The Fed's $6.75 Trillion Balance Sheet Is Growing Again — Should Americans Be Worried?

The Fed’s balance sheet rose about $2.5 billion in the week ended November 4 to $6.748 trillion, up roughly $212 billion from its December 3, 2025 low. Treasury holdings have increased about $390 billion since December 2025, while mortgage-backed securities fell about $170 billion to $1.88 trillion, potentially leaving private investors to absorb more mortgage-bond supply. The article says reserve-management buying is intended to support short-term market plumbing, not replicate 2020 quantitative easing; the 10-year Treasury yield was 4.84% on November 5, versus 5.31% on October 5 and 4.17% a year earlier. Larger monthly purchases or a shift to longer-dated Treasury buying, especially with core PCE inflation still at 3.1% year over year versus the Fed’s 2% target, would signal a move toward stimulus and could put renewed upward pressure on long-term and mortgage rates.

Analysis

The key market distinction is composition, not the headline asset total. Bill-focused reserve purchases can ease money-market funding without materially lowering the long-end term premium; treating them as QE risks buying duration on the wrong signal. Conversely, MBS runoff shifts some duration and prepayment risk back to private holders, potentially widening agency-MBS spreads versus Treasuries even if Treasury yields are unchanged. That spread channel—not a mechanical one-for-one rise in mortgage rates—is the more direct housing transmission.

Near term, reserve operations may benefit bank funding stability, but they do not fix housing affordability. Over 1–3 months, the New York Fed purchase schedule and the maturity mix matter more than weekly balance-sheet changes; core inflation persistence would make any expansion in longer-dated buying a credibility test. Over 6–18 months, sustained MBS supply alongside elevated mortgage rates could weigh on transaction volumes and builder pricing power before showing up in home prices. Builders may initially defend volumes through incentives, pressuring margins; mortgage originators face weaker refinancing and purchase activity.

Contrarian point: low refinancing can slow MBS prepayments, so runoff and private duration supply need not map cleanly to a fixed monthly demand shock. Fiscal issuance, term premium, and inflation expectations may dominate mortgage pricing. The article’s alarm case is not confirmed by reserve growth alone; verify purchase composition, MBS spreads, and inflation expectations before adding duration risk.

Key Decisions for Investors

• Do not trade the balance-sheet headline as QE. Track the New York Fed’s monthly purchase schedule and distinguish bills from coupon Treasuries; bill-only purchases are not, by themselves, a long-duration bullish signal.
• Watch agency-MBS spreads versus comparable Treasuries. Consider an underweight to agency MBS relative to Treasuries only if spreads widen persistently alongside ongoing Fed runoff; without spread and prepayment data, keep this as an alert rather than a standalone position.
• If the Fed shifts toward longer-dated Treasury purchases while core inflation remains sticky, consider a 2s10s steepener as a conditional expression of greater long-end inflation/term-premium risk. Reassess if inflation expectations fall or the long end rallies despite the shift.
• Monitor homebuilder incentives, order cancellations, and mortgage-origination volumes over the next 1–3 months. Weakening demand with rising incentives would support underweighting housing-sensitive equities; stable orders and firm pricing would falsify that read.