NEW YORK (TheStreet) -- If you're looking for stocks to buy that have been volatile during this strange trading period (read, good opportunities for savvy investors), that offer high returns and spend their capital efficiently, take a look at these stocks.

Total return is measured by the historical price movement of the stock. Efficiency is measured by the strength and historic growth of a company's return on invested capital.

Here are 8 stocks with 'A' ratings, which offer both from TheStreet Quant RatingsTheStreet's proprietary quant-based stock-rating tool.

The Street Quant Ratings rates every one of these stocks an A, as well as a five-star rating on total return, volatility, and efficiency. These stocks were chosen from 4,300 different types of equities we rate.

TheStreet Ratings projects a stock's total return potential over a 12-month period including both price appreciation and dividends. Based on 32 major data points, TheStreet Ratings uses a quantitative approach to rating over 4,300 stocks to predict return potential for the next year. The model is both objective, using elements such as volatility of past operating revenues, financial strength, and company cash flows, and subjective, including expected equities market returns, future interest rates, implied industry outlook and forecasted company earnings.

Buying an S&P 500 stock that TheStreet Ratings rated a buy yielded a 16.56% return in 2014, beating the S&P 500 Total Return Index by 304 basis points. Buying a Russell 2000 stock that TheStreet Ratings rated a buy yielded a 9.5% return in 2014, beating the Russell 2000 index, including dividends reinvested, by 460 basis points last year.

Check out which stocks made the list. And when you're done, be sure to read about which safe, A+ rated stocks you should buy now. Year-to-date returns are based on September 17, 2015 prices as of 11:57am.

RLI Chart

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8. RLI Corp. (RLI - Get Report)
Rating: Buy, A
Market Cap: $2.4 billion
Year-to-date return: 13%

RLI Corp., through its subsidiaries, underwrites property and casualty insurance primarily in the United States.

TheStreet Ratings team rates RLI CORP as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate RLI CORP (RLI) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its increase in net income, largely solid financial position with reasonable debt levels by most measures, notable return on equity, good cash flow from operations and solid stock price performance. We feel its strengths outweigh the fact that the company is trading at a premium valuation based on our review of its current price compared to such things as earnings and book value."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The net income growth from the same quarter one year ago has exceeded that of the S&P 500 and the Insurance industry average. The net income increased by 4.1% when compared to the same quarter one year prior, going from $35.73 million to $37.19 million.
  • RLI's debt-to-equity ratio is very low at 0.17 and is currently below that of the industry average, implying that there has been very successful management of debt levels.
  • The return on equity has improved slightly when compared to the same quarter one year prior. This can be construed as a modest strength in the organization. Compared to other companies in the Insurance industry and the overall market, RLI CORP's return on equity exceeds that of both the industry average and the S&P 500.
  • Net operating cash flow has increased to $47.71 million or 17.71% when compared to the same quarter last year. In addition, RLI CORP has also vastly surpassed the industry average cash flow growth rate of -46.59%.
  • The stock has not only risen over the past year, it has done so at a faster pace than the S&P 500, reflecting the earnings growth and other positive factors similar to those we have cited here. The stock's price rise over the last year has driven it to a level which is somewhat expensive compared to the rest of its industry. We feel, however, that other strengths this company displays justify these higher price levels.
  • You can view the full analysis from the report here: RLI
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TXRH Chart

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7. Texas Roadhouse, Inc. (TXRH - Get Report)
Rating: Buy, A
Market Cap: $2.6 billion
Year-to-date return: 11.7%

Texas Roadhouse, Inc., together with its subsidiaries, operates as a full-service restaurant company. The company operates its restaurants primarily under the Texas Roadhouse name.

