Roughly 92 million Microsoft Corp.

(NASDAQ:MSFT) shares are currently sold short — 1.27% of the company's public float — the highest percentage since May 2015 and the largest jump in short interest among the Magnificent Seven, according to S3 Partners data cited by CNBC.

MSFT stock is moving ahead of earnings.

See the chart and price action here.

S3 also flagged that almost no short covering has occurred heading into the report, meaning bearish traders are staying put rather than trimming positions before Wednesday's after-the-bell release.