Markets News, Aug. 4, 2026: S&P 500, Dow Close at Records as Palantir, Caterpillar Shares Jump; Oil Drops on US-Iran Deal Optimism
U.S. stocks rose to record closes, with the S&P 500 up 1.8% and the Dow up 1.7%. Palantir (PLTR) jumped about 30% after reporting better-than-expected results and raising its outlook, and Caterpillar (CAT) gained about 5.5% after earnings. Oil fell on U.S.-Iran deal optimism, with WTI down 5.8% to $75.70.
How this was made
The 30-second read
Why it matters
Traders can use the article’s same-day catalysts to manage event risk around earnings (PLTR, CAT, AMD, SPCX) and headline-driven operational risk (CMG), while treating the broader AI/semis rally as a flow-driven backdrop for ARM/MRVL/SNDK/NVDA.
Market read
Equities rallied to new highs while oil fell on US-Iran deal optimism, and several event-driven single stocks moved sharply on earnings and operational headlines.
What to watch
For Chipotle, the key swing factor is whether the outbreak is confined to the pulled lot or expands to other growers/retailers, which could change liability and demand expectations.
Background
The piece is a market wrap highlighting record US index closes alongside multiple single-name post-earnings and company-specific headlines, plus macro moves in oil, yields, and FX.
Ticker impact
Palantir reported better-than-expected results and lifted its outlook, sending shares up nearly 30% Tuesday.
Likely continued volatility and upward bias while the market digests the raised outlook.
The article attributes the ~30% jump directly to results and an outlook lift, which typically drives immediate re-rating and revisions.
Caterpillar shares surged about 5.5% after-hours/Tuesday on post-earnings strength, leading the Dow.
Near-term follow-through possible, but expect mean reversion risk after a single-day move.
The article confirms a sizable post-earnings jump but provides limited detail on the specific guidance or numbers for CAT.
AMD stock surged more than 7% ahead of quarterly results after the bell, with analysts expecting strong data-center demand.
If results confirm expectations, momentum could extend; if not, the move could reverse quickly.
The catalyst is earnings imminence and analyst expectations, but the article does not provide AMD’s actual reported figures yet.
SpaceX reported an adjusted EPS loss narrower than expected and revenue above estimates, but shares fell about 8% after-hours.
High volatility likely as traders reassess AI capex and segment losses versus the beat.
The article gives both the beat (EPS and revenue) and the immediate negative reaction, indicating a clear sentiment disconnect.
Chipotle shares dropped about 9% after it temporarily pulled jalapeños tied to a Salmonella outbreak in Minnesota.
Downward pressure likely until there is clarity on scope, ongoing cases, and any broader supply-chain impact.
The article links the specific outbreak-related product pull to a large same-day share decline and includes state case details.
ARM shares jumped between 11% and 17% as AI-tied stocks rallied alongside the Roundhill Memory ETF and SOXX.
Potential continuation with broader AI/semis, but expect sensitivity to any reversal in the group.
The article frames ARM’s move as part of a broader AI-tied rally, with no ARM-specific new fact beyond the price move.
Marvell Technology shares rose between 11% and 17% as AI-tied stocks rallied and semiconductor ETFs jumped.
Near-term follow-through depends on whether the broader AI/semis bid persists.
No MRVL-specific catalyst is described beyond being included in the AI-tied surge range.
SanDisk shares rose between 11% and 17% in the same AI-tied rally that lifted semiconductor ETFs.
Likely tracks the group’s momentum; idiosyncratic risk is unclear from this article.
The text provides no SNDK-specific news, only the magnitude of the rally within a basket.
Market effects
AI-tied semis and memory exposure (DRAM/SOXX) rallied sharply, reinforcing a momentum trade across the AI supply chain.
US equity strength at record levels supports broad risk appetite, likely spilling into global tech/industrial sentiment.
Oil weakness tied to US-Iran deal optimism can reduce inflation and energy-cost fears, supporting equities broadly.
Counterpoint
Some post-earnings beats (notably SpaceX) were sold, implying investors may be prioritizing capex intensity and segment losses over headline EPS/revenue.
Key entities
- US-listed stockPalantir Technologies
Reported better-than-expected results and lifted its outlook, driving a near-30% jump.
- US-listed stockCaterpillar
Shares rose about 5.5% on post-earnings strength.
- US-listed stockAdvanced Micro Devices
Shares surged ahead of quarterly results after the bell.
- US-listed stockSpaceX
Reported EPS and revenue beats but shares fell after-hours, suggesting investor focus on AI capex and losses.
- US-listed stockChipotle Mexican Grill
Temporarily pulled jalapeños tied to a Minnesota Salmonella outbreak; shares fell about 9%.
