | — | PKR 90,000 | 18% |

Sector concentration check:

Banks: 20% ✓
Fertilizer: 18% ✓
Oil & Gas: 12% ✓
Cement: 15% ✓
Others: 5-7% each ✓

Single stock cap: max 12% ✓ Cash reserve: 18% ✓

This kind of portfolio can absorb almost any single-stock disaster or single-sector correction without threatening the account.

The rebalancing discipline

At the end of every month, check current allocations vs targets. If any position is now more than 130% of its target size (e.g., MEBL grew from 12% to 16%), trim back to target. If any is more than 70% of target (e.g., dropped from 12% to 8%), add back.

This simple mechanical rebalance forces you to sell winners high and buy laggards cheap — the opposite of what emotions want to do.

Compound effect over years

A disciplined 1%-per-trade portfolio with proper diversification, even at a modest 25% BUY win rate and average 7:7 target/stop:

Over 100 trades: expected +5-8% portfolio return without catastrophic drawdown
Over 1000 trades (~5 years of active trading): compound growth in the 50-80% range depending on execution quality

Compare to typical retail: high concentration + no stops + emotional exits produces 60-80% of retail traders LOSING money over 5 years.

Using PSX Invest

Our AI signal generation gives you the entry, target, and stop-loss levels. The position sizing math is up to you. Rule of thumb:

Note the entry price and stop-loss from our signal
Compute your 1% risk in PKR (portfolio × 0.01)
Position size = 1% risk / (entry - stop) as a percentage

Do this for every trade. Consistency compounds.

Bottom line

Position sizing is not glamorous, but it's what separates traders who're still trading in 5 years from those who blew up 3 years ago. The rules above aren't optional — they're the foundation.

Start with the 1% rule this week. Every new trade, compute the size properly. Track your actual sizing vs the rule for 30 trades. You'll see the discipline pay off in your account balance within 6 months.

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Position sizing rules should be adapted to your individual risk tolerance, time horizon, and total capital. Consult a licensed financial advisor for personalized guidance.