For Zach Grannis, who leads business development for crowdfunding platform CircleUp Network Inc., San Francisco, a clue into a valuable investment strategy came in the form of a special report in Fortune. From the article published last May and titled “Special Report: The war on big food,” he learned that the equivalent of $18 billion in market share had moved from mass food brands to smaller rivals since 2009.
“A lot of that was driven by a fundamental shift from what my pare…