Look out below...
The Bloomberg Massachusetts stock index has sunk 11.1 percent since the stock market hit its summer top on July 17, slightly less than the 11.3 percent decline in the Standard & Poor's 500 over the same period.
Among Massachusetts company with a minimum stock market value of $500 million, the 10 biggest losers (as of mid-session today) were: Akamai Technologies Inc. (down 42.7 percent), Sonus Networks Inc., (down 34 percent), Perini Corp. (down 35.4 percent), Sepracor Inc. (down 32.2 percent), Brooks Automation Inc., Beacon Roofing Supply Inc. (29.4 percent), 3Com Corp. (down 26.2 percent), VistaPrint Ltd. (down 25 percent), Palomar Medical Technologies Inc. (down 24.7 percent), BJ's Wholesale Club (down 24.3 percent).
A total of 42 Massachusetts companies of any size have managed to hold their ground in the stock market or actually gain in value. The best of the group: Vertex Pharmaceuticals Inc., which has climbed 18.4 percent.
