The reading rises or falls with policy size and auction mechanics, not with Treasury supply or investor demand. In the large-scale purchase era the sector saw about 4 operations a month, and in the small-value era usually 1 small test. January 2022 shares rest on a 12-month average of bonds outstanding:
- Nominal coupons 0 to 2.25 years, 31%: shortest coupons except paper with 4 weeks or less left.
- Nominal coupons 2.25 to 4.5 years, 20%: short to middle coupons.
- Nominal coupons 4.5 to 7 years, 16%: middle coupons with the leading 7-year note.
- Nominal coupons 7 to 22.5 years, 16%: joins the 7 to 10 and 10 to 22.5 slices, covering the 10-year area and longer bonds.
- Nominal coupons 22.5 to 30 years, 9%: longest nominal bonds near the 30-year area; this series.
- Inflation-protected paper 1 to 30 years, 8%: joins the 1 to 7.5 and 7.5 to 30 slices for inflation-linked bonds.
On November 18, 2021 the schedule set a $1.6 billion cap for 22.5 to 30 year bonds. Bidding ran 10:10 to 10:30 am, and dealers offered $3,762 million across 30 CUSIPs, distinct bond identifiers. The Desk accepted $1,576 million, each award at its own bid price, leaving $24 million unfilled for coverage of about 2.39 times. Four operations totaled about $6,298 million, so caps bind totals while lower acceptance than bids is normal, near 9% of all-sector buying.