Shared finance report

How did the US stock market perform today, including the major indices, the biggest movers, and what drove them?

September 21, 2026

Research Report

Question: You are a rigorous financial research analyst. Ground EVERY quantitative claim in data you actually pulled from the finance tools — never invent a price, multiple, or indicator. Answer the REQUEST below by:

  1. Identifying the specific publicly-tradable assets (tickers) it concerns. When the request is open-ended (e.g. "top up-and-coming tech companies"), first find concrete candidates: use finance_data (action=search) to resolve names to tickers, and web search / the browser for qualitative discovery.
  2. For EVERY ticker you discuss, pull real data with the finance tools:
  1. Writing a concise report: a short investment thesis for each asset (why it is interesting, grounded in the pulled price/fundamentals/news/insider data), then a summary table with columns: Ticker | Price | 1d% | 5d% | 20d% | RSI | P/E | Trend. Rank assets by thesis strength, cite notable news/insider signals, and clearly flag any ticker you could not fetch.

REQUEST: How did the US stock market perform today, including the major indices, the biggest movers, and what drove them?

Date: 2026-09-21T04:50:40.623050176+00:00

Coverage window: 2026-09-21 – 2026-09-21

Rounds: 1

Status: PARTIAL

Objective check — 0 of 6 criteria met

The run produced work, but the objective below is not fully achieved. Each unmet criterion names what is still outstanding.

2 of 6 worker results were withheld as not deliverable and are NOT part of the analysis below. Their absence narrows the evidence base — see “Withheld worker results”. Consider re-running.

Evidence: 139 claims · 58 sourced · 11 partial · 12 unsupported · 57 self-reported (no independent source) · 16 single-source

Executive Summary — as of 2026-09-21

There is no 2026-09-21 close to report. As of every data pull made on Monday 2026-09-21, the US cash session had not yet opened — the finance tool's newest bar for every US equity, ETF and index proxy is 2026-09-18. A market-calendar page updated 2026-09-21T04:45:09Z rendered "Closed — No trading · Monday, September 21" and "It is before the pre-market open; the regular session starts at 9:30am ET" (regardsofwallstreet.com/today). Independent of that, the tool's own field last_bar read 2026-09-18 on daily, hourly and 15-minute intervals alike.

So the three things you asked for break down like this:

You askedStatus
Major indices' performance today (2026-09-21)No dated in-window source found. No close, no % change. Do not quote 2026-09-18 numbers as today's tape.
Biggest movers todayNo dated in-window source found. No verified individual-stock gainers or decliners were retrievable for 2026-09-21.
What drove themPartially answerable, pre-open only. The dated 2026-09-21 driver is US–China trade/AI diplomacy plus a fourth straight day of oil weakness — flowing into higher index futures, not into a tape that had traded.

What is verifiable for 2026-09-21 (pre-open, all timestamps in-window): index futures were higher — S&P +0.43%, Nasdaq +0.60%, Dow +0.36%, Russell +0.32% at 04:15:37Z — with the dollar index +0.09%, WTI crude −2.12% and gold −0.64% (squawknews.com/brief/livecast/2026-09-21). One vendor CFD print put the US500 at 7,651, +0.17%, but its own metadata timestamps it 12:00 UTC (08:00 ET, pre-open), so it cannot be a closing print (tradingeconomics.com/united-states/stock-market).

Also dated 2026-09-21: the published macro calendar was empty. "No scheduled economic data release or Fed event is on the calendar today" and the hour-by-hour schedule contains only two rows — 9:30am "Market opens", 4:00pm "Market closes" (regardsofwallstreet.com/today). SquawkNews independently logged "0 breaking or releases" for the day through 04:15 UTC.

The last completed session was Friday 2026-09-18, and it was a narrow, tech-led tape: SPY −0.119%, QQQ +0.632%, DIA −0.477%, IWM −0.466%; 2 of 11 sectors green, with Tech the leader and Materials the worst.

What drove the 2026-09-21 pre-open move

US–China trade and AI talks dominate the dated in-window flow. Treasury Secretary Bessent called the engagement with the Chinese "very successful" (23:48Z), state media described talks on trade as "candid, detailed, and constructive" (02:02Z) and confirmed separate talks on AI (02:02Z). Bloomberg's markets wrap, updated in-window at 2026-09-21T04:01:50Z, is headlined "Stocks Rise With US Futures, Brent Extends Decline" and states: "Stocks rose and futures pointed to more gains after the US described talks with China as 'very successful'… with S&P 500 contracts rising 0.4% and those on the Nasdaq 100 Index gaining 0.6%."

