ROC 200 — Rate of Change Over 200 Trading Days

ROC 200 — Rate of Change over 200 trading days — is a straightforward momentum metric. It measures what percentage a stock has gained or lost over the past 200 trading sessions, roughly equivalent to one calendar year of market activity.

The Calculation

The formula is simple:

ROC 200 = ((Current Price − Price 200 days ago) / Price 200 days ago) × 100

A ROC 200 of +28% means the stock has appreciated 28% over the period. A ROC 200 of −15% means it has declined 15%.

Why 200 Days?

200 trading days is a widely used timeframe in technical analysis because it smooths out short-term noise while capturing the dominant trend over a meaningful time horizon. It is long enough to reflect genuine structural changes in market perception, short enough to be actionable.

The 200-day moving average is one of the most-watched indicators by institutional investors. Using the same timeframe for ROC provides a consistent way to assess whether a stock is trending above or below its year-ago level.

ROC 200 Colour Coding

L17X displays ROC 200 values with colour coding to make interpretation immediate:

• Strong green (>+30%): Strong positive momentum — the market has significantly re-rated the stock upward over the past year.
• Light green (+10% to +30%): Positive momentum — steady appreciation.
• Amber (0% to +10%): Flat to modestly positive — the stock has broadly tracked its starting level.
• Red (<0%): Negative momentum — the stock is below where it was a year ago.

ROC 200 and Structural Direction

The most analytically interesting use of ROC 200 is in combination with the structural Direction of Movement assessment. When they agree, the picture is consistent — the market is pricing in the structural trajectory that the analysis identifies. When they diverge, it raises questions worth investigating.

A structurally strong company with a deeply negative ROC 200 may represent a dislocation between structural fundamentals and market pricing. Conversely, a structurally weakening company with a strong positive ROC 200 may be priced on momentum that the structural analysis suggests is not supported by competitive position.

What ROC 200 Does Not Capture

ROC 200 is a market-based metric. It captures what market participants have collectively decided about a stock over the period. It does not capture why they made that decision, whether the re-rating reflects structural insight or narrative momentum, or whether the current level is justified by fundamentals. For those questions, the structural Power Mapping analysis provides the complementary framework.