Couple of things first
1. As I understand MarkIt and S3 collect short data through feeds from brokerages. To the extent they don’t have data, they use algorithms to project based on known data.
2. MarkIt/S3 data doesn’t precisely match with exchange data for the days the exchange reports. However the trends generally are in line. If exchange shows say short-interest is down 2mil, MarkIt/S3 also shows roughly 2mli down for same period. So to evaluate ‘trends’ in shorting MarkIt/S3 is still useful.
3. Markit and S3 generally agree with each other in trends but don’t necessarily agree with each other precisely on a day to day basis.
4. Exchange reports based on settlement, but I believe MarkIt/S3 report based on trades.
I don’t want to steal any thunder from Ihor, so I won’t post S3.
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For reference latest exchange reported short-interest is 31.692 Mil, which I believe is for trade date 5/10. The above table shows it roughly inline but not precisely.
Actually I just noticed that Shorts are basically keeping the aggregate position under $10Bil. They can't seem to be able to afford more than that size.
This is inline with what Mark BS has been posting himself. He is trimming his short as the stock is going up. Trying to keep the size under a certain limit.
So forced buying is very real. As stock keeps going up, they keep covering (buying) adding more fuel to the momentum.
They seem to have gotten themselves into a trap.