The U.S.’ bluechip stock index is mired in its longest stretch in the red since 1978, a potentially concerning signal for investors enjoying an otherwise sanguine period for stocks, though Tuesday’s losses are largely tied to a singular company—UnitedHealth Group—and gains remain healthy over a longer timeframe.

The Dow Jones Industrial Average fell for a ninth straight day on Tuesday, its longest losing streak since 1978.

The Dow Jones Industrial Average has notched nine straight days of losses, weighed down in large part by UnitedHealth Group since the killing of Brian Thompson.