Between 1998 and 1999, Ameritrade helped grow and improve the online trading experience for self-directed investors. The company started offering online options order entry and electronic trade confirmations via email. These innovations, along with extended-hours trading, the Ameritrade Online Investor Index™ (one of the first online investor behavior measuring tools), and trading via the SprintPCSSM Wireless Web, the first of its kind via mobile device, helped keep Ameritrade at the forefront of a booming industry.