U.S. stocks opened mixed on Wednesday as Boeing rose after reaffirming the timeline for its grounded 737 MAX’s return to service, countering losses from Caterpillar and Texas Instruments, which fell on weak forecasts. The Dow Jones Industrial AverageI rose 47.14 points, or 0.18%, at the open to 26,835.24. The S&P 500  opened lower by 1.98 points, or 0.07%, at 2,994.01. The Nasdaq Composite  dropped 14.06 points, or 0.17%, to 8,090.24 at the opening bell.