The shares of Life360 Inc., the owner of Bluetooth tracking device brand Tile, struggled to hold onto the offer price after the company and some of its shareholders raised $155.3 million in a US initial public offering.The shares opened at $26 each on Thursday, 3.7% below the $27 per share offering price, but have since edged higher. They were trading at $26.78 each as of 3:10 p.m. in New York....