I don't know if LVS has been implementing any of its authorized buyback, so I'm just guessing they might be via those end of day big block trades we've seen. I just know I would not want to be short hoping for a sell off...
I'm not so sure they made that big block trade. If they keep a floor under the stock daily and kill the short attacks the chart will repair itself and recover without any help from LVS buyback. The only thing that keeps this stock down are the relentless bear attacks when it's being pushed down. Kill that and it will go to the 70's easily.
We don't know for sure, but when companies do it, they typically like to execute them at the end of the day when trading volume is high and liquid... and that's also a time when the impact of the trades will disrupt normal trading that follows it the least, since there is no trading after 4.
They do it that way for the same reason they announce earnings after the close.
If the first one actually happened this close to quarter's end, look for systematic buys to occur throughout Q3 to demonstrate balance to the SEC.