NASDAQ OMX Group (NDAQ)

NASDAQ OMX PHLX Benefit Plans Actuarial Assumptions

The following tables provide the weighted-average actuarial assumptions for the NASDAQ OMX PHLX Benefit Plans:

Weighted-average assumptions used to determine benefit obligations at the end of the fiscal year:

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The NASDAQ OMX Group, Inc.

Notes to Consolidated Financial Statements—(Continued)

Weighted-average assumptions used to determine net benefit cost for the fiscal year:

N/A—Not applicable

The asset allocations are reviewed quarterly by NASDAQ OMX’s Pension and 401(k) Committee and adjusted, as appropriate, to remain within target allocations. The investment policy is reviewed on an annual basis, under the advisement of an investment consultant, to determine if the policy or asset allocation targets should be changed. The NASDAQ OMX PHLX Pension Plan assets consisted of the following as of December 31, 2008:

The expected long-term rate of return on plan assets for the NASDAQ OMX PHLX Pension Plan is 8%, which is based on the aggregate historical returns of the investments that comprise the defined benefit plan portfolio. The investment strategy of the plan is to achieve an asset allocation balance within planned targets to preserve principal while obtaining an average 8% annual return for the long-term.