The Vanguard Group just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though The Vanguard Group claims to own 22,278,948 shares. This represents 6.34% of Aetna Inc..
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Other recent filings from the company include the following:
Aetna Inc.'s President just disposed of 15,271 shares - Sept. 20, 2017
Exec. VP of Aetna Inc. just picked up 12,103 shares - Sept. 20, 2017
EVP of Aetna Inc. just disposed of 10,288 shares - Sept. 19, 2017
Aetna Inc.'s President just picked up 15,271 shares - Sept. 14, 2017
EVP of Aetna Inc. just picked up 10,288 shares - Sept. 12, 2017