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Group 1 - In July, U.S. retail investors significantly entered the stock market, pushing the S&P 500 index to set multiple closing records, while corporate executives exhibited a contrasting trend by reducing their stock purchases to the lowest level since at least 2018 [1] - The buying-to-selling ratio of corporate insiders reached its lowest level in a year, indicating a cautious stance among executives despite a slowdown in selling activity [1][2] - The S&P 500 index's forward P/E ratio rose to nearly 23 times, significantly above the 10-year average of about 18 times, suggesting concerns over market valuations among corporate executives [2][3] Group 2 - Retail investors have become the primary driving force behind the recent market rally, with their participation in S&P 500 index flows reaching 12.63%, the highest since February [2] - Corporate buyback activities have also slowed, with data indicating that buybacks have been below typical seasonal levels for four consecutive weeks, reflecting a shift in corporate sentiment towards protecting balance sheets rather than boosting market confidence [5][6] - The recent slowdown in the U.S. labor market and rising inflation indicators have contributed to a more cautious outlook among corporate executives, as evidenced by a significant downward revision in job growth figures [3][6]