We investigate the link between exchange-traded funds and real investment. Cross-sectionally, higher ETF ownership is associated with an increased sensitivity of real investment to Tobin’s q and a heightened ability of stock returns to forecast future earnings. Inclusion of stocks in industry ETFs enhances investment-q sensitivity and implies greater incorporation of earnings information into prices prior to public releases. Greater nonmarket ETF ownership leads to increased (reduced) reliance of real investment on own (peers’) stock prices. Overall, the evidence is consistent with ETFs positively affecting real investment efficiency via greater flows of information.

We examine a regulatory change that increased the reporting frequency of mutual funds' portfolios. Using a difference‐in‐differences design, we find that firms with greater ownership by mutual funds increase share repurchases following the regulatory change. We show that these share repurchases are a firm's rational response to undervaluation, which occurs because fund managers become shortsighted following the regulation and sell companies with good long‐term prospects. Collectively, our results shed light on an unintended consequence of more frequent reporting in a delegated asset management framework.