SAN FRANCISCO – Wall Street hedge-fund investor David Einhorn was active in the last quarter of 2013, taking new stakes in technology and energy companies, while trimming existing holdings in insurer Aetna , NCR Corp and WPX Energy , according to an SEC filing Friday. Einhorn's Greenlight Capital picked up stakes in Anadarko Petroleum , BP , McDermott Intl. , Micron Technolgy and Take-Two Interactive , according to the latest 13F filing. He trimmed stakes in Aetna, Einstein Noah and WPX Energy, according to the filing.
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