The couple is 64. He spent 28 years at a major tech company, accumulating $423,000 in employer stock through ESPP grants and RSUs. Add another $477,000 in diversified accounts, and the household holds roughly $900,000 in investable assets. The hidden problem: nearly 47% of the portfolio sits in a single stock. When that ticker is ... A $900,000 Portfolio With 47 Percent in One Tech Stock Is the Retirement Time Bomb Most Couples Refuse to Defuse