Self-directed traders and investors do not need to look far as they educate themselves about options to encounter “The Greeks.” These metrics gauge how sensitive an option’s price is to various factors. The primary Greeks include Delta, Gamma, Theta, Vega, and Rho. Delta indicates an option’s price sensitivity to the underlying asset’s price changes. Gamma indicates the rate at which Delta changes relative to the underlying asset’s price changes. Theta indicates how much value the option loses each day. Vega indicates an option’s sensitivity to changes in the underlying asset’s implied volatility. Rho indicates how sensitive an option is to changes in the “carry cost,” such as interest rates and any applicable dividends paid by the underlying asset before the option expires. The underlying asset’s price movement is usually the biggest driver of changes in the price of an option at any given moment, so we’ll start with “Delta,” which helps us quantify the relationship between changes in the price of the underlying asset and the value of the option. “Delta” is also helpful for another reason. “Delta” estimates the probability of a move of a given magnitude in the underlying price by an option’s expiration date as implied by the current options price. Delta (Δ) estimates how much an option’s price will likely change for every $1 move in the underlying asset’s price — usually expressed as a value ranging from -1 to +1. Call options, which grant the right to buy an underlying asset at a specific price, will have a Delta between 0 and 1. Deep-in-the-money options will have a Delta value close to 1, indicating the value of the call option will behave very similar to the underlying stock itself, experiencing almost a one-to-one price movement. Far-out-of-the-money call options will have a Delta value close to 0 and a very low sensitivity to underlying asset price changes. At-the-money call options will have a delta of about 0.50, meaning if the price of the underlying rises by $1, their value would increase by half that or fifty cents. Conversely, put options, which provide the right to sell an asset, will have a Delta between 0 and -1. A Delta approaching -1 indicates that the put option is deep in the money and will move almost inversely to the underlying stock. A Delta around -0.5 usually points to an at-the-money put option where the option’s price will move at roughly half the rate of price movements of the underlying asset but in the opposite direction . Lastly, a Delta value near 0 signifies that the put option is out-of-the-money and will exhibit virtually no price sensitivity to movements in the underlying asset. Beyond indicating price sensitivity, the absolute value of an option’s Delta can also be interpreted as the approximate probability that the option will expire “in the money.” For instance, a call option with a Delta of 0.30 suggests an approximate 30% chance of being in the money at expiration. While this interpretation provides a helpful rule of thumb, it is important to remember that it is an estimation, not a definitive prediction. Suppose our analysis suggests the probability of a move is higher (or lower) than that implied by the options Delta. In that case, that may serve as one of the indicators, along with our technical and fundamental assessment of whether that option should be bought or sold. The trade Delta Airlines is the first Russell 1000 constituent stock to report its Q1 2025 quarterly earnings results on April 9, pre-market (see what I did there?). The company will hold a webcast discussing those results at 10 AM ET that same morning. Delta outperformed the broad market in 2024, achieving a full-year total return of 52%. However, it ranks among the bottom 5% of stocks in the Russell 1000 this year, declining by 27.4%. There are several reasons for the recent weak performance. For one, the S & P has recently entered correction territory, and Delta is a relatively high-beta stock. Eight analysts covering the stock have also recently reduced their price targets. Additionally, contract negotiations have led to higher wage costs, which could be compounded by pilot retirements amidst a general pilot shortage in the industry. Trading just over 6.2x FY2025 EPS estimates, anticipated FY free cash flow is greater than 8% of the current enterprise value. There’s quite a lot of bad news priced into the stock already. If we look at the May expiration, we can see that the “at-the-money” straddle (the May $44 call plus the May $44 put) costs about $6.30. This represents the options market’s “expected move” between now and May expiration, between $37.54 and $50.14 or ~14% of the current stock price. A quick review of post-earnings price moves for Delta over the past 44 reported quarters illustrates that moves of that size over a comparable window of time — May expiration is over six weeks away — are pretty rare. The 11-year average is about 8.7%. The chart below illustrates the historical movements in Delta’s share price over time frames comparable to that between now and May expiration (the blue bars) and between now and July expiration (the yellow highlighted bars). The horizontal blue lines indicate the boundaries of the move currently implied by May options. You will notice that moves greater than those implied over time scales similar to that between now and May options are rare, particularly to the downside. The most recent real disappointment occurred when they reported their Q2 24 results last July. To apply that data plus what we’ve learned about Delta (the Greek), consider the following Delta (the airline stock) trade going into earnings. Buy DAL July 18 $50 call Sell DAL May 16 $50 call Sell DAL May 16 $38 put One could affect this trade at a minimal cost, ~$.25 per spread as/of Friday’s closing prices. This trade would be profitable if the stock appreciates to, or even well through, the $50 strike price as of May expiration (although there may be opportunities to take the trade off profitably before the expiration date). To the downside, one risks getting long the stock at the short $38 strike, but how great a risk is that? Let’s apply what we learned about delta. The probability that an option expires in the money is roughly equivalent to the absolute value of the option delta. In this case, the delta of the downside put is -.2, and the absolute value is .2 or 20%. Put differently, the probability that the trade loses money as of May expiration, assuming one holds it until then, is only 20%, as implied by current option prices. It’s not a sure thing, but those odds look pretty good. Get Your Ticket to Pro LIVE Join us at the New York Stock Exchange! Uncertain markets? Gain an edge with CNBC Pro LIVE , an exclusive, inaugural event at the historic New York Stock Exchange. In today’s dynamic financial landscape, access to expert insights is paramount. As a CNBC Pro subscriber, we invite you to join us for our first exclusive, in-person CNBC Pro LIVE event at the iconic NYSE on Thursday, June 12. Join interactive Pro clinics led by our Pros Carter Worth, Dan Niles, and Dan Ives, with a special edition of Pro Talks with Tom Lee. You’ll also get the opportunity to network with CNBC experts, talent and other Pro subscribers during an exciting cocktail hour on the legendary trading floor. Tickets are limited! 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