When to sell company in a rising trend

If a company is rising continuously then we can monitor the rate of change of that company.

In a technicl analysis 12 day price rate of change of a company becomes 100% we say it is overbought which implies (but not confirm) a downfall or stagnant.

Whenever 12 day ROC becomes 100% you may sell your stock fully or 50% holding.
A speciality in ROC is after crossing 50% within 2 or 3 days it may touch 100%. Hence we can be alert when ROC crosses 50%.

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