@Mark Bodinger, Berkshire bought Hendricks & Partners, which is a Multifamily brokerage. Don't expect to see them buying houses any time soon, or ever, within this merger.
@Jerry Kisasonak, you get in touch with these groups by finding the local real estate agents that are representing them. They have gone out to each market and identified a few agents to be their "buyers agents" and scout for property. For me, it was pretty easy to find them because they found me. It started by noticing who was writing offers for them on my flips, then it progressed to getting phone calls from them asking to buy anything and everything I have.
Call a couple of REO agents in your area and ask them who is writing offers on their listings. Chances are they will be well aware of who the players are. I wouldn't bother trying to call the hedge funds directly, unless you own a large portfolio of homes you want to sell, they won't want to talk to you...they'll direct you to talk to their agent if you can get them on the phone at all.
Everything that I buy that makes sense to hold as a rental, I hold. Everything that doesn't make sense to hold as a rental, I flip. What's funny is that about 30% of my flip inventory over the last few months has been bought by hedge funds. They don't make sense to hold at my wholesale price, so how they make any sense at all at my retail price is beyond comprehension. Essentially, these groups are going long on RE valuation, not seeking yield.
I wouldn't worry about spending a lot of time looking for them. In several months, institutional acquisition of single-family will be a distant memory, shelved in the dust next to the hula hoop and Rubicks Cube. It's a great strategy when done right, but I for one will likely be done acquiring in volume within 18 to 24 months. I suspect others will do the same.