NSCC is providing this notice to its Members to inform them of the planned implementation and effective date of October 2, 2023. Why? IDIOSYNCRATIC RISK!
Remember, VaR tinkers with the mechanics that would have defaulted Robinhood, Instinet, & Others 1/28/21. I believe this is a precursor to MOASS.
Source: https://www.dtcc.com/-/media/Files/pdf/2023/8/25/a9333.pdf
Previous post: MOASS Prediction: October 24, 2023 (a Tuesday):
* The NSCC