π± CBOE ΠΎΡΠΎΠ·Π²Π°Π»ΠΈ Π·Π°ΡΠ²ΠΊΡ Π±ΠΈΡΠΊΠΎΠΈΠ½ ETF ΠΈΠ· SEC.https://www.sec.gov/rules/sro/cboebzx/2019/34-84988.pdf