Main Street Capital Corp. is selling up to 9.5 million common shares in an at-the-market offering.

Net proceeds will be used to repay outstanding debt borrowed under its revolving credit facility. In addition, through re-borrowing under the credit facility, Main Street Capital plans to make investments in marketable securities and idle funds, pay operating expenses and other cash obligations, and for general corporate purposes.

The company on Aug. 15 added Comerica Securities Inc. as one of the sales agents in the offering. Other sales agents include BB&T Capital Markets LLC, RBC Capital Markets LLC and Raymond James & Associates Inc.