Humana Inc. 's ( HUM ) second-quarter 2012 operating earnings per share came in at $2.19, lagging the Zacks Consensus Estimate of $2.23 as well as the year-ago earnings of $2.59 per share.

U.S. stocks were trading mixed Tuesday as the Dow Jones Industrial Average recently fell 31 points to 13043, the Standard & Poor's 500-stock index shed 3.1 points to 1382, and the Nasdaq Composite rose a point to 2947.

--Earnings decline due to smaller benefit from excess reserves. --Results still top Wall Street expectations. --Aetna raises full-year guidance.

Here are nine stocks that fell to 52-week lows: While trading on below-average volume, Facebook Inc. - Class A (FB) dipped today, hitting and then dropping past its previous 52-week low to $21.86.

U.S. stocks were trading mixed Tuesday as the Dow Jones Industrial Average recently fell 19 points to 13054, the Standard & Poor's 500-stock index shed 1.6 points to 1384, and the Nasdaq Composite rose two points to 2948.

By Russ Britt, MarketWatch. LOS ANGELES (MarketWatch) - Shares of Humana Inc. tumbled more than 14% Tuesday, a day after the managed-care provider reported second-quarter earnings and cut its profit outlook for the year, a move that dragged at ...

Humana and dLife Launch Multimedia Diabetes Engagement Experience for Medicare Advantage Members. LOUISVILLE, Ky. & WESTPORT, Conn.

Humana Inc. (HUM) (HUM), the second-biggest provider of Medicare benefits, fell the most in more than three years after cutting its 2012 profit forecast on higher-than- anticipated costs.

--Humana reports weaker earnings and lowers guidance. --Company cites high costs for new Medicare-Advantage members, higher health-system usage by new and old members.

U.S. stocks closed slightly lower Monday as the Dow Jones Industrial Average lost 2.7 points to 13073, the Standard & Poor's 500-stock index fell fractionally to 1386 and the Nasdaq Composite declined 12 points to 2946.