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at least at tdai

for any stock with, say, a 10c spread
I get better fill prices by putting in under 99 share buy and sell orders in a block account

I don't have level 2
so if a particular stock shows a 1100 bid and 700 ask
I put in 700 worth of shares but in under 99 lots all executed at once
and almost always get better fills
as much as 5-8c for that example

if i put in one order for 700 shares, i get the higher price period most of the time on the buy
i first noticed this w/the CEF preferreds
almost 100% of the time I got better fill prices when using under 100 share lots
but also notice it on many of my small caps too

had an example yesterday
I put in 1000 sell shares and got 28.66
when I broke a similar size order into 99 shares or less for the same 1000 shares, I got 28.68...

I've also noticed this with the ETF BIL I'm using
most full lots get filled at 1c higher, but under 99 lots done together regardless of size usually get 1/2 cent lower, which is a big deal in this security
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