The glitch, which occurred on Tuesday, impacted stocks of major companies including 3M (MMM.N), Wells Fargo & Co (WFC.N) and Verizon Communications Inc (VZ.N).
The NYSE, owned by Intercontinental Exchange Inc (ICE.N), said it began trading in 2,824 securities without an opening auction, which led to erroneous prices, with nearly 4,341 trades in 251 securities "busted", or nullified.
The exchange also said it had erroneously triggered a sell short restriction (SSR) on about 80 securities on Tuesday.
That could potentially lead to volatile trading on Wednesday but it was "nothing investors have to worry about", Stovall added.
Reporting by Niket Nishant and Johann M Cherian in Bengaluru; Editing by Anil D'SilvaOur Standards: The Thomson Reuters Trust Principles.