It doesn't mean anything. I've noticed stockcharts.com has dropped a bunch of .0001 stocks lately. It's really annoying.
I messaged them about it and they said if enough people request a symbol it will get added back. It sounds like whoever they get their data from has a limit on the number of symbols they have access to. It's pretty lame. They should really upgrade their data feed so they can show every US stock.
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