TheStreet Ratings team rates TEXAS ROADHOUSE INC as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate TEXAS ROADHOUSE INC (TXRH) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its revenue growth, solid stock price performance, good cash flow from operations and largely solid financial position with reasonable debt levels by most measures. We feel its strengths outweigh the fact that the company shows low profit margins."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The revenue growth came in higher than the industry average of 4.0%. Since the same quarter one year prior, revenues rose by 15.0%. This growth in revenue does not appear to have trickled down to the company's bottom line, displayed by a decline in earnings per share.
  • Compared to its closing price of one year ago, TXRH's share price has jumped by 37.55%, exceeding the performance of the broader market during that same time frame. Regarding the stock's future course, although almost any stock can fall in a broad market decline, TXRH should continue to move higher despite the fact that it has already enjoyed a very nice gain in the past year.
  • Net operating cash flow has slightly increased to $37.13 million or 3.92% when compared to the same quarter last year. The firm also exceeded the industry average cash flow growth rate of -7.80%.
  • TEXAS ROADHOUSE INC's earnings per share declined by 9.1% in the most recent quarter compared to the same quarter a year ago. This company has reported somewhat volatile earnings recently. But, we feel it is poised for EPS growth in the coming year. During the past fiscal year, TEXAS ROADHOUSE INC increased its bottom line by earning $1.23 versus $1.13 in the prior year. This year, the market expects an improvement in earnings ($1.38 versus $1.23).
  • TXRH's debt-to-equity ratio is very low at 0.08 and is currently below that of the industry average, implying that there has been very successful management of debt levels. Even though the company has a strong debt-to-equity ratio, the quick ratio of 0.45 is very weak and demonstrates a lack of ability to pay short-term obligations.
  • You can view the full analysis from the report here: TXRH
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CBOE Chart

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6. CBOE Holdings, Inc. (CBOE - Get Report)
Rating: Buy, A
Market Cap: $5.5 billion
Year-to-date return: 5.3%

CBOE Holdings, Inc., through its subsidiaries, operates as an options exchange and creator of listed options in the United States.

TheStreet Ratings team rates CBOE HOLDINGS INC as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate CBOE HOLDINGS INC (CBOE) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, notable return on equity, reasonable valuation levels and expanding profit margins. We feel its strengths outweigh the fact that the company shows weak operating cash flow."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • CBOE's revenue growth has slightly outpaced the industry average of 3.2%. Since the same quarter one year prior, revenues slightly increased by 3.3%. This growth in revenue appears to have trickled down to the company's bottom line, improving the earnings per share.
  • CBOE has no debt to speak of therefore resulting in a debt-to-equity ratio of zero, which we consider to be a relatively favorable sign. Along with this, the company maintains a quick ratio of 2.54, which clearly demonstrates the ability to cover short-term cash needs.
  • The company's current return on equity greatly increased when compared to its ROE from the same quarter one year prior. This is a signal of significant strength within the corporation. Compared to other companies in the Diversified Financial Services industry and the overall market, CBOE HOLDINGS INC's return on equity significantly exceeds that of both the industry average and the S&P 500.
  • The gross profit margin for CBOE HOLDINGS INC is rather high; currently it is at 56.91%. It has increased from the same quarter the previous year. Along with this, the net profit margin of 30.15% significantly outperformed against the industry average.
  • You can view the full analysis from the report here: CBOE
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CDNS Chart

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5. Cadence Design Systems, Inc. (CDNS - Get Report)
Rating: Buy, A
Market Cap: $6.2 billion
Year-to-date return: 11.7%

Cadence Design Systems, Inc.

TheStreet Ratings team rates CADENCE DESIGN SYSTEMS INC as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate CADENCE DESIGN SYSTEMS INC (CDNS) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its revenue growth, largely solid financial position with reasonable debt levels by most measures, notable return on equity, reasonable valuation levels and expanding profit margins. Although no company is perfect, currently we do not see any significant weaknesses which are likely to detract from the generally positive outlook. "

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The revenue growth came in higher than the industry average of 11.6%. Since the same quarter one year prior, revenues slightly increased by 9.8%. Growth in the company's revenue appears to have helped boost the earnings per share.
  • CDNS's debt-to-equity ratio is very low at 0.25 and is currently below that of the industry average, implying that there has been very successful management of debt levels. To add to this, CDNS has a quick ratio of 1.66, which demonstrates the ability of the company to cover short-term liquidity needs.
  • The return on equity has improved slightly when compared to the same quarter one year prior. This can be construed as a modest strength in the organization. Compared to other companies in the Software industry and the overall market, CADENCE DESIGN SYSTEMS INC's return on equity exceeds that of both the industry average and the S&P 500.
  • The gross profit margin for CADENCE DESIGN SYSTEMS INC is currently very high, coming in at 93.18%. It has increased from the same quarter the previous year.
  • You can view the full analysis from the report here: CDNS
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ROL Chart

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4. Rollins, Inc. (ROL - Get Report)
Rating: Buy, A
Market Cap: $6.3 billion
Year-to-date return: -12.6%

Rollins, Inc., through its subsidiaries, provides pest and termite control services to residential and commercial customers.

