Stock market today: Nasdaq, S&P 500 slide amid wave of earnings as tariffs bite GM profit

US equities closed mixed, but the S&P 500 achieved a new record high, underscoring market resilience despite mixed corporate earnings and persistent trade policy uncertainty. General Motors reported a significant 32% Q2 core profit decline and a $1.1 billion tariff impact, highlighting the direct financial consequences of trade tensions, while Northrop Grumman surged on a strong outlook. Investors are now keenly focused on upcoming "Magnificent Seven" tech earnings and critical trade developments, including a new US-Philippines deal and impending US-China discussions to avert further tariffs.

Analysis

The U.S. market is exhibiting a clear divergence, with the S&P 500 reaching a new record high of 6,309.62 while the Nasdaq Composite declined 0.4% amid pre-earnings caution. This mixed performance underscores significant underlying cross-currents. Corporate earnings are proving to be a key differentiator, as evidenced by Northrop Grumman's (NOC) over 9% share price increase following a raised full-year profit outlook, contrasted sharply with General Motors' (GM) stock decline after reporting a 32% drop in core profit. GM's results explicitly quantified a $1.1 billion negative impact from tariffs, signaling a material risk for industrials exposed to trade policy. Similarly, Lockheed Martin (LMT) shares fell 6% after a $1.6 billion charge, and NXP Semiconductors (NXPI) slid on a weak forecast. Investor focus is now intensely fixed on upcoming results from technology bellwethers Alphabet and Tesla, with high expectations for commentary to justify elevated valuations driven by the AI narrative. While a new U.S. trade deal with the Philippines offered a brief sentiment lift, uncertainty persists with crucial U.S.-China tariff deadlines approaching, making upcoming diplomatic talks a critical market catalyst.

Key Decisions for Investors

• Given the stark divergence in earnings, investors should prioritize individual company fundamentals over broad market trends, favoring firms with strong guidance like Northrop Grumman over those with significant tariff exposure like General Motors.
• The upcoming earnings from Alphabet, Tesla, and Amazon are pivotal; monitor these results closely for evidence of AI monetization and growth sustainability, as any disappointment could trigger significant valuation corrections in the tech sector.
• Maintain a cautious outlook on companies with complex global supply chains, as the $1.1 billion tariff impact on GM's earnings demonstrates that trade policy remains a tangible and significant financial risk.
• Recognize that non-fundamental factors are creating pockets of volatility, such as the retail-investor-driven surge in Kohl's, requiring careful risk management for positions outside of high-conviction, fundamentally-driven names.