All 30 components of the Dow Jones Industrial Average

DJIA, -2.37%

are losing ground in morning trade Thursday, with just three of the components accounting for more than one-third of the Dow’s 490-point loss, enough to push the blue-chip barometer into negative territory for the year. The biggest drag was Boeing Co.’s

BA, -5.94%

with the shares shedding 4.5%, and the $15.48 price decline subtracting about 105 points from the Dow’s price. Next is UnitedHealth Group Inc.

UNH, -3.75%

with the shares down $7.29, or 2.6%, to shave about 49 points off the Dow; Apple Inc.’s stock

AAPL, -3.12%

was the third biggest drag, as it fell $5.06, or 2.9%, to knock about 34 points off the Dow. The Dow has now slipped 0.6% year to date, while the S&P 500

SPX, -2.20%

has lost 0.7% and the Nasdaq Composite

COMP, -1.81%

has gained 2.4%.

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