Nielsen Holdings (NLSN) slid 7.4% after rejecting an unsolicited $9.1 billion buyout proposal from a group of private equity firms, saying the $25.40 per share offer significantly undervalues the media measurement and analytics company. Sea (SE) declined 7% after HSBC cut its price target for the Singapore digital entertainment and ecommerce platform by $115 to $150 a share while reiterating its buy rating for the stock. The ride-hailing company said it was partnering with fintech firm Payfare to begin a cash-back rewards program for its US drivers in response to the recent spike in gasoline prices.