The article Track Institutional Buying, Not Analysts states that:
Mutual funds, insurance companies, pension funds and other institutional investors rely on their own research. Contrary to analysts who publish their recommendations, institutions keep opinions to themselves. They're also reluctant to give any hint of what they're trading
Why is this so? Institutions have the same reason to recommend the stocks they are buying, to drive its price up. What good do they achieve by keeping the info secret?