Sector 10/4 Industry 10/4
APLD Information Technology IT Services
SITM Information Technology Semiconductors & Semiconductor Equipment
APP Information Technology Software
IREN Information Technology Software

looks like what Fidelity uses

Sector & Industry
The market segment to which a company belongs, as determined by S&P Capital IQ. S&P Capital IQ uses the Global Industry Classification Standard (GICS)SM, an industry classification system developed by S&P Capital IQ in collaboration with Morgan Stanley Capital International (MSCI).

GICS is currently comprised of:

11 Sectors. See definitions of each sector
69 Industries. See definitions of each sector

A company is assigned to a single GICS sub-industry according to the definition of its principal business activity as determined by S&P Capital IQ and MSCI. Revenues are a significant factor in defining principal business activity; however, earnings analysis and market perception are also important criteria for classification.

GICS was developed in response to the financial community's need for one complete, consistent set of global sector and industry definitions. The GICS standard can be applied to companies globally, in both developed and developing markets, and currently comprises a universe of over 40,000 companies worldwide.

S&P Capital IQ has assigned each company in the stock search database to one of 11 sectors.