The Philadelphia Stock Exchange (Phlx) has filed proposed rule changes with the Securities and Exchange Commission relating to bid/ask differentials and split-price priority in open outcry that would standardize the rules to apply equally to options on equities, options on exchange-traded fund (ETF) shares and index options. Phlx’s Rule 1014(c)(i)(A), which relates to bid/ask differentials, currently refers only to equity options, while Phlx Rule 1014(g)(i)(B), which affords split-price priority in open outcry to orders of 100 contracts or more, applies only to transactions in equity options, including options overlying ETFs. The proposed amendment would specify that these rules apply to all options traded on Phlx, including index options.