TheStreet Ratings team rates ROLLINS INC as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate ROLLINS INC (ROL) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its revenue growth, growth in earnings per share, increase in net income, notable return on equity and expanding profit margins. We feel its strengths outweigh the fact that the company is trading at a premium valuation based on our review of its current price compared to such things as earnings and book value."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The revenue growth came in higher than the industry average of 5.2%. Since the same quarter one year prior, revenues slightly increased by 6.2%. This growth in revenue appears to have trickled down to the company's bottom line, improving the earnings per share.
  • ROLLINS INC has improved earnings per share by 12.5% in the most recent quarter compared to the same quarter a year ago. The company has demonstrated a pattern of positive earnings per share growth over the past two years. We feel that this trend should continue. During the past fiscal year, ROLLINS INC increased its bottom line by earning $0.63 versus $0.57 in the prior year. This year, the market expects an improvement in earnings ($0.71 versus $0.63).
  • The net income growth from the same quarter one year ago has significantly exceeded that of the S&P 500 and the Commercial Services & Supplies industry. The net income increased by 10.3% when compared to the same quarter one year prior, going from $40.86 million to $45.07 million.
  • The return on equity has improved slightly when compared to the same quarter one year prior. This can be construed as a modest strength in the organization. Compared to other companies in the Commercial Services & Supplies industry and the overall market, ROLLINS INC's return on equity significantly exceeds that of both the industry average and the S&P 500.
  • The gross profit margin for ROLLINS INC is rather high; currently it is at 51.50%. It has increased from the same quarter the previous year. Along with this, the net profit margin of 11.49% is above that of the industry average.
  • You can view the full analysis from the report here: ROL
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ORLY Chart

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3. O'Reilly Automotive, Inc. (ORLY - Get Report)
Rating: Buy, A
Market Cap: $25.2 billion
Year-to-date return: 31.8%

O'Reilly Automotive, Inc., together with its subsidiaries, engages in the retail of automotive aftermarket parts, tools, supplies, equipment, and accessories in the United States.

TheStreet Ratings team rates O'REILLY AUTOMOTIVE INC as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate O'REILLY AUTOMOTIVE INC (ORLY) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its impressive record of earnings per share growth, increase in net income, revenue growth, notable return on equity and expanding profit margins. We feel its strengths outweigh the fact that the company is trading at a premium valuation based on our review of its current price compared to such things as earnings and book value."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • O'REILLY AUTOMOTIVE INC has improved earnings per share by 19.9% in the most recent quarter compared to the same quarter a year ago. The company has demonstrated a pattern of positive earnings per share growth over the past two years. We feel that this trend should continue. During the past fiscal year, O'REILLY AUTOMOTIVE INC increased its bottom line by earning $7.34 versus $6.03 in the prior year. This year, the market expects an improvement in earnings ($8.93 versus $7.34).
  • The net income growth from the same quarter one year ago has greatly exceeded that of the S&P 500, but is less than that of the Specialty Retail industry average. The net income increased by 13.5% when compared to the same quarter one year prior, going from $205.65 million to $233.51 million.
  • Despite its growing revenue, the company underperformed as compared with the industry average of 10.6%. Since the same quarter one year prior, revenues rose by 10.2%. Growth in the company's revenue appears to have helped boost the earnings per share.
  • Current return on equity exceeded its ROE from the same quarter one year prior. This is a clear sign of strength within the company. When compared to other companies in the Specialty Retail industry and the overall market, O'REILLY AUTOMOTIVE INC's return on equity exceeds that of the industry average and significantly exceeds that of the S&P 500.
  • The gross profit margin for O'REILLY AUTOMOTIVE INC is rather high; currently it is at 54.52%. It has increased from the same quarter the previous year. Along with this, the net profit margin of 11.47% is above that of the industry average.
  • You can view the full analysis from the report here: ORLY
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LMT Chart

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2. Lockheed Martin Corporation (LMT - Get Report)
Rating: Buy, A
Market Cap: $64.9 billion
Year-to-date return: 8.5%

Lockheed Martin Corporation, a security and aerospace company, engages in the research, design, development, manufacture, integration, and sustainment of technology systems, products, and services.

