Teradyne Is Down 14% in 10 Days. What History Says Now.

Teradyne, Inc. (TER) has fallen 13.9% from its all-time high in just 10 days of trading. This rapid descent has pushed the stock out of its stable green zone and into the yellow zone, signaling a period of moderately elevated risk for the semiconductor testing equipment manufacturer.

As of May 9, 2026, Teradyne, Inc. (TER) is trading at $359.77, a significant retreat from its record peak of $418.08. While a double-digit decline in less than two weeks may seem alarming, our data provides a specific framework for understanding this movement through the lens of historical volatility. The current Drawdown Severity Score™ stands at 2.2, which categorizes this pullback as "Moderately Elevated."

Understanding the Drawdown Severity Score™

The move from the green zone to the yellow zone is a statistical shift in the stock's risk profile. In our system, the green zone represents normal market noise and standard price fluctuations. By crossing the 2.0 threshold on the Drawdown Severity Score™ scale, TER has entered a phase where the selling pressure exceeds typical historical variance.

Our data shows that this is not an isolated incident for the stock. Throughout its trading history, we have recorded 91 total drawdown events for Teradyne. The current 13.9% decline has already surpassed the stock's historical average max drawdown of -10.6%. This indicates that the current selling cycle is already more intense than the median pullback experienced by long-term shareholders.

When a stock enters the yellow zone, it often indicates a transition point. Historically, stocks in this zone either find support as value seekers enter the fray or they continue to deteriorate into the orange or red zones if fundamental headwinds persist. For TER, the speed of this 10-day drop is the primary factor driving the elevated severity score.

Historical Context and Comparable Declines

To understand where TER might go next, we look at how the stock has behaved during previous periods of extreme stress. Our data identifies 4 specific times in the company's history where the stock has experienced a drawdown of 70% or greater.

These massive historical corrections had an average duration of 2,819 days. It is crucial to note that this is a small sample size of only 4 events, which can skew averages significantly. However, these figures serve as a reminder of the high-beta nature of the semiconductor equipment sector. While the current 13.9% drop is far from those historic 70% collapses, the Drawdown Severity Score™ of 2.2 suggests we are currently watching a move that is more aggressive than a standard "dip."

Comparing the current 10-day window to the historical average drawdown duration of 159 days shows that this move is still in its early stages. If TER follows its historical mean, the recovery process could be a multi-month endeavor rather than a quick "V-shaped" bounce.

Sector Volatility and Market Positioning

Teradyne does not trade in a vacuum. As a leader in automated test equipment, its price action is often a bellwether for the broader semiconductor industry. When we see the Drawdown Severity Score™ rise for a company like TER, it often reflects broader anxieties about capital expenditure cycles in the chip industry or shifts in global manufacturing demand.

Our data shows that the current drawdown is currently 3.3 percentage points deeper than the stock's historical average. This gap is what investors should focus on. When a stock exceeds its average drawdown depth, it often requires a fresh fundamental catalyst to reverse the trend. Without such a catalyst, the technical "gravity" of the drawdown can persist.

Key Thresholds to Monitor

As of May 9, 2026, the primary concern for investors is whether the Drawdown Severity Score™ will stabilize in the yellow zone or continue to climb. A move toward a score of 4.0 would shift the stock into the orange zone, indicating a "High" severity level that has historically preceded even deeper corrections.

We are currently monitoring the $350 level as a psychological benchmark. If the stock fails to find support near the current $359.77 mark, the drawdown could quickly extend toward the 20% "bear market" threshold for the individual ticker. Conversely, a period of sideways consolidation would allow the severity score to plateau, potentially signaling that the worst of the 10-day sell-off has passed.

The historical average duration of 159 days for a TER drawdown suggests that patience is often required. Investors who track the Drawdown Severity Score™ can use these zones to strip away the emotional noise of a falling share price and focus on the cold, hard data of historical probability.