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Ancestry.com Inc.

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NBC’s decision not to renew the “Who Do You Think You Are?’’ show “could hamper’’ shares of the online provider of family histories in the short term, according to BMO Capital Markets. Shares of Ancestry.com fell 14 percent, the second-most in the Russell 2000 index. The Utah company had 1.7 million paying subscribers as of Dec. 31 who use its Web-based services to build family trees. Revenue comes mainly from providing online access to historical records.

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