Federal Reserve Adds Treasuries, Sells MBS, Net Reduction $13 B

The Federal Reserve increased its treasury holdings by $0.1 billion in the week ended April 25. It reduced MBS by $13.1 billion, for a total reduction of $13 billion.

Are Fed balance sheet changes correlated with the stock market?

This second chart is the S&P 500 compared to Federal Reserve balance sheet, both indexed to 100 as of December 31, 2017.