How the wealthiest families invest: CNBC and Addepar launch Family Office Portfolio Tracker

Key points

• A version of this article first appeared in CNBC's Inside Wealth newsletter with Robert Frank, a weekly guide to the high-net-worth investor and consumer.
• Sign up to receive future editions, straight to your inbox.
• Public stocks are the largest and fastest-growing asset class for family offices, while their real estate assets are shrinking, according to the new CNBC Family Office Portfolio Tracker.
• Family offices now manage over $5.5 trillion in wealth globally, rivaling hedge funds in total assets.
• Yet because family offices – the private investment arms of ultra-wealthy families – aren't required to disclose their investments, their portfolios are largely secret.