Absorption is when a large amount of aggressive selling (or buying) hits the tape but price barely moves — because a big passive player is soaking up all of it with resting orders. Heavy sell volume with no downside progress means someone is quietly buying everything the sellers throw — and that someone usually wins.
Why absorption signals a reversal
Normally, heavy selling pushes price down. When it doesn't, the selling is being absorbed by a larger buyer defending a level. Once the aggressive sellers exhaust themselves against that wall of bids — and they have limited ammunition — there's nothing left to push price down, and it snaps back up as the buyer's size takes over. Absorption at support is a classic bottoming tell; the mirror (buying absorbed at resistance) tops moves.
How to spot and use it
The signature: high volume, negative delta, but price flat or ticking up — sellers hitting bids and getting nowhere. It's most meaningful at a level: absorption at the put wall or a support shelf is dealer/institutional buying defending it — a high-conviction long once the sellers give up. It often accompanies a stop-run reversal, where the sweep's selling gets absorbed and reverses.
Heavy selling, no drop, means a bigger buyer is eating it. When the sellers run out of ammo, price goes the buyer's way.
The frame
Absorption needs order-flow tools to see clearly and is a confirmation read, not a standalone trigger — it tells you a level is being defended, and price confirms the reversal. Best used at a mapped level in a supportive regime; in a strong negative-gamma trend, apparent “absorption” can give way to a break. Read it as evidence a level will hold, then trade the level.