Company

Total Rx/Year

Market Share

Medco Health Solutions, Inc.

695,000,000

18.20%

CVS/Caremark Rx, Inc.

658,500,000

17.25%

Argus Health Systems, Inc.

504,000,000

13.20%

Express Scripts, Inc.

449,300,000

11.77%

Prescription Solutions

274,920,504

7.20%

ACS, Inc.

250,000,000

6.55%

MedImpact Healthcare Systems, Inc.

170,400,000

4.46%

First Health Services Corporation

148,500,000

3.89%

Prime Therapeutics LLC

114,000,000

2.99%

HealthTrans

90,102,300

2.36%

Aetna Pharmacy Management (APM)

89,709,989

2.35%

Walgreens Health Services Division

84,105,927

2.20%

Catalyst Rx

64,879,964

1.70%

CIGNA Pharmacy Management

51,108,000

1.34%

RESTAT, LLC

25,046,964

0.66%

SXC Health Solutions, Inc./informedRx

22,800,000

0.60%

ScriptSave

17,000,000

0.45%

FutureScripts

15,503,019

0.41%

RegenceRx

15,325,432

0.40%

Pharmacy Data Management, Inc. (PDMI)

14,100,000

0.37%

Navitus Health Solutions, LLC

10,500,000

0.28%

National Pharmaceutical Services

10,000,000

0.26%

PerformRx, LLC

9,771,216

0.26%

BioScrip

7,735,710

0.20%

NovoLogix

4,800,000

0.13%

SOURCE: Atlantic Information Services' (AIS) exclusive quarterly survey of pharmacy benefit management companies conducted by Drug Benefit News during the 3rd quarter of 2010.

METHODOLOGY: Survey conducted by AIS researchers and supplemented by publicly available information sources. Survey includes companies that describe themselves as PBMs, pharmacy benefit administrators, specialty pharmacy providers and others providing pharmacy benefit services. Prescriptions=Rx filled via all channels offered by each company, including retail, mail-order and specialty pharmacy. Market shares calculated as percentage of total annual prescriptions reported by companies responding to survey.