2012issue C0323
Listed auction imbalance and market-on-close execution
The listed open and close can be read as matching execution windows. Overnight interest is netted into a share imbalance, orders are placed away from the expected print, and the published close leftover is used as a participation and abstention filter.
- Overnight buy and sell interest is netted into a share imbalance that shows leftover demand to buy or to sell, and the specialist is described as required to absorb that leftover.
- An opening auction strategy places bids and offers away from the expected print, using futures direction, overnight electronic prints, and the posted imbalance as location cues.
- A market-at-close order has no limit. Leftover quantity is published as a close imbalance 15 minutes before the regular session ends, and that last print can differ from the official 4:00 pm close.
- A closing auction strategy reads that leftover, can use a large-cap basket as a close-sentiment barometer, and treats a single-name buy imbalance after a sharp advance as insufficient evidence of further upside.
Matching windows, not forecasts
In editorial terms, the listed open and the listed close are two matching execution windows, not forecasts of later direction. The archive workflow first locates an expected print, then posts away-from-the-print interest, and later reads the published close leftover as a participation and abstention filter.
TradersWeek treats the two auctions as one testable sequence. The archive describes the historical workflow. The matching-window reading is editorial and is not attributed to the archive.
How leftover demand is posted at the open
Overnight buy and sell interest sent to the listed opening auction is netted by the exchange specialist. The specialist then posts a share imbalance, which is the leftover buy or sell quantity after an exchange official nets auction-bound interest, showing whether leftover demand is to buy or to sell.
The specialist is described as required to help absorb that leftover. Specialist accommodation is the exchange official’s role of absorbing leftover auction demand by selling into excess buys and buying into excess sells. The specialist sells when opening demand exceeds supply and buys when supply exceeds demand.
Orders placed away from the expected print
An opening auction strategy is a testable opening procedure that places bids and offers away from the expected print, using futures direction, overnight electronic location, and exchange imbalance as inputs.
The described opening procedure places bids and offers away from the expected print, using index-futures direction as the location cue. If futures are higher by half of 1%, stock may be offered about three-quarters of 1% higher, with the same offset used on the downside.
Overnight electronic prints are used as an extra location cue. Opening orders are typically set a few cents above or below the anticipated print in order to isolate an opening anomaly.
Market-at-close leftovers before the close
A market-at-close order is an unmatched market order designated for the closing auction, with no limit price, that seeks the last regular-session print. Market-on-close orders collected through the session are market orders with no limit. The specialist nets them and publishes leftover buy or sell quantity as a close imbalance.
That close imbalance is published 15 minutes before the end of the regular session. The last print received by a market-on-close order can differ from the official 4:00 pm close.
The imbalance figures are available on broker platforms and news services. Some vendors charge for the feed and some do not.
Participation, abstention, and an extended tape
A closing auction strategy is a testable close procedure that reads published market-on-close leftovers and decides whether to participate, stand aside, or fade an already-extended tape. In editorial terms, the published leftover is a participation and abstention filter, not a forecast.
A listed large-cap basket can be used as a close-sentiment barometer by counting how many names show buy imbalances versus sell imbalances.
A buy imbalance in a single name after the broader market has already advanced sharply is treated as insufficient evidence of further upside into the close.
All readings on this track · 10 readings
- 2003Listed auction accommodation and open-book execution
- 2004Reading auction signals to choose an open, a close, or a VWAP path
- 2006A leftover clock that licenses offset-only market-at-close
- 2007Carry-adjusted index premium for auction execution
- 2008Two clocks on a public small-cap membership reset
- 2008Opening gap limits and close imbalance orders
- 2010Closing auction snapshots, fair value and pivot levels
- 2012Listed auction imbalance and market-on-close execution
- 2013Taking liquidity to offset HFT queue priority
- 2014Sizing opening and closing auction orders to volume