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:

• finance_data action=analyze — LIVE price, % returns, 52-week range position, and the indicator panel (RSI-14, MACD, SMA 50/200, VWMA-20/67, trend). Batch multiple tickers in one call.
• finance_data action=fundamentals — market cap, P/E & forward P/E, PEG, margins, revenue growth, analyst target & rating (use for valuation).
• finance_data action=quote source=pyth — fastest realtime spot price (esp. crypto) with a confidence band, when you need the very latest tick.
• finance_data action=liquidation — the VWMA-67 'true price' and leverage liquidation levels (great for crypto/timing context).
• finance_news — recent catalysts/sentiment (macro + per-ticker headlines).
• finance_insider — corporate insider (SEC Form 4) and, with scope=congress, political trades, to see informed-money flow. If scope=congress returns a browser_fallback (the free API was gated), follow it: use the browser tool on the given capitoltrades.com URL(s) and read the rendered trades table.

3. 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: 2026-09-20T04:52:12.710720586+00:00

Coverage window: 2026-09-20 – 2026-09-20

Rounds: 1

Status: PARTIAL

Objective check — 0 of 5 criteria met

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

• UNVERIFIABLE — The report states whether U.S. equity exchanges held a regular trading session on Sunday 2026-09-20, citing an official exchange calendar or market-status source.
  • the grader returned no verdict for this criterion
• UNVERIFIABLE — If markets were closed, the report clearly says there was no 2026-09-20 regular-session performance and gives the most recent prior session date, major index closing levels, and daily percentage changes with source URLs.
  • the grader returned no verdict for this criterion
• UNVERIFIABLE — The report lists at least three biggest gainers and three biggest losers from the most recent completed U.S. session as of 2026-09-20, with percentage moves and sources.
  • the grader returned no verdict for this criterion
• UNVERIFIABLE — The report identifies at least two specific drivers (macro data, Fed communications, earnings, geopolitical events, or sector news) cited in sources published 2026-09-20..2026-09-20.
  • the grader returned no verdict for this criterion
• UNVERIFIABLE — For any ticker discussed, the report provides an RSI and trend reading pulled via finance_data, or explicitly flags that the ticker data could not be fetched.
  • the grader returned no verdict for this criterion

Evidence: 155 claims · 74 sourced · 9 partial · 4 unsupported · 67 self-reported (no independent source) · 39 single-source

Executive Summary

There was no U.S. stock market session on 2026-09-20. That date is a Sunday; U.S. equity exchanges trade Monday–Friday, and the NYSE 2026 holiday calendar shows no September closure after Labor Day (Mon, Sept 7, 2026) (NYSE Holidays & Trading Hours, fetched 2026-09-20). Every index and ETF series pulled from the finance tools stops at a last_bar of 2026-09-18 — no 2026-09-19 or 2026-09-20 bar exists in any of them. So there is no "today's" performance to report; no 2026-09-20 close, percentage move, or mover list exists.

The most recent completed session was Friday, 2026-09-18, and it closed mixed: tech up, the Dow and small caps down. S&P 500 7,650.50 (+0.167%), Nasdaq Composite 26,522.55 (+0.395%), Nasdaq-100 29,644.17 (+0.67%), Dow 51,682.64 (−0.184%), Russell 2000 2,860.40 (−0.495%). Breadth was negative — only 2 of 11 S&P sectors closed higher. The next regular session is Monday, 2026-09-21.

Major Indices — Friday, 2026-09-18 session (last completed)

Prices below are the 2026-09-18 close, pulled 2026-09-20. P/E is not defined for indices and was not pulled for the ETFs — shown as N/A rather than estimated.

*SPY's 20-day field came back numerically identical to its 1-day field — a feed artifact; not relied on.

Fetch flags. ^GSPC, ^IXIC, ^DJI, ^RUT, ^VIX returned "no data … on any exchange" from action=analyze; the same benchmarks resolved as SPX, IXIC, DJI, RUT, NDQ and via action=quote. A Pyth action=quote for SPX/NDX/DJI/VIX returned HTTP 401.

Conflict, unresolved: the SPX index shows +0.167% while SPY shows −0.119% for the same session. Both are reported as pulled; the sign of the S&P 500's 09-18 move is not reconciled (a distribution/ex-dividend effect is plausible but unverified). The Dow-down / Nasdaq-up divergence is consistent across every source and tool.

Cross-asset (latest available, consistent with the 09-18 close): ^VIX 14.81, −4.08% (sub-15, low-vol regime); ^TNX (10-yr) 4.998%, +1.03%, pressing the 5% round number; DX-Y.NYB dollar index 100.215, −0.02%, with UUP +1.14% over five days. Calm equity vol, sticky long-end yields, firm dollar.

Breadth: of the 11 S&P sector ETFs pulled, only XLK Technology (+0.819%) and XLI Industrials (+0.438%) closed higher on 09-18. Worst: XLB Materials −1.42%, XLU Utilities −1.415%, XLC Communication Services −1.371%. Over 20 sessions only three sectors are positive (XLK +3.55%, XLE +0.878%, XLC +0.117%); Utilities sit at the 0.3rd percentile of their 52-week range (RSI 31.3, strong_downtrend) and Real Estate at RSI 31.1 — the clearest evidence of a defensive unwind.

Biggest Movers — Friday, 2026-09-18 session

Gainers, each cross-checked against finance_data (1d%, 5d%, RSI, trend pulled directly):

Two independent mover tables (StockSetups, headed "Session close · 4:00 PM ET · Sep 18, 2026"; TheDesperateTrader, dateModified 2026-09-20T04:45Z but explicitly ranking "Friday, Sep 18") bracket the tool's figures within ~2pp on every name — snapshot/split-adjustment differences, not disputed moves. IMCC's move is corroborated by ~2.3B shares traded on 09-18. Yes, these are micro-caps; that is what topped the tape.

