Something that seems worth mentioning here is the capital gains tax issue.
For instance, if you bought ABC shares on 1-Jan-2020, you'd receive CGT discount if sold from 1-Jan-2021
If you also bought ABCO on 1-Jan-2020, exercised them on 1-Aug-2020, then your CGT discount will kick in from 1-Aug-2021.
https://www.ato.gov.au/Forms/Guide-to-capital-gains-tax-2020/?page=43
That is how I understand it.
