The MOC order is how big money guarantees a fill at the official closing print, and the imbalances it creates can move the last minutes of the day.
NoVo Options Trading ·
A market-on-close (MOC) order executes at the official closing price, guaranteeing participation in the closing auction. It’s a tool used mostly by institutions to get the closing print.
How it works
An MOC is an unpriced order to buy or sell at the close. It must be entered before a cutoff (around 3:50pm ET on the NYSE) and is guaranteed to execute in the closing auction at the closing price. Funds, index trackers, and rebalancers use MOCs to trade at the official close rather than risk moving price with earlier orders.
Why it matters to a trader
The aggregate of MOC orders creates a closing imbalance — more buy or sell MOCs — which exchanges publish into the close. A large imbalance can push the last minutes of the day in that direction (a big buy imbalance can lift the close). It’s part of why the close can move sharply, on top of charm/gamma flows.
MOC orders are how institutions lock in the official close, and their imbalance is a real force on the final minutes of the tape.
The takeaway
You likely won’t use MOCs as a scalper, but knowing they exist explains end-of-day imbalance moves. The published MOC imbalance is a genuine late-day tell. Its priced cousin is the limit-on-close (LOC) order.
NoVo reads the full tape and maps every dealer level live — the market intelligence no human can track by hand — then draws it on your chart as it moves, and tells you what it has seen this setup do before.
Trader · $209/mo
The cockpit.
Every dealer level living on a real charting terminal — 1-minute to weekly, fifteen years deep, your own drawings on the map, SPY/QQQ/IWM one click apart — with the hourly audit, ‘The Line’ playbooks, the three books side by side and NoVo’s written read where you trade. Analyst included.
The same dealer map drawn on crypto — gamma by strike on every book with real open interest, funding per venue, open interest, 24-hour liquidation flow and true cost to trade — plus the on-chain liquidity map across Solana, Base and Robinhood Chain. NoVo reads it too.
The live dealer map — dealer positioning, options flow, and in-house sweeps & block prints — plus a written market read every session, to your inbox, the dashboard, and the private Analyst Discord. Structure, levels, and the order-flow footprint.
NoVo is a software tool for market analysis, not financial advice. This article is general education, not investment advice. Options trading involves substantial risk of loss, up to and including your entire capital. NoVo makes no guarantee of profit, win rate, or performance, and past results do not predict future outcomes. You are responsible for your own broker account, configuration, and trading decisions.
The member portal — delayed dealer levels with the gamma flip and the expected-move band on SPY, QQQ and IWM, plus sectors, movers and the week’s catalysts. NoVo’s Mid-Day Tape Review every trading day and the Week Ahead on Sundays. And the NoVo Discord: live discussion and NoVo’s daily dealer-map read.