Invest1 publisher2 min readPublished
French covered bonds undercut their own sovereign by at most 13 basis points
Bonds secured on French mortgage pools have priced inside OATs all year, by 6 to 13 basis points. France's ten-year still pays 90 over Germany, so the collateral takes back a seventh of that at best.
The Investor · Invest desk
What happened
- French covered bonds have traded 6 to 13 basis points below their sovereign equivalents through 2026, inverting the usual order in which government paper is the tightest French credit.
- BNP Paribas, Societe Generale and Credit Agricole have all placed primary covered deals at spreads inside OATs during the year, with investors accepting the sub-sovereign level.
- The French ten-year traded 90 basis points over German Bunds on September 9, 2026, the widest that gap has been since 2012.
Compiled by The InvestorSomething wrong?How this is made
Why it matters
- contradiction The ordering says collateral outranks the sovereign; the size says otherwise, because 6 to 13 basis points is 7% to 14% of what France pays over Germany, so the preference is priced as a sliver, not a break.
- constraint One year of French sovereign issuance equals about 61% of the entire outstanding covered bond market, which caps how much of an OAT allocation can actually move into secured French paper.
- decision A French bank treasurer can now fund below the sovereign, but only on the part of the balance sheet with a segregated mortgage or public-sector pool behind it.
- exposure Anyone marking euro rate exposure against OATs is marking against a book more than half traded by hedge funds, whose positions unwind on a changed thesis rather than sitting in a pension portfolio.
A covered bond stays on the issuing bank's balance sheet and is also secured on a segregated pool of mortgages or public-sector loans, so the holder has two sources of repayment where an OAT holder has one [6]. French legislation adds over-collateralization and bankruptcy protection, and cryptobriefing.com reports that insurers and pension funds have moved to covered paper for the predictability OATs no longer reliably give them [11].
The size of the preference is smaller than the reordering suggests. Ten-year OATs sat 90 basis points over Bunds on September 9, the widest since 2012 [2]. Covered paper printing 6 to 13 basis points inside the sovereign [1] therefore clears roughly 77 to 84 over Germany [1]. The collateral removes between 7% and 14% of France's premium over Germany [2].
Supply is the part buyers can see coming. France plans a record 310 billion euros of medium- and long-term issuance in 2026, with public debt near 117% of GDP [3][4]. The entire French covered bond market, the largest in the world, was about 510 billion euros in mid-2025 [5]. One year of sovereign issuance equals roughly 61% of the outstanding stock of the instrument investors are switching into [3].
Who owns the sovereign shapes how its spread moves. Hedge funds are now more than half of OAT trading volumes [7], and Cayman Islands-domiciled entities held 64 billion dollars of French sovereign paper as of June 2025 [8]. According to cryptobriefing.com, a hedge fund's OAT position is often a relative-value or macro trade that unwinds quickly, while a pension fund tends to hold [13].
The narrow version of this is the one the numbers support: the order has flipped, and the gap is 6 to 13 basis points [1]. A 13 basis point move in the differential puts BNP Paribas, Societe Generale and Credit Agricole back to paying up over their own government, after a year of placing primary deals at sub-OAT spreads [9]. Clarity on the parliamentary picture before the 2027 presidential election would do it from the sovereign side, since bond markets price that risk well ahead of the vote [10]. cryptobriefing.com does not name a trader, dealer or index behind the sub-OAT prints [12].
What prices inside the sovereign is the collateralized slice of a bank's funding, the part with a pool attached [6]. For a treasurer holding French counterparty or euro rate exposure, that is the whole practical content of the repricing: the cheapest French bank paper is secured paper, and the benchmark it prices against is still 90 over Bunds [2].
What to watch
- Whether the 90 basis point OAT-Bund spread narrows as the 2027 presidential campaign clarifies France's parliamentary position, which would erase the covered bond advantage from the sovereign side.
- Whether primary covered deals from the large French banks keep clearing inside OATs while the 310 billion euro 2026 issuance programme runs.
- Whether hedge funds' share of OAT trading volumes falls back below half as buy-and-hold holders return.