SPX and SPY are two very similar instruments from which a trader can choose. Today we will talk a bit about the similarities and differences between the two. What is SPX? SPX is the nickname for the Standard and Poor's 500 Index. It is based on the 500 largest companies whose stock trades on the NYSE or NASDAQ. A list of the 500 … [Read more...] about What’s the difference between SPX and SPY Options?