Okta's stock was upgraded to 'buy' by D.A. Davidson following a strong earnings report that exceeded expectations, resulting in significant stock price increases.

The article reports on companies making significant stock market moves, highlighting performances of firms such as Nvidia, Rolls-Royce, and Teladoc Health amidst varying quarters.

Snowflake's shares surged over 13% after reporting a strong earnings beat for the fourth quarter, with significant revenue growth and an expansion in AI offerings through a partnership with Microsoft Azure.

AppLovin's shares fell 16% amidst allegations from short sellers doubting the integrity of its AXON ad software, which is accused of violating data privacy laws.

The article discusses significant stock movements in premarket trading, including notable rises and falls among companies such as Super Micro Computer, General Motors, and Instacart, driven by earnings reports and corporate announcements.