đŸ€”Bubble Carnival or "Baby Bubble"? Indexes & MAG7 Valuation Amid the AI Boom

[Heart]Hello Tigers,

Is the US market curently a Carnival Before the Bubble Bursts or a "Baby Bubble"?[Allin]

On September 25, the three major U.S. stock indices closed lower for the third consecutive day: the $Dow Jones(.DJI)$ fell 0.38%, erasing all gains since the Federal Reserve signaled a "50bp rate cut" on September 18; the $S&P 500(.SPX)$ dropped another 0.5%, with a cumulative 1.8% decline over three days; and the $NASDAQ 100(NDX)$ also fell 0.5%, showing obvious short-term pressure.

Latest Valuation Check-Up: Big-3 Indexes & Mag-7 at a Glance:

Ticker

Latest Price($)

YTD 2025

TTW P/E

Forward P/E

Average P/E in 10 yrs

Forward P/E VS. Average P/E in 10 yrs

$S&P 500(.SPX)$

6656.92

12.29%

29.33

25.17

19.2

31.09%

$NASDAQ 100(NDX)$

24580.17

16.11%

37.8

30.8

25.9

18.92%

$Dow Jones(.DJI)$

46292.78

8%

31.87

23.11

18.5

25%

$NVIDIA(NVDA)$

178.43

32.32%

39.39

31.46

40.95

-23.17%

$Apple(AAPL)$

254.43

2.58%

34.23

32.35

22.62

43.02%

$Microsoft(MSFT)$

509.23

20.29%

32.91

32.68

28.16

16.05%

$Alphabet(GOOG)$

251.66

29.47%

24.85

24.21

25.24

-4.08%

$Alphabet(GOOGL)$

252.34

29.84%

24.84

24.28

25.16

-3.50%

$Amazon.com(AMZN)$

220.71

-0.57%

32.94

25.62

70.75

-63.79%

$Meta Platforms, Inc.(META)$

755.4

27.91%

26.97

21.43

26.14

-18.02%

$Tesla Motors(TSLA)$

425.85

4.84%

265.28

210.5

35.26

496.99%

Read more on >>đŸ€”Market is Expensive? A Glance of MAG 7 ’s P/E Ratio in 5 yrs

I. Three Core Triggers for the Three-Day Losing Streak

  1. Powell’s "Bubble Pricking": On September 23, he explicitly stated that "stock market valuations are quite high," which was seen as an oral cooling signal from the Fed. Historical data shows that after a Fed Chair names excessive asset prices, the broader market typically corrects by 5%-7% on average within three months.

  2. "Too Good" Economic Data Turns Negative: The preliminary September Markit Manufacturing PMI hit 54.2 (an 18-month high) and weekly initial jobless claims were below expectations. This pushed the probability of a 25bp rate cut in November down sharply from 74% to 49%, with the "Magnificent Seven" tech stocks falling 1.6% on average.

  3. Trump’s "Government Shutdown Threat": He called for a federal government shutdown if spending cuts are not approved by October 1. During the 35-day 2018-2019 shutdown, the $S&P 500(.SPX)$ fell 12%, and now sectors like defense and infrastructure are pricing in this political risk early.

II. Valuation Debate: A Repeat of 1929 or a "Baby Bubble"?

Despite short-term corrections, U.S. stocks have still posted solid year-to-date gains:

$S&P 500(.SPX)$ up ~12.29%, $NASDAQ(.IXIC)$ up ~15.92%, and $Dow Jones(.DJI)$ up ~12.58%.

However, views on valuations are sharply divided:

(1) Bears: Warn of a "1929-style Crash"

Mark Spitznagel, founder of black swan fund Universa Investments, warned that the S&P 500 may rise 20% to 8,000 points in the short term but could then plummet 80%. His logic includes: lingering liquidity boosting risk appetite, current "carnival" mirroring pre-1929 crash patterns, and record-high stock allocations by households and institutions.

