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The operator of a New York-based investment firm greatly increased his company’s stake in Monaco Coach Corp. during June, according to the insiderSCORES.com news service.

Wesley Richard Guylay, whose firm bears his name, bought 697,600 shares of Monaco stock for $11.44 to $13 a share between June 9 and June 29, according to insiderScores.com.

As of April, Guylay’s firm, which represents the billionaire Bass family of Fort Worth, Tex., owned 1.11 million, or 5.9%, of Monaco’s common stock.

Separately, Richard Rouse, a member of Monaco’s Board of Directors, sold 31,050 Monaco shares, insiderSCORES.com reported.

Rouse sold the shares for $13.12 to $13.36 on June 12 and June 13, according to the news service. As of April, Rouse owned 99,537 shares of Monaco stock.