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Do you need a database that works differently from EDGAR? Because I’m pretty sure that’s where everyone gets them.
You could also look up people who’ve done that sort of research in say SSRN.
Just from memory, some paper I read a couple of years ago did something like that, they found that mutual fund managers’ “best ideas”, as extracted from such filings using some pretty simple automated rule, not only had some significant alpha, but more than the full funds they were extracted from even before fees, which they blamed on the managers diluting their best ideas with a pseudo index tail to avoid tracking error from the benchmark, diluting their alpha in the process. This paper has probably been followed up since.
Now we just need an ETF for that strategy.