AMREP, through its subsidiaries, is engaged in the real estate business. The company conducts its real estate business primarily in the City of Rio Rancho and certain adjoining areas of Sandoval County, NM. The company sells both developed and undeveloped lots to national, regional and local homebuilders, commercial and industrial property developers and others. The company also acquires land, focusing primarily in New Mexico, after completion of market research, soil tests, environmental studies and other engineering work, a review of zoning and other governmental requirements, discussions with homebuilders or other end-users of the property and financial analysis of the project and estimated development costs.

Charles & Colvard manufactures, markets, and distributes Charles & Colvard Created Moissanite? (which the company refers to as moissanite or moissanite jewels) and finished jewelry featuring its proprietary moissanite gemstone for sale in the worldwide jewelry market. The company sells loose moissanite jewels and finished jewelry through various operating segments: its Online Channels segment, which comprises its charlesandcolvard.com website, e-commerce outlets, including marketplaces, drop-ship customers, and other e-commerce customers; and its Traditional segment, which consists of domestic and international distributors and retail customers.

Pulse Biosciences is a bioelectric medicine company. The company is pursuing regulatory clearance to market CellFX? System (CellFX). The CellFX System utilizes its Nano-Pulse Stimulation? (NPS) technology to treat various applications for which an optimal solution remains unfulfilled. NPS is a proprietary technology that delivers nanosecond duration pulses of high amplitude electrical energy to non-thermally clear targeted cells while sparing adjacent non-cellular tissue. The company's CellFX System allows for the adjustment of four key treatment parameters: pulse duration, pulse amplitude, pulse frequency, and the number of pulses, depending on the target tissue, application and desired treatment outcome.

Universal Electronics develops control and sensor technology solutions and manufactures a line of pre-programmed and universal remote control products, audio-video accessories, and intelligent wireless security and smart home products. The company provides subscription broadcasting providers with its universal remote control devices and integrated circuits, on which its software and device code libraries are embedded. The company also sells integrated circuits, on which its software and device control code libraries are embedded, and licenses its device control database to original equipment manufacturers that manufacture televisions, digital audio and video players, streamer boxes, among others.