Novo Nordisk isn't in the Vanguard Healthcare ETF because it is a Danish company, and the fund focuses on U.S. companies. The ETF would be down even more if it included Novo Nordisk since the company ...

The Vanguard S&P 500 ETF ( VOO -0.08%) is the most widely held exchange-traded fund (ETF) on the trading platform Robinhood.

Plus, how fund managers are balancing different levels of liquidity of private market assets as the landscape evolves.