Losers, single-sourced and NOT verified:

Source: StockSetups. I hold no RSI, trend, or independent price confirmation for these three, so treat the percentages as unverified. Also on that list but unverified: MSTZ −32.66%, DAIC −32.64%, SMST −32.46%, XENE −30.71%, AEHL −30.68%, NCT −27.93%, TCRT −25.00%. MSTX/MSTU/MSTZ/SMST appeared in mover lists without confirming whether they are operating companies or leveraged products — status unverified, so they are not characterized here. NVDA and ACXP only resolved when exchange=NASDAQ was pinned; RERE and PHGE returned no data on any exchange.

What Drove Friday's Tape

In-window (published 2026-09-20) — macro and geopolitics, no U.S. session attached:

Pre-window context (2026-09-19, labeled): Treasury's Bessent and USTR Greer scheduled to meet Chinese Vice Premier He Lifeng on Sunday at JPMorgan HQ in New York; Houthi claims of attacks on an Aramco facility at Yanbu and on Riyadh; a U.S. strike on a Caribbean vessel. These are weekend positioning inputs for Monday's open, not Sunday price action — and note the FinancialJuice timestamps are UTC, so the 01:00–03:59Z items are Saturday-evening ET.

Drivers of the 09-18 session itself (source published 2026-09-18, i.e. outside the window — prior-session context): Investrade's Sept 18 close recap attributes the fade to (1) a 25bp Fed hike on Wednesday Sept 16 — described as the first hike in over three years under Chair Kevin Warsh — with ~90% market-implied odds of another by Dec 9 and 55% by Oct 28; (2) other central banks: BoE held at 3.75%, BoJ raised 25bp to 1.25%, its fastest tightening in 30+ years; (3) rising Treasury yields — the 2-year hit a two-year high; (4) a fourth straight week of U.S. equity fund outflows, −$31.44bn (LSEG Lipper); (5) soft August data — industrial production unchanged vs +0.3% consensus, capacity utilization 76.3%; (6) AI-slowdown commentary earlier in the week hitting semis. Multi-week sector downtrends as of Sept 18: Transports, small caps, Industrials and Consumer Discretionary down five straight weeks, XLY down six, with XLP, XLI and XLRE down five — which matches the negative 20-day ETF readings above. The "Fed hike" characterization comes from that secondary recap; it was not verified against a primary Federal Reserve statement in these pulls.

No dated in-window source was found attributing a U.S. equity index move, a futures direction, or a sentiment shift to a specific catalyst — because no U.S. session occurred inside the window. Sunday-evening Globex futures status and any Sunday index-futures move are likewise unverified: the finance feed contains no 2026-09-20 bar for ES, NQ, YM or RTY (ES/NQ/RTY series end 2026-09-17 22:00 UTC; YM1! could not be fetched), and the one Sunday futures URL attempted returned 404. This is stated as a gap, not as "flat."

Analysis

The 09-18 session was narrow leadership on negative breadth: the cap-weighted S&P and Nasdaq rose while the equal-weighting-sensitive Dow and Russell 2000 fell and 9 of 11 sectors declined. The sector set confirms it — Technology and Industrials were the only green sectors, and over 20 sessions only Technology, Energy and Communication Services are positive, with Utilities and Real Estate at the bottom of their 52-week ranges. That is a rotation out of rate-sensitive defensives toward tech and energy, consistent with a 10-year yield near 5.00% and a fourth consecutive week of equity fund outflows. Small caps (RUT RSI 35.0, 20-day −4.4%, below its 50-day) and the Dow (RSI 38.5, below its 50-day and both VWMAs) are the weak legs; Nasdaq-100 is the strong leg at RSI 55.8, above its 50-day and both VWMAs, near the top of its 52-week range (85.9%). VIX at 14.81 says the market is not pricing stress — it is pricing a slow grind with thin participation.

Risks & Open Questions

• The report's central claim is a calendar fact, not a market call: 2026-09-20 was a Sunday and no session occurred. The strongest in-window evidence is a live market-status page self-dated Sunday, September 20, 2026 (investomatica.com), plus the NYSE calendar and the absence of any 09-19/09-20 bar across 20+ pulled series. Nasdaq's own holiday page and CME's hours page were unreachable, so Nasdaq- and futures-specific confirmation is unverified.
• S&P 500 09-18 sign is unresolved (index +0.167% vs SPY −0.119%); Dow level also differs slightly by source (51,680 vs 51,682.64). Use the ETF proxies where you need dated bars.
• Loser percentages (SDM, MKDW, NVVE and the rest of that list) are single-sourced and unverified — pull them through finance_data before publishing any of them, and pin exchange= for small caps.
• A secondary page claiming a "Sept 18 closing bell" with SPY at $713.94 (+0.77%) and an ACXP surge was excluded (status of that page unverified; its figures contradict pulled data on price, percentage and index level). Single-source market recaps should be cross-checked against raw feed data before use.
• No 2026-09-20-published article describing a U.S. session, or attributing one, was found — none can exist. Weekend coverage is China policy, energy supply risk and pre-positioning for Monday 2026-09-21.

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.