  1. Short-term liquidity remains abundant: The Fed’s rate cut cycle has not ended, which continues to boost short-term risk appetite. The $S&P 500(.SPX)$ has risen by more than 13% so far this year, and a further 20% increase is "realistically possible";

  2. Historical signals have emerged: Before the 1929 crash, the average annualized return in the 12 months before the bear market started reached 26%, and the index even doubled before peaking. The current market's "doomsday carnival" highly aligns with this characteristic;

  3. Valuations and positions are approaching extreme levels: Long-term low interest rates combined with fiscal bailouts have pushed market valuations to historical highs. The proportion of U.S. household stock allocations has exceeded the peak during the dot-com bubble, and institutional stock exposures have even hit a new high since November 2007.

Metric

Dec 1999

Sep 2025

Take-away

S&P 500 P/E (TTM)

29.8×

29.3×

Slightly lower, still top-5% historic

Shiller CAPE

44.2×

37.1×

84% of 1999 level, above 1929

Price/Sales

2.1×

2.9×

More expensive than 1999

Tech weight in S&P

29%

34%

Higher concentration

Household equity/Fin assets

22.50%

20.70%

Knocking on 1999’s door

New issues + SPACs/Mkt cap

0.80%

1.10%

Even more liquidity splash

(2) Bulls: It’s a "Baby Bubble"

@Tiger_James Ooi strategist at Tiger Brokers, argues that the $NASDAQ 100(NDX)$ has risen only 120% since the 2023 AI boom—far less than the 1,073% surge during the 1995-2000 dot-com bubble.

Valuations also support this: the $NASDAQ 100(NDX)$ ’s current P/E is 30.7x (vs. its 10-year high of 40x), and the $S&P 500(.SPX)$ ’s P/E is still below its 10-year peak.

Data as of September 25th

Data as of September 25th

$Bank of America(BAC)$ ’s Michael Hartnett agrees the bubble isn’t finished: studying 10 major equity manias since 1900, the average trough-to-peak gain is 244%, implying the Mag-7 still has room to run. Boom phases are narrow and explosive—tech rallied 61% in six months during 2000 while the rest of the $S&P 500(.SPX)$ fell; today’s market has yet to reach that “extreme split.”

Hartnett advises hedging with “distressed value” stocks, as prior bursts of mega-cap euphoria ultimately lifted the economy and sparked a catch-up rally in cheaper names.

III. Four Risks of a Bubble Burst (with Probabilities)

Risk Type

Probability

Core Trigger Conditions

Impact on S&P 500

"Rate Hike-induced" Burst

30%

Core PCE exceeds 3.5% in Q1 2026, forcing the Fed to shift to rate hikes

35%-50% valuation pullback

"Earnings Collapse" Burst

35%

AI capex fails to drive revenue, dragging 2026 earnings growth to 0% (per Barclays: a 20% drop in data center capex could cut earnings by 3-4% and valuations by 10-13%)

70% of stocks face a "Davis Double Whammy"

"Liquidity Withdrawal" Burst

20%

$1.2T in new U.S. Treasuries issued in Q4 2025 + ongoing QT, pushing 10-year Treasury yield above 5%

Triggered stock-bond rebalancing sell-offs

"Black Swan" Burst

15%

Escalated Middle East conflicts, cross-strait tensions, etc.

Over 20% flash crash within a week

IV. Investor Responses: "Three Parachutes"

  1. Institutional-style "Rebalancing": Trim 2% of holdings whenever the portfolio rises 5% to reset to target stock weights.

  2. Option Hedging: Use Sell Put or Buy Put strategies to limit downside risk while holding long positions or call options.

  3. Cross-asset Diversification: Allocate 20% of positions to short-duration high-yield bonds, gold, and undervalued non-U.S. markets (e.g., Japanese stocks, Hong Kong stocks, Latin American markets).

Risk Disclosure: This analysis is based on public market data and historical patterns, and does not constitute investment advice. Investors should make decisions based on their own risk tolerance.


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Comment4

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  • äžŠé«˜ć±±
    ·09-26
    TOP
    seems baby bubble with < 3% drop and starts rallying up to support AI transformation. many AI CEOs supporting the market
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  • Esther_Ryan
    ·09-26
    Bill Ackman on his $Amazon.com(AMZN)$ investment:
    "Currently, only about 20% of IT workloads are estimated to be hosted in the cloud, a percentage that is expected to steadily increase and eventually invert over time."
    Reply
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  • joelanthony
    ·09-29
    when does the market open in sg time for spy
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  • tanks3
    ·09-26

    Great article

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