It is good to see the recent insider purchase. And an analysis of the transactions over the last year also gives us confidence. Along with the high insider ownership, this analysis suggests that insiders are quite bullish about Eli Lilly. That's what I like to see! While we like knowing what's going on with the insider's ownership and transactions, we make sure to also consider what risks are facing a stock before making any investment decision. In terms of investment risks, we've identified 3 warning signs with Eli Lilly and understanding them should be part of your investment process.