• [SELF-REPORTED] There was no U.S. stock market session on 2026-09-20.** That date is a Sunday; U.S. equity exchanges trade Monday–Friday, and the NYSE 2026 holiday calendar shows no September closure after Labor Day (Mon, Sept 7, 2026) (NYSE Holidays & Trading Hours, fetched 2026-09-20).
• [SELF-REPORTED] So there is no "today's" performance to report; no 2026-09-20 close, percentage move, or mover list exists.
• [PARTIAL] The most recent completed session was Friday, 2026-09-18**, and it closed mixed: tech up, the Dow and small caps down. S&P 500 7,650.50 (+0.167%), Nasdaq Composite 26,522.55 (+0.395%), Nasdaq-100 29,644.17 (+0.67%), Dow 51,682.64 (−0.184%), Russell 2000 2,860.40 (−0.495%). (unmatched: 0.167, 0.395, 0.184, 0.495)
• [UNSUPPORTED] 1d%
• [UNSUPPORTED] 5d%
• [SELF-REPORTED] +0.167
• [SELF-REPORTED] −0.085
• [SELF-REPORTED] +0.122
• [SELF-REPORTED] 50.71
• [SELF-REPORTED] +0.395
• [SELF-REPORTED] +1.747
• [SELF-REPORTED] 55.72
• [SELF-REPORTED] +0.939
• [SELF-REPORTED] 55.83
• [SELF-REPORTED] −0.184
• [SELF-REPORTED] −1.694
• [SELF-REPORTED] −2.041
• [SELF-REPORTED] 38.46
• [SELF-REPORTED] −0.495
• [SELF-REPORTED] −4.412
• [SELF-REPORTED] 35.05
• [SELF-REPORTED] −0.119
• [SELF-REPORTED] −0.340
• [SELF-REPORTED] −0.119*
• [SELF-REPORTED] 49.18
• [SELF-REPORTED] +0.632
• [SELF-REPORTED] +0.919
• [SELF-REPORTED] +1.480
• [SELF-REPORTED] 55.86
• [SELF-REPORTED] 515.88
• [SELF-REPORTED] −0.477
• [SELF-REPORTED] −1.885
• [SELF-REPORTED] −2.205
• [SELF-REPORTED] 37.60
• [SELF-REPORTED] 284.10
• [SELF-REPORTED] −0.466
• [SELF-REPORTED] −1.658
• [SELF-REPORTED] −4.559
• [SELF-REPORTED] 34.36
• [SELF-REPORTED] Fetch flags.** ^GSPC, ^IXIC, ^DJI, ^RUT, ^VIX returned "no data … on any exchange" from action=analyze; the same benchmarks resolved as SPX, IXIC, DJI, RUT, NDQ and via action=quote.
• [UNSUPPORTED] A Pyth action=quote for SPX/NDX/DJI/VIX returned HTTP 401. (unmatched: 401)
• [SELF-REPORTED] Conflict, unresolved:** the SPX index shows +0.167% while SPY shows −0.119% for the same session.
• [SELF-REPORTED] The Dow-down / Nasdaq-up divergence is consistent across every source and tool.
• [PARTIAL] Cross-asset (latest available, consistent with the 09-18 close):** ^VIX 14.81, −4.08% (sub-15, low-vol regime); ^TNX (10-yr) 4.998%, +1.03%, pressing the 5% round number; DX-Y.NYB dollar index 100.215, −0.02%, with UUP +1.14% over five days. (unmatched: 4.998, 100.215)
• [PARTIAL] Breadth:** of the 11 S&P sector ETFs pulled, only XLK Technology (+0.819%) and XLI Industrials (+0.438%) closed higher on 09-18. (unmatched: 0.819, 0.438)
• [PARTIAL] Worst: XLB Materials −1.42%, XLU Utilities −1.415%, XLC Communication Services −1.371%. (unmatched: 1.415, 1.371)
• [PARTIAL] Over 20 sessions only three sectors are positive (XLK +3.55%, XLE +0.878%, XLC +0.117%); Utilities sit at the 0.3rd percentile of their 52-week range (RSI 31.3, strong_downtrend) and Real Estate at RSI 31.1 — the clearest evidence of a defensive unwind. (unmatched: 0.878, 0.117, 31.3, 31.1)
• [SELF-REPORTED] +141.71
• [SELF-REPORTED] +23.58
• [SELF-REPORTED] 67.21
• [SELF-REPORTED] +50.49
• [SELF-REPORTED] +264.50
• [SELF-REPORTED] 90.89
• [SELF-REPORTED] +50.83
• [SELF-REPORTED] +132.35
• [SELF-REPORTED] +64.55
• [SELF-REPORTED] 49.37
• [SELF-REPORTED] +43.87
• [SELF-REPORTED] +15.18
• [SELF-REPORTED] 55.66
• [SELF-REPORTED] +70.04
• [SELF-REPORTED] +162.19
• [SELF-REPORTED] 83.30
• [SELF-REPORTED] +82.41
• [SELF-REPORTED] +100.16
• [SELF-REPORTED] 78.45
• [SELF-REPORTED] +34.32
• [SELF-REPORTED] −2.45
• [SELF-REPORTED] −42.83
• [SELF-REPORTED] 33.42
• [SELF-REPORTED] MSTX/MSTU/MSTZ/SMST appeared in mover lists without confirming whether they are operating companies or leveraged products — status unverified, so they are not characterized here.
• [UNSUPPORTED] 01:00
• [PARTIAL] FinancialJuice (unmatched: 9770612)
• [PARTIAL] FinancialJuice (unmatched: 9770621, 140)
• [SELF-REPORTED] FinancialJuice
• [PARTIAL] Small caps (RUT RSI 35.0, 20-day −4.4%, below its 50-day) and the Dow (RSI 38.5, below its 50-day and both VWMAs) are the weak legs; Nasdaq-100 is the strong leg at RSI 55.8, above its 50-day and both VWMAs, near the top of its 52-week range (85.9%). (unmatched: 4.4, 38.5, 55.8, 85.9)
• [SELF-REPORTED] The report's central claim is a calendar fact, not a market call: 2026-09-20 was a Sunday and no session occurred.
• [SELF-REPORTED] The strongest in-window evidence is a live market-status page self-dated Sunday, September 20, 2026 (investomatica.com), plus the NYSE calendar and the absence of any 09-19/09-20 bar across 20+ pulled series.
• [SELF-REPORTED] Nasdaq's own holiday page and CME's hours page were unreachable, so Nasdaq- and futures-specific confirmation is unverified.
• [PARTIAL] S&P 500 09-18 sign is unresolved (index +0.167% vs SPY −0.119%); Dow level also differs slightly by source (51,680 vs 51,682.64). (unmatched: 0.167, 0.119, 51680)

Detailed Findings

Round 0 · Finding 1

U.S. Market Performance — Sunday, September 20, 2026

1. Executive Summary

No U.S. equity session occurred on Sunday 2026-09-20. The most recent completed regular session as of that date was Friday, September 18, 2026. All performance figures below are labeled with that session date and are prior-session data, not "today's" data.

