The S&P 500 rose 18.72% (+1,210 pts) over the past year on a mixed tape; AAPL, NVDA, MU did most of the lifting, with 29% of the gain between them.
Read the latest market-close note: Nvidia and Goldman Sachs Lead a Narrow Advance as Energy and Staples Slide
AMAZON.COM INC and UNITED AIRLINES HOLDINGS INC moved almost identically (+14.08% vs +14.01%), yet AMZN moved the S&P 500 4,782.3× as much. In a cap-weighted index, the bigger company's weight turns the same percentage move into far more points.
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