Basically, the up-to-date outstanding shares. I go one step further sometimes, and ask for what it was, going back. I've done this even as far back as a year, though the first day of the last 3 months is usually sufficient.
I've had a few TAs who can be arses, not wanting to give the data out. Supposedly, they say they can't reveal the o/s because it also allows shorts to know about dilution. Though this is true, it is a catch 22, so to speak.
I, personally, lose interest in a stock I have no idea about the o/s, and I tell them so, and that they are turning away a potential investor by not revealing what is suppose to be publicly accessible information. They usually give in, but not always.
Again, a gagged TA, which is done so by the company, purports ongoing dilution, and is a major red flag. My theory is, if they are not diluting, it does not matter whether shorts or Longs know about it. If shorts see that they are not diluting, they may lose interest. If Longs see that they are not diluting, they become MORE interested.
Gagged TA...stay away. Plain and simple.
to make a million bucks over night" 
