NEW YORK, March 26, 2012 /PRNewswire/ -- VASCO Data Security International, Inc. (NASD: VDSI) will replace O'Charley's Inc. (NASD: CHUX) in the S&P SmallCap 600 index after the close of trading on Monday, April 2.  S&P MidCap 400 constituent Fidelity National Financial, Inc. (NYSE: FNF) is acquiring O'Charley's in a deal expected to be completed soon pending final approvals.

Aon Corp. (NYSE: AON) will remain in the S&P 500 index following its reorganization into a newly formed public limited company, Aon plc. Each share of Aon Corp. common stock will be exchanged for one Class A Ordinary share of Aon plc on a one for one basis before the opening of trading on Monday, April 2.

VASCO Data Security International designs, develops, markets, and supports hardware and software security systems that manage and secure access to information assets. Headquartered in Oakbrook Terrace, IL, the company will be added to the S&P SmallCap 600 GICS Systems Software Sub-Industry index.

Following is a summary of the change:

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