A major deal in the financial services sector is proving to be a boon to mutual funds that hold regional brokerages.

Wachovia's ( WB) announcement Thursday that it plans to buy A.G. Edwards ( AGE) in a $6.8 billion cash-and-stock deal, creating the second-largest U.S. brokerage firm after Merrill Lynch ( MER) sent the St. Louis firm's stock up 14.3% to $88.16.

The big move benefited investors in funds that hold a lot of AGE. As of March 31, the ( ARGFX) Ariel fund had 3.3% of its assets in A.G. Edwards, and the ( IMSCX) IMS Capital Value fund had 2.7%, according to Morningstar. Ariel closed Thursday up 0.7% at $58.44 while IMS Capital Value gained 0.6% to finish at $23.16. ( CVAAX) Calamos Value A , which held 2.37% as of January 31, picked up 0.5% to close at $14.17.

The deal sparked a rally among small regional brokerages, as traders snapped up shares of other companies that might get swept up in an industrywide wave of consolidation. Raymond James ( RJF) was up 7.3%, while Jeffries ( JEF) gained 4.7%. The ( HASCX) Harbor Small Cap Value Fund held 2.4% of its assets in Raymond James and 2.3% of its assets in Jefferies as of March 31. It finished Thursday ahead 0.8% at $22.76. Shares of Wachovia were down 0.7% Thursday to close at $54.19.