SUMMARY OF CBOT SUPPLEMENTAL PENSION PLAN

Key employees of the Company or CBOT Holdings, Inc., a Delaware corporation (“Holdings”), whose benefits under the Company’s tax-qualified defined benefit pension plan (the “Pension Plan”) are limited by reason of Sections 401(a)(17) and 415 of the Internal Revenue Code of 1986, as amended (the “Code”), and who have been selected to participate in the plan by the Board of Directors of the Company or Holdings or a committee thereof.

Eligible participants shall receive the present value of the reduction in the age 65 lump sum value of their accrued benefits under the Pension Plan resulting from the limitation on compensation includible for such purposes due to the operation of Section 401(a)(17) of the Code and the limitation on benefits under Section 415 of the Code.

Benefits are calculated and payable on an annual basis. The first such payment shall be calculated as of the last day of the year in which the participant becomes vested in his or her accrued benefit under the Pension Plan. Thereafter, any increase in the aggregate reduction in accruals attributable to the operation of such Code sections shall be calculated as of the last day of each year.

The amount of the benefit payable each year is adjusted for the effect of taxes such that the amount paid, after payment of taxes on such amount, plus assumed after-tax earnings, will be equal to the after-tax lump sum value at age 65.

Payments for each year are calculated in accordance with assumptions established from time to time by the Human Resources Committee.

Discount rate:

Present value of age 65 lump sum amount discounted to last day of calendar year for which payment is made at 4.93% per annum (after-tax equivalent of 8% return).

Interest Rate Assumption:

Mortality Assumption:

No adjustments: