Stock Market Today: Chip Rout, Bank Earnings Leave S&P 500 Flat

A flat close that hid a lot of movement

The S&P 500 barely moved on Tuesday, October 13, but that calm finish came after a busy session. Three forces pulled against each other: a global sell-off in memory chips, the first big-bank reports of third-quarter earnings season, and an oil market still pricing war risk in the Gulf. The benchmark index slipped 0.02% to 7,805.45. The Nasdaq Composite lost 0.15% to 27,204.38, and the Dow Jones Industrial Average fell 180.45 points, or 0.35%, to 51,670.10.26 The Russell 2000 dropped 0.30%, so all four major U.S. indexes ended lower.22

The closing numbers agree across the major wraps. The intraday story was messier. Early on, the Dow climbed about 359 points, or 0.7%, while the S&P 500 and Nasdaq traded slightly lower.26 One live blog even reported the Dow's direction both ways during the day before settling on a lower close.21 Energy shares led the S&P 500's sector gains late in the session and briefly pushed the index into positive territory before it slipped back.24

The main point is that the market looks steady only on the surface. Chips sold off, banks disappointed, and the index still finished near a record. That suggests investors are rotating money between sectors rather than leaving stocks altogether. This week's inflation data shows how fragile that balance is.

Memory chips: a Chinese rival hits Seoul, then Wall Street

The biggest market-moving event started in Asia. Over the weekend, China's ChangXin Memory Technologies (CXMT) said it had made significant progress on a new chip design that packs more memory into less space. That revived fears of more competition for Micron, SK Hynix and Samsung Electronics.31 South Korea's Kospi fell as much as 7.4% during the day to 5,914.35, its lowest level since late July.34 It also triggered a trading curb on sell orders for the first time in nearly two months.35

Reports differ on where the Kospi closed. CNBC and a summary drawing on Korean financial press put the drop at 5.46%, with the index ending at 6,035.35.2638 Another account, citing Trading Economics, said it fell about 6.2% to 5,988.41.37 The direction and scale are not in doubt. SK Hynix fell 10.09% and Samsung 7.39%.38 Those two stocks make up more than half of the Korean market's total value, so a sector story became a story about the whole country.33

The selling reached the U.S. Micron fell 3.62% on Tuesday, and SanDisk, Seagate and Western Digital also declined.31 That came after a 3.9% drop on Monday.32 By one count, Tuesday was SK Hynix's eighth one-day drop of 10% or more in 2026. The stock now sits more than 50% below its June record, though it is still up sharply for the year.32

Analysts largely agree that the reaction was bigger than the immediate threat. One advisor at UBP said investors were jittery and looking for reasons to take profits on AI-related stocks. He added that Chinese memory makers still face technical hurdles, especially in high-bandwidth memory (HBM), the advanced chips used for AI.31 Another analyst said Korean firms still clearly dominate HBM.31 There were also other pressures. Samsung's share buyback program has ended and SK Hynix's ends this week, removing steady buying that had supported both stocks during earlier sell-offs.38 Broadcom CEO Hock Tan and investor Ray Dalio also raised concerns about froth in AI markets.32

In our reading, this was more about who keeps pricing power than about AI demand. Samsung had just guided to a record third-quarter operating profit, and Micron is coming off a record quarter.3837 Investors are not doubting that data centers need memory. They are starting to doubt that three companies will keep the pricing power that demand has given them. One analysis put it in exactly those terms.32

Banks open earnings season with mixed results

The banks did not provide the lift investors wanted. JPMorgan Chase missed third-quarter profit and revenue estimates but raised its 2026 guidance for net interest income, which is what banks earn from lending, and its shares fell 0.9%.26 Wells Fargo dropped 3% on mixed results. Goldman Sachs slipped 0.2% even though its revenue beat expectations.26 Bank stocks were already weak: one commentator noted that the KBW Nasdaq Bank Index had fallen 8.4% over three months while the S&P 500 rose more than 3%.22

The Dow's losses came from outside finance. Johnson & Johnson fell close to 6% after sales of $25.40 billion and adjusted earnings of $2.59 per share both came in just below forecasts. Caterpillar fell about 3.5%.24 Expectations for the season are high: analysts expect S&P 500 profits to have grown nearly 30% from a year earlier, according to FactSet.26 With targets that high, small misses get punished, which is what happened on Tuesday.

