Anything more than 10 is too many if your goal is to know everything about the business you are invested in. I have a hard enough time keeping up with the 8 I have. Diversity shouldn't be used as an excuse for not doing homework. It's impossible for anyone to read and understand a 175 page 10-k report on 60 different occasions, much less all the other filings one should be reading on a daily basis regarding each business.
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