An American shareholder of Ainsworth Game Technology has accused the poker machine maker of misleading minority shareholders after it said it would hand control to Novomatic, an Austrian family-owned business.

Ainsworth told investors on Monday that Novomatic, its major shareholder, would acquire the 47.1 per cent of shares it did not already own for a cash consideration of $1 per share. The offer was a 35 per cent premium on Ainsworth’s last closing price, giving it an enterprise value of $336.5 million. Shares climbed more than 31 per cent to 97¢ on Monday.