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.