TheStreet Ratings team rates LOCKHEED MARTIN CORP as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate LOCKHEED MARTIN CORP (LMT) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its solid stock price performance, growth in earnings per share, increase in net income, revenue growth and notable return on equity. We feel its strengths outweigh the fact that the company has had generally high debt management risk by most measures that we evaluated."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The stock has not only risen over the past year, it has done so at a faster pace than the S&P 500, reflecting the earnings growth and other positive factors similar to those we have cited here. Turning our attention to the future direction of the stock, it goes without saying that even the best stocks can fall in an overall down market. However, in any other environment, this stock still has good upside potential despite the fact that it has already risen in the past year.
  • LOCKHEED MARTIN CORP has improved earnings per share by 6.5% in the most recent quarter compared to the same quarter a year ago. The company has demonstrated a pattern of positive earnings per share growth over the past two years. We feel that this trend should continue. During the past fiscal year, LOCKHEED MARTIN CORP increased its bottom line by earning $11.21 versus $9.04 in the prior year. This year, the market expects an improvement in earnings ($11.40 versus $11.21).
  • The net income growth from the same quarter one year ago has exceeded that of the S&P 500 and the Aerospace & Defense industry average. The net income increased by 4.5% when compared to the same quarter one year prior, going from $889.00 million to $929.00 million.
  • Despite its growing revenue, the company underperformed as compared with the industry average of 5.0%. Since the same quarter one year prior, revenues slightly increased by 3.0%. Growth in the company's revenue appears to have helped boost the earnings per share.
  • The company's current return on equity greatly increased when compared to its ROE from the same quarter one year prior. This is a signal of significant strength within the corporation. Compared to other companies in the Aerospace & Defense industry and the overall market, LOCKHEED MARTIN CORP's return on equity significantly exceeds that of both the industry average and the S&P 500.
  • You can view the full analysis from the report here: LMT
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SBUX Chart

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1. Starbucks Corporation (SBUX - Get Report)
Rating: Buy, A
Market Cap: $85.4 billion
Year-to-date return: 40.2%

Starbucks Corporation operates as a roaster, marketer, and retailer of specialty coffee worldwide. The company operates in four segments: Americas; Europe, Middle East, and Africa; China/Asia Pacific; and Channel Development.

TheStreet Ratings team rates STARBUCKS CORP as a Buy with a ratings score of A. TheStreet Ratings Team has this to say about their recommendation:

"We rate STARBUCKS CORP (SBUX) a BUY. This is based on the convergence of positive investment measures, which should help this stock outperform the majority of stocks that we rate. The company's strengths can be seen in multiple areas, such as its revenue growth, solid stock price performance, impressive record of earnings per share growth, compelling growth in net income and notable return on equity. We feel its strengths outweigh the fact that the company shows weak operating cash flow."

Highlights from the analysis by TheStreet Ratings Team goes as follows:

  • The revenue growth came in higher than the industry average of 4.0%. Since the same quarter one year prior, revenues rose by 17.5%. This growth in revenue appears to have trickled down to the company's bottom line, improving the earnings per share.
  • Investors have apparently begun to recognize positive factors similar to those we have mentioned in this report, including earnings growth. This has helped drive up the company's shares by a sharp 43.44% over the past year, a rise that has exceeded that of the S&P 500 Index. Turning to the future, naturally, any stock can fall in a major bear market. However, in almost any other environment, the stock should continue to move higher despite the fact that it has already enjoyed nice gains in the past year.
  • STARBUCKS CORP has improved earnings per share by 22.4% in the most recent quarter compared to the same quarter a year ago. The company has demonstrated a pattern of positive earnings per share growth over the past two years. We feel that this trend should continue. During the past fiscal year, STARBUCKS CORP turned its bottom line around by earning $1.36 versus -$0.01 in the prior year. This year, the market expects an improvement in earnings ($1.58 versus $1.36).
  • The net income growth from the same quarter one year ago has significantly exceeded that of the S&P 500 and the Hotels, Restaurants & Leisure industry. The net income increased by 22.2% when compared to the same quarter one year prior, going from $512.70 million to $626.60 million.
  • The company's current return on equity greatly increased when compared to its ROE from the same quarter one year prior. This is a signal of significant strength within the corporation. Compared to other companies in the Hotels, Restaurants & Leisure industry and the overall market, STARBUCKS CORP's return on equity significantly exceeds that of both the industry average and the S&P 500.
  • You can view the full analysis from the report here: SBUX
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