Biggest Option Trading Mistakes — And How to Fix Them

Mistake 1: Oversizing After a Win Streak

Three green days convince traders they found the holy grail. Lot size jumps from 1 to 5. The fourth day — a normal loss — wipes the streak plus principal because theta and one wrong direction hit larger exposure. Position size should follow capital rules, not ego temperature.

Fix: fixed rupee risk per trade from risk management playbook. Never scale after wins without recalculating risk budget.

Mistake 2: Buying OTM Lottery Tickets

Cheap OTM options feel affordable — 'only ₹15 premium'. But delta is tiny; the index must sprint for premium to double. Expiry week theta eats them hourly. Most OTM buys expire worthless statistically.

Fix: trade ATM or defined spreads when you have directional conviction. Reserve small OTM size for explicit breakout or event plays with planned exit.

Mistake 3: Ignoring the Option Chain

Chart-only traders enter calls into call OI walls without knowing writers defend above. They buy puts when short covering already fired. Price is half the story on index options.

Fix: morning chain review — highest OI strikes, overnight change, PCR. Enter where structure supports thesis.

• No stop loss — hope holding until expiry
• Revenge trading after red morning
• Trading budget day like a normal Thursday
• Skipping journal — repeating same errors monthly

Mistake 4: Expiry Day Gambling

Buying ₹5 OTM options at 2 PM on expiry because 'something will happen' is donating to theta. Expiry day rewards preparation and punishes improvisation.

Fix: if you trade expiry, use liquid strikes, smaller size, and morning plan. Otherwise observe and study expiry statistics.

Building Better Habits

Mistakes are universal; repetition is optional. A trading journal, platform tools for OI and patterns, and willingness to sit out bad days compound into skill.

Every experienced trader has a mistake list — the difference is they stopped paying tuition for the same lesson.