Shortening of the Thrust

What is shortening of the thrust?

Shortening of the thrust (SOT) is the Wyckoff observation that each successive push to a new high or low gains less ground than the one before. The trend is still printing new extremes, but the distance each one adds beyond the previous extreme keeps shrinking, which reads as the force behind the move tiring.

The term comes from the Wyckoff tradition of reading price and volume together, and David Weis treats it in detail in Trades About to Happen (2013), his modern adaptation of the method. Volume decides the interpretation, following effort vs result: shortening on heavy volume is read as effort buying little progress because the other side is absorbing it, while shortening on light volume is read as the trend's own participants withdrawing.

SOT describes deceleration, not reversal. Trends can keep shortening for several more pushes, so practitioners wait for a change of character, such as a forceful move the other way on expanding volume, before treating it as a turn.

How to identify shortening of the thrust

SOT is a sequence, not a single bar:

1. 1Find at least three consecutive pushes to new extremes in the same direction.
2. 2Measure each push's gain beyond the prior extreme: new high minus previous high, or previous low minus new low.
3. 3Check that the gains shrink in order, with the latest push the smallest.
4. 4Compare the volume behind each push, then wait for a change of character before acting.

How traders use it

• Protecting positions: shrinking thrusts in a held trend are a cue to tighten stops or take partial profits rather than add.
• Inside Wyckoff ranges: shortening declines into support, or shortening rallies into resistance, set the context for the tests at those edges, such as a spring or an upthrust.
• Measured by wave: Wyckoff wave and volume studies make the volume side explicit by totaling the volume behind each push.

Shortening of the thrust vs related reads