Every weekday, the CNBC Investing Club with Jim Cramer releases the Homestretch — an actionable afternoon update, just in time for the last hour of trading on Wall Street. Market update: Stocks are headed lower on Friday, but the S & P 500 is still on pace for a weekly gain of about 1%. This week had some counter-trend components, with value stocks outperforming while more momentum-based companies lagged. Top grade this week : Health care was the best-performing sector this week, and the group was near the top of the leaderboard even before a 13F filing from Berkshire Hathaway revealed that the company had purchased a stake in the beleaguered UnitedHealth Group in the second quarter. Eli Lilly was another large-cap health-care stock that bounced back. The pharma giant had an ugly sell-off

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