Tacoma, Wash. — Circuit City, Rex Stores and PC Mall have been added to the Russell 2000 small-capitalization stock index.

Rex, the multi-regional brown- and white-goods chain, and PC Mall, a direct-sale computer dealer, are new to the index.

Circuit City, whose share price has plunged in recent months, was moved from the large-cap Russell 1000 index.

The indices are developed by Russell Investments, which adds and removes constituent stocks once a year to mirror various market segments.