All three major indices are trading up today with the Dow Jones Industrial Average ( ^DJI) trading up 95 points (0.6%) at 16,447 as of Thursday, Sept. 3, 2015, 12:55 PM ET. The NYSE advances/declines ratio sits at 2,140 issues advancing vs. 838 declining with 150 unchanged.

The Health Care sector currently sits down 0.4% versus the S&P 500, which is up 0.5%. Top gainers within the sector include Lannett ( LCI), up 13.7%, Grifols ( GRFS), up 3.9%, Anthem ( ANTM), up 2.0%, Cigna ( CI), up 1.7% and AstraZeneca ( AZN), up 1.7%. On the negative front, top decliners within the sector include Catalent ( CTLT), down 8.6%, Intrexon ( XON), down 4.7%, Alnylam Pharmaceuticals ( ALNY), down 3.7%, Incyte ( INCY), down 3.0% and Gilead ( GILD), down 1.6%.

TheStreet would like to highlight 3 stocks pushing the sector higher today:

3. HCA Holdings ( HCA) is one of the companies pushing the Health Care sector higher today. As of noon trading, HCA Holdings is up $1.82 (2.1%) to $87.29 on light volume. Thus far, 1.1 million shares of HCA Holdings exchanged hands as compared to its average daily volume of 3.3 million shares. The stock has ranged in price between $85.74-$88.18 after having opened the day at $86.17 as compared to the previous trading day's close of $85.47.

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HCA Holdings, Inc., through its subsidiaries, provides health care services in the United States. HCA Holdings has a market cap of $35.0 billion and is part of the health services industry. The company has a P/E ratio of 17.3, below the S&P 500 P/E ratio of 24.2. Shares are up 16.5% year-to-date as of the close of trading on Wednesday. Currently there are 18 analysts who rate HCA Holdings a buy, no analysts rate it a sell, and 2 rate it a hold.

TheStreet Ratings rates HCA Holdings as a buy. The company's strengths can be seen in multiple areas, such as its revenue growth, solid stock price performance, growth in earnings per share and increase in net income. We feel its strengths outweigh the fact that the company shows weak operating cash flow. Get the full HCA Holdings Ratings Report now.

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2. As of noon trading, Express Scripts ( ESRX) is up $0.58 (0.7%) to $84.07 on light volume. Thus far, 1.1 million shares of Express Scripts exchanged hands as compared to its average daily volume of 4.3 million shares. The stock has ranged in price between $83.84-$84.99 after having opened the day at $84.08 as compared to the previous trading day's close of $83.49.

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Express Scripts Holding Company operates as a pharmacy benefit management (PBM) company in the United States and Canada. The company operates through two segments, PBM and Other Business Operations. Express Scripts has a market cap of $55.4 billion and is part of the health services industry. The company has a P/E ratio of 27.1, above the S&P 500 P/E ratio of 24.2. Shares are down 1.4% year-to-date as of the close of trading on Wednesday. Currently there are 12 analysts who rate Express Scripts a buy, no analysts rate it a sell, and 9 rate it a hold.

TheStreet Ratings rates Express Scripts as a buy. The company's strengths can be seen in multiple areas, such as its impressive record of earnings per share growth, compelling growth in net income, revenue growth, notable return on equity and good cash flow from operations. We feel its strengths outweigh the fact that the company has had generally high debt management risk by most measures that we evaluated. Get the full Express Scripts Ratings Report now.

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1. As of noon trading, Aetna ( AET) is up $1.89 (1.7%) to $115.45 on light volume. Thus far, 1.1 million shares of Aetna exchanged hands as compared to its average daily volume of 4.0 million shares. The stock has ranged in price between $113.76-$116.55 after having opened the day at $114.43 as compared to the previous trading day's close of $113.56.

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Aetna Inc. operates as a health care benefits company in the United States. It operates through three segments: Health Care, Group Insurance, and Large Case Pensions. Aetna has a market cap of $38.9 billion and is part of the health services industry. The company has a P/E ratio of 16.9, below the S&P 500 P/E ratio of 24.2. Shares are up 27.8% year-to-date as of the close of trading on Wednesday. Currently there are 11 analysts who rate Aetna a buy, no analysts rate it a sell, and 6 rate it a hold.

TheStreet Ratings rates Aetna as a buy. The company's strengths can be seen in multiple areas, such as its solid stock price performance, impressive record of earnings per share growth, increase in net income, revenue growth and notable return on equity. We feel its strengths outweigh the fact that the company shows weak operating cash flow. Get the full Aetna Ratings Report now.

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If you are interested in one of these 3 stocks, ETFs may be of interest. Investors who are bullish on the health care sector could consider Health Care Select Sector SPDR ( XLV) while those bearish on the health care sector could consider ProShares Ultra Short Health Care ( RXD).