IBKR Market Insights — September 11, 2026

It Didn't, or Doesn't, Matter — 2026-09-11

Core thesis: Despite significant macro headwinds (yields +12 bps, crude +6%, hot inflation data), equities are displaying remarkable resilience and psychological strength—rallying through bad news via a "ratchet effect" where stocks absorb downside but refuse to give back gains when macro inputs reverse.

Key points:

  • Yesterday's SPX decline of 0.58% was modest relative to the magnitude of moves in 10-year yields and crude oil; pre-market futures erased losses on only minor improvements in bonds and oil.
  • Core CPI rose 0.3% in August (vs. 0.2% expected), pushing FOMC rate-hike probability to 86% (CME FedWatch) from 72% yesterday; IBKR Prediction Markets show 80% "Yes."
  • University of Michigan sentiment plunged to 47.8 (near May's 44.8 record low), with 1-year inflation expectations jumping to 4.6% from 4.0%—signals of consumer stress, especially lower-income cohorts.
  • Pre-market dips are treated as buying opportunities; even Oracle's (ORCL) 8% gap-up rally faded to losses by midday, yet equities remained bid.
  • Bond yields initially dipped 4 bps on rate-hike fears, then erased most gains; equity traders ignored both the move and deteriorating sentiment data.

Takeaway: Equity market psychology remains solid despite inflation and rate-hike risks. Traders are either exhibiting nihilism, willful ignorance, or betting that inflation ultimately supports long-term valuations. Monitor whether this resilience holds if macro data continues to deteriorate or if the "ratchet effect" finally breaks.

This content is for informational purposes only and does not constitute financial, investment, or trading advice. Always consult a qualified financial professional before making any investment decisions.