Why Illumina Stock Mashed the Market on Monday

Gene-sequencing stock Illumina (ILMN 2.98%) was a standout in the biotech sector Monday, with its share-price rise convincingly beating the S&P 500 index. Investors were cheered by a stock buy made by a high-profile insider. As a result, its shares closed the day almost 3% higher, while the bellwether index slid by almost 0.4%.The CEO snapped up some sharesThe insider doing the buying was none other than Illumina's CEO Jacob Thaysen. According to a regulatory document filed on Monday, Thaysen made three sto ...