Monolithic Power Systems (MPS) is a high performance analog semiconductor company headquartered in San Jose, California. Formed in 1997, the company has three core strengths; deep system-level and applications knowledge, strong analog design expertise, and an innovative proprietary process technology. These combined advantages enable MPS to deliver highly integrated monolithic products that offer energy efficient, cost-effective solutions.
MPS is a fables semiconductor company, working with third party foundries. However, in contrast to many other fables companies that use standard process technologies, MPS works with its foundry partners to install its own proprietary process technology in their facilities for use solely by MPS.
http://www.monolithicpower.com/default.aspx

Holtek Semiconductor is a leading professional IC design house in Taiwan having its major business activities focused in the area of microcontroller and peripheral component design and marketing. From its origins in 1998, the company has continuously focused its energies in the advancement of new product development and skills innovation. The company’s ability to keep in line with market trends, has given Holtek the means of releasing a wide range of highly successful and extremely competitive IC devices.
http://www.holtek.com.tw/en/numindex

Nisshinbo Micro Device Inc. is a high performance analog semiconductor company headquartered in Tokio, Japan. The company is focused on development and production of high quality OPAmps, Power Management IC, audio and RF device. Using bipolar, CMOS and BCD technology Nisshinbo provides a wide range of products for consumer as well for industrial and automotive application.
Using own factories and technology they can commit for long term supply and also customer made device with high quality standards.
https://www.nisshinbo-microdevices.co.jp/en/

Elite Semiconductor Memory Technology Inc.(ESMT),is a Taiwan based memory IC design company ESMT is a fables manufacturer and have a wide product range of (16Mb up to 2Gb) DRAM products. A number of SPI and and NandFlash up to 4Gb complete the product range. Main applications are communication devices, consumer and industry market.
http://www.esmt.com.tw/english/main_products.asp