On April 11, the Financial Industry Regulatory Authority filed with the Securities and Exchange Commission a proposed rule change to adopt FINRA Rules 6190 (Compliance with Regulation NMS Plan to Address Extraordinary Market Volatility) and 6121.01 (Resumption of Trading in Securities Subject to the Regulation NMS Plan to Address Extraordinary Market Volatility), which implement the Plan to Address Extraordinary Market Volatility Pursuant to Rule 608 of Regulation NMS (Limit Up-Limit Down Plan), on a permanent basis, consistent with the recent approval of the Limit Up-Limit Down Plan to operate on a permanent basis. The rule change was effective upon filing.

The text of the rule change is available here.