2004issue C031
Opening auction envelopes and crutch pairs
This archive article restates a listed-market workflow that posts envelope and opening orders only while the fill still sits with the specialist as liquidity accommodator. When that alignment fails, the order is pulled or the risk is moved through a same-sector crutch pair.
- Envelope orders around the live bid and offer are meant to fill when a block trade-through prints through standing quotes, and those standing orders are described as entitled to the improved print.
- A stated opening-play edge is specialist-alignment, but a large gap-up can put opening buys above the prior close and remove that alignment if the specialist is then shorting on an uptick.
- After an opening indication, the sell is tightened into the top third of the indicated range and the buy is left far below it; with no indication, a buy fill is read as stock available for sale and still specialist-aligned.
- A same-sector crutch-pair offsets a lagging name that fails to participate against the stronger related bid, instead of completing a second pair trade.
The archive workflow
The archive describes envelope orders around the live bid and offer, opening placement after indications, and a same-sector pair used as a crutch. The envelope procedure is applied mainly to large-capitalization listed names.
Envelope orders and trade-throughs
Envelope orders sit around the live bid and offer. They are meant to be filled when a block trade-through prints through standing quotes. Those standing orders are described as entitled to the improved print.
Orders are left posted through the session and are moved away from the last sale as price approaches, waiting for a gap.
Automation is optional. Trainees are taught to work the envelope procedure by hand first. Other market indicators still enter the stay-or-pull decision.
Opening indications and specialist alignment
A stated opening-play edge is specialist-alignment: being filled on the same side as the specialist when the book is being accommodated. A large gap-up can put opening buys above the prior close and remove that alignment, because the specialist may then be shorting on an uptick.
After opening indications appear, the sell is tightened into the top third of the indicated range while the buy is left far below that range. With no indication, a buy fill is read as stock being available for sale and therefore still specialist-aligned.
The crutch pair and listed auction mechanics
A same-sector long and short pair can serve as a crutch. The lagging name is entered on an upward move. If it fails to participate, the position is offset against the stronger related bid instead of completing a second pair trade.
A planned listing of Nasdaq names on a listed venue was described as adding guaranteed opening and on-close fills plus published indications and imbalances. The opening-only method needs those features because it depends on listed-opening-auction mechanics.
All readings on this track · 7 readings
- 2001Displayed size, venue rules, and execution costs
- 2004Opening auction envelopes and crutch pairs
- 2005Electronic index futures: spread quotes that follow the tape
- 2007Pairs, hedges, vanishing bids, and the cost of liquidity
- 2012A transaction levy makes one-tick market making unexecutable
- 2012Visible opening depth versus internalized subpenny priority
- 2012Broken quotes as liquidity events