Sears down on removal from S&P 500 New York

New York -- Shares of Sears Holdings were under heavy selling pressure Thursday morning, sliding 7% to $53.38 on Standard & Poor's. S&P plans to remove the chain from its S&P 500 Index because the chain’s public float has has been below the index's 50% threshold for an extended period of time.

The Sears' name, in one form or another, has been in the S&P 500 since it was created some 55 years ago. Sears will be removed from the index at the close of trading on Sept. 4. The retailer will be replaced by chemical maker LyondellBasell.