ET, the yield on the 10-year Treasury was down by over six basis points to 3.3319%.
U.S. Treasury yields fell on Monday as investors considered the stability of the banking sector after Swiss bank UBS agreed to buy its rival Credit Suisse.
Over the weekend, the Swiss National Bank, the Swiss Financial Market Supervisory Authority and the Swiss government worked on the takeover of Credit Suisse by UBS, the two largest Swiss banks.
As part of the deal, the Swiss National Bank and Swiss government also announced they would take measures to support the deal, including a loan of up to 100 billion Swiss francs ($108 billion).
Last week, Credit Suisse's biggest investor, the Saudi National Bank, said it could no longer support the Swiss bank financially.