Alex Longley, Jack Farchi and Catherine Ngai, Bloomberg, write about market participants changing pricing models to account for negative oil prices, here…
“The bid-ask spread on $20 puts for June WTI was nearly $3 at various times on Tuesday, compared with just 15 cents last week. Several traders and brokers said that they were being quoted bid-ask spreads that were many times wider than normal.
CME Group Inc. said late Tuesday that the clearing house will switch the options pricing and valuation model to Bachelier — a model named after the famous French mathematician — to accommodate negative prices in the underlying futures and allow for listing of options contracts with negative strikes for a certain set of crude oil and energy products. The change is effective Wednesday and will remain in place until further notice.

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