I noticed that you can create split investment transactions, but the "Investment Transactions" report doesn't seem to have an option to show them.
You can easily create split investment transactions:
But when you try to create an investment report showing the splits, you don't seem to have that option available.
Here is a split investment transaction I created:
This is how it's shown on transaction reports:
The main memo is repeated three times, But the split categories are shown as "—Split—" and the split memos are not shown.
I am not sure how many users use split investment transactions, but it is strange the the capability to create them exists, but there is no option show them in reports.