The Failed Gap Fill
Two price movements that look identical on a small chart often diverge significantly as the session progresses, as the notes at orb trading case studies edhamiltonworks describe. A failed gap fill occurs when the intraday price action breaks the opening range and then refuses to return to the previous day's close. This specific pattern indicates that the overnight session sentiment has shifted into a directional trend that cannot be reversed by the initial morning volatility. Traders often mistake a minor pullback for a return to value, but the lack of a retest of the prior close signals a mismatch in supply and demand.
The Mechanics of the Breakout
The process begins at the market open. Once the first fifteen minutes pass, the high and low of that period establish a boundary. An opening range breakout occurs when the price moves beyond these levels with momentum. In a failed gap fill scenario, the price moves away from the gap area and fails to find support at the previous close. Instead of filling the void left by the premarket movement, the price continues to push toward a new session high. This movement suggests that the gap was not a temporary imbalance but a permanent shift in the price equilibrium.
Analyzing the Timeframe
The choice of timeframe determines the clarity of the setup. A 5 minute chart provides the immediate signal of the break, but a 15 minute range offers more stability for confirming the trend. When the price moves through the opening range and stays above the opening bell volatility, the failed gap fill is confirmed. Using a 30 minute range helps filter out the noise that occurs during the first hour of regular trading hours. If the price cannot return to the gap zone within the first hour, the probability of a trend day increases significantly.
Identifying the Failure Point
A failed gap fill is defined by the refusal to return to the previous day's close. In a standard gap and go, the price may dip slightly toward the gap before continuing. However, in this specific pattern, the price maintains its distance from the prior close. This rejection of the old price level is the mechanical signal. The absence of any attempt to fill the gap during the morning session serves as the primary evidence of strength. The momentum established during the opening range prevents the price from retreating to the level where the gap began.
Execution and Context
The setup requires observing the relationship between the opening range and the overnight session levels. If the price breaks the opening range breakout level and ignores the previous close, the trend is locked. The failure to fill the gap is not an error in price action but a confirmation of directional conviction. Observing how the price reacts to the sixty minute range provides further confirmation of the trend strength. The data shows that once the gap remains unfilled through the mid morning, the likelihood of a reversal diminishes.