Adding to winning stock picks can feel uncomfortable. Often when stocks reach new all-time highs, their valuations become too formidable for investors to stomach additional purchases.

Worse yet, investors may suffer from anchoring bias after seeing this jump in share price, thinking, "I could have just bought this for 25% less six months ago." However, adding to winning stocks is an investing exercise that should be considered, because winning stocks tend to keep winning.

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Source Fool.com