Market Summary
U.S. equities closed broadly lower on Monday, September 28, as a volatile session driven by surging crude oil prices and rising Treasury yields overwhelmed a midday attempt at recovery. The S&P 500 fell 59.72 points (-0.77%) to 7683.79, the Nasdaq Composite dropped 248.34 points (-0.92%) to 26841.42, and the Dow Jones Industrial Average declined 347.11 points (-0.67%) to 51481.42. All three indices finished near their session lows, though above the worst levels of the morning.
The primary catalyst was a breakdown in U.S.-Iran negotiations after President Trump rejected Iran’s conditional proposal to reopen the Strait of Hormuz, sending WTI crude surging more than 3% to above $95/bbl intraday and pushing the 10-year Treasury yield as high as 5.26%. A midday wave of more conciliatory headlines — including reports that President Trump was open to sanctions relief for nuclear deal progress — sparked a sharp reversal in crude, which settled up just 0.3% at $92.44/bbl, far below its morning peak. However, Treasury yields failed to retrace their advance, and equities were unable to sustain the bounce.
Sector rotation favored defensive positioning, with consumer staples, health care, and energy the only groups to finish higher, while communication services, consumer discretionary, financials, and industrials led the downside. Mega-cap and semiconductor weakness was a key overhang — Meta Platforms tumbled 4.79% and the PHLX Semiconductor Index fell 1.6% — offset partially by NVIDIA’s outperformance following its buyback increase. Breadth was decisively negative, and small- and mid-cap stocks underperformed, with both the Russell 2000 and S&P Mid Cap 400 down 0.7%.
Market Snapshot
| Index | Level | Change | % Change |
|—|—|—|—|
| Dow Jones Industrial Average | 51,481.42 | -347.11 | -0.67% |
| Nasdaq Composite | 26,841.42 | -248.34 | -0.92% |
| S&P 500 | 7,683.79 | -59.72 | -0.77% |
Advance/Decline (NYSE): 662 Advancers / 2,085 Decliners | Volume: 1.24 bln
Advance/Decline (Nasdaq): 1,389 Advancers / 3,537 Decliners | Volume: 7.08 bln
WaveFinder Breadth Metrics:
- Primary Sentiment: Very Bearish
- 4% Sentiment: Bearish
- 40 SMA Sentiment: Oversold
- Primary Bulls/Bears: 590 / 916
- 4% Bulls/Bears: 62 / 179
- Stocks Above 20-day SMA: 15%
- Stocks Above 40-day SMA: 18.06%
- 9-Month Bulls/Bears: 7 / 21
- 9-Month Bull Follow-Through: 0%
YTD Performance: Nasdaq +15.4% | Russell 2000 +13.5% | S&P 500 +12.2% | S&P Mid Cap 400 +9.6% | DJIA +7.1%
Sector Performance
1. Consumer Staples +0.4%
2. Health Care +0.3%
3. Energy +0.2%
4. Information Technology -0.7% (held up better than other growth areas on NVDA strength)
5. Industrials -1.0%
6. Financials -1.1%
7. Consumer Discretionary -1.6%
8. Communication Services -1.7%
9. Materials — lower (no specific % disclosed)
10. Utilities — lower (no specific % disclosed)
11. Real Estate — not reported in today’s data
Volatility context (WaveFinder ATR): Health Care (2.10%, rising, P74) and Technology (1.48%, rising, P95) showed elevated volatility readings, while Utilities (-4.58%) and Real Estate (-3.23%) registered the sharpest ATR declines.
Key Earnings & Movers
- NVIDIA (NVDA) +3.79 (+1.68%) to $228.86 — Announced a $150 billion increase to its share buyback authorization (total: $235 billion) and launched its Open Agent Safety Platform; offset broader semiconductor weakness.
- MongoDB (MDB) -75.76 (-18.46%) to $334.68 — President/CEO Chirantan “CJ” Desai stepped down effective immediately to take a senior role at Meta Platforms; former CEO Dev Ittycheria named interim president/CEO. Company reaffirmed Q3 and FY27 guidance ahead of its September 29 Investor Day.
- Meta Platforms (META) -36.04 (-4.79%) to $715.62 — Pulled back following last week’s double-digit advance; tied to the MDB CEO hire.
- NIKE (NKE) +0.62 (+1.73%) to $36.37 — Showed relative strength ahead of its fiscal Q1 report due Thursday afternoon; stock remains down ~43% YTD.
