UK100 Momentum Fades as Structure Starts to Break DownUK 100CAPITALCOM:UK100CapitalcomThe FTSE 100 had looked well positioned to retest its all-time highs, but recent price action has seen the early April relief rally not just lose momentum, but begin to break down. The focus now turns to whether this is simply a pullback, or the early stages of a broader change in trend. Failed Bull Flag Breakout Changes the Tone The shift in tone can be traced back to the failed breakout from a small bull flag pattern. Into the close on Friday 17th April, the FTSE had broken and closed above the structure, with the move appearing to confirm continuation within the broader uptrend. Heading into the weekend, the setup looked constructive. However, that view was quickly challenged. When markets reopened on Monday, price had already slipped back inside the flag, and crucially, there was no attempt to reclaim the breakout level. Without follow-through, the move higher effectively failed. That type of price action matters. Failed breakouts tend to trap late buyers, particularly those entering on the initial move higher. As price rotates back into the prior range, those positions come under pressure, and that shift in positioning often drives the next move. This is what followed, with the index breaking back below the flag, then the ascending trendline, and more recently the 50-day moving average. UK100 Daily Candle Chart Past performance is not a reliable indicator of future results The move lower has not been aggressive, but it doesn’t need to be. The loss of structure, rather than the speed of the move, is what changes the outlook, and it should be enough to have bulls considering the strength of the prior trend. Intraday Structure Weakens as Lower Highs Develop Zooming into the 4-hour timeframe, the change in behaviour becomes clearer. Since the failed breakout, price has started to carve out a series of lower swing highs, while attempts to stabilise have struggled to generate meaningful upside follow-through. That is often an early sign that momentum is shifting. More recently, price has begun to compress. Friday’s session was fully contained within Thursday’s range, creating an inside day pattern. That range, highlighted on the chart, now provides a clear short-term framework for traders, with Thursday’s high and low acting as near-term reference points. UK100 4-Hour Candle Chart Past performance is not a reliable indicator of future results A break and close below Thursday's low on the four-hour timeframe, when viewed in the context of the broader shift in structure, would reinforce the bearish case and bring the next support levels into focus. On the other hand, a decisive break above Thursday’s high would suggest the market is beginning to whipsaw, signalling a loss of directional clarity and a potential shift into more range-bound conditions. What Matters Now Taken together, the failed breakout on the daily timeframe and the developing lower high structure on the 4-hour chart point to a market that is no longer trending cleanly higher. Instead, we are seeing the early signs of a momentum shift, where rallies are starting to fade rather than extend. For traders, the key now is not what the market has done, but how it behaves next. The structure is beginning to soften, but confirmation still matters. If sellers can build on this sequence of lower highs and push through nearby support, it would strengthen the case for a deeper pullback. Equally, if price begins to reclaim lost ground — particularly the 50-day moving average — the current weakness may prove to be a period of consolidation within a longer-term uptrend rather than the start of a reversal. Disclaimer: This is for information and learning purposes only. The information provided does not constitute investment advice nor take into account the individual financial circumstances or objectives of any investor. Any information that may be provided relating to past performance is not a reliable indicator of future results or performance. Social media channels are not relevant for UK residents. Spread bets and CFDs are complex instruments and come with a high risk of losing money rapidly due to leverage. 81.31% of retail investor accounts lose money when trading spread bets and CFDs with this provider. You should consider whether you understand how spread bets and CFDs work and whether you can afford to take the high risk of losing your money.