From an inside source definition
From an inside source means through a director, employee or shareholder, or having the information by virtue of his employment, office or vocation (or having it from such an individual). This means that the information does not have to come from the Company (as was the case previously) but could come from a broker or credit-rating agency, or even a competitor. However, your observation, when passing a factory, that an extra shift is being worked would not be “from an insider source”.