BSE asked clearing members and custodians to report about their preparedness to comply with the amended prevention of money laundering rules.
The FTSE 100 .FTSE index ended the session down 0.9% at 7,323.98 pts, extending the previous session's losses after three days of gains.
Sebi will defreeze the bank accounts of Anjani Sinha and Joseph Massey which were frozen by the regulator in an alleged insider trading case.
Ten of the 11 major S&P indexes were lower, with the industrial sector's .SPLRCI 0.41 percent fall leading the decliners.
Dow e-minis 1YMc1 were up 10 points, or 0.05 percent, with 29,146 contracts changing hands.