The Sept 18 session was mixed: the S&P 500 and Nasdaq Composite rose, while the Dow Jones Industrial Average and Russell 2000 fell. Sector-level action (my primary contribution here) shows narrow leadership: only 2 of the 11 S&P 500 sector ETFs I pulled were positive on the day — Technology (XLK) and Industrials (XLI) — while Materials (XLB), Utilities (XLU) and Communication Services (XLC) lagged. The 20-day picture is decisively defensive: Utilities (-6.10%), Real Estate (-5.66%) and Industrials (-5.57%) are the worst three, with Technology (+3.55%) the only sector showing meaningful 20-day strength.

Confidence: High that markets were closed on 2026-09-20. Confidence: High in the sector ETF figures (pulled directly from the finance tool). Confidence: Medium in the headline index levels (single fetched primary recap; one secondary snippet agrees on direction, another low-quality page disagrees on magnitude).

2. Was there a 2026-09-20 session? — NO

• The NYSE Holidays & Trading Hours page (fetched 2026-09-20) lists the full 2026 closure calendar. The only 2026 holidays are New Year's Day, MLK Day (Jan 19), Washington's Birthday (Feb 16), Good Friday (Apr 3), Memorial Day (May 25), Juneteenth (Jun 19), Independence Day observed (Jul 3), Labor Day (Monday, September 7, 2026), Thanksgiving (Nov 26) and Christmas (Dec 25). No closure or special session falls on September 18 or September 20, 2026. Source: https://www.nyse.com/markets/hours-calendars
• The same page states the NYSE Core Trading Session runs 9:30 a.m. to 4:00 p.m. ET on trading days, with pre-opening from 6:30 a.m. ET. September 20, 2026 is a Sunday — not a trading day. Source: https://www.nyse.com/markets/hours-calendars
• Corroborating (secondary, search-result snippet only — not a page I fetched): investomatica.com states "today, Saturday, September 19, 2026, the US stock market was closed. Tomorrow, Sunday, September 20, 2026, the US stock market will also be closed." https://investomatica.com/is-stock-market-open — flagged as unverified secondary snippet.
• Corroborating from the tool data itself: every finance_data bar series I pulled ends at last_bar: 2026-09-18 13:30:00 (i.e., the Sept 18 open). No 2026-09-19 or 2026-09-20 bar exists for any of the 20+ tickers I pulled.

Conclusion: There was no 2026-09-20 regular-session performance to report. The most recent completed U.S. session was Friday, September 18, 2026.

3. Major indices — Friday, September 18, 2026 session

…(truncated — the summary above captures the substance)

Round 0 · Finding 2

Market Status for Sunday, 2026-09-20: NO Regular U.S. Equity Session Occurred

Bottom line

2026-09-20 was a Sunday. No regular-session trading occurred on the NYSE, Nasdaq, or any other major U.S. equity exchange. Any "today's market performance" figures for 2026-09-20 would be fabricated. The most recent completed regular U.S. equity session was Friday, 2026-09-18, and figures for that session must be labeled as prior-session data.

1. The date itself

• The live market-status page at investomatica.com, rendered on the current date, states verbatim: "No, today, Sunday, September 20, 2026, the US stock market will be closed. Tomorrow, Monday, September 21, 2026, the US stock market will be open." Its on-page New York clock read 12:41:54 AM with status "Market Closed." — https://investomatica.com/is-stock-market-open (fetched; page self-dates to 2026-09-20)
• Independent corroboration of the weekday: the HTTP Date: response header returned by federalreserve.gov during this research was Sun, 20 Sep 2026 04:42:04 GMT (observed in the response to https://www.federalreserve.gov/paymentsystems/fedwire_hours.htm, 404 page). This confirms 2026-09-20 falls on a Sunday.

2. Official exchange calendar: no holiday, and no Sunday session

…(truncated — the summary above captures the substance)

Round 0 · Finding 3

U.S. Market Performance — as of Sunday, 2026-09-20

1. Executive Summary

There was no U.S. equity trading session on 2026-09-20. The date is a Sunday. U.S. equity exchanges (NYSE, Nasdaq) hold regular sessions on business days only; the NYSE holiday-and-hours calendar I fetched lists the next 2026 closure after Labor Day (Mon, Sept 7, 2026) as Thanksgiving (Thu, Nov 26, 2026), and it defines the "Core Trading Session" as 9:30 a.m.–4:00 p.m. ET on trading days (NYSE Holidays & Trading Hours, fetched 2026-09-20). Consequently any "today's market" figure for 2026-09-20 would be fabricated. The most recent completed regular session was Friday, 2026-09-18, and every performance number below is labeled as 2026-09-18 data.

In-window sourcing is thin — and this matters. I found essentially one page with a visible 2026-09-20 timestamp carrying session data (a market-data table at thedesperatetrader.com, dateModified: 2026-09-20T04:45:23Z), and it explicitly attributes its rankings to "Friday, Sep 18." I found no source published 2026-09-20 that reports market drivers. I therefore report drivers only as clearly-labeled background from 2026-09-18 sources. Separately, I caught and discarded one confident-looking "Sep 18, 2026 closing bell" page whose numbers are demonstrably wrong (see §5).

