Underlying Asset Performance: BSMC's price heavily relies on the performance of the underlying small-cap stocks it holds. If these stocks rise, BSMC's price typically increases, and vice-versa.

Market Sentiment: General investor confidence and risk appetite affect demand for small-cap stocks. Positive sentiment boosts demand, increasing BSMC's price.

Interest Rates: Rising interest rates can negatively affect small-cap companies due to increased borrowing costs, potentially lowering BSMC's price.

Economic Growth: A strong economy often benefits small-cap companies, leading to higher earnings and stock prices, thus increasing BSMC's value.

Sector-Specific Trends: Specific industries heavily represented in BSMC can impact its performance. For example, technological advancements affecting a core sector.

Supply and Demand: Like any security, the balance of buyers and sellers impacts BSMC's price. High demand relative to supply will drive prices up.

Expense Ratio: Although less direct, BSMC's expense ratio affects investor returns, which indirectly influence demand and potentially the ETF's price over time.