This past week, eight of the Dow Jones Industrial Average's (INDEX: ^DJI) 30 components reported earnings: McDonald's (NYSE: MCD), Du Pont, AT&T (NYSE: T), Travelers, Untied Technologies (NYSE: UTX), Caterpillar, Boeing (NYSE: BA), and 3M.

In case you missed the releases, let's look at a four of them today and see how they performed during the second quarter of 2013.

On Monday, McDonald's Q2 earnings release showed revenue of $7.08 billion, while analysts were looking for $7.09 billion. Earnings came in at $1.38 per share, against expectations of $1.40. Gross margin fell slightly, while operating margin increased 70 basis points compared with the same quarter last year. Weak same-store sales growth and a warning from management caused the stock to fall on the earnings release and helped shares decline 2.23% during the week.  

On Tuesday, we got reports from AT&T and United Technologies. AT&T reported revenue of $32.1 billion, a 1.6% increase from the previous year, while analysts expected just $31.8 billion in sales. Earnings per share had been estimated to hit $0.68, but AT&T fell short at $0.67, a penny higher than the second quarter of 2012. The company also indicated that it added 551,000 new contracts, which was higher than during the first quarter, but the majority of the new contracts were for tablets, which have a lower profit margin. Shares of AT&T ultimately lost 0.58% during the week.

United Technologies earned $1.70 per share, much higher than last year's $1.62 and analysts' prediction of $1.57, while revenue came at $16 billion, below the $16.37 billion Wall Street wanted to see. Lower costs and a strong aerospace unit helped United Technologies beat the Street on the bottom line, where it really matters. Management said it feels good about the remainder of the year and increased the low end of its full-year guidance from $5.85 per share to $6.00, while the top end stayed the same at $6.15 per share. United Technologies ended up gaining 2.43% this past week. 

On Wednesday, Boeing reported that its Q2 profit was $1.1 billion, or $1.41 per share, on revenue of $21.8 billion. That was good enough to beat last year's figures of $1.27 in EPS on $20 billion in sales, but analysts had been expecting EPS of $1.58 on $21.05 billion in revenue. Although the company missed on EPS, the quarter was seen as a slight win for Boeing, after dealing with the 787 Dreamliner's grounding earlier in the year and concerns about how those problems would affect sales. Still, for the week the stock ended down 1.27%. 

Check back tomorrow at 1 p.m. ET for a recap on the other four Dow components that reported this past week.

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Fool contributor Matt Thalman has no position in any stocks mentioned. Check back Monday through Friday as Matt explains what caused the Dow's winners and losers of the day, and every Saturday for a weekly recap. Follow Matt on Twitter: @mthalman5513

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