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I’m waiting for them to get rid of the send-to-kindle email thing to receive books from calibre. I’m surprised it has survived for this long. I’ve wanted to try out a kobo but can’t justify it cause my 10+ year old kindle still works perfectly fine for reading. But once they remove that feature or drop support for my device, it’s kobo time.
I think this probably still won’t do what you want, but actual-helpers has a script that will track the balance of an investment account. It won’t track shares or funds separately or anything, but it could maybe be enough if your goal is just net worth tracking?