The stock market indices had a difficult session, especially the blue chips. Apple Inc. (AAPL) was a standout today, up nearly 16 points, which certainly helped the Nasdaq 100 eke out a fractional gain.

Here are three stocks that hit 52-week highs: The share price of Dorman Products (DORM) improved today, reaching and then surpassing its previous 52-week high of $26.16.

The Consumer Cyclical sector (XLY) showed little movement on a trading day that saw S&P 500 fall 0.7%. As a proxy for the sector, the ETF tracked closer to the overall market today than over the past month.

Auto makers, along with car and truck parts retailers, rolled to big gains in Tuesday afternoon trading, led by Goodyear Tire & Rubber (GT), which reported second-quarter profit that topped analyst estimates.

Earnings announcements for Tuesday, July 31st: Arkansas Best Corp (NASDAQ: ABFS) announced its earnings results on Tuesday. The company reported $0.44 earnings per share for the quarter, beating the analysts' consensus estimate of $0.16 by $0.28.

The following table lists the 92 U.S. companies that reported quarterly earnings today (end date of the quarter is noted in the last column).

The following U.S. companies reported positive surprises or matched expectations today. This list ranks percent surprises of actual earnings to earnings estimates.

COLMAR, PA, Jul 31, 2012 (MARKETWIRE via COMTEX) -- Dorman Products, Inc. (NASDAQ:DORM) today announced financial results for the second quarter ended June 30, 2012.

Below are the top stocks in the auto parts industry in terms of operating margin. The trailing-twelve-month operating margin at Gentex (NASDAQ: GNTX) is 21.90%.

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