Todd Peters, senior vice president at Adviser Investments, has the market analysis for Wednesday, March 27. After initial advances, all major U.S. stockA financial instrument giving the holder a proportion of the ownership and earnings of a company. market indexes closed the day down: The Dow Jones Industrial Average, S&P 500 and NASDAQ dropped 0.1%, 0.5% and 0.6% , respectively. Meanwhile, health insurer Centene made headlines with its announced $15 billion purchase of rival WellCare Health Plans, and CVS’ stock fell 1.8% in response to the acquisition news. In addition, 10-year Treasury bondA financial instrument representing an IOU from the borrower to the lender. Bond issuers promise to pay bond holders a given amount of interest for a pre-determined amount of time until the loan is repaid in full (otherwise known as the maturity date). Bonds can have a fixed or floating interest rate. Fixed-rate bonds pay out a pre-determined amount of interest each year, while floating-rate bonds can pay higher or lower interest each year depending on prevailing market interest rates.yieldsYield is a measure of the income on an investment in relation to the price. There are several ways to measure yield. The current yield of a security is the income over the past year (either dividends or coupon payments) divided by the current price. dipped to the lowest level since December 2017 .