The S&P 500 added 0.54% to 6,591.90 Wednesday as two distinct catalysts pushed the index higher: Trump publicly acknowledged the U.S. is in active negotiations with Iran, knocking WTI crude down 2.2%, and Arm Holdings unveiled its first in-house chip with a $15 billion revenue target, launching a semiconductor rally that lifted the Nasdaq Composite 0.77% to 21,929.83. ^[2] The Dow gained 0.66% to 46,429.49; the Russell 2000 added approximately 0.5%. ^[8] Ten of eleven S&P sectors closed higher. Energy was the only loser, which is precisely the point — what relieved the rest of the market pressured oil producers directly. ^[3]

What moved it

Trump told reporters from the Oval Office that the U.S. is "in negotiations right now" with Iran, stepping back from prior threats to strike Iranian energy infrastructure. The New York Times reported separately that the U.S. had delivered a 15-point peace framework to Tehran via Pakistan. ^[2] Iran's Foreign Ministry again denied direct talks — consistent with the pattern from Monday — but markets priced the diplomatic signal, not the denial. WTI fell to $90.32, Brent to roughly $102, and the relief mapped cleanly onto equity valuations: lower oil softens the inflation impulse, eases pressure on the Fed, and reduces the probability of the hike scenario that had been building in futures markets.

The Iran trade provided the macro floor. Arm Holdings provided something else: a fundamental catalyst with specific numbers attached. At an event in San Francisco, Arm CEO Rene Haas announced the company's first proprietary chip — the AGI CPU, built on TSMC's 3nm process with up to 136 cores — and projected it would generate $15 billion in annual revenue by fiscal 2031, roughly 6x Arm's 2025 base. Meta signed on as the first customer; OpenAI, Cloudflare, and SAP followed. ^[5] That announcement had nothing to do with Iran, which is what made the session's breadth credible: it wasn't purely a geopolitical relief rally. ^[1]

The 10-year Treasury yield pulled back to 4.35% from intraday highs above 4.40%, providing an additional tailwind for growth and rate-sensitive names. The VIX dropped to 25.56, still elevated above 20 — the geopolitical risk premium has not fully repriced, just partially relieved.

Sector scoreboard

Consumer discretionary (XLY) led at +1.27%, followed by technology (XLK) at +1.00% and materials (XLB) at +0.99%. ^[3] Financials (XLF) added +0.85%, communication services (XLC) +0.80%. The XLK and XLC gains are directly attributable to Arm's chip announcement and the sympathy rally it triggered across the semiconductor complex.

Energy (XLE) fell 1.11% — the only sector in the red — as the inverse relationship between the Iran-diplomacy trade and oil-levered equities played out exactly as it did Monday. Upstream producers are long crude prices; a 2.2% oil drop hits that exposure mechanically. ^[2]

Consumer staples (XLP) and health care (XLV) lagged the advance, each gaining less than 0.6% — consistent with defensive positioning unwinding, not accumulating.

Movers

Arm Holdings surged 16% after announcing its AGI CPU at a San Francisco event. The move represents both a product reveal and a business model pivot: for 35 years Arm has licensed chip designs to manufacturers; the AGI CPU marks its entry into direct chip sales. ^[1] HSBC issued a double upgrade to Buy with a $205 price target on the news. ^[5]

Intel gained more than 7% on two converging signals: the halo effect from Arm's announcement lifting CPU-sector sentiment broadly, and separate reports that both Intel and AMD are planning price hikes across CPU product lines beginning in March and April, driven by AI data center demand. ^[7] AMD gained between 6% and 7.5% on the same logic. ^[6] Neither company made a specific announcement; the moves reflect repricing of the AI infrastructure buildout narrative rather than company-specific news.

What to watch

Iran's diplomatic timeline. The five-day pause announced Monday expires around Friday or Saturday. Any Iranian rejection, continued Hormuz disruption, or Trump escalation rhetoric would likely reverse the relief trades quickly. Wednesday's negotiation signals are more substantive than Monday's — a 15-point framework is a document, not a tweet — but Iran's public stance remains non-cooperative.

Oil stabilization level. WTI at $90.32 is down from $98+ last week but still roughly 30% above pre-conflict levels. Where crude settles over the next few sessions determines whether the Fed's inflation calculus actually shifts or just pauses.

Fed rate path repricing. Odds of a 2026 rate hike remain around 17%, down from session highs. A sustained move in WTI toward the mid-$80s would begin shifting the futures strip — watch for any movement toward pricing in cuts that have been largely abandoned.

Gold's follow-through. Gold rebounded 3.3% Wednesday to $4,549 after a prolonged losing streak that briefly took it below $4,300 Monday. That bounce may signal the safe-haven unwind is losing momentum — or it may just be a positioning snapback. Direction Thursday will clarify which.

Thursday's earnings slate. Roughly 97 companies report Thursday, with no single name expected to be a tape-driver. The CCL quarterly report — Carnival Corporation, Q1 2026 — arrives Friday before the open. Analyst consensus is EPS of $0.18 and revenue of $6.14 billion; with shares down ~25% since late February on Iran-related itinerary disruptions, the guidance commentary will carry more weight than the headline numbers.