Did Bittrex operate a National Securities Exchange?

Could you please clarify if Bittrex, a renowned cryptocurrency exchange platform, was ever involved in the operation of a National Securities Exchange? This question arises due to the distinct nature of securities exchanges, which are typically regulated by stringent financial authorities and have a different scope of operations compared to cryptocurrency exchanges. It would be insightful to understand if Bittrex ventured into this realm or if there's any misconception surrounding its business model.