If you buy "NE" you will own Noble Corp. and the person you bought it from will have to deliver PGN to you when it is issued either on 8/1 or 8/4.
Things may not be on your time line, but PGN will have to come sometime later.
Per Pismire's most recent post, I get the impression one can not only get NE on a purchase but also get PGN at some point in time. So it sounds like an investment in NE can only go up in the near time due to PGN stock that you get as a gift. Wonderful!! A lot of investors don't know about this!! All the more reason to invest in NE...in my opinion. But do your own research just to be very careful!!