I have an algorithm that filters out stocks if they are within a few days of 10-K filings using the EarningReports.FileDate from MorningStar. Now I would like to exclude the symbols based on additional SEC filings like 8-K, 6-K and 10-Q filings as well. Are the filing dates for these additional SEC filings available? I am guessing it isn't in MorningStar data. Is there any external data source that I can tap into? I am a good Python as well as Web API developer. I can tap into an external API if there is one. Please advice.