At 63, with $900,000 in a brokerage account split across tech (45%), healthcare (30%), and financials (25%), you have built something real. The five holdings β€” Apple (NASDAQ:AAPL), Microsoft (NASDAQ:MSFT), Johnson & Johnson (NYSE:JNJ), UnitedHealth Group (NYSE:UNH), and JPMorgan Chase (NYSE:JPM) β€” are legitimate blue-chip businesses. The problem is what happens to all three sectors ... A $900,000 Stock Portfolio Exposed to Just Three Sectors Is a Retirement Time Bomb