Editor’s note: This is general educational information about how Federal Government of Nigeria bond auctions are structured. It is not investment advice. It is based on the Debt Management Office and regulatory documents listed at the end.

Analysis: what the re-opening structure gives the issuer

The re-opening is usually explained as a liquidity device, and that is part of it. Concentrating issuance into a handful of large lines rather than scattering it across dozens of small ones gives each line enough outstanding stock to trade in size on the secondary market, which is what benchmark pricing requires. But the more interesting effect is on the issuer’s own flexibility.

Because the coupon is fixed, the DMO’s only variable at a re-opening is the price it is willing to accept and the volume it allots. That shows in the August numbers. On the 16.2499% FGN APR 2037 the office offered ₦100.00 billion, received ₦392.48 billion of bids across 171 bids, and allotted ₦110.01 billion to the market from 34 successful bids. On the 2038 it offered ₦750.00 billion, received ₦821.32 billion, and allotted ₦631.02 billion to the market from 161 of 225 bids. Neither outcome matches the amount offered, in either direction. The circular reserves the right to allot at the DMO’s discretion, and the results show that discretion being used.

The range of bids column is where the auction’s internal disagreement is visible. On the 2038 in August the book opened at 16.0000% against a clearing rate of 17.7900%, so a part of the book bid for yields well below what the DMO ended up paying. In July the lowest bid on the same bond was 17.0000% and it cleared at 18.4000%. A bid range that tightens alongside a falling clearing rate is a different signal from a falling clearing rate on an unchanged range, and the results tables publish both bounds.

What the re-opening structure does not do is tell a reader anything about the government’s total borrowing. The auction sells more of an existing bond, and the calendar for the third quarter of 2026 showed ranges of amount on offer rather than fixed sums, with a note that it is provisional and subject to change at short notice. The amount actually raised is set on the day, from a book the market submits, by an issuer that has published in advance that it need not accept it.

What the documents say

The Debt Management Office holds an FGN bond auction on one Monday of most months. The offer circular reads like a new issue, the results table reports a fresh clearing rate, and the press treats each one as a new borrowing. In practice almost none of it is new paper. The August 2026 auction offered three instruments and every one of them was a re-opening of a bond already trading in the market. So was every instrument at the July 2026 auction. The provisional third quarter calendar shows the first genuinely new bond of the quarter scheduled for the auction of 14 September.

What a re-opening is

A re-opening adds units to a bond that already exists. The 22.60% FGN JAN 2035 offered in August 2026 was issued at some earlier date with a coupon of 22.60% and a maturity of January 29, 2035. The DMO did not create a new ten-year security in August. It sold more of that one. The units bought at the August auction are legally and economically identical to units bought at any earlier auction of the same bond: same coupon, same maturity date, same interest payment dates, same ISIN in the depository record.

That is why the term-to-maturity line in the results table diverges from the tenor line. The August table describes the 22.60% FGN JAN 2035 as a ten-year bond with a term-to-maturity of 8 years, 5 months. The ten years is the original tenor set when the bond was first issued. The 8 years, 5 months is how much life it had left in August 2026. The 16.2499% FGN APR 2037 is listed as a twenty-year bond with 10 years, 8 months to run, and the 15.45% FGN JUN 2038 as a fifteen-year bond with 11 years, 10 months to run.

Coupon, marginal rate and accrued interest

The consequence of keeping an old bond alive is that its coupon cannot move. The August offer circular is explicit about how the price is set instead: for re-openings of previously issued bonds, where the coupon is already set, successful bidders pay a price corresponding to the yield-to-maturity bid that clears the volume being auctioned, plus any accrued interest on the instrument.

Three things follow. First, the marginal rate reported after the auction is a yield, not a coupon. The DMO’s August results state that successful bids for the three instruments were allotted at marginal rates of 17.1500%, 17.1900% and 17.7900%, and that the original coupons of 22.60%, 16.2499% and 15.45% will be maintained. Second, the difference between the two determines the price. A bond paying 22.60% that clears at a yield of 17.1500% must trade above its face value, because the buyer is paying up for a coupon stream richer than the prevailing market rate. A bond paying 15.45% that clears at 17.7900% must trade below it. Third, the accrued interest line exists because the bond is mid-coupon. Interest on FGN bonds is payable semi-annually, and a buyer settling on August 19, 2026 into a bond whose last coupon date has passed compensates the market for the interest that has built up since. That payment is returned in full at the next coupon date.

The offer circular sets the other terms that do not change with a re-opening. The circular sets a unit of sale with a minimum subscription and fixed multiples above it, which keeps the auction an institutional venue. Redemption is a bullet repayment on the maturity date. The bonds are listed on Nigerian Exchange Limited and FMDQ OTC Securities Exchange, qualify as liquid assets for bank liquidity ratio calculations, and are backed by the full faith and credit of the Federal Government of Nigeria and charged upon the general assets of Nigeria. Once listed, that secondary trading runs through NGX’s Fixed Income Market Making platform, which the exchange describes as a transparent order book with firm orders and pre- and post-trade reporting for federal, state and corporate debt. Bids are placed through the Primary Dealer Market Makers named in the circular.

Reading one auction against the last

The August 2026 auction was held on August 17, 2026 with settlement on August 19, 2026. The DMO offered ₦250.00 billion of the 22.60% FGN JAN 2035, ₦100.00 billion of the 16.2499% FGN APR 2037 and ₦750.00 billion of the 15.45% FGN JUN 2038. Subscriptions came to ₦513.61 billion, ₦392.48 billion and ₦821.32 billion. Allotments to the market were ₦64.13 billion, ₦110.01 billion and ₦631.02 billion, with a non-competitive allotment of ₦10.00 billion on the 2035 and ₦742.29 billion on the 2038.

The July 2026 auction, held on July 20, 2026, offered ₦400.00 billion of each of the same three bonds and cleared at marginal rates of 18.3400%, 18.3500% and 18.4000%. Because the instruments are identical across the two auctions, the month-on-month move in those marginal rates is a clean yield comparison rather than a comparison of two different securities. The 2035 cleared at 18.3400% in July and 17.1500% in August.