Buffalo stocks fell for the week.
The Buffalo Bloomberg Stock Index fell 0.44, or 0.2 percent, to 221.90. Twenty-nine stocks fell and 26 rose. The index has risen 9.2 percent in the past year.
Walgreen, the top U.S. drugstore chain, was among the index's leading decliners, falling $2.52, or 5.5 percent, to $43.71. The company said second-quarter net income rose 14 percent on increased pharmacy sales. Profit was below analysts' estimates, sending the shares to their biggest decline in seven months.
Delphi, the largest auto-parts maker, also fell, losing 23 cents, or 5.1 percent, to $4.32. The Federal Bureau of Investigation began an investigation into Delphi's accounting practices after the auto-parts maker warned of earnings restatements, the Detroit News reported.
J.C. Penney Co. gained $4, or 8.7 percent, to $50.04. Women's Wear Daily reported that a group of private equity firms led by Cerberus Capital Management LP is attempting to take over the retailer for as much as $18 billion.
The Buffalo Bloomberg Stock Index set a 52-week high of 231.18 on Dec. 31 and a 52-week low of 190.26 on May 17.