新上市公司擁有長度不一的「蜜月期」，這個現象經由洪日爛（民68），王瑞儀（民78），賈武健（民80），顏美英（民81）和本研究可證實新上市公司的報酬高於市場報酬。且本研究發現，七十九年至八十一年間七十家新上市公司其投資報酬率接近百分之五十。針對此問題，國外亦有類似的研究，結果發現初次公開發行股票公司之原始報酬在百分之十左右(Ibbotson & Jaffe, 1975; Ritter, 1984; Chalk & Peavy,1985; Jog & Riding, 1987)。持股比例，

但在本研究實證結果中，此變數並未達顯著水準。

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