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Stock Market Today: Tech Rout Drives Indexes Below Crucial Lines; Reddit Rides Higher (Live Coverage)

By Mark GrundellYahoo FinanceDecember 17, 2025 at 8:44 PMBearish1 min read

Tech Sell-off Pushes S&P 500, Nasdaq Below Key Support; Reddit Defies Trend

A broad market decline, led by a tech sell-off, saw major indexes breach crucial technical levels, signaling a potential shift in investor sentiment. This move away from high-growth tech is a key development.

Analyst sentiment: Bearish
What to watch next

Investors will closely monitor whether these indexes can reclaim support levels amidst ongoing economic data releases.

U.S. stock indexes, including the S&P 500 and Nasdaq, experienced a significant downturn, dropping below key technical support levels. This broader market decline was primarily driven by a sharp sell-off in the technology sector, indicating a potential shift in market sentiment away from high-growth tech stocks. Meanwhile, Reddit (RDDT) defied the negative trend, seeing its shares rise in trading.

U.S. stock indexes, including the S&P 500 and Nasdaq, experienced a significant downturn, dropping below key technical support levels. This broader market decline was primarily driven by a sharp sell-off in the technology sector, indicating a potential shift in market sentiment away from high-growth tech stocks. This move highlights investor caution amid inflation concerns and shifting interest rate expectations, impacting valuations previously driven by future growth prospects. For investors, the breach of these support levels typically signals increased volatility and potential for further downside, prompting a re-evaluation of portfolio allocations, particularly in growth-oriented sectors. The tech sector, often sensitive to interest rate hikes, bore the brunt of the selling pressure as investors rotated towards perceived safer assets or value plays. This re-pricing mechanism in the market reflects evolving economic outlooks and monetary policy considerations. Notably, Reddit (RDDT) defied the negative trend, seeing its shares rise in trading, a unique outlier amidst the broader market's decline. The ability of individual stocks to buck a widespread downturn can reflect idiosyncratic company news or strong underlying investor conviction. Investors will now closely watch for sustained signs of recovery in the tech sector, or a continued rotation into other market segments, as central bank rhetoric and economic data continue to unfold this quarter. The ability of major indices to reclaim critical support levels will be a key indicator.

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