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Politics : Formerly About Applied Materials
AMAT 261.81+0.4%Dec 26 3:59 PM EST

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To: Robert O who wrote (57829)12/19/2001 8:09:17 PM
From: mitch-c  Read Replies (3) of 70976
 
OT - All or None Orders

A few months back, I had the same question of my broker, though without the impact you've seen. The rep on the phone explained that orders fill (are paired) in this sequence when a tick is hit: first Market orders, then Limit orders, and finally All or None orders.

The first two can be automatically executed; the last requires manual intervention. If there is a lot imbalance, and a tick goes lower, your order goes to the back of the pile AGAIN, as the lower market/limit orders are executed. (Remember - you said All or NONE, so NONE is a valid handling ...)

Apparently, only when a) yours is the only remaining order on your side of the transaction (buy/sell) at that tick, AND b) when there are sufficient shares offered on the other side, does your All/None order actually execute.

Given the shift in execution priority inherent in an A/N order, I've decided not to use them.

Note that this is a second-hand description from a possibly ill-informed amateur ... please verify or debunk this for yourself.

Comments and corrections welcomed from anyone.

- Mitch
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