Did the S&P 500 really gain $6.5 trillion? Peter Tuchman's claim and the market rally explained

A spectacular number is doing the rounds alongside the latest US stock rally: a report attributed to New York Stock Exchange trader Peter Tuchman says the S&P 500 gained more than $6.5 trillion in market value while rising 0.95%. The market has had a strong start to the week, but those two figures cannot describe the same one-day move. That gap is a useful starting point for a more important question: how much of the rally is supported by company earnings and how much depends on investors continuing to pay up for them?

Let's break down what the S&P 500 actually did, why US stocks moved and what its earnings and valuation say about the market for an investor in India.

What happened to the S&P 500 on September 21 and 22, 2026?

The S&P 500 rose 1.49% to 7,764.70 on Monday, September 21. The Nasdaq Composite also hit a record close, helped by large technology shares. Tuesday was a different session: the S&P 500 slipped 0.06 point to 7,764.64, effectively unchanged, while the Nasdaq Composite gained 0.45% to 27,244.28. The Dow Jones Industrial Average fell 0.36% to 51,863.69. A strong Monday therefore did not turn into a second broad US market surge on Tuesday.

Sources: market closing reports for September 21 and 22 from The Wall Street Journal; S&P 500 and Nasdaq index data. The US session on September 23 had not opened at the stated cut-off.

The distinction matters because an index can stay near a high even when fewer parts of the market are doing the lifting. For readers following the live benchmarks, INDmoney has separate pages for the S&P 500 index and the Nasdaq Composite.

Did the S&P 500 add $6.5 trillion in a day?

A short market-voices report attributes the $6.5 trillion figure and a 0.95% gain to Tuchman, but says the underlying post was deleted. We could not independently verify the original wording, its time frame or the method used to calculate the dollar amount. It would be wrong to repeat $6.5 trillion as a confirmed single-session addition to the S&P 500's value.

Here is the arithmetic. To produce a $6.5 trillion increase from a 0.95% move, the starting value would have to be about $684 trillion: $6.5 trillion divided by 0.0095. For a scale check, if an index were worth $70 trillion, a 0.95% rise would correspond to roughly $665 billion, assuming its market value moved in line with the index and ignoring changes in share counts and constituents. The $70 trillion figure in that example is a round-number assumption, not a claim about the S&P 500's exact market value on September 23.

Source for the attributed figures: Traders Union's market-voices report. Calculations: INDmoney analysis. The illustrative market value is an assumption, not an observed data point.

The $6.5 trillion amount may refer to a longer period, a different collection of companies or a transcription error. Without the original post or a clear calculation, none of those explanations can be established. There is also a simpler lesson: an increase in quoted market capitalisation is a change in the price assigned to outstanding shares. It does not mean investors deposited that entire dollar amount into the market that day.

Why did US stocks rally?

Monday's move brought together a short-term relief factor and a longer-term earnings story. A drop in oil prices eased some concern that expensive energy would keep inflation high and interest rates elevated. At the same time, renewed demand for AI-related shares helped the Nasdaq and pulled the market-cap-weighted S&P 500 higher. By Tuesday, the S&P 500 had largely stopped rising even as technology strength continued, which argues against describing the move as an uninterrupted broad rally.

Interest rates remain a live counterweight. On September 16, the Federal Reserve raised its policy rate by 0.25 percentage point to a 3.75%–4.00% target range, saying inflation remained elevated. Higher rates increase the appeal of bonds and raise the discount rate investors use to value profits expected years from now. That effect matters most when a stock's price assumes rapid growth well into the future.

The transmission from falling oil to rising technology shares is therefore indirect. Cheaper oil can improve the inflation outlook, which may ease pressure on bond yields and support valuations. But a few days of lower oil do not reverse the Fed's decision or guarantee that inflation will cool. This makes the next inflation reading, oil price trend and bond-yield move more useful than a dramatic one-day market-value headline.

Are S&P 500 earnings supporting the rally?

There is a fundamental case behind part of the advance. FactSet's September 18 Earnings Insight estimated 28.9% year-on-year S&P 500 earnings growth for the third quarter of 2026 and 11.9% revenue growth. Those are forecasts, not results. Analysts also expected 31.8% earnings growth for calendar 2026, and FactSet reported more positive than negative company earnings guidance for the third quarter among the firms that had issued it: 72 positive versus 43 negative.

Source: FactSet Earnings Insight, September 18, 2026. Growth rates are estimates and can change as companies report.