Oil: Russian diesel versus attacks in the Gulf

Crude traded between two opposing headlines. President Trump said Russia had agreed to supply diesel to global markets, and his administration temporarily lifted U.S. sanctions on Russian fuel. Lawmakers from both parties said the arrangement appears to conflict with U.S. law.12 On the other side, Houthi forces struck Riyadh's international airport over the weekend, and tanker attacks were reported near the Strait of Hormuz.12 Saudi Arabia intercepted more Houthi missiles and drones on Tuesday.20

Benchmark settlements show that split. Brent fell 96 cents to $105.69 a barrel, while West Texas Intermediate (WTI) rose 40 cents to $94.14.18 That came after three straight sessions of gains, as traders took profits.20 Intraday quotes from various outlets differed by more than a dollar, partly because they referenced different contract months. December Brent was quoted near $105.73 at one point, and the Brent–WTI gap was reported at roughly $13 to $14.1612

Goldman Sachs doubts the diesel deal will matter much. The bank estimated that an extra 800,000 metric tons of Russian diesel would cut wholesale prices on the U.S. Gulf Coast and in Europe by only $1 to $2 a barrel. It also noted that Russian refinery outages are up sharply from a year earlier.18 Demand signals are weakening as well: OPEC cut its 2026 demand-growth forecast to 400,000 barrels per day from 1.4 million.12 Still, crude is up more than 70% this year on Middle East supply disruptions.20 Brent near $106 keeps a geopolitical risk premium in prices that a softer demand outlook has not removed.

The Fed: oil feeds into inflation and raises the stakes

Oil prices matter most for the Federal Reserve, and Tuesday was the last session before that link became clear. The Fed raised rates by a quarter point in September to a target range of 3.75%–4.00%, its first increase in more than three years.4741 Minutes from that meeting showed that most officials expect another hike this year.50 New York Fed President John Williams said this week he saw one more increase as appropriate in 2026 but no further moves after that.42

The September consumer price index (CPI), released the next morning, changed expectations. Headline inflation rose to 3.7% from 3.4%, and core CPI, which excludes food and energy, reached 2.6%. Both came in above forecasts, with gasoline a main driver.47 The estimated chance of a hike at the October 27–28 meeting moved quickly, though reports put it at different levels. CME FedWatch went to 35% from 22%.45 Kalshi went to 33% from 16%.48 Reuters said interest-rate futures briefly priced roughly even odds.47 By the October 15 close, futures implied about 27%, with December still the more likely meeting for a hike.44 One outlet lists the meeting as October 28–29, while most coverage says October 27–28.5041

Our reading is that markets still expect a December move, and the spread in October odds reflects real uncertainty rather than conflicting reports. The New York Times noted that the October meeting comes just days before the midterm elections.42 Analysts quoted by Reuters pointed to weaker hiring as a reason the Fed could hold off.47 If oil stays above $100, though, broader price increases make waiting harder to defend.

Bitcoin: a spot-driven bounce without much support

Crypto moved with risk assets early, then went its own way. Bitcoin opened Tuesday at $81,754.48, down 2.3% from Monday, during what was described as a bloodbath in Asian stocks. It then recovered toward $84,000.2 Coverage noted that buyers purchasing bitcoin outright, known as spot buyers, led the rebound, while leveraged traders and ETF investors largely stayed out.2 A promotional release reported $109.8 million in net inflows to U.S. spot bitcoin ETFs that day, which conflicts with that picture.10 The more cautious account seems more reliable.

Bitcoin was trading at $83,408.20 around 7:45 a.m. Eastern, about 28% below its level a year earlier.1 It remains far under its October 2025 record of $128,198.07.2 By Thursday morning it had fallen back to roughly $80,745.28

The takeaway

Tuesday showed what this market looks like right now: crowded AI-chip trades are fragile, earnings expectations are high, oil prices reflect war risk, and the Fed's next step depends on whether energy costs keep spreading into broader inflation. The flat S&P 500 close concealed all of it. The next two weeks, through the FOMC meeting, will show whether investors can keep rotating between sectors or whether rate pressure finally hits the index as a whole.