In late February, the activist investor and hedge fund manager requested that DuPont (DD) use a so-called universal proxy card at the chemical giant's upcoming shareholders meeting, according to a letter DuPont filed with the Securities and Exchange Commission on Tuesday afternoon. DuPont's response: No thanks. According to the letter, DuPont consulted with a range of experts and was told Peltz's latest proposal didn't make a lot of sense. The company also argues that issuing a universal proxy to all 600,000 of their individual shareholders would be an unwieldy affair.