Arkhouse Management is nominating nine people for Macy’s board of directors, igniting a proxy battle after the department store operator rejected a $5.8 billion takeover offer from the investment firm and Brigade Capital Management. Macy’s Inc. said Tuesday that it had been seeking additional financing information from Arkhouse and Brigade to possibly advance talks with its board. But Macy’s said instead of making an attempt to provide additional information, Arkhouse sent a letter earlier this month requesting that the company extend its director nomination window by 10 days.