shares of verisign inc vrsn slid 051 to 21260 wednesday on what proved to be an allaround grim trading session for the stock market with the sp 500 index spx falling 041 to 409195 and dow jones industrial average djia falling 011 to 3364650 verisign inc closed 1196 short of its 52week high 22456 which the company achieved on february 2nd the stock underperformed when compared to some of its competitors wednesday as equinix inc eqix rose 064 to 71104 zscaler inc zs fell 008 to 10587