Which dealers make up the Grey Sheet?

I use it often when buying my series. I beleive they have a group of dealers who bid and asks and that is how they come up with prices.
Any dealers in this forum that are part of it?
Does anyone know which dealers contribute to it?
Or, is there other resources they are using to get bid and asks? Any inside ing. would be appreciated, Thanks.
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Authorized dealer for PCGS, PCGS Currency, NGC, NCS, PMG, CAC. Member of the PNG, ANA. Member dealer of CoinPlex and CCE/FACTS as "CH5"
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<< <i>What's bid on an 1804 $10 in PR64?
I know where you can get one in an NGC holder
<< <i>Does anyone know which dealers contribute to it? >>
I know a couple.
[I had the last laugh - just sold it for a $70k profit]