Unusual total active option classes on open include: CSOP FTSE China A50 ETF (AFTY), Tellurian (TELL), Livent Corp (ALTM), ACM Research (ACMR), EHang Holdings Ltd (EH), Mini SPX (.XSP), iQiyi (IQ), Spirit Airlines (SAVE), Pfizer (PFE), and iShares DJ US Real Estate Index Fund (IYR).