New gilts are sold to the market on a calendar that the Debt Management Office publishes in advance, and the price each one fetches is decided at its auction, not on that calendar.
The DMO sells gilts on a published schedule
New gilts do not appear by surprise. The UK Debt Management Office (DMO), which issues gilts on behalf of HM Treasury, publishes an issuance calendar that sets out, ahead of time, when it expects to offer each gilt and of what kind. A buyer who wants to know what is coming to the market, and when, has a single published source to check rather than a stream of ad hoc announcements.
The calendar is a plan, not a promise of price. It fixes the dates on which the DMO expects to run auctions and the broad shape of what it will sell; the price a new gilt fetches is set at the auction itself, by the balance of bids and offers. So the calendar answers the question of what is being issued and when, while the market answers the separate question of at what price.
That split is worth holding on to. A reader watching the calendar can prepare for a new issue, but cannot deduce its yield from the calendar entry. The issuance programme is announced in advance because the market needs notice; the pricing is discovered on the day, because that is what an auction does.
What happens at an auction
At an auction the DMO offers a set amount of a named gilt and investors bid for it. The bids are gathered and a price is struck that clears the amount on offer; that price fixes the yield at issue, and the gilt is then said to have been issued. Every gilt carries an ISIN — the code that identifies it — and a coupon fixed before the auction, both of which appear on its record from the day it starts trading.
Auctions are not the only mechanism. Some gilts, particularly larger or longer-dated ones, are placed by syndication through a group of banks, and a tap issue adds to an existing gilt. The common thread is that issuance is announced and priced through a published process, so the market knows what is coming and can see what each operation raised.
The result of an auction — the amount sold, the price and the yield at issue — is published by the DMO once the operation has run. It is one number captured at one moment, and it is the starting point from which the gilt's market price then moves.
The auction result is one moment; the market is every day after
Once issued, a gilt trades on the secondary market like any other, and its price moves away from the auction price as the market reprices. GiltIQ picks up each newly issued gilt's first clean price and gross yield in the daily report that follows its appearance, so a reader can see where the new gilt settled the day after its auction and how that compares with the gilts already in issue.
That first row is the figure the market pages give and an auction summary does not carry: the new gilt priced on the same terms as every other, with a clean price and a gross yield that can be set beside its neighbours at a similar maturity. The auction result says what the issuer received on one day; the first reported row says how the market priced the new gilt once it was trading.
Why the calendar matters to a buyer
For a reader thinking about buying, the calendar and the list of gilts in issue answer different questions, and it helps to keep them apart:
- The calendar shows what is coming: a further sale in one part of the curve adds to the gilts available at that maturity.
- The list of gilts in issue shows what is already there, priced and tradable on the day.
- The auction price is set by demand at the sale, so the calendar tells a reader what is being issued but never what a gilt will cost.
None of this is a reason to wait for, or avoid, a new issue; it is the background that makes an announced auction make sense as part of a larger programme of government borrowing.
Reading a new gilt's row
A new gilt's record carries figures set in different places and at different times. The table separates what is fixed at issue from what the market decides afterwards.
| Figure | What sets it | Does it move? |
| ISIN | Assigned when the gilt is created | No |
| Coupon | Fixed before the auction | No |
| Clean price | The market, from the day it first trades | Yes |
| Gross yield | Recomputed from the clean price | Yes |
| DMO yield | The market, on the DMO convention | Yes |
Reading the table left to right shows why the coupon stays put while the clean price and the yields move around it: the first two are terms of the instrument, and the last three are what the market makes of them on a given day.
Where to follow it
The conventional gilts list shows every gilt in issue, new and old, with its clean price and yields; open a gilt from it and its own page picks up the price history from its first appearance, so a reader can see how a new issue has traded since its auction. The auction calendar itself is the DMO's to publish, and the site's part is the priced row that follows it onto the list.
Background, not advice
This article explains how gilt issuance and the auction calendar work; it is general background, not investment, tax or legal advice for any reader's circumstances. Auction dates, amounts and conventions come from the UK Debt Management Office, and prices come from the day's market data; those are the primary sources for any figure here. The calendar says what is being issued, not what a gilt is worth.