Rule 21f 17 a of the securities exchange act July 8, 2019 16 32 64 128 Rule 21f 17 a under the securities exchange act Rule 21f-17 of the securities exchange act of 1934 Securities act of 1933 Sec rule 21f-17 Exchange act rule 21f-17(a) Section 21(a) of the securities exchange act of 1934