Poolside's Read

Rotation, not exit — For the first time, Norway proposes moving approximately $80 billion away from U.S. Treasuries and toward mortgage bonds.

The Fed, is the market's largest owner of Mortgage-Backed Securities (MBS) – holding approximately $1.9 trillion as of mid-2026.

Any shift would be phased in gradually to limit market impact, and realistically not before well into 2027. Against a $31.5 trillion Treasury market, the sum is marginal.

Headline

Norway's $2.3 trillion sovereign fund sent its finance ministry a letter on September 1, proposing it trim U.S. government debt positions across its benchmark fund and — for the first time — folding in U.S. agency mortgage-backed securities.

Norges Bank Investment Management manages Norway's Government Pension Fund Global — the world's largest sovereign wealth fund

It recommended cutting the government-bond slice of its bond benchmark from 70% to 50%, with U.S. Treasuries, the single biggest holding, taking the deepest cut. In dollars, that's roughly $80 billion pared from about $215 billion in Treasuries.

70% → 50%Government bonds in the fund's benchmark
34.1% → 21.9%U.S. Treasuries' share of the bond index
~$80BTrimmed from its Treasury position
~$215BTreasuries held at end of June

Proposal only — not a sale. Figures per NBIM's Sept. 1 letter and Reuters estimates.

Global bond selloff

Government borrowing costs jumped worldwide this week in a broader global bond selloff:

  • Japan's 10-year crossed 3% for the first time since 1996
  • The U.K. gilt neared 5.3% (highest since 2008)
  • The German Bund hit its highest since 2011 as Europe joined in.
  • The U.S. 10-year Treasury yield hit 4.8% on Tuesday, with the 30-year at 5.27%.

What happens next in Norway

  1. Ministry reviews the letter
    Norges Bank IM awaits Norway's finance ministry response before anything moves.
  2. Formal recommendations in January
    The proposals fold into the fund's recommendations to the ministry.
  3. Spring white paper & parliament
    Debated in the annual white paper, then a ministry recommendation and a parliamentary hearing.
  4. Gradual implementation, 2027 at the earliest
    If approved, any cuts phase in slowly to limit market and transaction costs.

Sources: CNBC · CNN · Reuters · Wall Street Journal · CNBC — El-Erian · Bloomberg · Federal Reserve · St. Louis Fed (FRED), plus Norges Bank Investment Management's letter of 1 September 2026 to Norway's Ministry of Finance. Figures as reported at publication; the proposal remains subject to review.