wal-mart shares mexico bribery 2012 4 23

Appears In:

This year's gains in the blue-chip company's share price have been wiped out in a single day.

The $153 billion California State Teachers' Retirement System holds more than 5.3 million shares of Wal-Mart.

A shopping cart at a Wal-Mart store in Los Angeles in seen in November, 2009.

ROBYN BECK

AFP/Getty Images