TSM Down 13% in 37 Days. What History Says Now

TSM Down 13.4% in 37 Days: What History Suggests

Taiwan Semiconductor Manufacturing Company Limited (TSM) is down 13.4% from its all-time high as of August 18, 2026, and has been falling for exactly 37 days. The Drawdown Severity Score™ stands at 2.5, placing the stock in the Moderately Elevated yellow zone. In 30 comparable prior drops of this depth, TSM took an average of 292 days to recover.

TSM Shifts From Green to Yellow Zone

The transition of TSM from the green zone to the yellow zone marks a notable shift in the stock's risk profile as of August 18, 2026. The green zone represents normal, low-severity price fluctuations that align with the stock's typical market noise. Crossing into the yellow zone, signaled by a Drawdown Severity Score™ of 2.5, indicates that the current sell-off has exceeded standard volatility thresholds. This Moderately Elevated classification serves as an early indicator that the stock is experiencing a more structural pullback rather than a routine fluctuation.

With the current price recorded at $413.41 against the peak of $477.57, the drawdown has reached exactly -13.4% over a span of 37 days. This duration of 37 days shows how rapidly the current decline has materialized. In our analytical framework, the combination of speed and depth is what triggers a zone change. When an asset moves from the green zone to the yellow zone, it alerts investors that historical boundaries for minor pullbacks have been breached, requiring a closer look at historical recovery patterns.

Historical Baseline of TSM Drawdown Events

To evaluate the significance of the current -13.4% decline, we must compare it to the complete historical record of the asset. Since August 14, 2006, TSM has experienced a total of 175 historical drawdown events. A drawdown event is defined as any period where the stock price trades below its previous all-time high. Across all 175 of these historical events, the average maximum drawdown depth was -6.0%. This means the current decline of -13.4% is more than double the historical average depth for TSM drawdowns.

The average duration for all historical drawdown events stands at 58 days. This duration measures the entire cycle from the peak, through the trough, and back to a new high. At 37 days into the current drawdown, TSM is still well below the historical average duration of 58 days. This suggests that while the depth of the current sell-off is unusually severe, the timeline is still in its early stages relative to the average historical cycle. The rapid descent to -13.4% in just 37 days highlights a high-velocity correction that differs from the slower, shallower declines that characterize the majority of TSM's historical drawdowns.

Historical Analysis of 10% or Greater Drops

While TSM has recorded 175 drawdown events of all sizes, the subset of deeper declines provides the most relevant comparison for the current situation. Our data shows that TSM has experienced a drawdown of 10% or greater exactly 30 times since August 14, 2006. When the stock breaches this 10% threshold, the historical recovery timeline lengthens dramatically compared to minor pullbacks.

The average duration of these 30 comparable drops is 292 days. This 292-day average recovery period represents the total time required for the stock to descend to its trough and subsequently climb back to reclaim its previous peak. Comparing the current duration of 37 days to this historical average of 292 days reveals a substantial gap. If the current drawdown follows the historical average of its 30 predecessor events, the stock may remain below its all-time high of $477.57 for a prolonged period. This historical comparison underlines why the yellow zone classification is appropriate: a breach of the 10% threshold has historically transitioned TSM from a short-term dip into a multi-month recovery process.

Valuation Context Within Historical Ranges

To provide deeper historical context, we examine TSM's valuation multiples as of the snapshot date of 2026-08-16. Despite the price drawdown of -13.4%, the asset's multiples remain exceptionally high relative to its own long-term historical distribution. The Price-to-Sales (P/S) ratio stands at 15.6, placing it in the 98th percentile of its own daily P/S record since 2006-08-14. This is more than double the historical median P/S ratio of 6.1. Similarly, the EV-to-EBITDA (EV/EBITDA) ratio is recorded at 21.2, which also sits in the 98th percentile of its own daily history since 2006-08-14, compared to a historical median of 8.9. This statistical positioning indicates that the valuation multiples are near the absolute top of TSM's historical range, meaning the recent price decline has done little to bring the multiples back toward historical averages.

Understanding the Drawdown Severity Score™

The Drawdown Severity Score™ is a proprietary metric designed to quantify the intensity of an asset's price decline. It operates on a scale that takes into account both the absolute depth of the drawdown and the speed at which the decline occurs. By comparing the current price action against the asset's entire history, the score determines whether a pullback is normal or anomalous. A score of 2.5 places TSM in the Moderately Elevated yellow zone, indicating that the current price behavior is statistically significant but has not yet reached the extreme levels associated with the red zone.

This scoring system allows investors to filter out daily market noise and focus on structured changes in price regimes. In the case of TSM, the move from the green zone to the yellow zone is a direct reflection of the current drawdown crossing the 10% threshold. The score of 2.5 indicates that while the decline is deep compared to the average drawdown of -6.0%, it still remains within the historical boundaries established by the 30 prior comparable events. Should the drawdown deepen or persist for an extended period without recovery, the severity score will adjust to reflect the escalating risk.

Quantitative Risk Framing and Data Limits

We emphasize that this analysis is based entirely on historical price and drawdown metrics. Our platform does not analyze corporate earnings, industry-wide semiconductor demand, geopolitical factors, or macroeconomic trends. The historical averages and percentiles presented here are mathematical realities of TSM's stock performance since August 14, 2006, and are not predictive of future price movements.

Past performance does not guarantee future results, and historical recovery timelines may not apply to the current market environment. The 292-day average recovery duration for comparable drops is a historical average, meaning some recovery periods were shorter while others were significantly longer. This data-only framework is designed to provide objective, historical context to help investors understand the statistical significance of the current price action.

Key Metrics and Thresholds to Watch

As TSM continues to navigate the yellow zone, several key quantitative markers will determine the future trajectory of its severity score. First, investors should monitor the $413.41 price level. Any further decline will push the drawdown deeper than -13.4%, potentially increasing the Drawdown Severity Score™ toward the high-risk red zone.

Second, the duration of the drawdown is a critical factor. The current duration of 37 days is still early in the context of the historical 292-day average recovery timeline for 10% or greater drops. If TSM remains below its all-time high of $477.57 as the days accumulate, the prolonged duration will exert upward pressure on the severity score, even if the price stabilizes.

Finally, tracking the recovery velocity will show whether this event behaves like a typical historical correction. A rapid return to the green zone would represent a stronger-than-average recovery, while a prolonged stay in the yellow zone would align with the 292-day historical pattern. We will continue to track these metrics and update the Drawdown Severity Score™ as new daily price data is recorded.