It could also just be them adhering to industry standards. When the VIX rises, portfolio risk goes up across the board for everyone automatically. Institutions draw down positions overall (but cut more from their losers than their winners) and then begin scoping out shorter term trading opportunities, as opposed to strictly investing. I'm seeing a 15.1% increase in the volatility index today alone. Since these transactions took place on May 5th and 6th, looking back we can see that a sharp rise in the VIX began at the tail end of May 4th.
I think it's literally just them adhering to protocol.
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