- Circle Internet Group (CRCL) — Traded lower after CFO Jeremy Fox-Geen announced plans to step down (through December 2026 pending a successor), overshadowing a new USDC integration partnership with Volante Technologies.
Stock Spotlight
NVIDIA (NVDA) was the standout large-cap performer, rising 1.68% to $228.86 even as broader technology and semiconductor names sold off. The company expanded its share repurchase authorization by $150 billion to a total of $235 billion, a move underscoring the extraordinary cash generation tied to the AI infrastructure buildout — NVDA produced nearly $69.9 billion in free cash flow in 1H FY27, with Q2 Data Center revenue surging 117% year-over-year to a record $89.0 billion (accelerating from 92% growth in Q1).
Alongside the buyback, NVDA launched its Open Agent Safety Platform, an open software framework designed to secure autonomous AI agents from testing through deployment. The initiative comes amid rising industry concern over agent-based security risks — including the recent Hugging Face breach involving OpenAI agents — and aligns with NVDA’s pending ~$12.9 billion acquisition of Hugging Face. Briefing.com’s analysis frames the dual announcement as reinforcing NVDA’s “full-stack” strategy, extending its footprint beyond compute hardware into the software and governance layer of AI deployment, potentially deepening its role across the AI stack as adoption expands.
Bond Market & Treasuries
Treasuries sold off sharply across the curve on Monday, pressured first by the spike in oil prices and then by persistent concerns over inflation and elevated debt issuance. Yields failed to fully retrace even as crude pared its gains late in the session.
Yield Changes (settle):
- 2-Year: +8 bps to 4.93%
- 3-Year: +8 bps to 5.01%
- 5-Year: +8 bps to 5.07%
- 10-Year: +9 bps to 5.25%
- 30-Year: +8 bps to 5.57%
The 10-year yield touched an intraday high of 5.26% before settling at 5.25%. Key drivers included President Trump’s rejection of Iran’s ceasefire proposal (WSJ), reports that talks between the U.S. and Iran remain ongoing but “far apart” (Axios), and conflicting signals — Alhadath reported Iran agreed to halt uranium enrichment in exchange for sanctions relief, while Bloomberg cited Iranian officials as pessimistic about a deal before the midterms. There was no U.S. economic data released Monday.
Commodities
- WTI Crude: $92.44/bbl, +0.3% (intraday high near $96.50/bbl before fading)
- Gold: $4,171.70/ozt, -3.4%
- Copper: $6.65/lb, -1.8%
- Silver: Not reported in today’s data
Currencies: EUR/USD -0.21% to 1.1367 | GBP/USD +0.1% to 1.3259 | USD/CNH -0.1% to 6.7126 | USD/JPY +0.1% to 157.40
Overseas Markets
Specific Asian and European index levels were not provided in today’s data set. Premarket commentary referenced overnight foreign exchange and oil-market activity tied to the U.S.-Iran situation, with Brent crude up as much as 3.0% to $100.42/bbl during the overnight session before easing alongside WTI. The U.S. dollar was mixed against major pairs, with EUR/USD softer (-0.21%) and USD/JPY modestly firmer (+0.1%) into the close.
Economic Data
No economic data of note was released on Monday, September 28.
Looking Ahead
Tuesday, September 29:
- 9:00 ET: July FHFA Housing Price Index (prior: 0.0%)
- 9:00 ET: July S&P Case-Shiller Home Price Index (prior: 2.1%)
- 10:00 ET: September Consumer Confidence (Briefing.com consensus: 90.0; prior: 89.4)
- 10:00 ET: August JOLTS – Job Openings (Briefing.com consensus: 7.150M; prior: 7.271M)
- 11:00 ET: Fed Governor Bowman remarks at community bank cyber workshop
- 12:40 ET: Fed Governor Barr speech on economic outlook
- 15:00 ET: Fed Governor Waller speech on payments
- MongoDB (MDB) Investor Day
Rest of the Week:
- Wednesday: August Personal Income and Spending report
- Thursday: September ISM Manufacturing Index; NIKE (NKE) fiscal Q1 earnings (after the close)
- Friday: September Employment Situation report
Markets will continue to monitor developments in U.S.-Iran diplomatic talks, which are expected to continue this week, along with any further movement in crude oil and Treasury yields.