Market Recap
12/18/25
SEQH CAPITAL RESEARCH
MARKET RECAP
RESEARCH DESK
18 December, 2025
U.S. equities snapped a four-day losing streak on Thursday, December 18, 2025, with a powerful rebound led by megacap tech and AI beneficiaries after cooler inflation data and blockbuster Micron earnings reignited the AI trade. The move marked a decisive risk‑on day, with growth and momentum reasserting leadership following several sessions of defensive rotation.
Index performance
The Nasdaq Composite led the rebound, climbing roughly 1.4% as AI, semiconductors, and broader tech rallied on Micron’s results and renewed optimism about the AI capex cycle.
The S&P 500 gained about 0.8%, putting it back on track after four straight declines and reflecting broad participation beyond just a handful of megacap names.
The Dow Jones Industrial Average added around 0.1%, lagging the growth-heavy Nasdaq but still participating in the recovery as investors digested the softer inflation read and easing rate concerns.
Macro drivers and Fed narrative
A cooler‑than‑expected November CPI print provided the macro catalyst for Thursday’s risk‑on tone. Headline CPI rose 2.7% year over year, while core inflation increased 2.6%, both below economists’ expectations of 3.0% and 3.1%, reinforcing the view that inflation pressures continue to ease toward the Federal Reserve’s target. This data bolstered the idea of a “Fed put” under the economy and risk assets, with commentary emphasizing that a central bank more worried about downside growth risks than runaway inflation is supportive for equities.
Lower bond yields on the back of the soft CPI print further supported duration‑sensitive assets, particularly high‑multiple growth and tech. The combination of easing inflation, less hawkish implied policy, and strong AI‑related earnings helped flip the narrative from recent concerns over valuation and factor crowding to renewed appetite for cyclicals and high-beta names.
Sector and factor moves
Tech and communication services were the standouts, with AI and semiconductor names ripping higher after Micron’s earnings and guidance signaled still‑robust demand for memory tied to AI workloads. Micron shares surged roughly 10%–11%, trading above 240 and pushing toward fresh highs, with intraday data showing the stock up over 23 points to around 248 as volumes more than doubled normal activity. This move helped pull the broader semiconductor complex and AI‑exposed megacaps higher, re‑energizing a trade that had been under pressure earlier in the week.
From a factor perspective, growth, momentum, and high beta outperformed, while defensives and low‑volatility factors lagged. The session also saw renewed interest in AI platforms and infrastructure beneficiaries, with flows favoring semis, hyperscale‑exposed names, and data‑center‑linked plays after being sold earlier in the week.
Notable single-name action
Micron Technology was the clear flagship story of the day. Shares jumped more than 10% following record revenue and operating income, along with guidance that suggested management is struggling to keep up with AI‑related demand for high‑bandwidth memory. The stock traded near 248–264 intraday, printing new 52‑week highs as investors extrapolated strong AI demand into 2026.
AI‑linked peers and large‑cap tech also participated. Nasdaq, Inc. gained just over 1%, reflecting broader optimism across market infrastructure and trading‑linked equities as volumes in growth and tech rebounded. AI software name C3.ai remained more subdued, trading down modestly on the day around the mid‑teens, highlighting ongoing selectivity in pure‑play AI software versus hardware beneficiaries. Elsewhere, a range of small‑ and mid‑cap biotech and specialty pharma names appeared on daily top‑gainers lists, underscoring the risk‑on tone in more speculative corners of the market.
Sentiment and positioning context
Thursday’s bounce followed a notable multi‑day drawdown that had knocked major indices below key technical levels and raised questions about the durability of the 2025 rally. The combination of soft inflation and a marquee AI earnings beat provided precisely the kind of macro‑micro alignment needed to trigger short‑covering and fresh long exposure in crowded growth trades. Live coverage flagged the session as a “reignition” of the AI theme, with Micron’s results framed as a proof point that AI infrastructure spending remains in full swing rather than rolling over.
For positioning, the day looks like a classic re‑risking session: investors rotated back into tech, semis, and AI after a brief but intense de‑risking period, while defensives and bond proxies underperformed on a relative basis. Into year‑end, this sets up a tug‑of‑war between profit‑taking in extended leaders and the renewed willingness to pay for secular AI growth against an improving inflation and policy backdrop