You’ll soon be able to get a DNA test for $100 — here’s the company behind the breakthrough By: MarketWatch November 30, 2018 at 12:20 PM EST San Diego-based Illumina has a 90% market share and dominates all competitors. Read More >> Related Stocks: Alphabet-A Alphabet-C Apple Bristol-Myers Squibb Illumina Inc Roche Holding AG Basel American Depositary Shares Thermo Fisher Scientific