The phrase "worried investors" refers to people who have concerns or anxieties about their investments, typically because they are unsure if they will make money or lose money. Full definition
However, this shouldn't worry investors at all. (bitcoinprice.com)
The only worry investors should have is if index selling leads to successive rounds of ETF and passive mutual fund selling, which could lead to more negative feedback loop selling. (dailytradealert.com)
But that's unlikely to worry investors given the considerably better - than - expected payroll improvement. (fortune.com)