Options Basics for Prop Traders: Calls, Puts and the Greeks

An option is a contract that gives its buyer the right, but not the obligation, to transact an underlying asset at a specified price within a specified period. Two fundamental types:

A call option gives the buyer the right to buy the underlying at the strike price. A trader expecting SPX to rally can buy a 5,500-strike SPX call: if SPX settles above 5,500 at expiration, the call has value (SPX − 5,500). If SPX settles below 5,500, the call expires worthless and the only loss is the premium paid.

A put option gives the buyer the right to sell at the strike. A trader expecting SPX to fall or wanting to hedge a long position can buy a 5,500-strike put: value at expiration is max(5,500 − SPX, 0).

Every option has four contract terms: underlying (what can be bought or sold), strike (at what price), expiration (until when), and style (American = exercisable any time before expiration, European = only at expiration). US equity options are mostly American; European-style options are common on index futures (SPX, NDX) and FX.

An option's price (the premium) has two parts:

Intrinsic value is how much the option would be worth if exercised immediately. A call with a 100 strike when the stock is at 107 has intrinsic value of 7. A put with a 100 strike when the stock is at 107 has intrinsic value of 0 (the put is "out of the money"). Intrinsic value cannot be negative.

Extrinsic value (time value) is everything above intrinsic – the premium traders pay for the possibility that the option will move further into the money before expiration. Extrinsic reflects remaining time and expected volatility. As expiration approaches, extrinsic decays toward zero. An option's total premium at any moment = intrinsic + extrinsic.

Three standard status terms based on the relationship of current price to strike:

ITM (in-the-money): call strike below spot, or put strike above spot. Has intrinsic value.

ATM (at-the-money): strike approximately equal to spot. Maximum extrinsic, zero intrinsic.

OTM (out-of-the-money): call strike above spot, or put strike below spot. Zero intrinsic, only extrinsic.

OTM options are the cheapest premium but require the largest price move to become profitable. ITM options cost more up front but behave more like a direct position in the underlying.

The Greeks are derivatives of the Black-Scholes option pricing formula (or Black 1976 for futures options) that quantify how an option's price responds to changes in market conditions. The core five:

Delta (Δ). Sensitivity to underlying price. Ranges from 0 to 1 for calls, 0 to −1 for puts. An ATM call has delta ≈ 0.5 (the option moves ~$0.50 for every $1 move in underlying). Deep ITM call approaches 1 (moves like the underlying). Deep OTM call approaches 0.

Gamma (Γ). Rate of change of delta. Highest for ATM options near expiration. A call with delta 0.50 and gamma 0.05 will see its delta rise to 0.55 if the underlying gains $1.

Theta (Θ). Time decay – how much premium the option loses per day from the passage of time alone. Theta is negative for long options (you lose value as time passes). A call with theta −0.15 loses $0.15 per day holding all else constant. Theta accelerates sharply in the last 30 days before expiration.

Vega (V). Sensitivity to implied volatility. An option with vega 0.30 gains $0.30 if implied vol rises by 1 point (e.g., from 20% to 21%). Long options are long vega; short options are short vega.

Rho (ρ). Sensitivity to interest rates. Usually small except for long-dated options. Calls have positive rho; puts have negative rho.

A professional options trader monitors all five simultaneously because a position can hedge one Greek while remaining exposed to another. A "delta-neutral" short straddle is still short vega and long theta – it makes money on time decay and calm markets but loses on volatility expansion.

The four fundamental positions at expiration (ignoring premium for clarity):

Everything in options – verticals, iron condors, butterflies, calendars – is a combination of these four primitives. Understanding the four payoff shapes and their net-Greeks properties is most of the intuition needed for more complex strategies.

Implied volatility (IV) is the volatility number that, when plugged into the option pricing model, produces the current market price of the option. It is an implied quantity, not an observed one – it is what the market "thinks" the volatility of the underlying will be over the option's life.

IV is quoted in annualised percentage terms. An IV of 20% means the market expects the underlying to move roughly ±20% at a 1-sigma confidence over the next year (or the option's time horizon). Equity indices typically trade 15-25% IV in calm markets and spike to 40-70% in crises.

Two important IV concepts for prop traders:

IV rank. Current IV relative to its 1-year range. IV rank 90 means current IV is near its 12-month highs – options are "expensive". IV rank 10 means it is near lows – options are "cheap". Option sellers look for high IV rank; option buyers look for low IV rank.

