1. By Company Size (Market Capitalization) - Large-cap: Companies worth over $10 billion (e.g. Apple, Microsoft).Stable and reliable, often pay dividends. - Mid-cap: $2–10 billion (e.g. Crocs, Roku).Growing companies with moderate risk and reward. - Small-cap: $300 million–$2 billion (e.g. niche or newer firms).Higher growth potential but more volatile.