No. If you look at IB's website, they have a tiered commission schedule for unbundled commissions. 0 - 300k shares are .0035/shr 300,001 - 2MM are .002 2,000,001 -20MM .0015 etc. You have to add in rebates or costs for taking or adding liquidity to your trades. Depending on what ECN route you use some orders will be greater than the bundled fee for shares below 300k monthly. (Typical example, ARCA hits you for .003/shr for taking liquidity vs rebating .0023 for adding liquidity.) Just go to IB's commission page and run a few calculations on your monthly trading volume to see which is cheaper for your needs. Unless you are doing noting but market orders, you are better served going with the unbundled commission plan.