Investors with significant funds have taken a bullish position in McKesson (NYSE:MCK), a development that retail traders should be aware of.

This was brought to our attention today through our monitoring of publicly accessible options data at Benzinga. The exact nature of these investors remains a mystery, but such a major move in MCK usually indicates foreknowledge of upcoming events.

Today, Benzinga's options scanner identified 12 options transactions for McKesson. This is an unusual occurrence. The sentiment among these large-scale traders is mixed, with 58% being bullish and 25% bearish. Of all the options we discovered, 11 are puts, valued at...