---
type: Indicator Dashboard
title: Bubble Warning Indicators, Mid-2026 Readings
description: Nine historically-validated indicators, seven scored; concentration flashing, credit-to-GDP gap quiet and negative, insider selling and valuations not scoreable.
resource: https://aibubblequestion.com/warning-lights
tags: [indicators, market-breadth, margin-debt, valuations, monetary-policy]
sources:
  - id: spy-holdings-aug2026
    title: "SPDR S&P 500 ETF Trust holdings"
    resource: https://www.ssga.com/us/en/individual/library-content/products/fund-data/etfs/us/holdings-daily-us-en-spy.xlsx
    author: "State Street Global Advisors"
    last_modified: 2026-08-28T00:00:00Z
  - id: finra-margin-statistics
    title: "FINRA margin statistics"
    resource: https://www.finra.org/rules-guidance/key-topics/margin-accounts/margin-statistics
    author: "FINRA"
  - id: fred-ice-bofa-oas
    title: "ICE BofA IG/HY option-adjusted spreads via FRED"
    resource: https://fred.stlouisfed.org/series/BAMLC0A0CM
    author: "Federal Reserve Bank of St. Louis (FRED)"
  - id: bis-credit-gaps
    title: "BIS credit gaps"
    resource: https://data.bis.org/topics/CREDIT_GAPS/data
    author: "Bank for International Settlements"
  - id: nber-tightening-and-peaks
    title: "NBER on tightening and peaks"
    resource: https://www.nber.org/system/files/working_papers/w18398/w18398.pdf
    author: "NBER"
  - id: fred-nasdaqcom
    title: "Nasdaq Composite Index (NASDAQCOM) via FRED"
    resource: https://fred.stlouisfed.org/series/NASDAQCOM
    author: "Federal Reserve Bank of St. Louis (FRED)"
generated:
  by: "claude/opus-5"
  at: 2026-08-30T00:00:00Z
status: stable
stale_after: 2026-11-30T00:00:00Z
verified:
  - by: "claude/opus-5"
    at: 2026-08-30T00:00:00Z
---

# Statuses (as assessed in the underlying research; 2025 through mid-2026, corrected
against primary data as of late August 2026)

| Indicator | Status | Reading |
| --- | --- | --- |
| Market concentration and breadth | FLASHING | Top-10 S&P 500 weight sits in the high 30s in fund-holdings data (37.6% by ticker, 39.1% with Alphabet's two classes combined; SPY, 27 Aug 2026) -- below the site's earlier 40.7% "record" claim, which no located methodology reproduces. The separate "AI Big 10" 14%-to-28% series has no locatable basket, provider or methodology across two independent search passes and is dropped rather than restated.[^spy-holdings-aug2026] |
| Insider selling | NOT SCOREABLE | Sustained AI-winner insider sales are real (Nvidia, Oracle, Palantir, 2024-25, much of it on pre-set 10b5-1 schedules) but no aggregate metric exists against any defined issuer universe or historical baseline. Would become scoreable with a named issuer basket and an aggregation methodology; none is published anywhere. |
| Margin debt and leverage | AMBER | FINRA's own series set an all-time record of $1.502T in June 2026 (the maximum of the full 1997-2026 series), then fell $84.8B (-5.65%) in July to $1.417T -- the largest one-month dollar drop in that 29-year record, still +38.6% year over year. The site's earlier "~1.9% of market cap" denominator does not trace to FINRA or any located source and is dropped.[^finra-margin-statistics] |
| New issuance | AMBER | Public IPOs remain below 1999 levels. A widely repeated $50-80B range for private credit into AI data-center vehicles has no locatable regulator filing, ratings-agency methodology, or consolidated dataset behind it across two independent search passes and is not scored here as a figure. |
| Central-bank policy | AMBER (MIXED) | Easing since Sept 2024 to 3.5-3.75% after aggressive hikes; compatible with melt-up or plateau |
| Valuations | NOT SCOREABLE | No named consensus-estimate vendor, timestamp, or earnings basis (GAAP vs. adjusted) is specified for a "Magnificent-7 forward P/E" reading, so no current figure can be certified. Would become scoreable with a locked vendor (e.g. LSEG/I-B-E-S, FactSet), horizon and earnings basis named. Nvidia's >25x price-to-sales at peaks and the 1999-2000 100x-earnings comparators are historical reference points, not re-verified this pass. |
| Capex vs operating cash flow | AMBER, RED IN SPOTS | Hyperscaler capex has risen sharply against operating cash flow across 2024-25 in each company's own filings, but no consolidated cross-company aggregate exists for a "Big-5" dollar or percentage figure; the site's earlier $356B-to-$433B debt aggregate and 50-60%-of-OCF ratio are dropped as unsupportable rather than restated. Oracle's negative free cash flow through 2029 is a market forecast, not an observed reading. |
| Credit spreads | QUIET (SECTOR AMBER) | Broad investment-grade and high-yield spreads tightened, not widened, into late August 2026 (IG 81bp->79bp, HY 270bp->263bp, 17-27 Aug), the opposite of "modest widening".[^fred-ice-bofa-oas] A narrower claim that AI-adjacent credits are wider has no named issuer basket and remains untestable either way. |
| Credit-to-GDP gap | QUIET | US gap has been negative continuously since 2021 Q4, at -11.5 percentage points in 2025 Q4 (latest available), ranging roughly -7.6 to -12.6pp through 2023-2025 -- not "modestly positive" as earlier stated. A negative gap signals credit growing below trend, not excess credit; the sign, not just the level, matters for what this indicator says.[^bis-credit-gaps] |

Nine indicators, seven scored, two (insider selling, valuations) not scoreable for want
of a published aggregate metric -- a qualitative grade on a quantitative-looking
dashboard is a defect this site criticises elsewhere and should not carry here either.

# Historical context

* Bubbles typically peaked within 0-18 months of central-bank tightening (6-7 of 8
  major cases since the 1840s).[^nber-tightening-and-peaks]
* Even correct consensus warnings historically ran 12-24 months early; expert warnings
  earlier still. Dashboards measure fragility, not timing.
* The board resembles 1998 (sector excess without an economy-wide credit boom) more
  than 2007. Caveat: AI leverage sits partly in private structures
  ([ai-money-loop](ai-money-loop.md)) that aggregate credit data sees poorly.
* A ~9.8% Nasdaq pullback from its 2 June 2026 record close (27,093.90) to a 29 July
  trough (24,442.94) had mostly reversed by late August (-2.55% as of 28 Aug 2026) --
  a reminder that a single snapshot of a live index goes stale within weeks, not that
  a new sustained decline is under way.[^fred-nasdaqcom]


[^spy-holdings-aug2026]: SPDR S&P 500 ETF Trust holdings
[^finra-margin-statistics]: FINRA margin statistics
[^fred-ice-bofa-oas]: ICE BofA IG/HY option-adjusted spreads via FRED
[^bis-credit-gaps]: BIS credit gaps
[^nber-tightening-and-peaks]: NBER on tightening and peaks
[^fred-nasdaqcom]: Nasdaq Composite Index (NASDAQCOM) via FRED