Softbank’s chip designer Arm has confidentially filed to go public, seeking a valuation of $30 billion to $70 billion in what is shaping up to be the biggest IPO of the year. Could it be the key to thawing a frozen IPO pipeline? Plus, investor Brad Gerstner lit into Sundar Pichai for losing Google’s AI lead to OpenAI, leaving investors questioning whether he can get tough on the issue.