Odaily Planet Daily reported that Scott Rubner, head of equity and equity derivatives strategy at Castle Securities, said that this round of rally that has pushed the U.S. stock market to new highs may experience some fluctuations in the next few weeks, but is expected to end strongly before the end of the year. Rubner wrote that the S&P 500 has risen 17% from its low point for the year, and short-term risks include overvaluation, seasonal fluctuations common in September and October, and possible selling by trend-following funds. However, these potential signs of weakness are unlikely to last, as the tailwinds supporting the stock market's rise - including corporate spending on artificial intelligence and demand from retail investors - will continue to power the market in the final months of 2025. "Stay positive on structural demand, but hedge against short-term risks as September to October remains a fragile window," Rubner wrote, adding that investors should view short-term pullbacks as buying opportunities.