2. Key Findings (with confidence levels)

3. Detailed Analysis

3.1 Session status: no 2026-09-20 session

…(truncated — the summary above captures the substance)

Round 0 · Finding 4

U.S. Equity Index Futures & Global Cues — Sunday 2026-09-20

Bottom line up front: I could NOT verify that Sunday-evening futures trading on 2026-09-20 had opened, and I found NO in-window source reporting a Sunday futures percentage move. No finance tool I pulled contained a single 2026-09-20 bar for ES, NQ, or RTY. Everything quantitative below that describes price action is from the most recent completed session, Friday 2026-09-18, and is labeled as such.

1. Executive Summary

• No U.S. equity index futures move for Sunday 2026-09-20 could be sourced. The finance_data futures series for ES1!, NQ1! and RTY1! all end at a bar timestamped 2026-09-17 22:00 UTC, with no 2026-09-20 (Sunday) bar present. The only Sunday-futures-window artifact I attempted, CNBC's stock-futures-today-live-updates URL for 2026/09/20, returned HTTP 404 "Not Found". Sunday-evening Globex status and any Sunday futures percentage move are therefore UNVERIFIED — not "flat," not "higher," unknown.
• The most recent completed U.S. session as of 2026-09-20 was Friday, 2026-09-18 — confirmed independently by CNBC's live blog ("Updated Fri, Sep 18 2026 5:37 PM EDT") and by a 2026-09-20-dated market report that explicitly states it is "organized based on the closing prices of the New York market on the most recent trading day, Friday, September 18."
• Friday 2026-09-18 close: S&P 500 7,650.50, +0.17%; Dow 51,682.64, −0.18%; Nasdaq Composite 26,522.55, +0.39%; Nasdaq 100 29,644, +0.67%; Russell 2000 2,860.40, −0.50%; VIX 14.81, −4.08%. Dow posted its third straight losing week (−1.7%, worst since March).
• Two in-window drivers identified: (i) the aftermath of the Fed's first rate hike in over three years (Sept 16) with the 10-year yield back above 5%, and (ii) a Sunday, Sept 20 U.S.–China meeting (Treasury's Bessent and USTR Greer with Vice Premier He Lifeng at JPMorgan HQ in New York), plus escalating Middle East supply risk with crude near $100.
• I could not fully satisfy the "three gainers and three losers with percentage moves" requirement. The movers I found are named tickers without published daily percentages, and several third-party "movers" pages I surfaced are contradicted by the primary data (see §7).

2. Was there a regular U.S. session on Sunday 2026-09-20?

No regular session occurred on 2026-09-20 — but I must be explicit about how I know and what I could not verify.

…(truncated — the summary above captures the substance)

Round 0 · Finding 5

Executive Summary

There was NO regular U.S. equity trading session on Sunday, 2026-09-20. U.S. equity exchanges trade Monday–Friday, and the NYSE 2026 holiday calendar shows no holiday on or adjacent to that date (Labor Day 2026 was Monday, September 7) [https://www.nyse.com/trade/hours-calendars]. My finance-data pull independently confirms this: every index and ETF series I fetched ends at a last_bar of 2026-09-18, i.e. Friday, September 18, 2026 — the most recent completed regular session.

Therefore there is no "2026-09-20 performance" to report. All performance figures below are for the Friday, 2026-09-18 session, explicitly labeled as prior-session data.

In-window sourcing (pages published 2026-09-20) was thin: I found one dated 2026-09-20 market page, and its numeric fields are JavaScript-rendered and were not captured. This is stated as a gap rather than filled from memory.

1. Was there a session on 2026-09-20?

Conclusion: 2026-09-20 was a Sunday — markets closed, no regular session. Most recent regular session: Friday, 2026-09-18.

2. Index closing levels and returns — Friday 2026-09-18 session

All figures below are from finance_data action=analyze (1d interval, 250 bars), pulled on 2026-09-20. Session date for every figure: 2026-09-18.

…(truncated — the summary above captures the substance)

Round 0 · Finding 6

U.S. Equity Market — Status and Driver Research for Sunday, 2026-09-20

Bottom line: there was no U.S. equity regular-session performance on 2026-09-20. The date is a Sunday, and the most recent completed U.S. session in my pulled data is Friday, 2026-09-18. All price/level figures below are labeled by session date. I did not obtain a verified same-session biggest-movers list, and I explicitly decline to fabricate one.

1. Executive Summary

• 2026-09-20 was a Sunday — no regular U.S. equity session occurred. The NYSE's published 2026 holidays-and-trading-hours page (fetched) lists all 2026 market holidays and shows none on or around 2026-09-18/20; 2026 Labor Day was Monday, September 7, and the standard NYSE Core Trading Session is 9:30 a.m.–4:00 p.m. ET on trading days (https://www.nyse.com/trade/hours-calendars). Corroborating this directly: the last daily bar returned by finance_data action=analyze for SPY, QQQ, DIA and UUP is dated 2026-09-18 (last_bar: "2026-09-18 13:30:00"), i.e. no session data exists after Friday.
• Most recent completed session = Friday, 2026-09-18. Index quotes from finance_data action=quote (Yahoo source) and dated daily bars from finance_data action=analyze are the freshest figures available; they are prior-session (2026-09-18) data, not "today's" data.
• No 2026-09-20 index close, percentage move, or biggest-mover list can be reported, because no session occurred. Any source presenting a "September 20, 2026 close" is not describing a regular U.S. session.
• Cross-asset snapshot (latest available, 2026-09-18 session): ^VIX ≈ 14.81 (−4.08%), ^TNX ≈ 4.998% (+1.03%), DX-Y.NYB ≈ 100.215 (−0.02%) — all via finance_data action=quote (Yahoo), no date stamp supplied by the tool, so treat as "latest available," consistent with the 2026-09-18 close.
• In-window (2026-09-20) driver sources are thin. The only in-window, tool-verified items I could pull are overnight macro/geopolitical headlines dated 2026-09-20 (China LPR unchanged; PBOC liquidity injection; Moscow refinery drone strike). I found no in-window narrative article from a major outlet explaining Friday's index moves or Sunday futures direction. See §3.4.

