Market Value 50

Ranked by market capitalization on March 31, 2009

2009 rank	2008 rank	Company	Market value (billions)	Change (%)
1	2	EMC Corp.	$22,942.2	-23.8
2	5	Genzyme Corp.	$16,115.7	-19.2
3	7	Biogen IDEC	$15,582.0	-15.2
4	3	Raytheon Co.	$15,580.6	-43.4
5	4	Thermo Fisher Scientific	$14,915.9	-37.3
6	1	State Street Corp.	$13,347.2	-56.7
7	9	Staples	$12,946.1	-16.5
8	8	American Tower Corp.	$12,088.1	-22.1
9	6	Boston Scientific Corp.	$11,972.5	-37.8
10	10	TJX Cos.	$10,675.0	-24.6
11	12	Analog Devices	$5,612.0	-35.3
12	22	Vertex Pharmaceuticals	$4,660.0	40.5
13	15	Iron Mountain	$4,476.8	-15.6
14	11	Boston Properties	$4,247.9	-61.4
15	14	Waters Corp.	$3,586.0	-35.6
16	24	NStar	$3,405.0	4.8
17	13	Hologic	$3,358.2	-52.7
18	17	Akamai Technologies	$3,307.6	-29.7
19	19	Millipore Corp.	$3,181.5	-14.3
20	20	Nuance Communications	$2,852.9	-21.6
21	21	Eaton Vance Corp.	$2,661.4	-24.3
22	27	Interactive Data Corp.	$2,327.3	-13.2
23	29	Inverness Medical Innovations	$2,093.8	-10.2
24	18	Charles River Laboratories International	$1,817.4	-54.8
25	35	BJ's Wholesale Club	$1,750.0	-17.8
26	23	Affiliated Managers Group	$1,712.9	-48.2
27	30	Senior Housing Properties Trust	$1,688.0	-25.0
28	32	Sepracor	$1,600.4	-26.8
29	36	Varian Semiconductor Equipment	$1,582.0	-25.4
30	26	PerkinElmer	$1,483.6	-48.0
31	37	Hanover Insurance Group	$1,473.7	-30.5
32	31	Novell	$1,467.2	-33.8
33	42	Haemonetics Corp.	$1,400.8	-7.5
34	47	Skyworks Solutions	$1,345.0	14.0
35	-	3Com Corp.	$1,195.1	29.7
36	40	VistaPrint Ltd.	$1,158.4	-24.7
37	38	Parametric Technology Corp.	$1,153.5	-37.8
38	46	Alkermes	$1,146.3	-3.2
39	44	Clean Harbors	$1,140.0	-14.0
40	25	Hospitality Properties Trust	$1,127.9	-64.7
41	-	Starent Networks Corp.	$1,110.7	18.7
42	28	Bruker Corp.	$1,010.6	-59.8
43	-	Cubist Pharmaceuticals	$941.5	-9.1
44	48	Hittite Microwave Corp.	$936.6	-19.5
45	-	Franklin Street Properties	$866.9	-14.1
46	-	athenahealth	$805.7	5.2
47	-	Alnylam Pharmaceuticals	$788.7	-20.8
48	-	Sycamore Networks	$758.0	-27.0
49	34	Teradyne	$756.5	-65.1
50	-	American Superconductor Corp.	$749.3	-22.1