Exit Strategy

Hi,
 
Recently, I’m in a dilemma and would like to seek your guidance on the following:
Lets say, I purchased a stock at an undervalued price with a 40% margin of safety…but then recently there is a hype in the counter due to its 3rd quarter results are above expectations and was already higher than last year’s revenue, net profit & operating cash flows, hence, its share price shoot up way above my own calculation of intrinsic value (which is based on its average historical PE & its PEG at the time of my calculations prior to the release of the 3rd quarter results).
So, I recalculate its intrinsic value again and this time is has changed to a higher value but the current share price is still above the recalculated intrinsic value. My question to you is that, do you still sell the stock when:

1. The company is still fundamentally strong;
2.  My entry price is still way below the recalculated intrinsic value; BUT
3. Current share price is above the recalculated intrinsic value by 10%.

Regards,
Thomas