At the moment it looks like Shorts, Hedge Funds, MM's are all working hard to keep SP from really jumping. Hate those 100 share lots showing up one after another while SP declines a penny or two per trade.
*There are aggregate fails to deliver at a registered clearing agency of 10,000 shares or more per security;
*The level of fails is equal to AT LEAST ONE HALF OF ONE PERCENT of the issuer’s total shares outstanding; and
*The security is included on a list published by a self-regulatory organization (SRO).
"Dis-alllow" your broker loaning your shares to short sellers (you agreed to if you have a standard margin account). You can prevent this by putting in a GTC (good till canceled) SELL ORDER OF YOUR OWN - at a price within 10 points higher. Risk control at the clearing firms won't allow your shares to be loaned out if they are "spoken for" by you.