(Bloomberg) -- Corporate breakups have come back in vogue, but only one of the two blue-chip spinoffs joining the S&P 500 Index this week found favor with investors.Most Read from BloombergApple Explores Home Robotics as Potential ‘Next Big Thing’ After Car FizzlesKim Jong Un Faces Annihilation in Most Korea War ScenariosTexas Toll Road Takeover to Cost Taxpayers at Least $1.7 BillionTSMC Facilities to Resume Production Overnight After QuakeA Million Simulations, One Verdict for US Economy: Debt