That's interesting you metioned this because all stocks are like that once in a while. Some big firms have computers that look for this. Different ECNs will have slightly different bid/ask. So the firms will program the computer to look for them, then buy and sell. usually it may only be 1/2 of a cent but still... It is usually for a small amount of time. So if one ECN has a ask of $1.15 and another it's a bid of $1.155, then the computer can buy on one, then sell on the other. You can route your orders to the one you want with most platforms. With that list I do not see this is the case buy still interesting someone would post this. But yeah, that's how stocks work sometimes. It's not a conspiracy or anything.