BOSTON (TheStreet) -- Stocks have been swinging wildly this year after rallying in 2009, bewildering investors who've been hoping for a steady recovery.

Amid the chaos, there have been some standouts this year, especially among small banks and food companies. Here are the 10 best-performing S&P 500 stocks so far in 2010. The shares are ordered by performance, from the smallest to biggest return.

10. Dr Pepper Snapple Group ( DPS) has advanced 33% in 2010 and 71% during the past 12 months. First-quarter profit tumbled 33% to $89 million, or 35 cents, as revenue declined 1%. The operating margin remained steady at 16%, lagging the tallies of beverage titans Coca-Cola ( KO) and Pepsi ( PEP). Dr Pepper Snapple Group trades at a price-to-sales ratio of 1.7 and a price-to-cash-flow ratio of 5.7, 44% and 53% discounts to industry averages.

9. Tyson Foods ( TSN - Get Report), seller of chicken, beef, pork and prepared foods, has rallied 36% in 2010 as the market dropped. It has gained 32% during the past year. Tyson swung to a fiscal second-quarter profit of $159 million, or 42 cents, as revenue increased 9.7%. The operating margin extended from 0.7% to 5%. Tyson sells for a price-to-projected-earnings ratio of 8.5 and a price-to-sales ratio of 0.2, 42% and 83% discounts to food products peer averages.

8. Chocolate seller Hershey ( HSY - Get Report) has returned 39% in 2010 and 36% during the past 12 months. First-quarter profit nearly doubled to $147 million, or 64 cents, as revenue climbed 14%. The operating margin widened from 14% to 18%. Hershey trades at a premium to food products peers based on trailing and projected earnings. But its PEG ratio, a measure of value relative to predicted long-run growth, of 0.8 signals a 20% discount to fair value.

7. Regional bank KeyCorp ( KEY - Get Report) has gained 41% so far in 2010 and 48% in the past year. KeyCorp's first-quarter loss narrowed 89% to $55 million, or 11 cents, as revenue declined 7.8%. The operating margin turned positive. KeyCorp sells for a price-to-book ratio of 0.6 and a price-to-cash-flow ratio of 2.1, indicating discounts of 46% and 79% to financial services industry averages. The company has been unprofitable for eight consecutive quarters.

6. Cummins ( CMI - Get Report), a maker of engines and engine components, has appreciated 42% so far this year. It has more than doubled during the past year. First-quarter profit soared to $149 million, or 75 cents, from $7 million, or 4 cents, a year earlier. Revenue inched up 1.6%. The operating margin stretched from 2.5% to 7%. Cummins trades at a PEG ratio of 0.3, reflecting a discount of 70% to projected long-run growth. It's also cheap based on projected earnings.

5. Specialized metal company Titanium Metals ( TIE) has increased 49% in 2010 and 139% over the past 12 months. First-quarter profit decreased 15% to $17 million, or 9 cents, as revenue grew 6.9%. The operating margin fell from 12% to 11%. Titanium Metals sells for a price-to-sales ratio of 4 and a price-to-cash-flow ratio of 14, 48% and 32% discounts to metals and mining peer averages. Its PEG ratio of 0.9 reflects a 10% discount to fair value.

4. SanDisk ( SNDK) designs flash storage devices for consumer electronics, including cameras and phones. Its stock has soared 50% in 2010 and has more than tripled in one year. SanDisk swung to a first-quarter profit of $235 million, or 99 cents, from a loss of $208 million, or 92 cents, a year earlier. The stock's PEG ratio of 0.1 signals a 90% discount to fair value. Its forward earnings multiple of 11 reflects a 28% discount to the computers and peripherals peer average.

3. Ohio regional bank Huntington Bancshares ( HBAN) has soared 55% in 2010 and 51% during the past 12 months. Huntington swung to a first-quarter profit of $40 million, or 1 cent, from a loss of $2.4 billion, or $6.79, a year earlier. Revenue declined 2.7%. The operating margin extended from 0.7% to 12%. Huntington trades at a price-to-projected-earnings ratio of 13 and a price-to-cash-flow ratio of 11, on par with its regional bank peer group.

2. Akamai Technologies ( AKAM) provides services to accelerate the delivery of content and applications on the Internet. First-quarter profit expanded 10% to $41 million, or 22 cents, as revenue grew 14%. The operating margin inched up from 27% to 28%. Akamai sells for a price-to-book ratio of 3.9, a 28% discount to the Internet software peer average. Its PEG ratio of 0.6 indicates a 40% discount to estimated fair value.

1. Utah-based Zions Bancorporation ( ZION) has surged 70% in 2010 and has doubled over a one-year span. Its first-quarter loss narrowed 93% to $60 million, or 57 cents, as revenue jumped 36%. The operating margin remained in negative territory. Zions trades at a price-to-book ratio of 0.6 and a price-to-cash-flow ratio of 2.1, 50% and 79% discounts to industry averages. The shares are expensive based on projected earnings.

-- Reported by Jake Lynch in Boston.

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