Holding or selling a stock bought at $0.1520, especially with a potentially unusual ticker like "$SXT 100 $," demands careful thought based on your finances, risk appetite, and investment plan. If you meant Sensient Technologies (SXT), currently around $93-$95 with a "Buy" consensus but limited upside, your gains are substantial. Consider taking profit, especially if it was a volatile penny stock. Research the company's health and market conditions if it's another entity. Penny stocks are high-risk, prone to volatility, and may lack liquidity or information. Thorough research and professional advice are crucial before deciding.