The CME definitely has some culpability in this...When they started issuing those notices about rolling out testing for negative pricing in CL, they seemed to indicate that negative prices were NOT possible at the time.
Meanwhile, they had limits listed like this on their website...
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This was from their website on April 3rd.
On April 27th, after the CL bloodbath, I checked the same page and the hi/low column was gone., but was still there on QM...
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Now, the limit column is gone on that also, along with other major energy instruments like NG, HO and RB. In fact, I recall getting an advisory notice about NG now potentially going negative, but cannot find it.
What did the CME see, so suddenly before this first-time-ever event, that caused them to rush out this negative-pricing ability? Why did they not clearly state that their low-limit breakers were effectively removed? It is evident that this happened so fast that some software and data-feed providers simply didn't have time to adapt. Very curious.