All 30 Dow stocks fall premarket, led by Boeing’s and Salesforce’s stocks

The selloff in the Dow Jones Industrial Average
DJIA,
+0.30%
is unanimous, as all 30 components are losing ground in premarket trading. The biggest percentage decliners were shares of Boeing Co.
BA,
-1.85%,
which fell 2.6%; Salesforce.com Inc.
CRM,
-0.72%,
which slid 2.3%; and J.P. Morgan Chase & Co.
JPM,
+0.12%,
which dropped 2.2%. The best performer was Verizon Communications Inc.’s stock
VZ,
+0.22%,
as it slipped just 0.6%. Dow futures tumbled 485 points, or 1.4%, amid concerns over outlook for economic growth.