Well, in fairness, Buffett says this about companies trading on the NASDAQ, not the Pink Sheets.
I am sure he'd recommend NOT buying and holding Pink Sheet stocks since the vast majority eventually fold. I would guess he'd say never even buy into them.
That's OK, Buffett doesn't manage my money. I do. I like POTN and think it has significant promise. While most Pinkies don't survive... some do. And, I think POTN is showing the signs of one of those survivors and will be successful, eventually seeing the NASDAQ.
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