Some of the largest U.S. companies are looking to hire cybersecurity experts in newly elevated positions and bring technologists on to their boards, a sign that corporate America is increasingly worried about hacking threats. JPMorgan Chase & Co, PepsiCo Inc, Cardinal Health Inc, Deere & Co and The United Services Automobile Association (USAA) are among the Fortune 500 companies seeking chief information security officers (CISOs) and other security personnel to shore up their cyber defenses, according to people with knowledge of the matter.