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Over the next two months, Treasury said it expects to increase the size of its 2-, 3-, and 5-year note auctions by $1 billion a month, and would increase the size of its floating-rate note auction by $1 billion in November.

The decline in floating-rate note sales doesn’t mean companies aren’t able to sell all the bonds they need.

A 2-year floating-rate note is likely to count toward meeting firms' new liquidity and collateral requirements, which could make the note appealing to investors, said Mayra Rodriguez Valladares, managing principal of MRV Associates.

Analysts say they expect that Treasury would pay about 0.17 percent interest for a two-year floating-rate note, based on Tuesday’s numbers.

The floating-rate note would allow the Treasury to simultaneously capture the benefits of paying a lower interest rate and locking up money for a longer period.