An Upthrust bar is a wide range bar seen during an up-trend when price makes a new high and closes strongly down on high volume. This bar could be compared to Bearish Engulfing candlestick chart pattern.
Mechanics behind an Upthrust bar
At first the Bulls were strong and they were able to push price up, however, as institutional traders (Smart Money) started to sell, they generated strong Bearish pressure by pushing price strongly down. The Bears had to create strong Supply to overcome the Demand of the Bulls and push the price down. This is a Sign of Weakness, because the Bulls yielded to the strong increase in Bearish pressure.
What we have to see:
As was mentioned above this chart pattern is similar to Bearish Engulfing candlestick chart pattern.
What should we expect
After a strong volume surge we should expect a strong reversal. The stronger volume surge was witnessed during the last 2 bars of this pattern - the stronger pressure was applied by the Smart Money against the Bulls. The Smart Money distributed a lot of shares and they are ready to sell more. The close price is also an indication of the Bulls weakness. When an Upthrust bar's close price is close to this bar's Low price it would point to a very weak Bulls. When an Upthrust bar's close price is closer to this bar's middle (candle has lower shadow) it would signal that the Bulls are not very weak and we still may see a continuation of a fight between the Bulls and the Bears.
Below you may see the AMZN (Amazon) stock chart with Upthrust Bar which marked the top of the up-trend - the AMZN stock reversed into a down-trend after that.
After an we witnessed a sign of weakness (SOW), the next bar is important as a confirmation of a this weakness. To be more confident that the Bulls became weak and this is not just a temporary weakness, we may wait for the next bar, which may provide us with clues about further price trend development. See here some points on a confirmation of a weakness.
By V. K. for MarketVolume.com