2. Key Findings (with confidence levels)

…(truncated — the summary above captures the substance)

Investigation Trail

Round 0

• Did the NYSE, Nasdaq, and other major U.S. equity exchanges hold a regular trading session on Sunday, 2026-09-20, or were they closed due to weekend/holiday/emergency status? Check official exchange calendars and any market-status announcements published 2026-09-20..2026-09-20. Also check whether bond markets, futures markets, or Fedwire/ACH operated on that date.
• What were the closing levels and daily percentage changes for the S&P 500 (^GSPC), Nasdaq Composite (^IXIC), Dow Jones Industrial Average (^DJI), and Russell 2000 (^RUT) in the most recent U.S. regular trading session on or before 2026-09-20, as reported in sources published 2026-09-20..2026-09-20? Pull finance_data action=analyze for these index tickers and state the exact session date, 1-day, 5-day, and 20-day returns, and 52-week range position if available.
• What specific macroeconomic data releases, Federal Reserve communications, earnings reports, geopolitical events, or sector news were cited in sources published 2026-09-20..2026-09-20 as driving U.S. equity index moves, futures direction, or investor sentiment? Include reported levels for the CBOE Volatility Index (^VIX), the 10-year Treasury yield (^TNX), and the U.S. Dollar Index (DX-Y.NYB) if published that day.
• Which individual U.S.-listed stocks were the biggest percentage gainers and losers in the most recent completed U.S. trading session as of 2026-09-20, according to sources published 2026-09-20..2026-09-20? For each named ticker, pull finance_data action=analyze to verify price, 1-day/5-day/20-day percentage moves, RSI-14, and trend, and clearly flag any ticker whose data could not be fetched.
• How did the 11 S&P 500 sectors and key equity factors perform in the most recent U.S. session reported on 2026-09-20..2026-09-20, and which sectors led or lagged? Pull finance_data action=analyze for sector ETFs (XLK, XLF, XLE, XLV, XLI, XLP, XLY, XLU, XLB, XLRE, XLC) and state each sector's 1-day, 5-day, and 20-day returns where available.
• What were U.S. equity index futures (ES, NQ, YM, RTY) and global market cues doing during Sunday 2026-09-20 trading, and what did market commentary published 2026-09-20..2026-09-20 say about the setup for the next U.S. session? Note whether Sunday-evening futures trading had opened by the time of the source and include any reported percentage moves.

