Underlying Index Performance: The primary driver is the performance of the underlying index tracked by the ETF. A rise in the index typically increases the ETF's price, and vice-versa.

Supply and Demand: Market forces influence ETF prices. High demand can push the price above its Net Asset Value (NAV), while increased selling pressure can drive it below.

Net Asset Value (NAV): The NAV represents the per-share value of the ETF's holdings. Discrepancies between the ETF's market price and its NAV can create arbitrage opportunities.

Investor Sentiment: Overall market sentiment toward the sector or asset class represented by the ETF plays a significant role. Positive sentiment tends to drive prices up, while negative sentiment can lead to declines.

Liquidity: Higher trading volume generally leads to tighter bid-ask spreads and price efficiency. Lower liquidity can result in wider spreads and greater price volatility.

Management Fees and Expenses: While these don't directly affect the daily price fluctuations, higher fees can indirectly impact long-term returns and potentially affect investor demand.

Market Maker Activity: Market makers play a crucial role in providing liquidity and ensuring efficient price discovery. Their activity can influence short-term price movements.

Global Economic Conditions: Broader economic factors, such as interest rates, inflation, and economic growth, can influence investor sentiment and impact the overall market, thus affecting ETF prices.