Subject: A to B ratio
The A-to-B ratio was pretty constantly only a hair above 1500 to 1 for pretty much all of 2019 and 2020. Also the first half of last year.
But about a year ago the ratio starting climbing pretty steadily, with figures now averaging over 1520 normal and stretches over 1530.

It's not all that important, but one wonders what the reason is.
One speculation:
The recent popularity of fractional share ownership has caused a lot of people to buy a fraction of an A share rather than plumping for B shares as they would have before.
Thus that tranche of incremental demand from people who never owned Berkshire before is going to A, not B.

Anyone have a better guess?

A graph of the ratio (only at close, not the best measure) in the last year and a half.
https://stockcharts.com/h-sc/u...

The way to measure the ratio a bit more accurately is to take the ratio of midpoint of bid/ask for each class while the market is open.

Jim