Probably they are doing the same as what some other investor mentioned on another stock?
"If you take a quick look you will see the modus operandi of UBS traders, continually drip feeding single digit sales (presumably to try and push the price lower) interspersed by occasional larger buys of several thousand. Cheap accumulation probably by triggering stop losses of retail investors. Rinse and Repeat."
APO Price at posting:
$4.73 Sentiment: Buy Disclosure: Held