SEC rules only involve shareholders if there's insider trading or a shareholder holds 10% or more of stock (this is to make sure the shareholder isn't manipulating things to their advantage).
To get back to the original point of our exchange, communication, the SEC does have rules based on financial reporting and whatnot depending on the class of stock the company is listed as. When I mentioned penny stock, I was referring to the pink classification of OTC stock, of which $ENZC is. This is the lowest level of stock with the least amount of reporting requirements.
Definition from Fool.com:
Here's the link that the above quote was taken from: OTC Market Levels
NOTE: The above doesn't describe what it takes to be Pink Current vs. not. This has to do with minimal annual reporting of financials to maintain current status. It has nothing to do with communicating with shareholders in any manner.
When people on the board post that they're waiting for $ENZC to uplist, this is why.
So to reiterate my original point: $ENZC does not owe the shareholders communication on ANYTHING.