Underlying Index Performance: JULP.US's price is heavily influenced by the performance of its underlying index, the Morningstar US Large Cap Index. Positive index returns usually lead to higher ETF prices, and vice versa.

Supply and Demand: Market demand for JULP.US shares impacts its price. High demand relative to supply can push the price above its net asset value (NAV), while increased supply can lead to discounts.

Interest Rates: Changes in interest rates, particularly those set by the Federal Reserve, can affect the valuations of the underlying stocks in the Morningstar US Large Cap Index, thus impacting JULP.US's price.

Economic Data: Key economic indicators like GDP growth, inflation rates, and employment figures can influence investor sentiment and affect stock valuations, subsequently influencing JULP.US's price.

Investor Sentiment: Overall market sentiment, whether bullish or bearish, plays a significant role. Positive sentiment usually encourages more investment into large-cap stocks, thus driving up demand for JULP.US.

ETF Flows: Significant inflows into JULP.US can drive up its price as the fund manager purchases more of the underlying assets. Conversely, large outflows can lead to price decreases as the manager sells assets.

News Events: Major news events, such as corporate earnings reports, geopolitical events, and regulatory changes, can affect the market's perception of the companies within the Morningstar US Large Cap Index, and consequently impact JULP.US.