High-rolling investors have positioned themselves bearish on BlackRock (NYSE:BLK), 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 BLK often signals that someone has privileged information.

Today, Benzinga's options scanner spotted 16 options trades for BlackRock. This is not a typical pattern.

The sentiment among these major traders is split, with 31% bullish and 37% bearish. Among all the options we identified, there was one put, amounting to $28,253, and 15 calls...