The semiconductor comparison is particularly revealing. FactSet estimated technology sector earnings growth of 63.3%, but 24.2% excluding the semiconductor and semiconductor-equipment industry. Both figures are strong, yet the gap shows how much of the sector's apparent strength depends on one part of the AI spending chain. That is an argument for testing the durability of chip demand and cash generation rather than assuming every AI-themed company deserves the same valuation.

Is the S&P 500 expensive at current levels?

FactSet put the S&P 500's forward 12-month price-to-earnings ratio at 19.1 on September 18, below its five-year average of 19.8 and just above its ten-year average of 19.0. A forward P/E of 19.1 means investors were paying about $19.10 for each $1 of earnings analysts expected over the following year. That is a less alarming picture than an isolated claim that all US stocks are priced for perfection, but it leaves room for disappointment if profit forecasts are too optimistic.

The price and earnings denominator need the same date. FactSet used an index close of 7,637.76 in its September 18 report. Dividing that level by 19.1 implies roughly 400 index points of forecast earnings over the following 12 months. At the September 22 close of 7,764.64, the index would be about 19.4 times those same earnings if estimates had not moved. That 19.4 is our illustration, not a newly published FactSet multiple.

Illustration based on FactSet's September 18 index level and forward P/E, compared with the September 22 close. Rounded figures exclude dividends, changing estimates and index composition. These are scenarios, not price forecasts.

This is the central valuation trade-off. Companies can deliver higher profits while the index still struggles if investors become less willing to pay a high price for each dollar of those profits. Conversely, solid earnings paired with steady valuations can support further gains. The decision point is whether forecast earnings are resilient enough to absorb an oil rebound, another rise in yields or a slowdown in AI spending.

Is the S&P 500 rally broader than AI stocks?

The S&P 500 weights companies by their available market value, so a large company's move affects the index more than an equally sized percentage move in a smaller constituent. The Nasdaq's gains alongside a flat S&P 500 and a falling Dow on September 22 show why it pays to look beneath the headline. They do not, by themselves, tell us exactly how many S&P 500 constituents rose that day.

A practical breadth check is to compare the regular S&P 500 with its equal-weight version, which gives each member a 0.2% starting weight at a quarterly rebalance. If both keep advancing, participation is broadening; if only the regular index rises, the biggest companies may be doing more of the work. Another check is whether non-technology sectors begin contributing to earnings upgrades. FactSet's third-quarter forecast projected year-on-year earnings growth across all 11 sectors, although their contributions differ considerably.

The distinction also matters for anyone deciding between an S&P 500 tracker such as SPY and an equal-weight S&P 500 fund such as RSP. They own exposure to the same broad set of US companies but allocate it differently, so their performance can diverge when the largest shares dominate.

What does the S&P 500 rally mean for Indian investors?

An Indian investor's return from an unhedged US investment has two moving parts: the dollar return on the asset and the change in the rupee against the dollar. For example, a 10% dollar return paired with 5% rupee depreciation would turn ₹100 into about ₹115.50 before fees and taxes: 1.10 × 1.05 = 1.155. If the rupee appreciated 5% instead, the same dollar return would translate to about ₹104.50. These are arithmetic illustrations, not exchange-rate forecasts.

Illustrations use compounded currency and asset returns. They exclude transaction costs, fund expenses, spreads and tax.

The broader Indian-market connection runs through oil and global yields. India imports much of its crude, so a sustained energy-price decline can ease pressure on inflation and the import bill. But cheaper oil need not produce a matching rise in the Nifty: domestic earnings, valuations and currency flows still matter. Readers who want the index basics can use INDmoney's S&P 500 guide for Indian investors before comparing US and Indian exposures.

What should investors watch next?

The most useful near-term test is whether the rally's earnings and participation survive a change in the macro backdrop. Watch whether companies actually deliver against FactSet's Q3 forecasts, whether technology growth spreads beyond semiconductors and whether the equal-weight index begins to confirm the standard S&P 500's direction. Alongside those, watch oil, inflation and US Treasury yields, because a reversal there can change the multiple investors will pay even when earnings keep growing.

Peter Tuchman's reported dollar figure makes an eye-catching entry point, but the defensible conclusion is narrower. The S&P 500 had a strong September 21 and then closed flat on September 22. Its earnings outlook offered a real basis for optimism while the September 18 forward P/E was close to its ten-year average. The original context for the $6.5 trillion number remains unverified and it should not be presented as the value created by a 0.95% move in one session. For investors, the better question is whether profit growth and broader participation can keep pace with the expectations already built into prices.