This study models the closely held (PE) share of U.S. nonfinancial corporate equity over time. Corporate income tax rates, the Sarbanes-Oxley Act, default risk, and the real medium-run Treasury yield significantly affect the PE share, consistent with other studies which separately analyze these factors. The PE share is negatively related to business loan delinquencies and real medium-term Treasury rates. High interest rates discourage PE funds from using leverage to finance buyouts of public companies and fund distributions of interim cash distributions that enhance the relative liquidity of the closely held firms in PE fund portfolios. Interim cash distributions by PE funds help to avoid the double-taxation of dividends, thus causing the appeal of PE to rise with corporate income tax rates, which increases the PE share. The PE share rose during the Enron scandal and after the Sarbanes-Oxley Act (SOX), which increased the costs of continuing as, or becoming, a publicly traded corporation. The PE share is well explained and tracked by key macroeconomic variables as well as tax and regulatory policies. • We model the private equity (PE) share of US nonfinancial corporate equity over time. • Business loan delinquencies and real medium-term Treasury rates lower the PE share. • Sarbanes-Oxley increased the PE share by raising the costs of being a public firm. • The PE share is well modeled by key macroeconomic, tax, and regulatory variables.

In the financial crisis and recession induced by the Covid-19 pandemic, many investment-grade firms became unable to borrow from securities markets. In response, the Fed not only reopened its commercial paper funding facility but also announced it would purchase newly issued and seasoned corporate bonds rated as investment grade before the Covid pandemic. We assess the effectiveness of this program using long sample periods, spanning the Great Depression through the Great and Covid Recessions. Findings indicate that the announcement of corporate bond backstop facilities helped stop risk premia from rising further than they had by late-March 2020. In doing so, these backstop facilities limited the role of external finance premia in amplifying the macroeconomic impact of the Covid pandemic. Nevertheless, the corporate bond programs blend the roles of the Federal Reserve in conducting monetary policy via its balance sheet, acting as a lender of last resort, and pursuing credit policies.