Golden Gate Capital acquires a 3.97% stake Morningstar is reporting that Golden Gate Capital has initiated a new postion of 1,246,400 shares of ATB as of March 31st. I'm not sure where they got this information from but it is probably safe to say that if that's what they accumulated in the first quarter, they have probably continued accumulating since and that has benn partially responsible for the increase in the share price.
The interesting thing is that they are a PE firm that are not really stock investors but buyers of companies. They have a hitstory of acquiring nutritional companies although I wouldn't place a high probability of ATB agreeing to be bought out by a financial company.
These guys don't really appear to be the hostile or activist type but at the share price they started accumulating at, they could certainly drive the price much higher in the hopes of becoming a major stakeholder to eventually buy the company outright or sell it to a strategic buyer.
If nothing else, this is just a sign that the stock is starting to garner a little more attention:
https://quote.morningstar.ca/Quicktakes/owners/MajorShareholders.aspx?t=ATB®ion=CAN&culture=en-CA