The New York Stock Exchange has suspended trading for the rest of the session Wednesday in Amazon, Booking Holdings and Alphabet due to a "price scale code issue," according to the exchange's website. The stocks were trading normally elsewhere, including on their home exchanges.

The issue appeared to be affecting stocks with prices above $1,000 which trade primarily at the Nasdaq. Booking Holdings (formerly Priceline), Amazon and Alphabet are the three highest priced stocks in the S&P 500 and the only ones with prices that are four digits.

Overall trading volume was in line for the names as activity was normal on their home exchanges and other venues.Trading continued on NYSE's own ARCA and NYSE American systems in the stocks.

The NYSE told CNBC it was looking into the matter.

Earlier Wednesday, NYSE posted a status update calling out an issue with the prices: