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NEW YORK ( TheStreet) -- Aetna (NYSE: AET) hit a new 52-week high Thursday as it is currently trading at $48.97, above its previous 52-week high of $47.71 with 2.7 million shares traded as of 10 a.m. ET. Average volume has been 3.4 million shares over the past 30 days. Aetna has a market cap of $15.5 billion and is part of the health care sector and health services industry. Shares are up 10.3% year to date as of the close of trading on Wednesday. Aetna Inc. operates as a diversified health care benefits company in the United States. The company operates in three segments: Health Care, Group Insurance, and Large Case Pensions. The company has a P/E ratio of nine, equal to the average health services industry P/E ratio and below the S&P 500 P/E ratio of 17.7.