31 CFR 356.22: Does the Treasury have any limitations on auction awards?

(a) Awards to noncompetitive bidders. The maximum award to any noncompetitive bidder is $10 million. This limit does not apply to bidders bidding solely through a request to reinvest the proceeds of a maturing security held directly with Treasury.

(b) Awards to competitive bidders. The maximum award is 35 percent of the offering amount less the bidder's net long position as reportable under § 356.13. For example, in a note auction with a $10 billion offering amount, and therefore a maximum award of $3.5 billion, a bidder with a reported net long position of $1 billion could receive a maximum auction award of $2.5 billion. When the bids and net long positions of more than one person or entity must be combined, as is the case with investment advisers and controlled accounts (See § 356.15(c).), we will use this combined amount for the purpose of this 35 percent award limit.