The Motley Fool, Nasdaq and Yahoo Finance all were able to deduce RenTech's purchases of cannabis stocks.
I can see RenTech's quarterly reports on EDGAR, but they don't list changes. How can I deduce the changes most productively, without manually and unproductively comparing each stock holding?
I'm uneducated in computer science and programming; I don't understand much of Is there an API to parse SEC filings on EDGAR?.