Real,
IMO, the high speed trading most likely has not been used on SLI, because of the volume needed to make it worth while. These trading systems (ATS- AUTO TRADING SYSTEM) are usually set up on high volume stocks where .01 gains on large blocks of shares traded brings in nice daily revenues. For that reason, I dont think they have been used on us specifically .
However, Credit Suisse has used one on the buy side a few times on us, buying 100 shares at a time.
It is possible that they could have been used on us for just a negative sp effect a few times, but it was not set up to trade, it was used for purposely holding the stock in one position and preventing it from rising.
You can never be sure when these systems are used, but sometimes it is pretty clear when they are.