Another dive in energy stocks offset gains for health care and technology companies, leaving major US indexes mostly lower, the AP reports. Bond yields held steady Wednesday, while stocks in mainland China got a small boost after they got the OK to join a widely followed index of emerging-market stocks. Rig operator Transocean dropped 5%, and AT&T fell 1.3%. Advanced Micro Devices soared 10.6%. Eight of the 11 sectors in the Standard & Poor's 500 index fell. The S&P 500 lost 1 point to 2,435. The Dow Jones industrial average gave up 57 points, or 0.3%, to 21,410. The Nasdaq composite rose 45 points, or 0.7%, to 6,233. (More stock market stories.)