Sources

• https://www.nyse.com/markets/hours-calendars
• https://investomatica.com/is-stock-market-open
• https://investrade.com/market-review-september-18-2026/
• https://apnews.com/article/wall-street-stocks-dow-nasdaq-da0dbe004b6f83c36e7d1626a9741a92
• https://www.stocksignal24.com/blog/us-stock-market-closing-bell-2026-09-18
• https://stocksetups.com/movers/today
• https://www.cot-trading.com/market-movers
• https://www.ainvest.com/market/movers-monitor/sep-18-2026-sep-18-2026/
• https://www.financialjuice.com/News/9770683/Facility-at-Moscow-oil-refinery-damaged-in-ongoing-drone-assault-TASS-citing-Mayor-Sergey-Sobyanin.aspx?xy=rss
• https://www.financialjuice.com/News/9770612/China-sets-five-year-loan-prime-rate-at-350-unchanged-from-a-month-earlier.aspx?xy=rss
• https://www.financialjuice.com/News/9770621/China-central-bank-injects-32-billion-yuan-via-7-day-reverse-repos-at-140-vs-prior-140-statement.aspx?xy=rss
• https://www.financialjuice.com/News/9770544/US-Treasurys-Bessent-USTR-Greer-to-meet-Chinese-Vice-Premier-He-Lifeng-on-Sunday-at-JPMorgan-headquarters-in-New-York---source.aspx?xy=rss
• https://www.financialjuice.com/News/9770529/Yemens-Houthis-Attack-on-Aramco-facility-in-Yanbu.aspx?xy=rss
• https://www.wsj.com/livecoverage/stock-market-today-dow-sp-500-nasdaq-09-18-2026
• https://www.reuters.com/business/wall-st-week-ahead-investors-focus-rate-path-ai-slowdown-after-fed-hike-2026-09-18/
• https://apnews.com/article/wall-stre
• https://stockmarkethours.org/stock-market-holidays-2026
• https://www.regardsofwallstreet.com/tools/market-hours
• https://stockmarkethours.org/nyse-holidays-2026
• https://marketopentime.com/
• https://calendarhours.com/stock-market-hours/
• https://market-holiday.com/markets/nyse/holidays/2026
• https://wealthvieu.com/investing/stocks/stock-market-holidays/
• https://www.nyse.com/publicdocs/nyse/ICE_NYSE_2026_Yearly_Trading_Calendar.pdf
• https://www.investopedia.com/stock-market-today-dow-jones-s-and-p-500-09182026-12127251
• https://www.thestreet.com/stock-market-today/stock-market-today-dow-jones-sp-500-nasdaq-updates-sept-18-2026
• https://www.barrons.com/livecoverage/stock-market-news-today-091826
• https://vittarthi.com/markets/us
• https://www.marketwatch.com/livecoverage/stock-market-today-dow-s-p-500-nasdaq-oil-prices-rise-saudi-arabia-reportedly-up-capacity-pipeline
• https://www.zacks.com/stock/news/2991913/stock-market-news-for-sep-18-2026
• https://tradewithmaya.com/economiccalendar
• https://www.cnbc.com/2026/09/11/stock-market-next-week-outlook-for-sept-14-18-2026.html
• https://strongbuyanalytics.com/stock-market-outlook
• https://www.tipranks.com/calendars/economic
• https://seekingalpha.com/article/4945771-september-2026-trading-outlook-stock-market-bonds-fiscal-flows-and-interest-rates
• https://www.catacal.com/calendar
• https://www.schwab.com/learn/story/weekly-traders-outlook
• https://www.newyorkfed.org/research/calendars/nationalecon_cal
• https://alphabetastock.com/sp-500-september-open-10-year-yield-fed-september-2026/
• https://www.ainvest.com/market/movers-monitor/sep-18-2026-sep-18-2026/?page=1
• https://premarketprice.com/premarket-gainers/2026-09-18
• https://thedesperatetrader.com/biggest-gainers-today
• https://hdfcsky.com/news/top-gainers-losers-september18-2026-at-3-30-pm
• https://stocksetups.com/movers/premarket
• https://hdfcsky.com/news/top-gainers-losers-september-18-2026-at-12-pm
• https://www.money365.market/news/weekly-movers/2026-w38
• https://www.strasmore.com/blog/biggest-stock-movers-2026
• https://www.federalreserve.gov/paymentsystems/fedwire_hours.htm`
• https://www.nyse.com/trade/hours-calendars
• https://www.nyse.com/publicdocs/Trading_Days.pdf
• https://www.sifma.org/resources/general/holiday-schedule
• https://www.sifma.org/resources/guides-playbooks/holiday-schedule
• https://www.frbservices.org/about/holiday-schedules
• https://www.federalreserve.gov/aboutthefed/k8.htm
• https://www.cmegroup.com/tools-information/holiday-calendar.html
• https://www.federalreserve.gov/paymentsystems/fedwire_hours.htm
• https://www.nasdaq.com/market-activity/stock-market-holiday-calendar
• https://www.nyse.com/markets/hours-calendars?ecid=EMOWNSGCBUENRL03
• https://www.calendarlabs.com/nyse-market-holidays-2026/
• https://www.aistockselection.com/en/us-stock-market-holidays-2026/
• https://markethours.io/market-holidays/nyse/2026
• https://calendarhours.com/stock-market-holidays/
• https://primefinancelab.com/stock-market-holiday-2026/
• https://thestreetbrief.com/resources/stock-market-holidays
• https://www.tradinghours.com/open
• https://marketopentime.com/market-open
• https://publicholidayshub.com/stock-market-holidays/
• https://www.aistockselection.com/en/us-stock-market-holidays/
• https://worldtimedata.com/financial-time/stock-market-holidays-2026-full-nyse-and-nasdaq-closure-calendar/
• https://eskisignal.com/stock-market-holidays-2026/
• https://www.fool.com/coverage/stock-market-today/2026/09/18/stock-market-midday-sept-18-stocks-slip-crypto-gains/
• https://www.thedesperatetrader.com/after-hours-movers
• https://finquota.com/earning-calendar/
• https://www.cnbc.com/2026/09/10/stock-market-today-live-updates.html
• https://www.financecalendar.com/this-week/
• https://zenvesto.com/earnings-calendar
• https://en.wikipedia.org/wiki/September
• https://www.almanac.com/content/month-september-holidays-fun-facts-folklore
• https://www.thefactsite.com/september-facts/
• https://funworldfacts.com/facts-about-september/
• https://www.today.com/life/holidays/september-holidays-and-observances-rcna33296
• https://www.havefunwithhistory.com/facts-about-september/
• https://simple.wikipedia.org/wiki/September
• https://www.timeanddate.com/calendar/months/september.html
• https://www.cnbc.com/2026/09/17/stock-market-today-live-updates.html
• https://note.com/hirokimiyano/n/n67540a51265e?hl=en
• https://www.cnbc.com/2026/09/20/stock-futures-today-live-updates.html`
• https://www.financialjuice.com/News/9770683/
• https://www.financialjuice.com/News/9770621/
• https://www.financialjuice.com/News/9770612/
• https://www.financialjuice.com/News/9770544/
• https://www.financialjuice.com/News/9770529/
• https://www.cnbc.com/2026/09/13/stock-futures-today-live-updates.html
• https://nasdaqfutures.org/