2026-09-21 (UTC)ItemURL
04:26S. Korea: 3 soldiers hurt in blast south of MDLlink
04:05Fed and BoE intensify review of bank risk from trading firms after Jane Street loss (FT)link
03:38China MoF auctions 10-yr bonds at 1.6626%link
02:07Hormuz transits 12 vessels over weekend, down from 35link
02:02China/US talks on AI issueslink
02:02China/US "candid, detailed, constructive" trade talkslink
01:21PBOC injects RMB165bn via 7-day reverse repos at 1.40%link
01:17Yuan midpoint strongest since 2023-02-03link
01:16Nadella to join OpenAI and Nvidia CEOs at Trump–Xi dinnerlink
00:00S. Korea Sept 1–20 exports +78.3% y/y; surplus $22.97bnlink

Two scoping corrections worth carrying: the Trump–Xi state dinner is 2026-09-24, an upcoming catalyst, not a today event (chinatechnews.com, 2026-09-20; en.sedaily.com, 2026-09-20); and the CNBC live-blog slug for the session, cnbc.com/2026/09/21/stock-market-today-live-updates.html, carries no visible publication date on the version reached, so its trending rail ("Oil falls as crude flows remain 'surprisingly strong'") is background only.

Last completed session — 2026-09-18 (baseline, not today)

Every figure below is the Friday 2026-09-18 bar (last_bar: 2026-09-18), the level the 2026-09-21 pre-market move is measured against. 1d % is 09-18 vs 09-17.

TickerPrice1d %5d %20d %RSI-14P/ETrend
SPY (S&P 500)761.69−0.119−0.34−0.11945.79–49.18not fetchedstrong_uptrend (range position 88.2%)
QQQ (Nasdaq-100)721.45+0.632+0.919+1.4852.43–55.86not fetchedstrong_uptrend (range position 85.9%)
DIA (Dow)515.88−0.477−1.885−2.20532.65–37.60not fetcheddowntrend (range position 67.9%)
IWM (Russell 2000)284.10−0.466−1.658−4.55926.89not fetchednot reported (range position 72.4%)
TLT (20y+ Treasuries)81.25−0.648+0.470−1.324not fetchednot fetchedrange position 6.7% of 250d

Caveats: no P/E values came back from any pull, and no official index-level prints (^GSPC, ^IXIC, ^DJI, ^RUT) were available at all — only the ETF proxies, whose numbers do not reconcile cleanly with the CFD vendor's 7,651 US500 level. RSI ranges reflect the same 09-18 bar returning different values across two pulls, so treat RSI decimals as soft. SPY's change_pct_1 (−0.119) and change_pct_20 (−0.119) came back identical, which flags that field as lower-confidence for SPY specifically.

Sector breadth on 2026-09-18 was decisively negative — 2 up, 9 down, a ~2.24pt spread between best and worst:

RankETFSectorClose1d %RSI-14
1XLKInfo Tech189.60+0.81951.8
2XLIIndustrials169.75+0.43828.3
3XLFFinancials55.86−0.03638.2
4XLVHealth Care168.39−0.24960.3
5XLEEnergy64.31−0.26471.6
6XLYCons. Disc.111.03−0.32333.0
7XLPCons. Staples82.80−0.82636.0
8XLREReal Estate42.53−0.95522.5
9XLCComm. Svcs110.81−1.37148.4
10XLUUtilities41.10−1.41526.0
11XLBMaterials49.99−1.42037.3

Rate-sensitive and commodity sectors were sold hardest, and they sit most stretched to the downside (XLRE RSI 22.5, XLU 26.0) — consistent with a bond-proxy unwind, though no 10-year yield was fetched, so that causal link is inference, not a sourced claim.

Analysis

The 2026-09-21 answer is a null result with a narrow positive core. The evidence that the session had not traded is threefold and independent: the finance feed's last_bar stopped at 2026-09-18 across daily, hourly and 15-minute intervals; an in-window calendar page (updated 04:45Z) said "Closed — No trading"; and a same-publisher daily digest for 2026-09-21 did not exist while the 2026-09-18 digest did. The newest news item in the feed was 2026-09-21T04:26:19Z — 00:26 ET, roughly nine hours before the open.

Within that window, the tape's setup is clear and one-directional: risk-on futures led by Nasdaq (+0.60%), on a US–China trade/AI catalyst that both the news feed and Bloomberg's wrap date to 2026-09-21, with oil as the offsetting weak spot (WTI −2.12%, Bloomberg: "Oil fell for a fourth day", and Hormuz transits at 12 vessels versus 35 the week before). The notable macro fact is the absence of one — no scheduled data release or Fed event on the published calendar. That is a statement about the published calendar only; the sources do not cover unscheduled remarks during the session.

One regime caution. Search snippets (undated or dated 2026-09-14 to 2026-09-18, and not fetched) describe a hiking Fed, 10-year yields above 5%, and crude above $100. Those are outside the window and are not evidence for 2026-09-21. Nothing in the dated in-window material supports or refutes any particular intraday narrative beyond the trade/AI and oil drivers above.

