Royal Dutch Shell as its name implies consists of the RDS.A (Dutch side) and RDS.B (British side).
For a long time RDS.B sells at a slight premium to RDS.A as the British does not tax the dividend while the Dutch taxes the dividend at 15% rate.
Come January 2020 the Dutch phased out the tax on dividend but RDS.B still traded at a premium. By February slowly both are traded about the same price, sometime RDS.A is higher or RDS.B is higher but they both go up and down every day together. Today is totally bonkers.
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