@Gregg_Stebben - Thanks for the inspiration.
I have built a table with a filter and a view that shows the largest entry in each sub-group.
It adds two columns, with the following formulas:
tabAllNotes.Filter([Stock Symbols]=thisRow.[Stock Symbols]).[Date & Time].Max()
If(thisRow.[Date & Time]=thisRow.[Latest note date],“Waar” ,“Vals”)
Then simply filter for “Waar” (True)
A more complete explanation and example doc is at the coda Education Community