www.StockMarketFunding.com S&P 500 Index Options Trading During Massive Market Selloff Due to S&P Downgrade. S&P downgrades Fannie and Freddie, US-backed debt S&P downgrades Fannie and Freddie, farm lenders and bank debt backed by US government. Standard & Poor's Ratings Services on Monday downgraded the credit ratings of Fannie Mae and Freddie Mac and other agencies linked to long-term US debt. The agency also lowered the ratings for farm lenders; long-term US government-backed debt issued by ...