Several factors can contribute to pullback and some of these factors are:

1. Overvaluation: If a stock becomes significantly overvalued based on its fundamentals or market sentiment, investors may start selling their shares, causing a pullback in the stock price.

2. Negative News or Events: Adverse news related to a company, its industry, or the broader market can lead to a potential pullback. Examples include poor financial performance, regulatory issues, geopolitical tensions, or economic downturns.

3. Profit Taking: After a significant price increase, some investors may choose to sell their shares to lock in profits. This selling pressure can result in a pullback as demand decreases.

4. Technical Factors: Technical indicators, such as moving averages or trend lines, can signal potential pullbacks when stock prices deviate from established patterns. Traders who follow technical analysis may react to these signals and adjust their positions accordingly.

5. Market Volatility: Increased volatility, driven by factors like market uncertainty, changing economic conditions, or unexpected events, can lead to pullbacks as investors become more cautious and risk-averse.