The process continues towards the start of the Collingwood judicial inquiry into the sale of half of the town's electric utility in 2012.
The inquiry team says it has now sent out summonses to those who are likely to be called as witnesses during part one of the inquiry which will focus on the sale of Collus shares.
This part of the inquiry hearings starts on April 15.
The team adds that not all witnesses who receive a summons will be required to testify.
In some cases, a witness's evidence may be received in writing or as the inquiry moves along, that witness may no longer be needed to give evidence.