As has been mentioned any number of times in the past, it is not very meaningful to compare the last A price to the last B price, closing or otherwise.
That's because the A shares don't trade continuously, so there is often a big time lag between the two measurements. You can get a pretty random number.

A much better measure is the midpoint of bid and ask for one, versus the midpoint of bid and ask of the other, while the market is open.
At a few minutes before close today, the ratio was 1534.43, or a premium of around 2.3%.

Not that I disagree with your general conclusion. The premium has been a fair bit higher than the historically usual number lately.
The only explanation that has come up is something obscure related to the rise of fractional share trading, but I really don't know.

Jim

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