Market Conditions: Overall stock market performance influences FPFZX.US, a Fidelity ZERO Total Market Index Fund, reflecting broad market trends.

Economic Factors: Economic indicators like GDP growth, inflation, and interest rates affect investor sentiment and market valuations, impacting fund prices.

Fund Holdings: The underlying securities within the fund's portfolio drive its price; the performance of these individual stocks directly affects the fund's value.

Investor Demand: Increased buying pressure pushes the fund's price up, while selling pressure can lead to price decreases. Supply and demand dynamics are crucial.

Expense Ratio: Though a ZERO fund, operational costs impact net asset value. While negligible, changes in operational efficiency could theoretically affect returns.

Index Tracking: How closely the fund replicates its target index (S&P 500) influences its price; tracking errors can cause slight deviations.

Global Events: Major global events, geopolitical tensions, and international economic changes can impact stock markets worldwide, affecting the fund's value.