What is seen on the computer screens may not accurately reflect where the stock is trading. There was so much stock ahead of you, the market moved while your order was being processed. Maybe orders for 3 million shares were ahead of you. By the time you get executed, the stock could already be heading back down. What happens next is usually a shame.
Research shows that most IPOs end their first year lower.
Many file for bankruptcy or go out of business in short order. This is not a comprehensive list of all IPOs. It is a good example of some recent IPOs that took off, only to fall back to earth. This is not a comment on the companies. They may be great companies, profitable and nice to children.