You can use Smartkarma Private Messaging to send direct, private messages to Insight Providers, Investors, and other Corporates like yourself. The option is available on the top right-hand side of your screen.
You can either a new message by clicking Send Private Message or view your inbox by clicking on View All Messages.
Search for the Recipients and send them a message.
You can also send a message to an Insight Provider through their profile page or through their Insight.
Once the message composition box opens on your screen, you can start typing the name in the box to see a list of Smartkarma users to whom you can send a message. You can also find an existing Group Chat (which you are a member of) or create a new Group Chat!
You can Private Message Investors on Smartkarma as well: How to connect with Investors.