Coral Tree Partners, a private equity firm, agreed to invest in Subject Matter, a provider of advertising services. Financial terms were not disclosed. "The Coral Tree partnership marks the next chapter in Subject Matter's story. We've proven that the combination of strategic thinking, creative ideas, and coordinated execution is a winning formula. With Coral Tree we have an opportunity to take it to the next level, crafting customized, creative strategies that deliver real time results and align with longer term strategic positioning and objectives," Steve Elmendorf, Subject Matter Managing Partner.