US stocks mixed; Greece elections eyed By: CNBC.com News December 29, 2014 at 09:36 AM EST U.S. stocks opened slightly lower, amid some pressure on European stocks from Greece's failure to elect a president in a third round of elections. Read More >> Related Stocks: Allianz Se ADR Repstg 1/10 Sh Capital A Berhad Sentinelone Inc Cl A Verizon Communications