Stock market today: Dow, S&P 500, Nasdaq gains fizzle to cap week of sharp losses as AI fears grow

Market Overview - US stocks experienced a decline heading into the close on Friday, resulting in weekly losses for major indices, with the S&P 500 and Dow Jones Industrial Average posting losses of more than 1% and the Nasdaq falling over 2% [1] Inflation Data - Inflation cooled more than expected in January, with the Consumer Price Index indicating a 0.2% increase from the previous month and a 2.4% increase on an annual basis [2] Federal Reserve Expectations - The inflation report is likely to influence expectations regarding Federal Reserve policy, with traders increasing bets on a potential quarter-point rate cut in June, while most anticipate two cuts by the end of 2026 [3] Sector Performance - Concerns about AI disruption affected various sectors, including real estate, logistics, and transportation, leading to significant selling pressure, particularly in technology stocks, with all seven of the "Magnificent Seven" megacaps closing lower [4] Earnings Reports - Applied Materials (AMAT) saw its stock surge due to a positive outlook driven by strong AI demand, while Pinterest (PINS) shares fell after revenue missed expectations, raising concerns about AI risks to its platform [5] - Rivian (RIVN) shares increased by over 25% following a fourth-quarter earnings beat, with the company on track to deliver its R2 midsize model before summer [6] - Moderna (MRNA) shares rose 10% after exceeding quarterly revenue estimates, attributed to strong sales of its Covid vaccine [6]