IV skew. Different strikes have different IVs. For equity indices, OTM puts trade at higher IV than OTM calls because the market pays more for downside protection. This skew is normal and priced in; extreme skew is a warning signal about market stress.

The most common useful application of options for a prop trader who is primarily a futures or directional trader is hedging. Two patterns:

Protective put against a long underlying. Holding a long ES futures position, buy an OTM SPX put or SPY put. The put pays off if the market crashes while the futures are still open. Costs premium; limits downside to the strike level (minus premium). Simple, effective, widely used.

Collar: long put + short call. Buy a protective put; finance it by selling a call above current price. Defines both upside cap and downside floor on the position. Costs little or nothing net premium. Useful for defined-range positions around a known event (earnings, Fed decision).

For FX traders, the same logic applies using CME FX options or OTC currency options from a prime broker. A trader long AUD/USD concerned about an RBA rate decision could buy an AUD/USD put to cap downside.

The general principle: options add convexity. Your position's P&L becomes non-linear in the underlying. For traders who want to define tail risk precisely, options are the cheapest way; simply reducing position size achieves a similar effect but gives up upside participation.

For most prop firms focused on futures, FX, or CFDs, options are not included in the standard evaluation product. Reasons:

Risk is non-linear. Firms' daily drawdown and max drawdown rules assume linear exposures. An option's delta changes with underlying movement (gamma), so "stop loss" discipline is different from futures. Easier to disallow than to build sophisticated risk systems for retail evaluations.

Premium capital requirements. Buying a put requires paying full premium upfront – counted against the account's buying power. Selling a put requires margin in some frameworks that can exceed the risk the account is sized for.

Assignment risk. American-style options can be assigned early. A short call on a stock near ex-dividend date can be exercised, leaving the seller short-stock and facing unlimited risk.

A minority of prop firms specialise in options – usually with dedicated accounts, options-specific rules, and often higher capital commitments from the trader. Tastytrade Academic, SMB Capital (historically), TradeStation proprietary, and a few smaller specialists offer options-focused paths. If options are central to your intended strategy, verify firm support before committing.

For cross-asset hedging, some firms allow futures options (e.g., options on ES or CL) even in evaluations that are "futures only" – but this varies. Always check the specific instrument list.

1. Long call / long put. The directional bets. Defined risk (premium paid), potentially unlimited upside (call) or capped-but-large upside (put, up to strike).

2. Covered call. Own 100 shares, sell an OTM call against them. Generates premium income; caps upside at the strike. The most common retail options position.

3. Cash-secured put. Sell an OTM put, holding cash to cover the potential assignment. Generates premium; obligates you to buy the underlying at the strike if exercised. A pre-commitment to buy at a lower price while earning income.

4. Vertical spread (bull call / bear put / etc.). Buy one option and sell another at a different strike of the same expiration. Defined risk and reward. Less directional exposure than outright long options, cheaper premium, capped upside.

5. Iron condor. A short put spread + short call spread on the same expiration. Profits if the underlying stays within a range. Short vega, long theta – time is your friend, volatility is your enemy.

6. Calendar spread. Buy a longer-dated option and sell a shorter-dated option of the same strike. Profits from differential time decay. Used to express a view on volatility rather than direction.

Each has specific Greek profiles and typical market conditions where it performs. Serious options study is a career in itself; this article intentionally stays at primer level.

Mistake 1: buying OTM options hoping to "get rich". Far-OTM options are cheap but win rarely. Most expire worthless. Use OTM strategically (for convexity on specific catalysts), not as a default.

Mistake 2: ignoring theta. Buying a long option and holding it patiently "waiting for the move" – while theta bleeds the premium every day. Long options need the move soon. Time is always working against the buyer.

Mistake 3: misunderstanding assignment risk. Selling a put "for premium income" then being assigned 100 shares at the strike – which is now well above market price – can wipe out a small account. Cash-secured only, always.

Mistake 4: treating IV as price prediction. High IV means expected volatility is high, not that price will go up. It quantifies the range of expected moves, not the direction.

Mistake 5: ignoring liquidity. A thin options contract with a 5¢ bid-ask spread and 0.20 bid-ask percentage destroys edge. Trade only high-liquidity options – SPX, SPY, QQQ, NVDA, AAPL – where bid-ask is tight.