Below are the top 10 best-performing stocks in the S&P 500 index for the past week. Whirlpool Corporation (NYSE:WHR) was the 1st best-performing stock last week in this segment of the market.

Principal Financial Group (PFG) reported fourth-quarter 2011 operating earnings per share of 71 cents, lagging behind the Zacks Consensus Estimate by 4 cents.

PHILADELPHIA, January 31, 2012 - Chuck Cornelio, president of Retirement Plan Services, Lincoln Financial Group, predicts fee disclosure regulations, in-plan guarantees, target date strategies and retirement planning optimism will be significant trends ...

Fort Wayne, IN, January 30, 2012 - Today Lincoln Financial Foundation announced a $1 million grant over three years to Teach For America that will expand efforts to recruit new teachers with math and science expertise, and fund preparation and support ...

FORT WAYNE, Ind., Jan. 30, 2012 /PRNewswire via COMTEX/ -- Today Lincoln Financial Foundation announced a $1 million grant over three years to Teach For America that will expand efforts to recruit new teachers with math and science expertise, ...

Shares of Lincoln National (NYSE:LNC) have bearishly opened below the pivot of $20.90 today and have reached the first support level of $20.58.

Shares of Lincoln National are trading down 5.5% to $20.74 today on above average volume. About 9.3 million shares have been traded today, as compared to the 30-day average volume of 3.9 million shares.

Shares of Lincoln National (NYSE:LNC) opened today below their pivot of $22.71 and have already reached the first level of support at $22.48.

Lincoln National (NYSE: LNC)'s stock had its “neutral” rating reiterated by Zacks Investment Research in a research note issued to investors on Tuesday.

One of today's notable stocks on the rise is Lincoln National (NYSE:LNC), up 2.3% to $23.01. The S&P is trading higher by 0.4% to 1320 and the Dow is trading 0.2% higher to 12747.