Enterprise firms with more than 1000 employees continue to represent the largest proportion of spending, In-Stat reports. At approximately 11 thousand firms, they currently account for nearly 41% of all US business telecom spending. In-Stat expects 5 year CAGR of 6.5% overall due to strong growth on data and managed service spending. The proportion of spending by small and mid-sized firms from 5-999 employees will accelerate the fastest and grow to 46% of all US business spending in 2008. Wireline Data Services remains the overall largest revenue segment (41%) followed by wireless voice (30%)