The NYSE, which is owned by Intercontinental Exchange Inc (ICE.N), said it was still investigating and that traders may want to consider filing for erroneous trade claims.
"Obviously, there were a lot of stocks that had major issues," said Joe Saluzzi, co-manager of trading at Themis Trading in Chatham, New Jersey.
Saluzzi said there was "zero failure tolerance" among traders for glitches at the key open and close of trading.
The NYSE-listed stocks trade on all 16 U.S. stock exchanges, which use the NYSE's prices.
In March 2018, the NYSE was the first exchange fined under Reg SCI.