You can check out above graph to see how the market cap of NEO has changed over time. The market cap value depends on the value of NEO on that particular day and number of NEO in supply at that day.

How is NEO Market Cap calculated?

The NEO Market cap is calculated using a simple formula. You can find it below:

NEO Market Capitalization in USD = Number of NEO in supply X Price of one NEO in USD

Since the price of NEO is highly volatile you can see the market cap going up and down a lot. Sometimes price and market cap are not linear to each other due to increase in the supply of coins in the market and stable or decrease in the price of the coin. So you can say that it's not simple to predict the market cap of NEO or predict the price of NEO.