The PHLX Semiconductor Sector IndexSM (SOXSM) is a modified market capitalization-weighted index composed of companies primarily involved in the design, distribution, manufacture, and sale of semiconductors.
The Index began on December 1, 1993 at a base value of 200.00 and was split two-for-one on July 24, 1995; options commenced trading on September 7, 1994.