How much inform­a­tion should com­pan­ies be expec­ted to make pub­lic on issues like — say — their CEO’s health? Indi­vidual exchanges have their own rules about disclosure.

For example, the NASDAQ says its com­pan­ies: “shall make prompt dis­clos­ure to the pub­lic through any Reg­u­la­tion FD com­pli­ant method (or com­bin­a­tion of meth­ods) of dis­clos­ure of any mater­ial inform­a­tion that would reas­on­ably be expec­ted to affect the value of its secur­it­ies or influ­ence investors’ decisions.” Con­tinue read­ing →