If you are interested in following SEC filings of companies, I wrote a RSS-bridge against Edgar which takes in tickers and sends a notification every time that companny files something to the SEC.

Code: https://github.com/RSS-Bridge/rss-bridge/pull/1011

If you have a list of tickers, you can generate a OPML feed from here: https://opml.bb8.fun/ (against my rss-bridge server, no uptime guarantees)