Prepaid debit card provider Green Dot adds nearly a quarter to flotation value.

Prepaid debit card provider Green Dot has increased the number of shares in its flotation plans two months after US-based retailer Wal-Mart Stores made a strategic investment in the company.

Wal-Mart said it had no intention to sell its 2.2 million A shares in Green Dot, which manages its prepaid card business.

Green Dot said its other shareholders, excluding venture capital firm Sequoia Capital, which is its largest shareholder, would sell 4.17 million shares. It had previously said they…