Recent data for the tri-party repo market, which represents a significant part of the entire US repo market, indicates that US government securities account for approximately 54.3% by dollar value of the most common collateral types, agency mortgage-backed securities and collateralized mortgage obligations account for 26.3%, and equities make up 6.9%.
In addition, corporate bonds account for 5% non-agency mortgage-backed and asset-backed securities for roughly 3.4%, Federal agency and government sponsored enterprises securities (for example, Fannie Mae and Freddie Mac) account for approximately 2.0%, and other (which includes collateralized debt obligations, international securities, municipality debt, and whole loans) account for the remaining 2.0%.