Private Placement share are shares which the Company alloted to certain investors only at a discount price. It is another way to raise $$$. However, it will dilute the market shares.
For IPO placement share, some brokerage firms are alloted with some share which sometimes your Brokers (if you on term with) may also allot you some IPO placement shares, no balloting required.
Life's like a box of chocs, you'll never know what you gonna get. I didnt know, but when you walked into my life, i just knew i'd gotten the sweetest box...