I thought the H-1B was supposed to be a lottery, how is any company having this much "good fortune"?
Also the H1B process has always felt like who can create the most compelling application. Remember this is a specialization visa and you are basically demonstrating why (a) you cannot find such talent locally and (b) the value it will add to the US economy. So large companies with creative legal counsel do have an advantage over small shops.
You might be thinking of the L1 visa