Where were All the Primarchs during the Seige of Terra (Warhammer 40K)

With the end and the death books finally out, we now know what all the primarchs were doing during the siege of terra, the endgame battle of the Horus Heresy. There are tons of new information and s oft retcons that have happened, but we will brush that aside for now and discuss just one thing here, What were all the Primarchs doing or where were they during the final climactic battle of the greatest civil war mankind has ever seen. So let’s get first to the dead ones, then the missing ones and then lastly the ones that were active in the siege.
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