What you are saying about marketable limit orders at the open is what usually happens. That is why I was so surprised at what actually happened on one of my orders. It was a sell limit marked GTC and RTH-only. The market opened and traded well above my price, but I got filled at my price which may also have been the low of the day. I guessing that the specialist cleared all his buy orders at the open, then filled me out of inventory. I called my broker and was told it was all allowed.Quote from Surdo:
My recollection is a REGULAR limit order entered preopening gets paired off in the market order cue if it "marketable" above/below the opening price.
I am fairly confident this is the case. A limit order that opens on YOUR limit might get a partial fill, you have to get filled if your limit is higher than the opening, otherwise they would have to open the stock higher. Think about it, it's logical!
Regarding the partial fill, I believe you are correct. The open equalled my limit price.
[rwk]