Shares of ICICI Prudential Life Insurance Company tanked over 10% on Thursday to the day's low of Rs 463.45 in Thursday's trade on the NSE as the Street was unimpressed by the company's December quarter earnings which saw a 3% increase in net profit to Rs 227 crore versus Rs 220 crore reported in the year-ago period. Net premium income was up 5% year-on-year (YoY) to Rs 9,928 crore mainly due to growth in first-year premium.