Plenty of stock market sites are powered by WP. Their webmasters can use plenty of themes and plugins to add more features to their website. Inline Stock Quotes for WordPress is a handy plugin that lets you add dynamically updating quotes into your posts.
Inline Stock Quotes shows positive changes in green. When a certain stock goes negative, it is displayed in red. The shortcode is pretty easy to use. Simply add the symbol to the “stock” shortcode, and you are set. The settings page lets you change font, color, and other settings.
You can try this plugin for free at this time. More info is available here.