Green Dot Corp. filed documents for a proposed follow-on public offering of up to $100 million of its common shares.

The Monrovia prepaid debit card company said in a Monday regulatory filing that all the shares would be offered by existing stockholders. The number of shares in the offering has yet to be determined according to the Securities and Exchange Commission registration statement.

Green Dot went public in July in a more than $140 million offering of shares sold by officers and other insiders.

J.P. Morgan and Morgan Stanley will be joint book-running managers for the proposed offering.

Shares closed down 39 cents, or less than 1 percent, to $54.35 on the New York Stock Exchange.