If you need the actual close: re-run the same batched call after ~20:00 ET on 2026-09-21 and check last_bar reads 2026-09-21 before trusting any one-day percentage. In this environment the daily field silently reflects the prior session whenever the current one is incomplete, which is exactly how Friday's tape gets mislabelled as Monday's.

Risks & Open Questions

Claims without independent support

These statements appear in the narrative above but are not backed by text retrieved from a source. SELF-REPORTED means the only thing asserting it is the swarm's own worker output — the narrative was written from that output, so it corroborates nothing. Treat all of these as unverified.

Withheld worker results

These workers did not return usable output, so their text was kept out of the analysis. Shown for diagnosis only — do not read them as findings.

Detailed Findings

Round 0 · Finding 1

US Market Recap — Session of Monday, 2026-09-21

⚠️ Executive summary — and a critical data-availability finding

I could not produce closing index levels or % moves for the 2026-09-21 session, because no completed 2026-09-21 bar exists in any finance tool I pulled. Every finance_data pull returned a last bar of 2026-09-18 — the Friday session. I am therefore reporting (a) the in-window 2026-09-21 headline flow, which does exist and is timestamped to the minute, and (b) the 2026-09-18 session as the most recent completed session, clearly labelled as not 2026-09-21. I have flagged every 2026-09-21 index/sector/mover datapoint as UNFETCHED rather than estimating it.

Evidence the 2026-09-21 cash session had not closed when the tools were pulled:

US markets are open on Monday 2026-09-21 — only Tokyo is closed (Respect for the Aged Day) per https://www.whendomarketsopen.com/market-holidays/2026/respect-for-the-aged-day/ and https://investomatica.com/is-stock-market-open.

1. In-window headline flow — items dated 2026-09-21 (PRIMARY DELIVERABLE)

All of the following are FinancialJuice wire items with explicit 2026-09-21 ISO timestamps, returned by the finance_news tool.

…(truncated — the summary above captures the substance)

Round 0 · Finding 2

2026-09-21 US Market Session — Sector ETF Report

⚠️ HEADLINE FINDING: There is no 2026-09-21 session data to report

The 2026-09-21 US trading session had not occurred (and therefore had not closed) at the time of this data pull. Every finance-tool call returned data whose most recent bar is Friday 2026-09-18. I cannot report 2026-09-21 index levels, sector returns, movers, or macro inputs, because none exist in any source I could reach. Per the mission's anti-goals, I am not substituting the prior session or filling the gap from memory.

Evidence that the 2026-09-21 session has no data (three independent checks)

CheckResult
Sandbox clock (browser eval, new Date())"Mon Sep 21 2026 00:42:53 GMT-0400 (Eastern Daylight Time)" — i.e. pre-market Monday, before the 09:30 ET open. new Date('2026-09-21').getUTCDay() = 1 (Monday), so 2026-09-21 is a normal trading weekday, not a holiday.
finance_data action=history interval=15m on SPY (30 bars)first_bar: 2026-09-17 19:00, last_bar: **2026-09-18 19:45**. The most recent intraday print in the feed is Friday's post-close. Zero 2026-09-21 bars.
http_request on https://stockmarketwatch.com/digest/2026-09-21HTTP 404 — "Page Not Found", and the site banner reads "Market Closed". The same publisher's /digest/2026-09-18 page is indexed and live. A daily digest for 9/21 does not exist.

Therefore: all 11 sector ETF returns below are for the last completed session, Friday 2026-09-18 — NOT for 2026-09-21. They are labelled as such and must not be quoted as the 9/21 tape.

Findings — 11 S&P 500 sector ETFs, last completed session (Fri 2026-09-18)

All values from a single batched finance_data action=analyze call (bars=30, interval 1d) on XLK, XLF, XLE, XLV, XLY, XLP, XLI, XLB, XLU, XLRE, XLC. The field used is change_pct_1 (one-day percent change as of the feed's last_bar = 2026-09-18 13:30 ET), alongside price (last close in the feed) and rsi_14.

