Algorithmic trading order limits set by exchanges with rolling window measurement and economic disincentives for breaches. Exchanges shall set an orders per second limit (X) for algorithmic trading per CTCL ID/ATS User ID within the regulator's maximum, measured over a rolling five second window; exchanges must impose and disclose economic disincentives for breaches and ensure limits match their capacity. The requirement that system audits be performed by auditors empanelled by exchanges is deleted; exchanges must notify members and publish the provisions.