Chip stocks' 20% drops have sparked recoveries—but that pattern may not hold forever

Semiconductor stocks have entered a sharp downturn, with memory-related names sliding more than 20% into bear market territory and the broader chip sector shedding hundreds of billions in value. This marks another significant pullback in an otherwise strong period for chip stocks driven by artificial intelligence infrastructure spending.

Throughout the current AI cycle, investors have repeatedly profited from buying sharp sell-offs in chip stocks. When Broadcom spooked the market with cautious guidance earlier this year, the sector shed more than $1 trillion（約160兆円） in value in a matter of days, but quickly rebounded as market participants recognized that AI infrastructure spending was still climbing. The reason these dips have consistently been bought is rooted in fundamental supply-demand dynamics: demand kept reaccelerating faster than supply could grow. Global chip sales hit a record in 2025 and are forecast to jump again in 2026, with AI-related chips accounting for roughly half of the total. As long as data center build-outs remained hungry and memory stayed in short supply, every pullback looked cheap in hindsight.

Yet history offers a sobering counterpoint. The semiconductor industry occupies a highly cyclical corner of the market, and past downturns have shown that not all rebounds are quick or universal. Previous busts have followed a consistent pattern: surging demand invites a wave of new capacity, eventually supply catches up with demand, and prices fall sharply. Past downturns have carried the sector down 30%, 50%, or even 80% from its highs. Warnings that the memory shortage could flip into oversupply by 2027 or 2028 are getting louder. A 20% dip appears to be a bargain opportunity while the cycle is still accelerating, but once the cycle turns, the same "buy the dip" instinct can become a costly trap.

For investors considering whether to buy this weakness, the near-term outlook still favors recovery: the shortage driving the current boom looks set to persist into 2027, and demand shows little sign of cracking. However, treating "history says buy the dip" as a probability rather than a promise is prudent. The strategy has worked because the sector remains inside an up cycle, but no one rings a bell at the market's peak. For patient investors, adding high-quality chipmakers to current weakness is reasonable, provided positions are sized with the knowledge that the eventual downturn—whenever it arrives—tends to be far deeper than 20%.

The semiconductor sector's volatility during the current AI cycle has created a pattern that investors have learned to exploit. Throughout this upswing, sharp sell-offs—including the more than $1 trillion（約160兆円） value loss following Broadcom's cautious guidance earlier this year—have repeatedly reversed as demand for AI-related chips continued to accelerate. Global chip sales hit a record in 2025 and are forecast to jump again in 2026, with AI-related chips representing roughly half of the total. This sustained demand, coupled with persistent memory shortages, has made each pullback look like a buying opportunity in hindsight.

However, the sector's historical pattern suggests caution. Semiconductors occupy a highly cyclical corner of the market, and past downturns have shown that not all recoveries are swift or broad-based. Previous busts have followed a predictable script: surging demand invites new capacity, supply eventually catches up, and prices fall sharply. Warnings that memory oversupply could emerge by 2027 or 2028 are becoming more common. Past semiconductor downturns have carried the sector down 30%, 50%, or even 80% from peak levels—substantially deeper than the current 20% dip. The challenge for investors is that a 20% pullback appears cheap until the cycle genuinely turns, at which point the same buying instinct becomes a trap.