Viking Global Investors LP just filed a "Statement of acquisition of beneficial ownership", which is also known as a 13G. In the filing, it appears as though Viking Global Investors LP claims to own 5,398,933 shares. This represents 5.3% of Laboratory Corporation of America Holdings.
Please note that typos are common in SEC filings. Please verify the information reported above before acting on it.
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Other recent filings from the company include the following: