Oct 18 (Reuters) - The following are the top stories in the Wall Street Journal. Reuters has not verified these stories and does not vouch for their accuracy.

* SAC Capital and federal prosecutors have agreed in principle on a penalty exceeding $1 billion in a potential criminal settlement that would be the largest ever for an insider-trading case. ()

* Insurers say the federal healthcare marketplace is generating flawed data that is straining their ability to handle even the trickle of enrollees who have gotten through so far. ()

* Chinese PC maker Lenovo is actively considering a bid for all of BlackBerry and has signed a non-disclosure agreement with the smartphone maker. ()

* A late surge of cases against low-level offenders will push the SEC's case total close to last year's levels, masking a steep drop in enforcement actions related to the financial crisis. While the total hasn't been announced, it likely will be down at least 5 percent from a near-record high of 734 enforcement cases in fiscal 2012. ()

* Google posted a 12 percent increase in third-quarter revenue, as it tries to keep pace with its users' shift to mobile devices. ()

* Video-streaming service Hulu on Thursday named Mike Hopkins as its new chief executive, effective immediately. Hopkins has been president of Fox Networks Group, a division of 21st Century Fox Inc, since 2008 and a member of Hulu's board since 2011. ()

* A U.S. district judge ordered subprime lender Household International Inc - now part of HSBC Holdings PLC - to pay investors $2.46 billion in a class-action lawsuit, a move that comes several years after a jury found the company liable for securities fraud. ()

* IBM is shaking up leadership of its growth-markets unit, following disappointing third-quarter results that prompted a critical internal email from CEO Virginia Rometty. She wrote that IBM's strategy is correct, but criticized the company for failing to execute in sales of computer hardware as well as in the growth markets unit, whose sales territory includes markets in Southeast Asia, Eastern Europe, the Middle East and Latin America. ()