Acorns is a financial services company focused on facilitating micro-investing by enabling the investment of aggregated sub-dollar amounts in fractional shares with high frequency and allowing people to save and invest their money. The Acorns app, which leverages a proprietary brokerage and advisory engine, rounds up credit, and debit card purchases to the nearest dollar, then automatically collects and invests that spare change into a portfolio of index funds offered by money managers Blackrock, Vanguard, and PIMCO.