Investor Ron Burkle has been noticeably quiet since Barnes & Noble announced the interest received last week from Liberty Media in buying the company, but it turns out he was talking with his wallet. In the required SEC filing, Burkle disclosed that his Yucaipa companies purchased another 603,000 shares yesterday, paying $18.489 a share. Though Burkle is restricted by the company’s poison pill from acquiring more than 20 percent of shares, he had a small amount of room to buy. According to the filing, his 11,894,213 shares comprise 19.74 percent of shares outstanding. He could still buy another 150,000 shares or […]