Ranked best → worst by that session's change_pct_1:

RankETFSectorClose ($)1d % (change_pct_1)RSI-14Direction
1XLKInfo Technology189.60+0.81951.8🟢 Up
2XLIIndustrials169.75+0.43828.3🟢 Up
3XLFFinancials55.86−0.03638.2🔴 Down (flat)
4XLVHealth Care168.39−0.24960.3🔴 Down
5XLEEnergy64.31−0.26471.6🔴 Down
6XLYConsumer Discretionary111.03−0.32333.0🔴 Down
7XLPConsumer Staples82.80−0.82636.0🔴 Down
8XLREReal Estate42.53−0.95522.5🔴 Down
9XLCCommunication Services110.81−1.37148.4🔴 Down
10XLUUtilities41.10−1.41526.0🔴 Down
11XLBMaterials49.99−1.42037.3🔴 Down

…(truncated — the summary above captures the substance)

Round 0 · Finding 3

US Equities & Macro Inputs — 2026-09-21 Session

Bottom line up front: I could not produce closing index levels, one-day percent moves, or 2026-09-21 values for the 10-year/2-year Treasury yields, the VIX or the US dollar index — because none of them exist yet in any source I could reach, and the finance tools' data hard-stops at 2026-09-18. Every in-window source I successfully fetched is timestamped before the 2026-09-21 regular session opened (latest: 04:45 UTC = 00:45 ET, versus a 09:30 ET open). I am reporting the overnight/pre-market picture, the (empty) policy calendar, and the one clearly identified driver — and flagging every number I could not get rather than estimating it.

1. The most important finding: the 2026-09-21 session had not begun at the time of every in-window source

The finance data pipeline's most recent bar is 2026-09-18, and a dated market-calendar page fetched on 2026-09-21 states the market was still closed:

Consequence: any 2026-09-21 "close" or "1-day % change" for the S&P 500, Nasdaq Composite, Dow or Russell 2000 that I stated would be invented. I state none.

2. Requested macro inputs: fetched vs. NOT fetched

…(truncated — the summary above captures the substance)

Round 0 · Finding 4

US Equity Market Recap — Session of Monday 2026-09-21: DATA UNAVAILABLE FOR THE SESSION; HERE IS WHAT IS VERIFIED AND WHAT IS NOT

1. Executive Summary

I could not produce a closing recap of the 2026-09-21 session, and I am not going to invent one. The finance tool's data horizon ends at the 2026-09-18 bar for every US equity, ETF and index proxy I requested — daily, hourly and 15-minute alike. Its most recent bar is 2026-09-18 13:30:00 (the Friday open) or 2026-09-18 19:30/19:45 intraday. There is no 2026-09-21 bar for any US equity instrument in the tool.

Consequently the mission's core success criteria — a finance_data analyze pull giving the 2026-09-21 closing level and one-day % change for SPY/QQQ/DIA/IWM — cannot be satisfied. I am flagging that as a hard gap rather than substituting Friday's numbers or a remembered figure.

What I can verify for 2026-09-21 is (a) pre-market/Asian-session futures and cross-asset positioning from a dated in-window live blog, (b) a CFD-quoted S&P 500 (US500) level with a same-day timestamp, and (c) a set of 2026-09-21-dated macro/geopolitical headlines from the finance_news feed. None of these is a US cash-session close.

2. Key Findings

2.1 HARD BLOCKER — the finance tool has no 2026-09-21 US equity bar (confidence: HIGH)

Every finance_data call returned last_bar: 2026-09-18:

SymbolPrice1d %5d %20d %RSI-14Last barSource
SPY761.69−0.119−0.34−0.11945.792026-09-18 13:30finance_data analyze
QQQ721.45+0.632+0.919+1.48—2026-09-18 13:30finance_data quote
QQQ (1h)721.34+0.307+0.569+1.65460.822026-09-18 19:30finance_data history 1h
IWM284.10−0.466−1.658−4.55939.98 (1h)2026-09-18 13:30finance_data analyze
GLD401.17+0.705+0.602−3.393—2026-09-18 13:30finance_data quote
BTCUSD81,422.99+0.324+6.932+5.199—2026-09-21 00:00finance_data quote

These are the 2026-09-18 (Friday) session's numbers, NOT the 2026-09-21 session's. They are presented only to document the data horizon. BTCUSD is the only instrument in the entire pull carrying a 2026-09-21-dated bar, and crypto trades 24/7, so its +0.324% is not a US equity-session move.

Additional finance_data analyze fields for SPY on 2026-09-18: SMA20 764.30, SMA50 766.71, EMA21 764.13, MACD −2.856 vs signal −2.517 (hist −0.339), ATR-14 6.07, VWMA-20 763.76, Bollinger 773.83/754.78, 20-day avg volume 40,822,424, 52-week range 629.28–779.37 (position 88.2%), trend: "unknown". QQQ 1h: SMA20 714.37, SMA50 711.80, MACD 2.580 vs signal 2.008, range position 98.2%. IWM 1h: SMA20 284.98, SMA50 285.23, MACD −0.836, range position 38.6%.

2.2 In-window (2026-09-21) evidence I did obtain

…(truncated — the summary above captures the substance)

Investigation Trail

Round 0

Sources

Trace Index

Tool-call traces are persisted under /srv/swarm_web_runs/run-1789965669155-0004/finance_output/traces.

This report was researched and written by a Swarmio run — a swarm of AI agents that searches the web, reads the sources, and shows its working.

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