I have found that Tues - Thurs of tax loss sell off week is usually the best time to buy for many securities. Between 1.01 - 1.08 could easily have been had . Those that bought gained 35+% in less than 48 hours! $GLUC
Today I made about 4 purchases some below and some above closing price. I bought 1800 shares when it was 1.70 all or none when the ask was 1.68. Only had to wait for about 10 minutes.
Small share purchases seem to be easier to get at ask but I don't have the patience. I put some purchases at a $2 limit when ask was 1.88 and all partials were transacted below
Another was limit of 1.65 and got 4 partial fills at 1.60 (the ask) then the rest at 1.68. Partials filled 100 to 400 increments