• https://www.cnbc.com/markets/pre-markets/
• https://www.tipranks.com/markets/pre-market/gainers
• https://www.cmegroup.com/markets/equities/single-stock-futures
• https://liveindex.org/futures/
• https://markets.businessinsider.com/premarket?op=1
• https://www.sundaynightfutures.com/
• https://www.investing.com/indices/indices-futures
• https://www.impliedopen.com/
• https://www.impliedopen.com/instrument/s-and-p-500
• https://www.barchart.com/futures/quotes/ESU26
• https://www.wsj.com/market-data/quotes/futures/ESU26
• https://www.investing.com/indices/us-spx-500-futures-historical-data
• https://www.marketwatch.com/investing/future/esu26/charts
• https://www.capitalstreetfx.com/market-analysis/week-ahead-us-21-25-september/
• https://fedratecalc.com/us-economic-calendar/september-2026/
• https://www.whendomarketsopen.com/economic-calendar/
• https://www.kiplinger.com/investing/economy/this-weeks-economic-calendar
• https://funded.now/economic-calendar
• https://therighttrader.com/economic-calendar/this-week
• https://www.federalreserve.gov/data/releaseschedule.htm
• https://robinhood.com/us/en/prediction-markets/financial/events/sp-500-futures-price-on-september-21-2026-sep-21-2026/
• https://30rates.com/dow-jones
• https://polymarket.com/event/djia-up-or-down-on-september-21-2026
• https://www.investing.com/indices/us-30-futures-historical-data
• https://www.barchart.com/futures/quotes/YMU26
• https://30rates.com/dow-stock
• https://dowfutures.org/
• https://tradingstrategyguides.com/monday-futures-preview-september-14-2026-equity-futures-signal-weak-open/
• https://www.earningswhispers.com/calendar
• http://chartingwealth.com/market-compass-weekly-stocks-bonds-gold-bitcoin-forecast-monday-september-21-2026/
• https://tradingstrategyguides.com/monday-futures-preview-september-7-2026-metals-rally-signals-underlying-strength/
• https://www.investtech.com/main/market.php?MarketID=992&product=38
• https://www.cnn.com/markets/premarkets
• https://www.tradinghours.com/markets/jpx
• https://globalexchangeclock.com/market-hours/asia
• https://markethours.io/regions/asia
• https://www.capitalstreetfx.com/market-analysis/week-ahead-asia-21-25-september/
• https://www.forexchurch.com/stock-market-holidays
• https://market-clock.com/timelines/equities/asia_pacific/
• https://cn.investing.com/holidaycalendar/
• https://www.forexchurch.com/stock-market-holidays/tokyo-stock-exchange
• https://nikkei-express.com/
• https://www.cnbc.com/2026/09/03/stock-market-today-live-updates.html
• https://www.cnbc.com/2026/08/24/stock-market-today-live-updates.html
• https://www.cnbc.com/2026/07/26/stock-market-today-live-updates.html
• https://www.youtube.com/cnbctelevision/live
• https://www.cnbc.com/2026/06/15/stock-market-today-live-updates.html
• https://www.cmegroup.com/trading-hours.html
• https://crosstrade.io/blog/cme-trading-hours-2026
• https://investor.cmegroup.com/static-files/1047cbcc-7569-40ab-bb6b-6973eea07ea3
• https://www.metrotrade.com/cme-holiday-trading-hours/
• https://markethours.io/market-holidays/comex/2026
• https://www.discounttrading.com/futures-holiday-schedule.html
• https://tradetally.io/blog/cme-holiday-calendar/
• https://support.tradovate.com/s/article/2026-Holiday-Trading-Hours?language=en_US
• https://mrtopstep.com/calendars/cme-holidays
• https://damnpropfirms.com/trading-guides/cme-holiday-schedule/
• https://tickerdaily.com/article/stock-market-today-september-18-2026-sandp-500-closes-higher-on-fed-rate-pause-bets
• https://marketchameleon.com/Reports/MarketMovers
• https://www.marketbeat.com/pre-market-movers/
• https://www.trefis.com/stock/spy/articles/615802/market-movers-winners-sdgr-cyph-indp-losers-flnc-an-gbli/2026-09-18
• https://www.stocktitan.net/rankings/stock-gains-monthly/2026/september
• https://www.bloomberg.com/markets/stocks/futures
• https://finance.yahoo.com/markets/
• https://www.investopedia.com/terms/f/futures.asp
• https://www.tradingview.com/markets/futures/
• https://en.wikipedia.org/wiki/Futures_contract
• https://www.investing.com/charts/futures-charts
• https://www.tradingview.com/markets/futures/quotes-all/
• https://the-calendar.net/finance/stock-market-holidays-2026/
• https://bellhour.com/learn/stock-market-holidays-2026
• https://finance.yahoo.com/
• https://www.google.com/finance/
• https://www.cnn.com/markets
• https://www.marketwatch.com/
• https://stockx.com/?msockid=1cb2dc710c6862b5397ecbab0dc9639e
• https://stockanalysis.com/
• https://finance.yahoo.com/markets/stocks/most-active/
• https://www.investing.com/
• https://www.investing.com/equities
• https://www.msn.com/finance
• https://www.nyse.com/index
• https://www.nyse.com/quote
• https://en.m.wikipedia.org/wiki/New_York_Stock_Exchange
• https://markets.businessinsider.com/index/nyse-composite
• https://stockmarketwatch.com/exchanges/nyse/today
• https://finance.yahoo.com/quote/%5ENYA/
• https://www.nyse.com/listings_directory/stock
• https://www.nyse.com/trade/equities
• https://www.nyse.com/quote/index/DJI
• https://www.google.com/finance/quote/NYA:INDEXNYSEGIS
• https://en.m.wikipedia.org/wiki/Top
• https://www.vocabulary.com/dictionary/top
• https://tophat.com/
• https://en.m.wikipedia.org/wiki/.top
• https://www.billboard.com/charts/hot-100/
• https://www.facebook.com/marketplace/
• https://www.tradingview.com/markets/
• https://www.marketwatch.com/markets/us
• https://www.cnbc.com/markets/us-markets/?msockid=33d732f61ffa65c00a47252c1e2f64c1
• https://www.financialjuice.com/News/9770612/China-sets-five-year-loan-prime-rate-at-350-unchanged-from-a-month-earlier.aspx
• https://www.financialjuice.com/News/9770621/China-central-bank-injects-32-billion-yuan-via-7-day-reverse-repos-at-140-vs-prior-140-statement.aspx
• https://www.financialjuice.com/News/9770683/Facility-at-Moscow-oil-refinery-damaged-in-ongoing-drone-assault-TASS-citing-Mayor-Sergey-Sobyanin.aspx
• https://www.financialjuice.com/News/9770544/US-Treasurys-Bessent-USTR-Greer-to-meet-Chinese-Vice-Premier-He-Lifeng-on-Sunday-at-JPMorgan-headquarters-in-New-York---source.aspx
• https://stockmarketwatch.com/indices/dowjones/today
• https://www.cnbc.com/2026/09/09/stock-market-today-live-updates.html

Trace Index

Tool-call traces are persisted under /srv/swarm_web_runs/run-1789879247159-0001/finance_output/traces.