MOC — Market-On-Close Imbalance#

In the Antigravity cosmology: the MOC Anomaly / the MOC Hammer — a gravitational strike in the final minutes of the cycle. In classical language: the order imbalance into the close — the surplus of demand or supply the exchange must pair off by 4:00 PM New York time.

What MOC really is#

A vast share of market capital — index funds, ETFs — settles by definition at the closing price. Their orders flow into a special closing auction, and starting at 3:50 PM ET the exchange publishes the Net Order Imbalance Indicator (NOII): how much volume remains un-paired between buyers and sellers. It is one of the cleanest public windows into explicitly declared closing-auction interest (the Nasdaq Closing Cross) — the flow in the auction book is registered, not guessed.

That is why the MOC window is often the most gravitationally dense moment of the session: tens or hundreds of millions of shares hunt for the other side within minutes. The closing price that results becomes the reference point for the entire next day.

How we measure it on the bridge#

Heniu reads the net imbalance in the MOC window and treats it with thresholds hard-coded in the system’s configuration: a surplus around ±50M is a strong signal of directional closing pressure, and ±150M is a singularity-class event (the “MOC Hammer”). The reading informs the description of the system’s vector from ~3:50 PM exchange time into the night — documenting closing order interest.

What MOC does not do#

It does not prophesy tomorrow’s session — it measures today’s settlement pressure. Sometimes a giant MOC Hammer is absorbed without a trace; sometimes a small imbalance ends in a large move. On this blog, MOC is a description of the force present in the auction — nothing more.

An Atlas card. Zero signals — only the physics of the System.