During the 1980s, Salomon was noted for its innovation in the bond market, selling the first mortgage-backed security, a hitherto obscure species of financial instrument created by Ginnie Mae. Shortly thereafter, Salomon purchased home mortgages from thrifts throughout the United States and packaged them into mortgage-backed securities, which it sold to local and international investors. Later, it moved away from traditional investment banking (helping companies raise funds in the capital market and negotiating mergers and acquisitions) to almost exclusively proprietary trading (the buying and selling of stocks, bonds, options, etc. for the profit of the company itself). Salomon had expertise in fixed income securities and trading based on daily swings in the bond market.