High-rolling investors have positioned themselves bullish on Merck & Co (NYSE:MRK), and it's important for retail traders to take note.\This activity came to our attention today through Benzinga's tracking of publicly available options data. The identities of these investors are uncertain, but such a significant move in MRK often signals that someone has privileged information.Today, Benzinga's options scanner spotted 9 options trades for Merck & Co. This is not a typical pattern.The sentiment among these m ...