Financial stocks were mixed in Tuesday afternoon trading with the NYSE Financial Index little changed, erasing earlier gains, and the Financial Select Sector SPDR Fund (XLF) adding 0.1%.

The Philadelphia Housing Index advanced 1.9%, and the Real Estate Select Sector SPDR Fund (XLRE) eased 0.2%.

Bitcoin (BTC-USD) rose 1.5% to $112,033, and the yield for 10-year US Treasuries shed 2.9 basis points to 3.96%.

In economic news, the current US federal government shutdown is the 15th since 1981 and is tied for the second-longest in US history as the political stalemate entered its 21st day, USA Today reported. No votes are scheduled on Capitol Hill on Tuesday.

In corporate news, Hologic (HOLX) agreed to be acquired by funds managed by Blackstone (BX) and TPG (TPG) in a deal worth up to $18.3 billion, or up to $79 per share. Blackstone shares rose 0.7%, and TPG added 1.3%.

Citigroup (C), Barclays (BCS) and Bank of America (BAC) are arranging $12.25 billion in debt to back Blackstone and TPG's Hologic acquisition, Bloomberg reported. Citi shares fell 0.8%, Barclays eased 0.2%, and Bank of America shed 0.5%.

Apollo Global Management (APO), KKR (KKR) and Carlyle (CG), alongside Cerberus, discussed pitching large-scale projects to help finance a $150 billion US Army infrastructure program, the Financial Times reported, citing an interview with Army Secretary Daniel Driscoll. Apollo shares rose 0.7%, KKR climbed 2.5%, and Carlyle was little changed.